Status report on the key climate variables technical supplement to the



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Main climate application

This is needed for climate change modelling and estimation of national greenhouse gas (GHG) inventories. These gases – largely nitrous and nitric oxide are responsible for up to 10% of the anthropogenic greenhouse effect. Terrestrial ecosystems account for about two-thirds of the emissions, split roughly 50:50 between natural ecosystems (soils) and agriculture (about 25% from mineral fertiliser and 50% from livestock and their manure) though there is great uncertainty about this because of the wide range of emission coefficients for different agricultural sources. Emissions could increase 35-60% over the next 30 years, so it is important to improve the spatial coverage and quality of the non C GHG data going into climate change modelling.

Contributing baseline GCOS observations

None.

Other contributing observations

FAO soil map of the world and AEZ data. FAO AGROSTAT for land cover and land use data including livestock numbers and mineral fertiliser use. TOPC fire area and the Global Fire Product. IGBP experiments.

Significant data management issues

Lack of consensus on approach for land use classification.

Analysis products

Time series for national and sub-national average emissions from livestock and fertilizer use.

Time series for national average emissions from natural ecosystems using soil and AEZ data.



Current capability

Land cover estimates from remote sensing can be combined with vegetation maps and national agricultural statistics to provide land use estimates. These can be used with survey data on fertilizer use by crops and average emission values to give gross N2O and NOx estimates of +/- 50% accuracy.

Issues and priorities

  • There is great uncertainty about the magnitude of the current agricultural contribution of 4.7 million ton per year to total global emissions, because:

  • many of the contributing observations are national average values and are not spatially explicit;

  • the high heterogeneity of natural ecosystems and different agricultural sources leads to a wide range of estimates in mean emission values (e.g. because of the sensitivity of N2O formation to climate, soil type, tillage practices, and type and placement of fertilizer);

  • it is likely that some emission rates are very non-linear, e.g. N2O from mineral fertilisers yet there is only limited information on this;

  • some of the most comprehensive estimates are from short-term experiments.

  • For some countries, the contribution from terrestrial ecosystems to greenhouse gas emissions (GHG) emissions is a greater proportion of the national totals than fossil fuels.

  • Lack of consensus on land use classification approaches and generally weak data base on present land-use though poor progress is a funding issue rather than a technological one. Action here is required for many other parameters and global change assessments and hence should receive high priority.

  • As with methane the main increase in emissions over the next 25-50 years may come from the livestock sector though uncertainties regarding the contribution of biomass burning will remain important for some time. Priority should therefore be given to estimating improved average emission factors for livestock systems and manure use and better integration of satellite and in situ observations for vegetation type and biomass density.

GENERAL REFERENCES
CEOS Yearbook, 1997: Committee on Earth Observation satellites: Towards an Integrated Global Observing Strategy. Smith System Engineering Limited, UK. Copyright  1997 European Space Agency (ESA).
IPCC, 2001: Climate Change 2001: The Scientific Basis. Contribution of Working Group I to the third assessment report of the Intergovernmental Panel on Climate Change [J.T. Houghton, Y. Ding, D.J. Griggs, M. Noguer, P.J. van der Linden, X. Dai, K. Maskell, and C.A. Johnson (eds.)]. Cambridge University Press, Cambridge, United Kingdom.
NRC (National Research Council), 1999: Adequacy of the climate observing systems. National Academy Press, Washington, D.C., 51pp.
OceanObs 99 Conference Statement. OceanObs 99 International Conference on the Ocean Observing System for Climate, 18-22 Oct. 1999, Saint-Raphaël, France.
WMO (World Meteorological Organization), 1998: Report on the adequacy of the Global Climate Observing Systems -- United Nations Framework Convention on Climate Change, WMO GCOS-48. World Meteorological Organization, Geneva, Switzerland.
Acronyms and Abbreviations
ACE-2 North Atlantic Regional Aerosol Characterization Experiment

ADCP Acoustic Doppler Current Profiler

AEROCE Aerosol Oceanic Chemistry Experiment

AEZ Agro-Ecological Zoning (FAO system for land resource assessment)

AGAGE Advanced Global Atmospheric Gas experiment

AMDAR Aircraft Meteorological Data Relay

AMSR-E Advanced Microwave Scanning Radiometer-EOS, NASA

AMSU Advanced MSU

AO Arctic Oscillation

AOGCMS Atmosphere-Ocean General Circulation Model

AOPC Atmospheric Observation Panel for Climate

AQUA NASA Earth science satellite mission to study the Earth’s water cycle

Argo A global array of profiling floats (part of IGOS)

