GOES-R LST VALIDATION:

ASSESSEMENT OF VALUE OF SURFACE AIR TEMPERATURE (SAT) OBSERVED AT

CRN STATIONS FOR GOES RETREIVED LST VALIDATION

(Land Team)

Kostya Vinnikov January 6, 2010

Question: CAN WE USE CRN OBSERVED HOURLY SAT TO VALIDATE GOES-R RETRIEVED CLEAR SKY LST?

Data:

2004-2005 HOURLY OBSERVATIONS AT LOCATIONS OF THREE COINSIDED CRN/SURFRAD STATIONS:

LST & SAT OBSERVATIONS AT CRN LST AT SURFRAD & GOES-10

•DESERT ROCK, NV•FORT PECK, MT•BONDVILLE, IL

Answer: NO

Raw Differences in HOURLYLST( GOES-10) – SAT(CRN) Mean=4.4K, σ=6.2 K. Adjusted σ=1.8 K

Raw Differences in HOURLYLST(GOES-10) – LST(SURFRAD)Mean=-1.8 K, σ=1.1 K. Adjusted σ=0.9 K

Raw Differences in HOURLYLST(GOES-10) - LST(CRN)Mean=-0.1, σ=1.4 K. Adjusted σ=0.9 K

Diurnal/Seasonal cycles in observed LST /SAT estimated from 2004-2005 observations at GOES-10, SURFRAD, & CRN

2234 Clear Sky hours

Raw Differences in HOURLYLST( CRN) – SAT(CRN) Mean=4.5K, σ=5.2 K. Adjusted σ=1.5 K

DIURNAL/SEASONAL ADJUSTMENTS for RAW Validation DIFFERENCES IN HOURLY LST/SAT OBSERVED at GOES-10, SURFRAD, & CRN.Estimated from 2004-2005 data

σ=0.9 K

σ=0.9 K

σ=1.8 K

σ=1.5 K

Raw Differences in HOURLYLST(GOES-10) – LST(SURFRAD).Mean=-2.2 K, σ=1.3 K. Adjusted σ=1.2 K

Raw Differences in HOURLYLST(GOES-10) – LST(CRN)Mean=-1.9 K, σ=1.5 K. Adjusted σ=1.2 K

Raw Differences in HOURLY LST(GOES-10) – SAT(CRN)Mean=-0.5 K, σ=4.1 K. Adjusted σ=1.9 K

1439 Clear Sky hours

Raw Differences in HOURLYLST(GOES-10) - SAT(CRN)Mean=1.4, σ=3.9 K. Adjusted σ=1.7 K

Diurnal/Seasonal cycles in observed LST/SAT estimated from 2004-2005 observations at GOES-10, SURFRAD, & CRN

DIURNAL/SEASONAL ADJUSTMENTS for RAW Validation DIFFERENCES IN HOURLY LST/SAT OBSERVED at GOES-10, SURFRAD, & CRN.Estimated from 2004-2005 data

σ=1.2 K

σ=1.2 K

σ=1.9 K

σ=1.7 K

1276 Clear Sky hours

Diurnal/Seasonal cycles in observed LST/SAT estimated from 2004-2005 observations at GOES-10, SURFRAD, & CRN

Raw Differences in HOURLY LST(GOES-10) - LST(SURFRAD)Mean=-1.4 K, σ=1.7 K. Adjusted σ=1.3 K

Raw Differences in HOURLYLST(GOES-10) - LST(CRN)Mean=-0.8 K, σ=1.9 K. Adjusted σ=1.6K

Raw Differences in HOURLYLST(GOES-10) – SAT(CRN)Mean=-1.6 K, σ=2.9 K. Adjusted σ=1.5 K

Raw Differences in HOURLYLST(CRN) – SAT(CRN)Mean=-0.8, σ=3.0 K. Adjusted σ=1.4 K

σ = 1.3 K

Diurnal/Seasonal cycles in observed LST/SAT estimated from 2004-2005 observations at GOES-10, SURFRAD, & CRN

σ = 1.6 K

σ = 1.5 K

σ = 1.4 K

DESERT ROCK, NV

FORT PECK, MT

BONDVILLE, IL

LST(SURFRAD) 0.9 K 1.2 K 1.3 K

LST(CRN) 0.9 K 1.2 K 1.6 K

SAT(CRN) 1.8 K 1.9 K 1.5 K

STANDARDS of LST(GOES-10) VALIDATION DIFFERENCES

ADJUSTED DIFFERENCES

DESERT ROCK, NV

FORT PECK, MT

BONDVILLE, IL

LST(SURFRAD) 1.1 K 1.3 K 1.7 K

LST(CRN) 1.4 K 1.5 K 1.9 K

SAT(CRN) 6.2 K 4.1 K 2.9 K

RAW DIFFERENCES

CONCLUSION BASED ON TWO YEAR LST/SAT OBSERVATIONS AT THREE COLOCATED CRN AND

SURFRAD STATIONS AND GOES-10 LST DATA

•SURFRAD OBSERVED LST IS the BEST for VALIDATION of GOES OBSERVED LST

•CRN OBSERVED LST CAN BE USED for VALIDATION of GOES OBSERVED CLEAR SKY LST.

•CRN OBSERVED SAT CANNOT BE USED for VALIDATION of GOES OBSERVED CLEAR SKY LST.