1 Status of ARM Best Estimate Product CrIS EDR Cal/Val Telecon 7-May-2013 L. Borg, D. Tobin, R....
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Transcript of 1 Status of ARM Best Estimate Product CrIS EDR Cal/Val Telecon 7-May-2013 L. Borg, D. Tobin, R....
1
Status of ARM Best Estimate Product
CrIS EDR Cal/Val Telecon7-May-2013
L. Borg, D. Tobin, R. Knuteson, N. R. Nalli
with support from our ARM partners …
Donna Holdridge, Jenni Kyrouac, Jim Mather, Douglas Sisterson
2
ARM Best Estimate Sonde Product
Overview:ARM data is being collected at NSA, SGP, & TWP-Manus to validate NPP CrIMSS EDRs
• NSA & SGP: sondes launched 45 minutes prior and 5 minutes prior to overpass• TWP: single sonde launched 15 minutes prior to overpass
Zeroth Order Processing:• Sondes are interpolated onto common pressure grid• MWR PWV scaling applied to sonde RHs & WV mixing ratios• Sondes interpolated to overpass time• Data written to netcdf
Time [UTC}
Example Sonde Pair Launch Timing
Pres
sure
[hPa
]Primary ARM data products used:• sondewnpn: RS-92 balloon-borne sounding
system: Vaisala-processed• mwrlos: microwave radiometer: water liq, &
vapor along los path
Status Phase-1 Sonde Launches
ARM-NSA ARM-SGP ARM-TWPLocation Barrow, Alaska, USA Ponca City,
Oklahoma, USAManus Island, Papua New Guinea
Regime Polar Continent Midlatitude Continent, Rural
Tropical Pacific Warm Pool, Island
Planned N 180 180 90
Launched n1 90 89 78
Launched n2 90 89 ---
Time Frame Jul - Dec 2012 Jul 2012 - Jan 2013 Jul 2012 – May 2013
• Sondes completed at NSA & SGP, but ongoing at TWP-Manus
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Temperature [K]
Pres
sure
[mb]
NSA
Temperature [K]
SGP
Pres
sure
[mb]
Temperature [K]
TWP-Manus
Pres
sure
[mb]
Sonde Profiles
H2O[g/kg]
Pres
sure
[mb]
Approximate Overpass Times•13:00 UTC (04:00 AKST)•21:00 UTC (12:00 AKST)
H2O[g/kg]
Pres
sure
[mb]
Approximate Overpass Times• 08:00 UTC (02:00 CST)• 19:00 UTC (13:00 CST)
• Limited collection sites, but representing a wide range of climatic conditions• Highly accurate measurements
4H2O[g/kg]
Pres
sure
[mb]
Approximate Overpass Times• 03:00 UTC (13:00 PGT)• 15:00 UTC (01:00 PGT)
Pres
sure
[mb]
Altit
ude
[km
]
Interpolated Sondes
5
NSA
5
Sample MWR Measurements: NSA
Time [UTC]
Pres
sure
[mb]
NSA Overpass: 29-Jul-2012 21:31:26 UTC
Time [UTC]
pwv
[cm
]lw
p [c
m]
MWR Data
Time [UTC]
Time [UTC] versus MWR Scale Factor at NSA: mean_mwrsf = 1.018
mwr scale factor
mean=1.018
mwr scale factor
mean=1.0348
mwr scale factor
mean=1.0239
Time [UTC]
mw
r sca
le fa
ctor
NSA
Time [UTC]
mw
r sca
le fa
ctor
SGP
Time [UTC]
mw
r sca
le fa
ctor
TWP
MWR Scale Factors
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• Mean MWR scale factors are close to 1
meanstdev
H2O Difference [g/kg] H2O Difference [g/kg]
Temperature Difference [K]Temperature Difference [K]
Pres
sure
[mb]
NSA SGP
Pres
sure
[mb]
Pres
sure
[mb]
Pres
sure
[mb]
Differences Between Sonde Pairs
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• This analysis does not follow the official 1km/2km layering methodology for reporting statistics
• SGP - The variability in temperature that occurs within 45 minutes is 1°K
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CrIMSS GDAS
CrIMSS and GDAS Matchup
H2O [g/kg]
Pres
sure
[mb]
• This analysis does not follow the official 1km/2km layering methodology for reporting statistics
Pres
sure
[mb]
Temperature [K]
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CrIMSS GDAS
Temperature [K]
Pres
sure
[mb]
RH [%]
Pres
sure
[mb]
CrIMSS and GDAS Matchup
• This analysis does not follow the official 1km/2km layering methodology for reporting statistics
meanstdev
ARMBE Comparisons with CrIMSS & GDAS
Temperature Difference [K]
Pres
sure
[mb]
NSA
ARMBE-CrIMSS
Temperature Difference [K]
Pres
sure
[mb]
ARMBE-GDAS
Temperature Difference [K]
SGP
Pres
sure
[mb]
ARMBE-CrIMSS
Pres
sure
[mb]
Temperature Difference [K]
ARMBE-GDAS
TWP
Temperature Difference [K]
ARMBE-CrIMSS
Pres
sure
[mb]
Temperature Difference [K]
ARMBE-GDAS
Pres
sure
[mb]
10
• Analysis uses CrIMSS EDRs with MX Version 5.3 - 6.5• This analysis does not follow the official 1km/2km layering methodology for reporting
statistics
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Next Steps
• ARMBE v0p0 product was distributed internally December 26, 2012
• ARMBE v0p1 product will be distributed to team within the week• Zeroth Order ARMBE product including recent TWP-Manus sondes• Updated sonde averaging scheme• Updated figures• Additional variables saved to netcdf
• ARMBE v1 product under development • Use gdas data in sonde interpolation and to account for scene spatial
variability• Perform vertical averaging and resolution reduction using official 1km/2km
methodology• Use CrIMSS EDRs with more recent MX versions• Include cloud height information
• We recommend that Phase-2 of the sonde launches begin