ARM Atmospheric Radiation Measurements

ASAP Automated Shipboard Aerological Programme

ASDAR Aircraft-to-Satellite Data Relay

ASOS Automated Surface Observing System

ASTER Advanced Spaceborne Thermal Emission and Reflection Radiometer

ATSR Along Track Scanning Radiometer

AUV Autonomous Underwater Vehicle

AVHRR Advanced Very High Resolution Radiometer

AWOS Automated Weather Observing System

BATS Bermuda Atlantic Time Series

BSRN Baseline Surface Radiation Network

CACGP Commission for Atmospheric Chemistry and Global Pollution

CALM Circumpolar Active Layer Monitoring

CAPMoN Canadian Air and Precipitation Monitoring Network

CARDS Comprehensive Aerological Reference Data Set

CBS Commission for Basic Systems

CCN Cloud Condensation Nuclei

CDIAC Carbon Dioxide Information Analysis Center

CEOS Committee on Earth Observation Satellites

CERES Cloud and Earth Radiant Energy System

CliC Climate and Cryosphere (WCRP)

CLIMAT Monthly surface climate summary report

CLIMAT TEMP Report of monthly aerological means from a land station

CLIVAR Climate Variability and Predictability (study) of WCRP

CLP Cold Land Processes Experiment

CMDL Climate Monitoring and Diagnostic Laboratory

COADS Comprehensive Ocean Atmosphere Data Set

COAPS Center for Ocean-Atmosphere Prediction Studies, FSU

COARE Coupled Ocean-Atmosphere Response Experiment (TOGA)

COP Conference of the Parties (to UNFCCC)

COSMIC Constellation Observing System for Meteorology, Ionosphere and Climate

CRF Cloud Radiative Forcing

CRN Climate Reference Network

CRU Climatic Research Unit, University of East Anglia (UK)

CRYSYS Study of variability and change in the Canadian CRYospheric SYStem

CTD Conductivity-Temperature-Depth Probe

DAO Data Assimilation Office (NASA, USA)

DARE DAta REscue

DEM Digital Elevation Model

DIC Dissolved Inorganic Carbon

DMS Data Management System

DMSP Defense Meteorological Satellite Program (USA)

DORIS Doppler Orbitography by Radiopositioning Integrated by Satellite

DQO Data Quality Objective

DWD Deutscher Wetterdienst (Germany)

EASE Equal Area Scalable Earth (grid)

ECMWF European Centre for Medium range Weather Forecasts

EF Evaporation Fraction

EI Environment Institute

EMEP Co-operative programme for monitoring and evaluation of the long-range transmission of air pollutants in Europe

ENSO El Niño/Southern Oscillation

EOS Earth Observing Satellite

EOSDIS Earth Observing System Data Information System

ERA ECMWF ReAnalysis

ERB Earth Radiation Budget

ERBE Earth Radiation Budget Experiment

ERBS Earth Radiation Budget Satellite

ESA European Space Agency

ETH Federal Institute of Technology, Zurich

EUMETSAT European Organization for the Exploitation of Meteorological Satellites

FAO Food and Agriculture Organization of the United Nations

FAPAR Fraction of Photosynthetically Active Radiation

FLUXNET Global network to measure exchanges of CO2, water vapour and energy between terrestrial ecosystems and the atmosphere

FoG Fluctuations of Glaciers

FPAR Plant-absorbed Fraction of Incoming Photosynthetically Active Radiation

FSU Florida State University

GAW Global Atmosphere Watch

GAWSIS GAW Information System

GAWTEK GAW Training and Education Centre

GCM General (or global) Circulation Model

GCN GLOCC Core Network

GCOS Global Climate Observing System (WMO/IOC/ICSU/UNEP)

GDP Global Drifter Program

GEBA Global Energy Budget Archive, Zurich

GEF Global Environment Facility

GEMS Global Environmental Monitoring System

GEOSECS Geochemical Ocean Sections Study

GERB Geostationary Earth Radiation Budget

GHCN Global Historical Climatological Network

GHG Greenhouse Gas

GHOST Global Heirarchical Observing Strategy

GLIMS Global Land Ice Measurements from Space

GLOSS Global Sea Level Observing System

GMS Geostationary Meteorological Satellite (Japan)

GO3OS Global Ozone Observing System

GOCE Gravity Field and Steady-State Ocean Circulation Mission (ESA)

GODAE Global Ocean Data Assimilation Experiment

GOES Geostationary Operational Environmental Satellite

GOOS Global Ocean Observing System (IOC/WMO/ICSU/UNEP)

GOS Global Observing System

GPCC Global Precipitation Climatology Centre

GPCP Global Precipitation Climatology Project

GPS Global Positioning System

GRACE Gravity Recovery and Climate Experiment

GRAS Global navigation satellite systems radio occultation GNSS Receiver for Atmospheric Sounding (ESA)

