• I am a Research Professor of Earth System Science in the Institute for the Study of Earth, Oceans, and Space, jointly appointed in the Dept. of Earth Sciences, and Faculty Chair of the interdisciplinary Natural Resources and Earth System Science PhD Program. I earned a B.S./M.S. in Physics from UNH, a Ph.D. in Earth Sciences/Biogeochemistry from UNH, and was a post-doc in NOAA’s Program in Climate and Global Change. My research focus is on the interaction between natural and/or managed terrestrial ecosystems and the climate system, in the context of climate and global change. I have active research in several areas within the broader field of Earth System Science: (1) peatland carbon balance and long-term carbon accumulation, including consequences of land use and permafrost thaw; (2) water resources and sustainability in the 21st century; (3) global land use, including carbon and nitrogen cycling in agroecosystems at regional to global scales; and (4) remote sensing analyses of global urban change. Research tools include ecosystem and hydrological modeling, remote sensing, and data analysis, and generally involve interdisciplinary collaborations.
  • Selected Publications

    Academic Article

    Year Title
    2021 The role of wetland expansion and successional processes in methane emissions from northern wetlands during the HoloceneQuaternary Science Reviews.  257:106864-106864. 2021
    2020 Modelling the habitat preference of two key Sphagnum species in a poor fen as controlled by capitulum water contentBiogeosciences.  17:5693-5719. 2020
    2020 Harmonization of global land use change and management for the period 850-2100 (LUH2) for CMIP6Geoscientific Model Development.  13:5425-5464. 2020
    2020 Global rules for translating land-use change (LUH2) to land-cover change for CMIP6 using GLM2Geoscientific Model Development.  13:3203-3220. 2020
    2020 Sensitivity of Deciduous Forest Phenology to Environmental Drivers: Implications for Climate Change Impacts Across North AmericaGeophysical Research Letters.  47. 2020
    2019 Publisher Correction: Tracking vegetation phenology across diverse biomes using Version 2.0 of the PhenoCam Dataset.Scientific data.  6:261. 2019
    2019 Tracking vegetation phenology across diverse biomes using Version 2.0 of the PhenoCam Dataset.Scientific data.  6:222. 2019
    2019 Impacts of drainage, restoration and warming on boreal wetland greenhouse gas fluxes.Science of the Total Environment.  647:169-181. 2019
    2019 Discovery and ecogenomic context of a global Caldiserica-related phylum active in thawing permafrost, Candidatus Cryosericota phylum nov., Ca. Cryosericia class nov., Ca. Cryosericales ord. nov., Ca. Cryosericaceae fam. nov., comprising the four species Cryosericum septentrionale gen. nov. sp. nov., Ca. C. hinesii sp. nov., Ca. C. odellii sp. nov., Ca. C. terrychapinii sp. nov.Systematic and Applied Microbiology.  42:54-66. 2019
    2019 Satellite Remote Sensing of Surface Urban Heat Islands: Progress, Challenges, and PerspectivesRemote Sensing.  11:48-48. 2019
    2019 Spring-season flooding is a primary control of vegetation succession trajectories in primary miresMires and Peat.  24. 2019
    2018 A radiative forcing analysis of tropical peatlands before and after their conversion to agricultural plantations.Global Change Biology.  24:5518-5533. 2018
    2018 Changes in Irrigation Practices Likely Mitigate Nitrous Oxide Emissions From California CroplandGlobal Biogeochemical Cycles.  32:1514-1527. 2018
    2018 Methanotrophy across a natural permafrost thaw environment.ISME Journal.  12:2544-2558. 2018
    2018 Mangrove carbon assessment tool: Model development and sensitivity analysisEstuarine, Coastal and Shelf Science.  208:23-35. 2018
    2018 Mangrove carbon assessment tool: Model validation and assessment of mangroves in southern USA and MexicoEstuarine, Coastal and Shelf Science.  208:107-117. 2018
    2018 21st-century modeled permafrost carbon emissions accelerated by abrupt thaw beneath lakes.Nature Communications.  9:3262. 2018
    2018 Genome-centric view of carbon processing in thawing permafrost.Nature Nature: New biology.  560:49-54. 2018
    2018 Host-linked soil viral ecology along a permafrost thaw gradient.Nature Microbiology.  3:870-880. 2018
    2018 Assessing Short-Term Impacts of Management Practices on N2O Emissions From Diverse Mediterranean Agricultural Ecosystems Using a Biogeochemical ModelJournal of Geophysical Research Biogeosciences.  123:1557-1571. 2018
