| AAFC |
Agriculture and Agri-Food Canada |
| ACEP |
Agricultural Conservation Easement Program |
| ACT-America |
Atmospheric Carbon and Transfer–America program |
| AFOLU |
agriculture, forestry, and other land use |
| AIM |
atmospheric inverse modeling |
| ALOHA |
A Long-Term Oligotrophic Habitat Assessment |
| ALT |
active layer thickness |
| ALU |
agriculture and land use |
| ARCTAS |
Arctic Research of the Composition of the Troposphere from Aircraft and Satellites |
| ARPA-E |
Advanced Research Projects Agency–Energy (DOE) |
| ARRA |
American Recovery and Reinvestment Act |
| ARS |
Agricultural Research Service (USDA) |
| ATom |
Atmospheric Tomography Mission |
| BATS |
Bermuda Atlantic Time-series Study |
| BCS |
Beaufort and Chukchi Seas |
| BECCS |
bioenergy carbon capture and storage |
| BS |
Bering Sea |
| C4MIP |
Coupled Climate–Carbon Cycle Model Intercomparison Project |
| CAA |
Canadian Arctic Archipelago |
| CAA |
U.S. Clean Air Act |
| CAFC |
Company Average Fuel Consumption |
| CAFE |
corporate average fuel economy |
| CAIT |
Climate Access Indicators Tool |
| CalNex |
California Research at the Nexus of Air Quality and Climate Change |
| CAM |
crassulacean acid metabolism |
| CAMS |
Copernicus Atmospheric Monitoring Service |
| CanSIS |
Canadian Soil Information Service |
| CARAFE |
CARbon Atmospheric Flux Experiment |
| CARVE |
Carbon in Arctic Reservoirs Vulnerability Experiment |
| CCAFS-MOT |
Climate Change, Agriculture, and Food Security–Mitigation Options Tool |
| CCGT |
combined-cycle gas turbine |
| CCIWG |
Carbon Cycle Interagency Working Group (USGCRP) |
| CCS |
carbon capture and storage |
| CCSC |
Central California Current System |
| CCSN |
Northern California Current System |
| CCSS |
Southern California Current System |
| CDIAC |
Carbon Dioxide Information Analysis Center |
| CDU |
carbon dioxide utilization |
| CEC |
Commission for Environmental Cooperation |
| CEMAC |
Clean Energy Manufacturing Analysis Center |
| CFC |
chlorofluorocarbons |
| CFE |
community forest enterprise |
| CMIP |
Coupled Model Intercomparison Project |
| CONUS |
conterminous United States |
| CP |
certificate of possession |
| CPP |
U.S. Clean Power Plan |
| CRP |
Conservation Reserve Program |
| CSKT |
Confederated Salish and Kootenai Tribes |
| CSSR |
Climate Science Special Report |
| DIC |
dissolved inorganic carbon |
| DISCOVER-AQ |
Deriving Information on Surface Conditions from Column and Vertically Resolved Observations Relevant to Air Quality |
| DOC |
U.S. Department of Commerce |
| DOC |
dissolved organic carbon |
| DOD |
U.S. Department of Defense |
| DOE |
U.S. Department of Energy |
| DOI |
U.S. Department of the Interior |
| DOM |
dissolved organic matter |
| DOS |
U.S. Department of State |
| DOT |
U.S. Department of Transportation |
| E10 |
10% blended ethanol |
| E3MC |
Energy, Emissions and Economy Model for Canada |
| ECBM |
enhanced coal bed methane recovery |
| EDCM |
Erosion-Deposition-Carbon-Model |
| EERE |
Energy Efficiency and Renewable Energy (DOE) |
| EEZ |
Exclusive Economic Zone |
| EIA |
U.S. Energy Information Administration |
| EISA |
Energy Independence and Security Act |
| ENSO |
El Niño-Southern Oscillation |
| EOR |
enhanced oil recovery |
| EPA |
U.S. Environmental Protection Agency |
| ESM |
Earth System Model |
| ESRL |
Earth System Research Laboratory (NOAA) |
| EU |
European Union |
| ExACT |
Ex-Ante Carbon-balance Tool |
| FACE |
Free-Air CO2 Enrichment |
| FAO |
Food and Agriculture Organization |
| FFC |
fossil fuel consumption |
| FIA |
Forest Inventory and Analysis |
| FLFL |
forestland remaining forestland |
| FOLU |
forestry and other land use |
| FTS |
Fourier Transform Spectrometer |
| FVS |
Forest Vegetation Simulator |
| GAK |
Gulf of Alaska |
| GCP |
Global Carbon Project |
| GCRA |
Global Change Research Act |
| GDP |
gross domestic product |
| GEMS |
General Ensemble Biogeochemical Modeling System |
| GeoCARB |
Geostationary Carbon Cycle Observatory |
| GHG |
greenhouse gas |
| GIS |
geographic information system |
| GMx |
Gulf of Mexico |
| GOM |
Gulf of Maine |
| GOSAT |
Greenhouse Gases Observing Satellite |
| GPP |
gross primary production |
| GRACEnet |
Greenhouse gas Reduction through Agricultural Carbon Enhancement network |
| GStL |
Gulf of St. Lawrence and Grand Banks |
| GWP |
global warming potential |
| HB |
Hudson Bay |
| HIAPER |
High-Performance Instrumented Airborne Platform for Environmental Research |
| HIPPO |
HIAPER Pole-to-Pole Observations |
| IAGOS |
In-service Aircraft for a Global Observing System |
| IAM |
integrated assessment model |
| IASI |
Infrared Atmospheric Sounding Interferometer |
| IEA |
International Energy Agency |
| ILAMB |
International Land Model Benchmarking |
| INFLUX |
Indianapolis Flux Experiment |
| INGAA |
Interstate Natural Gas Association of America |
| IPCC |
