93 Works

Ecosystem Functional Type Distribution Map for the Conterminous USA, 2001-2014

S. VILLARREAL, R. VARGAS & D. ALCARAZ-SEGURA
This dataset provides maps of the distribution of ecosystem functional types (EFTs) and the interannual variability of EFTs at 0.05 degree resolution across the conterminous United States (CONUS) for 2001 to 2014. EFTs are groupings of ecosystems based on their similar ecosystem functioning that are used to represent the spatial patterns and temporal variability of key ecosystem functional traits without prior knowledge of vegetation type or canopy architecture. Sixty-four EFTs were derived from the metrics...

ATom: L2 In Situ Measurements from NOAA Nitrogen Oxides and Ozone (NOyO3) Instrument

T.B. RYERSON, C.R. THOMPSON, J. PEISCHL & I. BOURGEOIS
This dataset provides in situ concentrations of nitric oxide (NO), nitrogen dioxide (NO2), total reactive nitrogen oxides (NOy), and ozone (O3) measured by the NOAA Nitrogen Oxides and Ozone (NOyO3) 4-channel chemiluminescence (CL) instrument during airborne campaigns conducted by NASA's Atmospheric Tomography (ATom) mission. NOyO3 provides fast-response, specific, high precision, and calibrated measurements of nitrogen oxides and ozone at a spatial resolution of better than 100 m. ATom deploys an extensive gas and aerosol payload...

ABoVE: Landsat-derived Annual Dominant Land Cover Across ABoVE Core Domain, 1984-2014

J.A. WANG, D. SULLA-MENASHE, C.E. WOODCOCK, O. SONNENTAG, R.F. KEELING & M.A. FRIEDL
This dataset provides two 30-m resolution time series products of annual land cover classifications over the Arctic Boreal Vulnerability Experiment (ABoVE) core domain for each year of the period 1984-2014. The data are the annual dominant plant functional type in a given 30-meter pixel derived from time series of Landsat surface reflectance, landcover training data mapped across the ABoVE domain using Random Forests modeling, with clustering and interpretation of field photography and very high resolution...

Forest Carbon Stocks and Fluxes After Disturbance, Southeastern USA, 1990-2010

H. GU, C.A. WILLIAMS, N. HASLER & Y. ZHOU
This dataset provides estimates of forest carbon stocks and fluxes in the form of aboveground woody biomass (AGB) and net ecosystem productivity (NEP), as a function of the number of years since the most recent disturbance (i.e., stand age) for forests in the southeastern USA at a 30 m resolution for the benchmark years 1990, 2000, and 2010. The study area includes: Virginia, North Carolina, South Carolina, Georgia, and Florida. Estimates were derived from an...

ABoVE: Post-Fire and Unburned Vegetation Community and Field Data, NWT, Canada, 2018

L.L. BOURGEAU-CHAVEZ, N.H.F. FRENCH, S. ENDRES, L. JENKINS, M. BATTAGLIA, E. SEROCKI & M. BILLMIRE
This dataset provides vegetation community characteristics and biophysical data collected in 2018 from areas that were burned by wildfire in 2014 and 2015, and from nine unburned validation sites in the Northwest Territories, Canada. The data include vegetation inventories, ground cover, regrowth, tree diameter and height, and woody seedling/sprouting data at burned sites, and similar vegetation community characterization at unburned validation sites. Additional measurements included soil moisture, collected for validation of the UAVSAR airborne collection,...

Gridded Winter Soil CO2 Flux Estimates for pan-Arctic and Boreal Regions, 2003-2100

J.D. WATTS, S. NATALI, S. POTTER & B.M. ROGERS
This dataset provides gridded estimates of soil CO2 flux (g C m-2 d-1) for the winter non-growing season (NGS) across pan-Arctic and Boreal permafrost regions (>49 Deg N), at 25 km spatial resolution. The data are the daily average flux over a monthly period for two climate periods: the baseline climate period represents 2003-2018 and the future climate scenarios period represents 2018-2100 under Representative Concentration Pathways (RCP) 4.5 and 8.5. The data were produced by...