    2018 Holocene peatland development and carbon stock of Zoige peatlands, Tibetan Plateau: a modeling approachJournal of Soils and Sediments.  18:2032-2043. 2018
    2018 Holocene peatland development and carbon stock of Zoige peatlands, Tibetan Plateau: a modeling approachJournal of Soils and Sediments.  18:2032-2043. 2018
    2018 Intercomparison of phenological transition dates derived from the PhenoCam Dataset V1.0 and MODIS satellite remote sensing.Scientific Reports.  8:5679. 2018
    2018 Tracking vegetation phenology across diverse North American biomes using PhenoCam imagery.Scientific data.  5:180028. 2018
    2017 Ancient Amazonian populations left lasting impacts on forest structureEcosphere.  8:e02035-e02035. 2017
    2017 Assessing the impacts of 1.5 degrees C global warming - simulation protocol of the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP2b)Geoscientific Model Development.  10:4321-4345. 2017
    2017 The shared and unique values of optical, fluorescence, thermal and microwave satellite data for estimating large-scale crop yieldsRemote Sensing of Environment.  199:333-349. 2017
    2017 Changes in the soil organic carbon balance on China's cropland during the last two decades of the 20th century.Scientific Reports.  7:7144. 2017
    2017 Microbial network, phylogenetic diversity and community membership in the active layer across a permafrost thaw gradient.Environmental Microbiology.  19:3201-3218. 2017
    2017 A probabilistic method of assessing carbon accumulation rate at Imnavait Creek Peatland, Arctic Long Term Ecological Research Station, AlaskaJournal of Quaternary Science.  32:579-586. 2017
    2017 Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cyclingJournal of Advances in Modeling Earth Systems.  9:1412-1430. 2017
    2017 The development of China-DNDC and review of its applications for sustaining Chinese agricultureEcological Modelling.  348:1-13. 2017
    2017 Denial of long-term issues with agriculture on tropical peatlands will have devastating consequences.Global Change Biology.  23:977-982. 2017
    2017 The use and re-use of unsustainable groundwater for irrigation: a global budgetEnvironmental Research Letters.  12:034017-034017. 2017
    2017 Greenhouse gas balance over thaw-freeze cycles in discontinuous zone permafrostJournal of Geophysical Research Biogeosciences.  122:387-404. 2017
    2017 A global view of shifting cultivation: Recent, current, and future extent.PLoS ONE.  12:e0184479. 2017
    2017 Evaluating multiple causes of persistent low microwave backscatter from Amazon forests after the 2005 drought.PLoS ONE.  12:e0183308. 2017
    2017 Impacts of land use, restoration, and climate change on tropical peat carbon stocks in the twenty-first century: implications for climate mitigation.Mitigation and Adaptation Strategies for Global Change.  22:1041-1061. 2017
    2016 Focus on the impact of climate change on wetland ecosystems and carbon dynamicsEnvironmental Research Letters.  11:100201-100201. 2016
    2016 Invisible water, visible impact: groundwater use and Indian agriculture under climate changeEnvironmental Research Letters.  11:084005-084005. 2016
    2016 Simulating carbon dioxide exchange in boreal ecosystems flooded by reservoirsEcological Modelling.  327:1-17. 2016
    2015 Modeling impacts of management on farmland soil carbon dynamics along a climate gradient in Northwest China during 1981-2000Ecological Modelling.  312:1-10. 2015
    2015 Modeling impacts of changes in temperature and water table on C gas fluxes in an Alaskan peatlandJournal of Geophysical Research Biogeosciences.  120:1279-1295. 2015
    2015 Global rain-fed, irrigated, and paddy croplands: A new high resolution map derived from remote sensing, crop inventories and climate dataITC Journal.  38:321-334. 2015
    2015 Corrigendum: Size and frequency of natural forest disturbances and the Amazon forest carbon balance.Nature Communications.  6:6638. 2015
    2015 Quantifying the link between crop production and mined groundwater irrigation in China.Science of the Total Environment.  511:161-175. 2015
    2015 Integration of palaeohydrological proxies into a peatland model: a new tool for palaeoecological studiesEcohydrology.  8:214-229. 2015
    2015 Satellite radar anisotropy observed in urban areasInternational Joural of Remote Sensing Remote Sensing Reviews.  36:665-679. 2015