Intergovernmental Panel on Climate Change |
| IPCC AR5 |
Fifth Assessment Report of the IPCC; also WG1, WG2, WG3 – Working Groups 1–3 |
| SGCR |
Subcommittee on Global Change Research (National Science and Technology Council, White House) |
| IQA |
Information Quality Act |
| ITC |
Investment Tax Credit |
| LCOE |
levelized cost of energy |
| LECZ |
low-elevation coastal zone |
| LEED |
Leadership in Energy and Environmental Design |
| LIDAR |
light detection and ranging |
| LS |
Labrador Shelf |
| LULC |
land use and land cover |
| LULUCF |
land use, land-use change, and forestry |
| MAB |
Mid-Atlantic Bight |
| MCI |
Mid-Continent Intensive |
| MIROC |
Model for Interdisciplinary Research on Climate |
| MODIS |
Moderate Resolution Imaging Spectroradiometer |
| MOPITT |
Measurements Of Pollution In The Troposphere |
| NAA |
North American Arctic |
| NAAC |
North American Atlantic Coast |
| NAAEC |
North American Agreement on Environmental Cooperation |
| NACP |
North American Carbon Program |
| NAO |
North Atlantic Oscillation |
| NAPC |
North America Pacific Coast |
| NASA |
National Aeronautics and Space Administration |
| NASEM |
National Academies of Sciences, Engineering, and Medicine |
| NCA |
National Climate Assessment |
| NCA3 |
Third National Climate Assessment |
| NCA4 |
Fourth National Climate Assessment |
| NCAR |
National Center for Atmospheric Research |
| NDC |
Nationally Determined Contributions |
| NDVI |
normalized difference vegetation index |
| NECB |
net ecosystem carbon balance |
| NEE |
net ecosystem exchange |
| NEMS |
National Energy Modeling System |
| NEON |
National Ecological Observatory Network |
| NEP |
net ecosystem production |
| NGHGI |
National Greenhouse Gas Inventory |
| NGO |
non-governmental organization |
| NICC |
National Indian Carbon Coalition |
| NIFA |
National Institute of Food and Agriculture (USDA) |
| NIST |
National Institute of Standards and Technology |
| NOAA |
National Oceanic and Atmospheric Administration |
| NPP |
net primary production |
| NRCS |
Natural Resources Conservation Service (USDA) |
| NSA |
North Slope of Alaska |
| NSF |
National Science Foundation |
| NWCA |
National Wetland Condition Assessment |
| NWI |
National Wetlands Inventory |
| OCO-2 |
Orbiting Carbon Observatory-2 |
| ODIAC |
Open-source Data Inventory for Anthropogenic CO2 |
| OECD |
Organisation for Economic Cooperation and Development |
| OM |
organic matter |
| OMB |
Office of Management and Budget (White House) |
| OPEC |
Organization of Petroleum Exporting Countries |
| OSTP |
Office of Science and Technology Policy (White House) |
| pCO2 |
partial pressure of CO2 |
| PIC |
particulate inorganic carbon |
| POC |
particulate organic carbon |
| POM |
particulate organic matter |
| PPP |
purchasing power parity |
| PPR |
Prairie Pothole Region |
| PTC |
production tax credit |
| PUC |
public utilities commission |
| PV |
photovoltaic |
| RaCA |
Rapid Carbon Assessment |
| RCP |
Representative Concentration Pathway |
| RD&D |
research, development, and demonstration |
| RE |
renewable energy |
| RECCAP |
Regional Carbon Cycle Assessment and Progresses |
| REDD+ |
Reducing Emissions from Deforestation and Forest Degradation |
| RPR (also R/P) |
reserve-to-production ratio |
| RUBISCO |
ribulose-1,5-bisphosphate carboxylase oxygenase |
| SAB |
South Atlantic Bight |
| SCB |
Southern California Bight |
| SD |
standard deviation |
| SE |
standard error |
| SD |
standard deviation |
| SGCR |
Subcommittee on Global Change Research (National Science and Technology Council, White House) |
| SGP |
Southern Great Plains |
| SI |
International System of Units |
| SIF |
solar-induced fluorescence |
| SMR |
small mountainous river |
| SOC |
standard deviation |
| SOCCR1 |
First State of the Carbon Cycle Report |
| SOCCR2 |
Second State of the Carbon Cycle Report |
| SOM |
soil organic matter |
| SPRUCE |
Spruce and Peatland Responses Under Changing Environments |
| SRES |
Special Report on Emissions Scenarios (IPCC, 2000) |
| SS |
Scotian Shelf |
| SSP |
Shared Socioeconomic Pathway |
| SSURGO |
Soil Survey Geographic database |
| STATSGO |
State Soil Geographic database |
| TBM |
terrestrial biosphere model |
| TCCON |
Total Carbon Column Observing Network |
| TCU |
tribal colleges and universities |
| TOC/td>
| total organic carbon |
| TransCom |
Atmospheric Tracer Transport Model Intercomparison Project |
| UCAR |
University Corporation for Atmospheric Research |
| UHI |
urban heat island |
| UN |
United Nations |
| UNFCCC |
United Nations Framework Convention on Climate Change |
| USAID |
U.S. Agency for International Development |
| USDA |
U.S. Department of Agriculture |
| USFWS |
U.S. Fish and Wildlife Service |
| USGCRP |
U.S. Global Change Research Program |
| USGS |
U.S. Geological Survey |
| VOC |
volatile organic compound |
| WRI |
World Resources Institute |