GRDC Global Runoff data Centre, Koblenz

GRID Global Resource Information Database

GSN GCOS Surface Network

GSNMC GCOS Surface Network Monitoring Centre

GTN-G Global Terrestrial Network for Glaciers

GTN-H Global Terrestrial Network for Hydrology

GTN-E Global Terrestrial Network for Ecology

GTN-P Global Terrestrial Network for Permafrost

GTOS Global Terrestrial Observing System (FAO/ICSU/UNEP/UNESCO/WMO)

GTS Global Telecommunications System

GUAN GCOS Upper Air Network

HadRT Hadley Centre data set of monthly global gridded temperature anomalies computed from radiosonde station data from 1958 to present

HadSLP Hadley Centre Historical gridded global monthly Mean Sea Level Pressure (MSLP) data set

HCN Historical Climatology Network

HSDSD Historical Soviet Daily Snow Depth

HOT Hawaii Ocean Time-series

IAEA International Atomic Energy Agency

IASI Infrared Atmospheric Sounding Interferometer

ICLAS International Coordination group for Laser Atmospheric Studies

ICOADS International Comprehensive Ocean Atmosphere Data Set

ICOLD International Commission on Large Dams

ICSI International Commission on Snow and Ice

ICSU International Council for Science

IGAC International Global Atmospheric Chemistry Programme

IGACO Integrated Global Atmospheric Chemistry Observation

IGBP International Geosphere-Biosphere Programme

IGOS Integrated Global Observing Strategy

IGOSS Integrated Global Ocean Services System (IOC/WMO)

IGRAC International Groundwater Resources Assessment centre

IHDP International Human Dimensions Programme on Global Environmental Change

ILEC International Lake Environment Committee

IMPROVE Interagency Monitoring of Protected Visual Environments Network

IMS Interactive Multisensor Snow and Ice Mapping System

IOC Intergovernmental Oceanographic Commission (of UNESCO)

IOC International Ozone Commission

IOCCG International Ocean Colour Coordinating Group

IPA International Permafrost Association

IPCC Intergovernmental Panel on Climate Change (WMO/UNEP)

IR Infrared

IRRI International Rice Research Institute

IUGG International Union of Geodesy and Geophysics

JASON Oceanography mission to study global ocean circulation (post-Topex/Poseidon)

JCOMM Joint Technical Commission for Oceanography and Marine Meteorology

JGOFS Joint Global Ocean Flux Study (within IGBP)

JMA Japan Meteorological Agency

JRC Joint Research Centre

LAI Leaf Area Index

LIDAR Light Detection and Ranging

LUCC Land-Use and Cover Change (IGBP/IHDP)

MBB Mass Balance Bulletin

MCDW Monthly Climatic Data of the World (surface and upper air)

MISR Multi-angle Imaging Spectrometer

ML (Upper ocean) Mixed Layer

MODIS Moderate Resolution Imaging Spectroradiometer

MOPITT Measurement of Pollution in the Troposphere

MSU Microwave Sounding Unit

NAO North Atlantic Oscillation

NARSTO North American Research Strategy for Tropospheric Ozone

NASA National Aeronautics and Space Administration (USA)

NASDA National Space Development Agency (Japan)

NCAR National Center for Atmospheric Research (USA)

NCDC National Climatic Data Center of NOAA (USA)

NCEP National Centres for Environmental Prediction of NOAA (USA)

NDSC Network for the Detection of Stratospheric Change (USA)

NDSI Normalized Difference Snow Index

NDVI Normalized Difference Vegetation Index

NEE Net Ecosystem Exchange from Eddy Correlation, CO2 Flux

NERC Natural Environment Research Council (UK)

NESDIS National Environmental Satellite, Data and Information Service of NOAA (USA)

NH Northern Hemisphere

NHS National Hydrological Service

NILU Norwegian Institute for Air Research

NMHS National Meteorological and Hydrological Service

NMS National Meteorological Service

NOAA National Oceanic and Atmospheric Administration

NODC National Oceanic Data Center

NPOESS National Polar Orbiting Operational Environmental Satellite System

NPP Net Primary Production

NRC National Research Council (USA)