    2015 Carbon accumulation of tropical peatlands over millennia: a modeling approach.Global Change Biology.  21:431-444. 2015
    2015 Greenness indices from digital cameras predict the timing and seasonal dynamics of canopy-scale photosynthesis.Ecological Applications.  25:99-115. 2015
    2014 Multi-year carbon dioxide flux simulations for mature Canadian black spruce forests and ombrotrophic bogs using Forest-DNDCBoreal Environment Research.  19:417-440. 2014
    2014 Direct human influence on atmospheric CO2 seasonality from increased cropland productivity.Nature Nature: New biology.  515:398-401. 2014
    2014 Data-driven diagnostics of terrestrial carbon dynamics over North AmericaAgricultural and Forest Meteorology.  197:142-157. 2014
    2014 Exploring the relationship between peatland net carbon balance and apparent carbon accumulation rate at century to millennial time scalesHolocene.  24:1167-1173. 2014
    2014 Mapping Asian Cropping Intensity With MODISIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.  7:3373-3379. 2014
    2014 Temperature and peat type control CO2 and CH4 production in Alaskan permafrost peats.Global Change Biology.  20:2674-2686. 2014
    2014 A shift of thermokarst lakes from carbon sources to sinks during the Holocene epoch.Nature Nature: New biology.  511:452-456. 2014
    2014 Size and frequency of natural forest disturbances and the Amazon forest carbon balance.Nature Communications.  5:3434. 2014
    2014 Mapping Crop Cycles in China Using MODIS-EVI Time SeriesRemote Sensing.  6:2473-2493. 2014
    2014 Assessing effects of permafrost thaw on C fluxes based on multiyear modeling across a permafrost thaw gradient at Stordalen, SwedenBiogeosciences.  11:4753-4770. 2014
    2014 Effect of Carex rostrata on seasonal and interannual variability in peatland methane emissionsJournal of Geophysical Research Biogeosciences.  119:24-34. 2014
    2013 A permafrost carbon bomb?Nature Climate Change.  3:865-867. 2013
    2013 CARBON STORAGE A permafrost carbon bomb?Nature Climate Change.  3:865-867. 2013
    2013 Beyond peak reservoir storage? A global estimate of declining water storage capacity in large reservoirsWater Resources Research.  49:5732-5739. 2013
    2013 Nitrogen cycling, forest canopy reflectance, and emergent properties of ecosystems.Proceedings of the National Academy of Sciences of the United States of America.  110:E2437. 2013
    2013 Climate sensitivity in the AnthropoceneQuarterly Journal of the Royal Meteorological Society.  139:1121-1131. 2013
    2013 Sobol' sensitivity analysis of the Holocene Peat Model: What drives carbon accumulation in peatlands?Journal of Geophysical Research Biogeosciences.  118:203-214. 2013
    2013 Assessing the role of parameter interactions in the sensitivity analysis of a model of peatland dynamicsEcological Modelling.  248:30-40. 2013
    2013 A global fingerprint of macro-scale changes in urban structure from 1999 to 2009Environmental Research Letters.  8:024004-024004. 2013
    2013 Evidence for elevated emissions from high-latitude wetlands contributing to high atmospheric CH4 concentration in the early HoloceneGlobal Biogeochemical Cycles.  27:131-140. 2013
    2013 Modelling the effects of climate change and disturbance on permafrost stability in northern organic soilsMires and Peat.  12. 2013
    2013 Wetland chronosequence as a model of peatland development: Vegetation succession, peat and carbon accumulationHolocene.  23:25-35. 2013
    2012 The resilience and functional role of moss in boreal and arctic ecosystems.New Phytologist.  196:49-67. 2012
    2012 Detection of Large-Scale Forest Canopy Change in Pan-Tropical Humid Forests 2000-2009 With the SeaWinds Ku-Band ScatterometerIEEE Transactions on Geoscience and Remote Sensing.  50:2603-2617. 2012
    2012 High Resolution Mapping of Peatland Hydroperiod at a High-Latitude Swedish MireRemote Sensing.  4:1974-1994. 2012
    2012 Spatiotemporal analysis of black spruce forest soils and implications for the fate of CJournal of Geophysical Research Biogeosciences.  117. 2012
    2011 Harmonization of land-use scenarios for the period 1500-2100: 600 years of global gridded annual land-use transitions, wood harvest, and resulting secondary landsClimatic Change.  109:117-161. 2011
