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Measurement (GCOS)a
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Strategy
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Current Status
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Follow-on (2010–2020)
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RFI Responseb
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Sea state (2.1), surface wind (1.1)
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Microwave imagers
Surface windspeed
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SSM/I on DMSP (1995, 1997, 1999)
AMSR-E on Aqua (2002)
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CMIS on NPOESS
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56, 98
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Scatterometer
Surface wind vector
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QuikSCAT (1999)
ASCAT on MetOp)
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ASCAT (MetOp)
Mission 4
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Ocean color (2.1)
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Multispectral imagers with UV-blue capabilities
Surface-leaving radiances
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SeaWiFS (1997)
MODIS on Terra (2000), Aqua (2002)
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VIIRS on NPP (2009), and NPOESS
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21, 86
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Ocean surface (2.1) and sub-surface temperature (2.2)
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Multispectral imagery
Sea-surface temperature
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AVHRR, data since 1981 (NOAA 7), currently on NOAA 16, 17, 18
VIRS on TRMM (1997)
MODIS on Terra (2000), Aqua (2002)
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VIIRS on NPP (2009), and NPOESS
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Infrared-microwave sounders
Sea-surface temperature
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AVHRR on NOAA 16, 17, 18
AIRS, AMSR-E on Aqua (2002)
MODIS on Aqua (2002), Terra (1999)
MODIS
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CrIS/ATMS on NPP (2009), CMIS on NPOESS
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Expendable profiling floats
Profiles of temperature, temperature at depth of neutral buoyancy, surface
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ARGO floats
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Ocean surface (2.1), subsurface salinity (2.2)
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Microwave radiometer and scatterometer
Surface salinity, ocean roughness
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AQUARIUS (2010)
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Expendable profiling floats
Profiles of salinity, salinity at depth of neutral buoyancy
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ARGO floats
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Ocean surface (2.1), subsurface currents (2.2)
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Altimeter
Ocean-surface height from which currents derived
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Jason 1 (2001)
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ALT on NPOESS
Mission 4
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Gravity satellite
Subsurface or barotropic mass shifts (computed in conjunction with surface altimeter measurements)
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GRACE (2002)
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GRACE follow-on
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Expendable profiling floats
Position drift at depth of neutral buoyancy (and surface with some caveats)
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ARGO floats
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Subsurface phytoplankton (2.2)
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Precipitation (1.1)
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Microwave imagers
Rainfall rate over oceans
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SSM/I on DMSP (1995, 1997, 1999)
TMI on TRMM (1997)
AMSR-E on Aqua (2002)
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CMIS on NPOESS, GPM (2012)
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Precipitation radar
Vertical structure of rain rates
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TRMM (1997)
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GPM (2012)
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Cloud radar
Rate for light drizzle
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CloudSat (2006)
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Mission 1
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aNumbers in parentheses refer to the essential climate variables listed in Appendix 1 of CGOS (2003).
bAn indexed list of RFI responses is given in Appendix E.
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