SLIDE 1 GEWEX WATER VAPOR ISSUES
- OLR too low in subtropics (upper atmosphere
too moist)
- TOA LW CRE depends on profile of WV
- SST and LST retrieval sensitive to Qa (mostly),
especially in low latitudes
- SRF netLW sensitive to Qa
- SRF E sensitive to Qa
- Water budget: Synoptic ∂Q/∂t or divQ with P-E
- Layer - ∂Q/∂t and Convection
SLIDE 2
ISCCP—nnHIRS
SLIDE 3
ISCCP--nnHIRS QUANTITIES
Temperature (Kelvins) at Surface (“2m”), 900, 800, 740, 680, 620, 560, 500, 440, 380, 320, 260, 200, 150, 100, 50, 10 mb Tropopause Pressure/Temperature, Surface Pressure/Temperature and Maximum Temperature at a Pressure (peak of surface inversion or highest level reported for isothermal layer) Percent Relative Humidity at Surface (“2m”), 900, 800, 740, 680, 620, 560, 500, 440, 380, 320, 260, 200, 150, 100, 50, 10 mb -- (0.5 – 110% relative to Liquid at T ≥ 273 K, 0.5 – 150% relative to Ice at T < 273 K, added SWOOSH) ** Layers below the surface report -1000, Maximum Surface Pressure = 1019 mb; Minimum Tropopause Pressure = 100 mb
SLIDE 4
SAMPLING ISSUE
SLIDE 5
TIMELINE OF NUMBER OF SATELLITES AVAILABLE EACH MONTH
1 2 3 4 1980 2010
SLIDE 6
OLD PROCEDURE -- 2 sats
SLIDE 7
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SLIDE 11
Percent Frequency of NO Tropopause (divided by 10)
SLIDE 12
Recent Results Indicate PT as small as 80 mb
SLIDE 13 nnHIRS PROCESSING
- INPUT into 1° equal-area map for 24 LST per day
- VERTICAL INTERPOLATION (adjust PS)
- HORIZONTAL FILL
– Zonal interpolation (± 5) – Meridional interpolation (± 3)
- Calculate (bias-corrected) DAILY MEAN
- INTERPOLATE Daily Means (± 5 days, mon, climo)
- DIURNAL (PCA) OR LINEAR INTERPOLATION
- Combine with SWOOSH (interpolate)
SLIDE 14
nnHIRS MEAN = 11.1 g/kg MEAN DIFF = +0.02 g/kg STD DEV DIFF = 1.6 g/kg nnHIRS – AIRS Specific Humidity at 1013 mb (g/kg)
SLIDE 15
nnHIRS MEAN = 3.5 g/kg MEAN DIFF = +0.5 g/kg STD DEV DIFF = 0.7 g/kg nnHIRS – AIRS Specific Humidity at 680 mb (g/kg)
SLIDE 16
Our limits are 0.5% and 110% (liq) or 150% (ice) 0.77% with RH > 200% and 18% with RH < 0.5%
RHA
SLIDE 17
Map of frequency of re-set for RHA
SLIDE 18
Our limits are 0.5 % and 150% 18% with RH > 200% and 0.07% with RH < 0.5% Recent Results indicate RH100 as much as 170%
RH300
SLIDE 19
Map of frequency of re-set for RH380
SLIDE 20
“Diurnal” Amplitude of Qa
SLIDE 21
SAHARA Q VALUES
SLIDE 22
SOBS 1-4
SLIDE 23
Collapse of Weighting Functions
SLIDE 24 Q for near surface 2 year period – August Amplitude of the fitted data (what goes into the PCA if used)
“Diurnal” Qa Variation
SLIDE 25
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SLIDE 31 Calibration Issue
- Looks like no problem at warm end but still
a problem at cool end ???
SLIDE 32
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SUMMER MIDLATITUDE LAND
SLIDE 34 40 N , 150 E
SUMMER MIDLATITUDE OCEAN
SLIDE 35
JANUARY 2002-2004 MEAN TS (+1) – TA during DAY
SLIDE 36
JANUARY 2002-2004 MEAN TS (+1) – TA during NIGHT
SLIDE 37 AUG DAY AUG NIGHT JAN DAY JAN NIGHT
SLIDE 38
ARCTIC WINTER INVERSION
1989 01 GMT 0
SLIDE 39
PROFILE OVER HIGH TOPOGRAPHY
Antarctica, 1989 01 GMT 0
SLIDE 40 Lat 20 N, long 50 E NNHIRS GMT 6, GMT 21
DESERT DAY & NIGHT
SLIDE 41
“Diurnal” Amplitude
SLIDE 42
“Diurnal” Amplitude