    2011 Harmonization of land-use scenarios for the period 1500–2100: 600 years of global gridded annual land-use transitions, wood harvest, and resulting secondary landsClimatic Change.  109:117-161. 2011
    2011 Vulnerability of high-latitude soil organic carbon in North America to disturbanceJournal of Geophysical Research Biogeosciences.  116. 2011
    2011 High-frequency measurements of methane ebullition over a growing season at a temperate peatland siteGeophysical Research Letters.  38:n/a-n/a. 2011
    2011 Peatlands and Their Role in the Global Carbon CycleEos.  92:97-98. 2011
    2011 Tropical forest backscatter anomaly evident in Sea Winds scatterometer morning overpass data during 2005 drought in AmazoniaRemote Sensing of Environment.  115:897-907. 2011
    2011 Using ICESat's Geoscience Laser Altimeter System (GLAS) to assess large-scale forest disturbance caused by hurricane KatrinaRemote Sensing of Environment.  115:86-96. 2011
    2011 Peatlands in the Earth's 21st century climate systemEnvironmental Reviews.  19:371-396. 2011
    2011 Soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in North AmericaEarth System Dynamics.  2:121-138. 2011
    2010 Climate mitigation and the future of tropical landscapes.Proceedings of the National Academy of Sciences of the United States of America.  107:19633-19638. 2010
    2010 Interannual, seasonal, and diel variation in soil respiration relative to ecosystem respiration at a wetland to upland slope at Harvard ForestJournal of Geophysical Research Biogeosciences.  115:n/a-n/a. 2010
    2010 Storm intensity and old-growth forest disturbances in the Amazon regionGeophysical Research Letters.  37:n/a-n/a. 2010
    2010 The significance of local water resources captured in small reservoirs for crop production - A global-scale analysisJournal of Hydrology.  384:264-275. 2010
    2010 A new model of Holocene peatland net primary production, decomposition, water balance, and peat accumulationEarth System Dynamics.  1:1-21. 2010
    2010 McGill wetland model: evaluation of a peatland carbon simulator developed for global assessmentsBiogeosciences.  7:3517-3530. 2010
    2009 Forest disturbance and recovery: A general review in the context of spaceborne remote sensing of impacts on aboveground biomass and canopy structureJournal of Geophysical Research Biogeosciences.  114:n/a-n/a. 2009
    2009 Nitrogen-albedo relationship in forests remains robust and thought-provoking ReplyProceedings of the National Academy of Sciences of the United States of America.  106:E17-E17. 2009
    2009 The importance of Northern Peatlands in global carbon systems during the HoloceneClimate of the Past.  5:683-693. 2009
    2009 The importance of Northern Peatlands in global carbon systems during the Holocene. (vol 5, pg 683-693, 2009)Climate of the Past.  5:721-722. 2009
    2008 Global irrigation water demand: Variability and uncertainties arising from agricultural and climate data setsGeophysical Research Letters.  35. 2008
    2008 Canopy nitrogen, carbon assimilation, and albedo in temperate and boreal forests: Functional relations and potential climate feedbacks.Proceedings of the National Academy of Sciences of the United States of America.  105:19336-19341. 2008
    2008 Can we reconcile differences in estimates of carbon fluxes from land-use change and forestry for the 1990s?Atmospheric Chemistry and Physics.  8:3291-3310. 2008
    2007 On the evaluation of snow water equivalent estimates over the terrestrial Arctic drainage basinHydrological Processes.  21:1616-1623. 2007
    2007 Holocene radiative forcing impact of northern peatland carbon accumulation and methane emissionsGlobal Change Biology.  13:1079-1088. 2007
    2007 Holocene radiative forcing impact of northern peatland carbon accumulation and methane emissionsGlobal Change Biology.  13:1079-1088. 2007
    2007 Mapping and modelling of greenhouse gas emissions from rice paddies with satellite radar observations and the DNDC biogeochemical modelAquatic Conservation: Marine and Freshwater Ecosystems.  17:319-329. 2007
    2007 The tension between fire risk and carbon storage: evaluating US carbon and fire management strategies through ecosystem modelsEarth Interactions.  11. 2007
    2006 Evaluation of the SeaWinds scatterometer for regional monitoring of vegetation phenologyJournal of Geophysical Research.  111. 2006
    2006 Changes in moisture and energy fluxes due to agricultural land use and irrigation in the Indian Monsoon BeltGeophysical Research Letters.  33. 2006
