SeaDAS Training ~ NASA Ocean Biology Processing Group 1 Sea surface temperature (SST) basics NASA Ocean Biology Processing Group Goddard Space Flight Center,

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Presentation transcript:

SeaDAS Training ~ NASA Ocean Biology Processing Group 1 Sea surface temperature (SST) basics NASA Ocean Biology Processing Group Goddard Space Flight Center, Greenbelt, Maryland, USA SeaDAS Training Material

SeaDAS Training ~ NASA Ocean Biology Processing Group 2 MODIS sea surface temperature (SST) longwave SST (11-12  m), day and night shortwave SST (  m), night only SST quality level (0-4) brightness temperatures (all thermal ) thermal band suite: related ocean products:

SeaDAS Training ~ NASA Ocean Biology Processing Group 3 MODIS data acquisition

SeaDAS Training ~ NASA Ocean Biology Processing Group 4 Level-2 SST processing (1) convert observed radiances to brightness temperatures (BTs) (2) apply empirical algorithm to relate brightness temperature in 2 wavelengths to SST sst = a0 + a1*BT 1 + a2*(BT 2 -BT 1 ) + a3*(1.0/  -1.0) (3) assess quality (0=best, 4=not computed) * e.g., cloud or residual water vapor contamination * no specific “cloud mask”

SeaDAS Training ~ NASA Ocean Biology Processing Group 5 Daytime SST products longwave SSTshortwave SST Sun glint cloud

SeaDAS Training ~ NASA Ocean Biology Processing Group 6 Nighttime SST products longwave SSTshortwave SST Cloud cloud

SeaDAS Training ~ NASA Ocean Biology Processing Group 7 SST quality levels QL=0 QL=1 QL=2 QL=4 QL=3 shortwave SSTshortwave SST QL

SeaDAS Training ~ NASA Ocean Biology Processing Group 8 SST quality tests SST quality levels

SeaDAS Training ~ NASA Ocean Biology Processing Group 9 SST validation buoy measurements

SeaDAS Training ~ NASA Ocean Biology Processing Group 10 References K.A. Kilpatrick et al., J. Geophys. Res. 106, (2001)

SeaDAS Training ~ NASA Ocean Biology Processing Group 11 Shortwave SST sst4 = a0 + a1*BT39 + a2*dBT + a3*(1.0/  -1.0) where: BT39 = brightness temperature at um, in deg-C BT40 = brightness temperature at um, in deg-C  = cosine of sensor zenith angle dBT = BT39 - BT40 a0, a1, a2, a3 - fit coefficients derived derived by regression of MODIS BTs with in situ buoys vary seasonally (probably due to residual water-vapor effects) determined by science team PI (Peter Minnett and Univ. Miami staff)

SeaDAS Training ~ NASA Ocean Biology Processing Group 12 Longwave SST dBT <= 0.5 sst = a00 + a01*BT11 + a02*dBT*bsst + a03*dBT*(1.0/  -1.0) dBT >= 0.9 sst = a10 + a11*BT11 + a12*dBT*bsst + a13*dBT*(1.0/  -1.0) 0.5 < dBt < 0.9 sstlo = a00 + a01*BT11 + a02*dBT*bsst + a03*dBT*(1.0/  -1.0) ssthi = a10 + a11*BT11 + a12*dBT*bsst + a13*dBT*(1.0/  -1.0) sst = sstlo + (dBT-0.5)/( )*(ssthi-sstlo) where: BT11 = brightness temperature at 11 um, in deg-C BT12 = brightness temperature at 12 um, in deg-C bsst = baseline SST, which is either sst4 (if valid) or sstref (from oisst) dBT = BT11 - BT12  = cosine of sensor zenith angle