Annual Burned Area from Landsat, Mawas, Central Kalimantan, Indonesia, 1997-2015

Y. Vetrita & M.A. Cochrane
This dataset provides maps of annual burned area for the part of Mawas conservation program in Central Kalimantan, Indonesia from 1997 through 2015. Landsat imagery (TM, ETM+, OLI/TIR) at 30 m resolution was obtained for this 19-year period, including the variables surface reflectance, brightness temperature, and pixel quality assurance, plus the indices NDVI, NDMI, NBR, NBR2, SAVI, and MSAVI. The MODIS active fire product (MCD14) was used to define when fires occurred. Random Forest classifications...

Global Gridded 1-km Annual Soil Respiration and Uncertainty Derived from SRDB V3

D.L. Warner, B.P. Bond-Lamberty, J. Jian, E. Stell & R. Vargas
This dataset provides six global gridded products at 1-km resolution of predicted annual soil respiration (Rs) and associated uncertainty, maps of the lower and upper quartiles of the prediction distributions, and two derived annual heterotrophic respiration (Rh) maps. A machine learning approach was used to derive the predicted Rs and uncertainty data using a quantile regression forest (QRF) algorithm trained with observations from the global Soil Respiration Database (SRDB) version 3 spanning from 1961 to...

ABoVE: AirSWOT Water Masks from Color-Infrared Imagery over Alaska and Canada, 2017

E.D. Kyzivat, L.C. Smith, L.H. Pitcher, J.V. Fayne, S.W. Cooley, M.G. Cooper, S. Topp, T. Langhorst, M.E. Harlan, C.J. Gleason & T.M. Pavelsky
This dataset provides 1) a conservative open water mask for future water surface elevation (WSE) extraction from the co-registered AirSWOT Ka-band interferometry data, and 2) high-resolution (1 m) water body distribution maps for water bodies greater than 40 m2 along the NASA Arctic-Boreal Vulnerability Experiment (ABoVE) foundational flight lines. The masks and maps were derived from georeferenced three-band orthomosaics generated from individual images collected during the flights and a semi-automated water classification algorithm based on...

Ground-Based Vegetation Community Photos, Toolik Lake Area, Alaska, 2014-2015

H.E. Greaves & E.A. Fortin
This dataset contains 731 ground-based nadir vegetation community and ground surface photographs of selected field plots taken as ground reference data for vegetation classification studies at three areas near Toolik Lake, Alaska during the summers of 2014 and 2015. The largest area, 'Toolik', (approximately 6 km2) covers research areas near Toolik Field Station at Toolik Lake, including Arctic LTER installations. The other two areas are each roughly 3 km2: the 'Pipeline' area: a stretch of...

L2 Daily Solar-Induced Fluorescence (SIF) from ERS-2 GOME, 1995-2003

J. Joiner, Y. Yoshida, P. Koehler, C. Frankenberg & N.C. Parazoo
This dataset provides Level 2 Solar-Induced Fluorescence (SIF) of Chlorophyll estimates derived from the Global Ozone Monitoring Experiment (GOME) instrument on the European Space Agency's (ESA's) European Remote-Sensing 2 (ERS-2) satellite. Each file contains daily raw and bias-adjusted solar-induced fluorescence on an orbital basis (land pixels only), at a resolution of 40 km x 320 km, along with quality control information and ancillary data. Data is provided for the period from 19950701 to 20030622. The...

ABoVE: Ecosystem Map, Great Slave Lake Area, Northwest Territories, Canada, 1997-2011

L.L. Bourgeau-Chavez, J.A. Graham, S. Endres, N.H.F. French, M. Battaglia, D. Hansen & D. Tanzer
This dataset provides an ecosystem type map at 12.5 meter pixel spacing and 0.2 ha minimum mapping unit for the area surrounding Great Slave Lake, Northwest Territories, Canada for the time period 1997 to 2011. The map includes nine classes for peatland, wetland, and upland areas derived from a Random Forest classification trained on multi-date, multi-sensor remote sensing images across the study extent, and using field data and high-resolution Worldview-2 image interpretation for training and...

ABoVE: Annual Phenology Derived from Landsat across the ABoVE Core Domain, 1984-2014

E.K. Melaas, D. Sulla-Menashe, C.E. Woodcock & M.A. Friedl
This dataset provides annual maps of the timing of spring onset with leaf emergence, of autumn onset with leaf senescence, and of peak greenness for each 30 m pixel derived from Landsat time series of Thematic Mapper (TM) and Enhanced Thematic Mapper (ETM+) observations from 1984 to 2014. The ABoVE core domain includes 169 ABoVE grid tiles across Alaska, USA and Alberta, British Columbia, Northwest Territories, Nunavut, Saskatchewan, and Yukon, Canada. The data provided for...