    2006 The underpinnings of land-use history: three centuries of global gridded land-use transitions, wood-harvest activity, and resulting secondary landsGlobal Change Biology.  12:1208-1229. 2006
    2006 Evaluation of trends in derived snowfall and rainfall across Eurasia and linkages with discharge to the Arctic OceanGeophysical Research Letters.  33. 2006
    2006 Statistical uncertainty of eddy flux-based estimates of gross ecosystem carbon exchange at Howland Forest, MaineJournal of Geophysical Research.  111. 2006
    2006 How northern peatlands influence the Earth's radiative budget: Sustained methane emission versus sustained carbon sequestrationJournal of Geophysical Research Biogeosciences.  111. 2006
    2006 Field validation of DNDC model for methane and nitrous oxide emissions from rice-based production systems of indiaFertilizer Research Nutrient Cycling in Agroecosystems.  74:157-174. 2006
    2006 Mapping paddy rice agriculture in South and Southeast Asia using multi-temporal MODIS imagesRemote Sensing of Environment.  100:95-113. 2006
    2006 Effects of uncertainty in climate inputs on simulated evapotranspiration and runoff in the Western ArcticEarth Interactions.  10. 2006
    2006 New district-level maps of rice cropping in India: A foundation for scientific input into policy assessmentField Crops Research.  98:164-177. 2006
    2005 Modelling of methane emissions from rice-based production systems in India with the denitrification and decomposition model: Field validation and sensitivity analysisCurrent Science.  89:1904-1912. 2005
    2005 Interannual variability in North American grassland biomass/productivity detected by SeaWinds scatterometer backscatterGeophysical Research Letters.  32. 2005
    2005 Remote sensing of snow thaw at the pan-Arctic scale using the SeaWinds scatterometerJournal of Hydrology.  312:294-311. 2005
    2005 Carbon sequestration in arable soils is likely to increase nitrous oxide emissions, offsetting reductions in climate radiative forcingClimatic Change.  72:321-338. 2005
    2005 Ecosystem respiration in a cool temperate bog depends on peat temperature but not water tableEcosystems.  8:619-629. 2005
    2005 Modeling impacts of farming management alternatives on CO2, CH4, and N2O emissions: A case study for water management of rice agriculture of ChinaGlobal Biogeochemical Cycles.  19. 2005
    2005 Mapping paddy rice agriculture in southern China using multi-temporal MODIS imagesRemote Sensing of Environment.  95:480-492. 2005
    2005 Satellite-based modeling of gross primary production in a seasonally moist tropical evergreen forestRemote Sensing of Environment.  94:105-122. 2005
    2004 A major regional air pollution event in the northeastern United States caused by extensive forest fires in Quebec, CanadaJournal of Geophysical Research.  109:D19305 1-16. 2004
    2004 Short- and long-term greenhouse gas and radiative forcing impacts of changing water management in Asian rice paddiesGlobal Change Biology.  10:1180-1196. 2004
    2004 Trends in rice-wheat area in ChinaField Crops Research.  87:89-95. 2004
    2004 Satellite radar remote sensing of seasonal growing seasons for boreal and subalpine evergreen forestsRemote Sensing of Environment.  90:243-258. 2004
    2004 Radar remote sensing of the spring thaw transition across a boreal landscapeRemote Sensing of Environment.  89:163-175. 2004
    2003 A multivariable approach for mapping sub-pixel land cover distributions using MISR and MODIS: Application in the Brazilian Amazon regionRemote Sensing of Environment.  87:243-256. 2003
    2003 Simulating pan-Arctic runoff with a macro-scale terrestrial water balance modelHydrological Processes.  17:2521-2539. 2003
    2003 Uncertainties in estimates of cropland area in China: a comparison between an AVHRR-derived dataset and a Landsat TM-derived datasetGlobal and Planetary Change.  37:297-306. 2003
    2003 Peatland responses to varying interannual moisture conditions as measured by automatic CO2 chambersGlobal Biogeochemical Cycles.  17:n/a-n/a. 2003
    2003 Mapping Single‐, Double‐, and Triple‐crop Agriculture in China at 0.5° × 0.5° by Combining County‐scale Census Data with a Remote Sensing‐derived Land Cover MapGeocarto International.  18:3-13. 2003
    2003 Interannual variability in the peatland-atmosphere carbon dioxide exchange at an ombrotrophic bogGlobal Biogeochemical Cycles.  17:n/a-n/a. 2003