NSCAT NASA Scatterometer

NSF National Science Foundation

NSIDC National Snow and Ice Data Center

NVAP NASA Water Vapor Project

NWP Numerical Weather Prediction

NWS National Weather Service

OACES Ocean Atmosphere Carbon Exchange Study, NOAA

ONR Office of Naval Research

OOPC Ocean Observations Panel for Climate

OSE Observing System Experiment

PACE Permafrost and Climate in Europe

PAR Photosynthetically Available Radiation

PATMOS Pathfinder Atmosphere

PDO Pacific Decadal Oscillation

PET Potential Evapotranspiration

PFR Precision Filter Radiometer

PIBALs Wind Soundings

PIRATA Pilot Research Moored Array in the Tropical Atlantic

PO.DAAC Physical Oceanography Distributed Active Archive Center

POES Polar Orbiting Environmental Satellite

PSC Polar Stratospheric Clouds

PSMSL Permanent Service for Mean Sea Level

PUMA Preparation for the use of METEOSAT Second Generation in Africa

QA/QC Quality Assurance/Quality Control

RAOBS Radiosonde soundings

RBCN Regional Basic Climate network

RBSN Regional Basic Synoptic Network

RCM Regional Climate Model

RH Relative humidity

RIVM Rijksinstituut voor Volksgezondheid en Milieu, NL

SAG Scientific Advisory Group

SATOBS Satellite Wind Observations

SBSTA Subsidiary Body for Scientific and Technical Advice (of UNFCCC/COP)

SeaBASS SeaWiFS Bio-optical Archive and Storage System

SeaDASS SeaWiFS Data Analysis System

SeaWiFS Sea-viewing Wide-Field-of-view Sensor

SEVIRI Spinning Enhanced Visual and Infrared Imager

SH Southern Hemisphere

SHADOZ Southern Hemisphere ADditional OZonesondes

SHI State Hydrological Institute, St. Petersberg

SMMR Scanning Multichannel Microwave Radiometer

SOOP Ship of Opportunity Programme

SOP Standard Operating Procedure

SPARC Stratospheric Processes and their Role in Climate (of WCRP)

SRB Surface Radiation Budget

SSM/I Special Sensor Microwave/Imager

SST Sea Surface Temperature

SWE Snow Water Equivalent

SYNOP Report of surface meteorological observation (synoptic time) from a land station

T Temperature (Td, dew point temperature; Tw, Wet bulb Temperature)

TAO Tropical Atmosphere Ocean Array

TAR Third Assessment Report (of IPCC)

TERRA Flagship satellite of NASA’s Earth Observing System

TIROS Television Infrared Observations Satellite

TIROS-N Next-generation TIROS

TOA Top of the Atmosphere

TOGA Tropical Ocean-Global Atmosphere study of WCRP

TOMS Total Ozone Mapping Spectrometer

TOPC Terrestrial Observations Panel for Climate

TOPEX Ocean Surface Topography Experiment

TOPEX/POSEIDON US/French Ocean Topography Satellite Altimeter Experiment

TOVS TIROS Operational Vertical Sounder

TRITON Triangle Trans Ocean Buoy Network (Japan)

TRMM Tropical Rainfall Measurement Mission

UARS Upper Atmosphere Research Satellite

UCI University of California at Irvine

UM University of Miami

UN United Nations

UNCED United Nations Conference on Environment and Development (Brazil, 1992)

UNDP United Nations Development Programme

UNEP United Nations Environment Programme

UNESCO United Nations Educational Scientific and Cultural Organization

UNFCCC United Nations Framework Convention on Climate Change

UTC Co-ordinated Universal Time

VOS Volunteer Observing Ship

VOSCLIM Volunteer Observing Ship Climate Project

WB World Bank

WCP World Climate Programme

WCRP World Climate Research Programme

WDC World Data Centre

WDCGG WDC for Greenhouse Gases

WGI IPCC Working Group I

WGII IPCC Working Group II

WGIII IPCC Working Group III

WGMS World Glacier Monitoring Service

WHO World Health Organization

WHYCOS World Hydrological Cycle Observing System

WMO World Meteorological Organization

WOCE World Ocean Circulation Experiment (of WCRP)

WOOD World Ocean Optical Data

WORCC World Optical Depth Research and Calibration Centre, Davos

WOUDC World Ozone and UV Data Center (Canada)

WRC World Radiation Centre, Davos

WRDC World Radiation Data Centre, St. Petersberg, Russia

WWW World Weather Watch

XBT eXpendable Bathy-Thermograph
Chemistry terms
C Carbon

CCl4 Carbon tetrachloride



CFC Chlorofluorocarbon

CH3CCl3 Methyl chloroform

Ch4 Methane

CO Carbon Monoxide

C02 Carbon Dioxide

h2 Hydrogen

HCFC Hydrochloroflurocarbon

HFC Hydroflurocarbon

H2O Water vapour

MSA Methanesulfonate

N2 Molecular Nitrogen

NH3 Ammonia

No Nitric Oxide

NO2 Nitrogen Dioxide

NOx Nitrogen Oxides (NO and NO2)

N2O Nitrous Oxide

O2 Molecular Oxygen

O3 Ozone

PFC Perfluorocarbon

SF6 Sulphur hexafluoride

SO2 Sulphur Dioxide

VOC Volatile Organic Compound




1 The Second Report on the Adequacy of the Global Observing Systems for Climate in Support of the UNFCCC. GCOS-82, April 2003.



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