ABoVE: Characterization of Burned and Unburned Boreal Forest Stands, SK, Canada, 2016

C. Dieleman, B.M. Rogers, S. Veraverbeke, J.F. Johnstone, J. Laflamme, L. Gelhorn, K. Solvik, X.J. Walker, M.C. Mack & M.R. Turetsky
This dataset provides the results of field measurements and estimates of carbon stocks and combustion rates that characterize burned and unburned southern boreal forest stands near the La Ronge and Weyakwin communities in central Saskatchewan (SK), Canada. Measurements were completed in 2016 at 47 stands that burned in the 2015 Saskatchewan wildfires (Egg, Philion, and Brady) and at 32 unburned stands in comparable adjacent areas. Stands were characterized through field observations and sampling of the...

ATom: L2 In Situ Measurements of Aerosol Microphysical Properties (AMP)

C.A. BROCK, A. KUPC, C.J. WILLIAMSON, K. FROYD, F. ERDESZ, D.M. MURPHY, G.P. SCHILL, D.W. GESLER, R.J. MCLAUGHLIN, M. RICHARDSON, N.L. WAGNER & J.C. WILSON
This dataset provides the number, surface, and volume concentrations and size distributions of dry aerosol particles measured by the Aerosol Microphysical Properties (AMP) instrument package during airborne campaigns conducted by NASA's Atmospheric Tomography (ATom) mission. Five instruments--two nucleation-mode aerosol size spectrometer (NMASS), two ultra-high sensitivity aerosol spectrometers (UHSAS), and a laser aerosol spectrometer (LAS)--comprise the AMP package. The AMP payload provides size distributions with up to one-second time resolution for dry aerosol particles between 0.003...

NACP Forest Carbon Stocks, Fluxes, and Productivity Estimates, Western USA, 1979-2099

P. BUOTTE, S. LEVIS & B.E. LAW
This dataset contains annual estimates of carbon stocks, fluxes, and productivity over forested land in 11 states of the western USA. The estimates were produced from multiple simulations using the Community Land Model (4.5) with different climate forcing data and prescribed harvest rates. Business as usual (BAU) scenarios were run to ensure that the simulations represented present-day stand ages. The estimates span two modeled time periods, 1979-2014 and 2015-2099, at 1/24-degree (4 km x 4...

ATom: L2 Measurements from Airborne Tropospheric Hydrogen Oxides Sensor (ATHOS)

W.H. BRUNE, D.O. MILLER & A.B. THAMES
This dataset provides the concentrations of hydrogen oxides measured by the Airborne Tropospheric Hydrogen Oxides Sensor (ATHOS) during airborne campaigns conducted by NASA's Atmospheric Tomography (ATom) mission from 2016 - 2018. ATHOS uses laser-induced fluorescence (LIF) to measure hydroxide (OH) and hydroperoxyl (HO2) simultaneously. The measurements include OH and HO2 mixing ratio in parts-per-trillion-by-volume (pptv), OH interference from chemical removal in pptv, and OH reactivity from discharge flow in hertz.

ABoVE: Active Layer and Soil Moisture Properties from AirMOSS P-band SAR in Alaska

R.H. CHEN, A. TABATABAEENEJAD & M. MOGHADDAM
This dataset provides estimates of soil geophysical properties derived from Airborne Microwave Observatory of Subcanopy and Subsurface (AirMOSS) P-band polarimetric synthetic aperture radar (PolSAR) data collected in August and October of 2014, 2015, and 2017 over 12 tundra study sites (with some exceptions) across Northern Alaska. Soil properties reported include the active layer thickness (ALT), dielectric constant, soil moisture profile, surface roughness, and their respective uncertainty estimates at 30-m spatial resolution over the 12 flight...