    2003 Modeling soil organic carbon change in croplands of ChinaEcological Applications.  13:327-336. 2003
    2003 The perimeter/area ratio as an index of misregistration bias in land cover change estimatesInternational Joural of Remote Sensing Remote Sensing Reviews.  24:1165-1170. 2003
    2003 Sensitivity of vegetation indices to atmospheric aerosols: continental-scale observations in Northern AsiaRemote Sensing of Environment.  84:385-392. 2003
    2002 Detecting and predicting spatial and interannual patterns of temperate forest springtime phenology in the eastern USGeophysical Research Letters.  29:54-1-54-4. 2002
    2002 Reduced methane emissions from large-scale changes in water management of China's rice paddies during 1980-2000Geophysical Research Letters.  29:33-1-33-4. 2002
    2002 Landscape-scale characterization of cropland in China using Vegetation and landsat TM imagesInternational Joural of Remote Sensing Remote Sensing Reviews.  23:3579-3594. 2002
    2002 Quantitative relationships between field-measured leaf area index and vegetation index derived from VEGETATION images for paddy rice fieldsInternational Joural of Remote Sensing Remote Sensing Reviews.  23:3595-3604. 2002
    2002 Observation of flooding and rice transplanting of paddy rice fields at the site to landscape scales in China using VEGETATION sensor dataInternational Joural of Remote Sensing Remote Sensing Reviews.  23:3009-3022. 2002
    2002 Evaluating TERRA-1 MODIS data for discrimination of tropical secondary forest regeneration stages in the Brazilian Legal AmazonGeophysical Research Letters.  29:42-1-42-4. 2002
    2002 Plant biomass and production and CO2 exchange in an ombrotrophic bogJournal of Ecology.  90:25-36. 2002
    2002 Combining remote sensing and ground census data to develop new maps of the distribution of rice agriculture in ChinaGlobal Biogeochemical Cycles.  16:38-1-38-10. 2002
    2002 Determination of subpixel fractions of nonforested area in the Amazon using multiresolution satellite sensor dataJournal of Geophysical Research.  107:lba 16-1-lba 16-11. 2002
    2002 Modeling seasonal to annual carbon balance of Mer Bleue Bog, Ontario, CanadaGlobal Biogeochemical Cycles.  16:4-1-4-21. 2002
    2001 Boreal forest CO2 exchange and evapotranspiration predicted by nine ecosystem process models: Intermodel comparisons and relationships to field measurementsJournal of Geophysical Research.  106:33623-33648. 2001
    2001 Comparison of boreal ecosystem model sensitivity to variability in climate and forest site parametersJournal of Geophysical Research.  106:33671-33687. 2001
    2001 Linking remote-sensing estimates of land cover and census statistics on land use to produce maps of land use of the conterminous United StatesGlobal Biogeochemical Cycles.  15:673-685. 2001
    2001 Modeling northern peatland decomposition and peat accumulationEcosystems.  4:479-498. 2001
    2001 N(2)O emissions from humid tropical agricultural soils: effects of soil moisture, texture and nitrogen availabilitySoil Biology and Biochemistry.  33:1077-1093. 2001
    2001 Application of the NASA scatterometer (NSCAT) for determining the daily frozen and nonfrozen landscape of AlaskaRemote Sensing of Environment.  75:113-126. 2001
    2001 Comparing a process-based agro-ecosystem model to the IPCC methodology for developing a national inventory of N2O emissions from arable lands in ChinaFertilizer Research Nutrient Cycling in Agroecosystems.  60:159-175. 2001
    1999 Net ecosystem productivity and its uncertainty in a diverse boreal peatlandJournal of Geophysical Research.  104:27683-27692. 1999
    1999 Using the space-borne NASA scatterometer (NSCAT) to determine the frozen and thawed seasonsJournal of Geophysical Research.  104:27895-27907. 1999
    1999 Agricultural land-use in China: a comparison of area estimates from ground-based census and satellite-borne remote sensingGlobal Ecology and Biogeography.  8:407-416. 1999
    1999 Radar remote sensing proposed for monitoring freeze-thaw transitions in boreal regionsEos.  80:213-221. 1999
    1998 Comparison of N2O emissions from soils at three temperate agricultural sites: simulations of year-round measurements by four modelsFertilizer Research Nutrient Cycling in Agroecosystems.  52:77-105. 1998
    1998 Relationship between ecosystem productivity and photosynthetically active radiation for northern peatlandsGlobal Biogeochemical Cycles.  12:115-126. 1998
    1997 Sensitivity of spruce/moss boreal forest net ecosystem productivity to seasonal anomalies in weatherJournal of Geophysical Research.  102:29053-29064. 1997
    1997 A comparison of the performance of nine soil organic matter models using datasets from seven long-term experimentsGeoderma.  81:153-225. 1997
    1997 Simulating trends in soil organic carbon in long-term experiments using the DNDC modelGeoderma.  81:45-60. 1997
    1996 Modelling temporal variability in the carbon balance of a spruce/moss boreal forestGlobal Change Biology.  2:343-366. 1996
    1994 MODELING CARBON BIOGEOCHEMISTRY IN AGRICULTURAL SOILSGlobal Biogeochemical Cycles.  8:237-254. 1994
    1994 MODELING NITROUS-OXIDE EMISSIONS FROM AGRICULTURE - A FLORIDA CASE-STUDYChemosphere Chemosphere - Global Change Science.  28:1401-1415. 1994
    1981 EXPERIMENTAL POTENTIAL CURVES FOR THE X-2-SIGMA+ AND A-2-PI STATES OF NANEBulletin- American Physical Society.  26:596-596. 1981
    1981 EXPERIMENTALLY DETERMINED POTENTIAL CURVES FOR THE X2-SIGMA-(+) AND A2-PI STATES OF NANEPhysical Review A - Atomic, Molecular, and Optical Physics.  24:3105-3110. 1981
    1980 EXPERIMENTAL POTENTIALS FOR THE X-2-SIGMA+ AND A-2-II STATES OF NAHEPhysical Review Letters.  45:1783-1786. 1980


    Year Title
    2017 Achieving sustainable irrigation water withdrawals: global impacts on food security and land useEnvironmental Research Letters.  104009-104009. 2017


    Year Title
    2012 A Review of Above Ground Necromass in Tropical Forests.  215-252. 2012
    2009 Issues Related to Incorporating Northern Peatlands Into Global Climate ModelsGeophysical Monograph Series. 19-35. 2009

    Conference Paper

    Year Title
    2010 The First-Order Effect of Holocene Northern Peatlands on Global Carbon Cycle DynamicsIOP Conference Series: Earth and Environmental Science. 012004-012004. 2010

    Principal Investigator On

  • Collaborative Proposal: RUI: MSB-FRA: Peat Expansion in Arctic Tundra - Pattern, Process, and the Implication for the Carbon Cycle in a Changing Climate (TundraPEAT)  awarded by National Science Foundation (NSF) 2018 - 2023
  • Collaborative Research: Sea-Level Rise, Coastal Wetland Expansion, and Proglacial Lake Contributions  awarded by National Science Foundation (NSF) 2019 - 2022
  • Collaborative Research: MSB-FRA: Improved Understanding of Feedbacks Between Ecosystem Phenology and the Weather-Climate Nexus at Local-to-Continental Scales  awarded by National Science Foundation (NSF) 2017 - 2022
  • Interdisciplinary Research with Data from SeaWinds on QuikSCAT and Other Scatterometers: Assessing Patterns and Rates of Global Urban Growth  awarded by National Aeronautics and Space Administration (NASA) 2018 - 2022
  • Dynamics and Modeling of Greenhouse Gas Emissions from Grasslands and Croplands Under Changing Microbes, Climate, Livestock Grazing and Manure Application  awarded by University of Oklahoma 2016 - 2022
  • Sustainable Wetlands Adaptation and Mitigation Program (SWAMP)  awarded by CIFOR Center for Intl Forestry Research 2020 - 2021
  • Quantification of Land-Use, Land Cover Change as Critical Driver of Earth System Dynamics  awarded by University of Maryland 2015 - 2019
  • Pathways to Carbon Liberation: A Systems Approach to Understanding Carbon Transformations and Losses from Thawing Permafrost  awarded by University of Arizona 2013 - 2018
  • Incorporating a New Urban Dataset from SeaWinds into a Multi-Sensor Analysis of Global Daytime and Nighttime Urban Heat Islands  awarded by National Aeronautics and Space Administration (NASA) 2014 - 2018
  • Identifying Ways to Reduce Agricultural GHG Emissions: A Multinational Modeling Approach to Optimize C and N Cycles Between Livestock and Cropping Systems  awarded by US DA, Department of Agriculture 2014 - 2017
  • RUI: Ecosystem Responses to Atmospheric N Deposition in an Ombrotrophic Bog: Vegetation and Microclimate Feedbacks Lead to Stronger C Sink or Source?  awarded by Mt. Holyoke College 2011 - 2017
  • Integrated Assessment Model Development, Comparison, and Diagnostics Project  awarded by Pennsylvania State University 2013 - 2017
  • Incorporating USGS Web Cameras into the Phenocam Network to Enhance Scientific Understanding of Phenological Trends and Variability  awarded by US DOI, US Geological Survey 2016 - 2017