ABoVE: Characterization of Carbon Dynamics in Burned Forest Plots, NWT, Canada, 2014

X.J. WALKER, J.L. BALTZER, W. LAURIER, S.G. CUMMING, N.J. DAY, S.J. GOETZ, J.F. JOHNSTONE, S. POTTER, B.M. ROGERS, E.A.G. SCHUUR, M.R. TURETSKY & M.C. MACK
This dataset provides field data from boreal forests in the Northwest Territories (NWT), Canada, that were burned by wildfires in 2014. During fieldwork in 2015, 211 burned plots were established. From these plots, thirty-two forest plots were selected that were dominated by black spruce and were representative of the full moisture gradient across the landscape, ranging from xeric to sub-hygric. Plot observations included slope, aspect, and moisture. At each plot, one intact organic soil profile...

LiDAR and PALSAR-Derived Forest Aboveground Biomass, Paragominas, Para, Brazil, 2012

M.M. KELLER, P. DUFFY & W. BARNETT
This dataset provides estimates of forest aboveground biomass for three study areas and the entire Paragominas municipality, in Para, Brazil, in 2012. Aboveground biomass (in megagrams of carbon per hectare) was measured for inventory plots within the study (focal) areas, and then assimilated and modeled with LiDAR and PALSAR metrics using gradient boosting machines (GBM) to predict spatially explicit forest aboveground biomass and uncertainties for the entire focal areas. The PALSAR data across the three...

ABoVE: Multi-model Uncertainty of Carbon Stocks and Fluxes across ABoVE Domain, 2003

J.B. FISHER
This dataset provides estimates of the uncertainty in components of the carbon cycle including: soil carbon stock, autotrophic respiration (Ra), heterotrophic respiration (Rh), net ecosystem exchange (NEE), net primary production (NPP), and gross primary productivity (GPP) across the entire ABoVE Study Domain at 0.5-degree resolution for the reference year 2003. The uncertainties were calculated from the multi-model (n = 20) disagreement, i.e. standard deviation, from the Trends in Net Land Atmosphere Carbon Exchanges program (TRENDY)...

Ocean Surface pCO2 and Air-Sea CO2 Flux in the Northern Gulf of Mexico, 2006-2010

S. LOHRENZ, W. CAI, S. CHAKRABORTY, R. HE & H. TIAN
This dataset provides 1 km gridded monthly estimates of surface ocean partial pressure of CO2 (pCO2) and air-sea flux of CO2 (CO2 flux) for the northern Gulf of Mexico for the period 2006 through 2010. Estimates of pCO2 were derived from MODIS/Aqua satellite imagery in combination with ship-based observations. Estimates of CO2 flux were derived from estimates of seawater pCO2, wind fields, and atmospheric pCO2.

ABoVE: AirSWOT Ka-band Radar over Surface Waters of Alaska and Canada, 2017

J.V. FAYNE, L.C. SMITH, L.H. PITCHER & T.M. PAVELSKY
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PhenoCam Dataset v2.0: Digital Camera Imagery from the PhenoCam Network, 2000-2018

T. Milliman, B. Seyednasrollah, A.M. Young, K. Hufkens, M.A. Friedl, S. Frolking, A.D. Richardson, M. Abraha, D.W. Allen, M. Apple, M.A. Arain, J. Baker, J.M. Baker, C.J. Bernacchi, J. Bhattacharjee, P. Blanken, D.D. Bosch, R. Boughton, E.H. Boughton, R.F. Brown, D.M. Browning, N. Brunsell, S.P. Burns, M. Cavagna, H. Chu … & J. Verfaillie
This dataset provides a time series of visible-wavelength digital camera imagery collected through the PhenoCam Network at each of 393 sites predominantly in North America from 2000-2018. The raw imagery was used to derive information on phenology, including time series of vegetation color, canopy greenness, and phenology transition dates for the PhenoCam Dataset v2.0. The PhenoCam data are released under a CC-BY license.

ABoVE: Reflectance Spectra of Tundra Plant Communities across Northern Alaska

S.V. ZESATI, C.E. TWEEDIE, K.F. HUEMMRICH, P.K. CAMPBELL & M. VELEZ-REYES
This dataset reports full-spectrum (350-2500 nm) reflectance measurements of diverse plant communities at the plot-level and individual plant species at the leaf-level, at multiple sites across northern Alaska during the 2017 and 2018 summer field seasons. Plot-level reflectance data (1 m2) include an assemblage of vascular and non-vascular species comprising tundra plant communities, while leaf-level scans are specific to one particular tundra species. Reflectance measurements were collected using a HR-1024i spectrometer and data were calibrated...

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