  • Collaborative Research: Continental-scale Monitoring, Modeling and Forecasting of Phenological Responses to Climate Change  awarded by National Science Foundation (NSF) 2011 - 2017
  • Understanding Coupling between Biogeochemical Cycling and Climate Change in Northern Ecosystems: Historical Analysis and Future Projections with the GFDL Earth System Model  awarded by Princeton University 2011 - 2016
  • WSC - Category 3: Crops, Climate, Canals, and the Cryosphere in Asia - Changing Water Resources around the Earth's Third Pole  awarded by National Science Foundation (NSF) 2010 - 2015
  • Developing a Model of the Carbon Balance of Tropical Peatlands under Pressures from Land Use and Climate Change  awarded by US DA, Department of Agriculture 2010 - 2015
  • Long-Term Carbon Storage Shifts in High-Latitude, Carbon-Rich Soils with Paleoclimate Change: Linking Mechanistic Peatland Modeling with Paleoecologic and Palechydrologic Reconstructions  awarded by National Science Foundation (NSF) 2010 - 2014
  • Modeling the Impacts of Major Forest Disturbances on the Earth System  awarded by University of Maryland 2010 - 2014
  • Quantifying Glacier-Fjord-Ocean Interactions and their Impact on Changing Ice Discharge: Kangia Nunata Sermia and Other Outlets, West Greenland  awarded by National Science Foundation (NSF) 2009 - 2013
  • Mass Transit: Controls on Grounding and Ungrounding at Marine Ice Sheet Outlets  awarded by National Science Foundation (NSF) 2009 - 2013
  • Identifying Hydroclimate Regimes of Carbon Stability in Northern Peatlands: Holocene Data Analysis and Process-Based Modeling  awarded by National Science Foundation (NSF) 2006 - 2012
  • Imaging Impacts of Seasonal Water Stress on Vegetation at Basin to Regional Scales: Combining Optical and Microwave Remote Sensing with Hydrological Measurements to Understand Change  awarded by National Aeronautics and Space Administration (NASA) 2008 - 2011
  • The History of Agricultural Irrigation Expanison: Developing useful Datasets of Global Irrigated Area and Irrigation Water use from Remote Sensing and Hydrologic Modeling  awarded by National Aeronautics and Space Administration (NASA) 2007 - 2010
  • Advancing our Understanding of the Earth System Through Coupled Carbon-Climate Modeling and Observations  awarded by National Aeronautics and Space Administration (NASA) 2007 - 2010
  • Texas Commission on Environmental Quality Contract - Purchases Impact Estimator  awarded by Texas Commission on Enviromental Quality 2007 - 2008
  • On-Line Tool for Environmentally Preferable Purchasing  awarded by Texas Commission on Enviromental Quality 2005 - 2006
  • Validation of the DNDC Model Using California Field Data  awarded by Applied GeoSolutions LLC 2005
  • Microwave Remote Sensing Measure High Latitude Grow Season  awarded by University of Montana 2001 - 2005
  • Ecosystems Carbon Balance of Northeastern Forests  awarded by Harvard University 1997 - 2000
  • Scaling Peatland CO2 & CH4 Fluxes from Chambers to BOREAS  awarded by National Aeronautics and Space Administration (NASA) 1997 - 2000
  • Monitoring Global Change Responses of Vegetation  awarded by National Aeronautics and Space Administration (NASA) 1996 - 2000
  • Trace Gas Cross-Site Comparison - TRAGNET  awarded by Colorado State University 1995 - 1996
  • Teaching Activities

  • Doctoral Research Taught course 2021
  • Top/Biogeochemistry Taught course 2021
  • Doctoral Research Taught course 2020
  • Interdisciplinary Research Taught course 2020
  • Doctoral Research Taught course 2020
  • Doctoral Research Taught course 2019
  • Interdisciplinary Research Taught course 2019
  • Doctoral Research Taught course 2019
  • Top/Biogeochemistry Taught course 2019
  • Doctoral Research Taught course 2018
  • Interdisciplinary Research Taught course 2018
  • Doctoral Research Taught course 2018
  • Doctoral Research Taught course 2017
  • Interdisciplinary Research Taught course 2017
  • Doctoral Research Taught course 2017
  • Doctoral Research Taught course 2016
  • Interdisciplinary Research Taught course 2016
  • Doctoral Research Taught course 2016
  • Top/Biogeochemistry Taught course 2016
  • Interdisciplinary Research Taught course 2015
  • Biogeochemistry Taught course 2014
  • Education And Training

  • B.S. Physics, University of New Hampshire
  • M.S. Physics, University of New Hampshire
  • Ph.D. Earth Sciences, University of New Hampshire
  • Full Name

  • Stephen Frolking