verification of mirs cloud retrievals with cloudsat and a rain rate algorithm based on mspps
DESCRIPTION
Verification of MIRS Cloud Retrievals with CLOUDSAT and a Rain Rate Algorithm based on MSPPS. F. Iturbide-Sanchez, K. Garrett, W. Chen and S.-A. Boukabara. MIRS. TRMM. ECMWF. CLOUDSAT. External Data Products To Use For Assessment of MIRS Hydrometeor Products. CLWC/CIWC and Rain Rate. - PowerPoint PPT PresentationTRANSCRIPT
F. Iturbide-Sanchez
Aug 08, 2008
Verification of MIRS Cloud Retrievals with CLOUDSAT and a Rain Rate
Algorithm based on MSPPS
F. Iturbide-Sanchez, K. Garrett, W. Chen and S.-A. Boukabara
F. Iturbide-Sanchez
Aug 08, 2008
MIRS
ECMWFCLOUDSAT
TRMM
External Data Products To Use For Assessment of MIRS Hydrometeor Products
CLWC/CIWCCLWC/CIWC
CLWC/CIWC and Rain Rate
F. Iturbide-Sanchez
Aug 08, 2008
CLOUDSAT Overview
•The Cloud Profile Radar (CPR) is the primary CloudSat instrument.
•The CPR is a 94-GHz nadir-looking radar which measures the power backscattered by clouds as a function of distance from the radar.
• Footprint match : ~1 km
• Profile data available every 0.2 s approx.
• Retrieved products of interest: CLWC and CIWC
F. Iturbide-Sanchez
Aug 08, 2008
CLOUDSAT and NOAA-18 Collocation
NOAA 18 CLOUDSAT
00:44:53 GMT 00:44:47 GMT
• Collocation was performed from Jun-10-2008 to Jun-16-2008.
• Distance and time threshold were set to about 50 km and 10 min, respectively.
• Three days, Jun-11-2008, Jun-13-2008 and Jun-15-2008, showed ~7500 collocation points per day.
• About 60% of the collocation cases occurred over ocean and 20% over land.
F. Iturbide-Sanchez
Aug 08, 2008
Global-CLWP Global-IWP
Comparison between CLOUDSAT and MIRS-NOAA-18 Hydrometeors
F. Iturbide-Sanchez
Aug 08, 2008
Ocean-CLWP Ocean-IWP
Comparison between CLOUDSAT and MIRS-NOAA-18 Hydrometeors
F. Iturbide-Sanchez
Aug 08, 2008
Comparison between CLOUDSAT and MIRS-NOAA-18 Hydrometeors
Land-CLWP Land-IWP
F. Iturbide-Sanchez
Aug 08, 2008
Comparison between ECMWF and MIRS-NOAA-18 Hydrometeors
Ocean-CLWP Land-CLWP
F. Iturbide-Sanchez
Aug 08, 2008
Histogram Comparison between CLOUDSAT and MIRS-NOAA-18 Hydrometeors
F. Iturbide-Sanchez
Aug 08, 2008
Day
LWC correlation IWC correlation
GlobalOcean(~60%)
Land (~20%)
GlobalOcean(~60%)
Land (~20%)
Jun-11-2008 0.376 0.476 0.116 0.031 0.029 0.039
Jun-13-2008 0.316 0.521 0.135 0.332 0.085 0.435
Jun-15-2008 0.342 0.469 0.164 0.191 0.185 0.239
Correlation Values Between CLOUDSAT and MIRS-NOAA-18 Hydrometeors
F. Iturbide-Sanchez
Aug 08, 2008
Rain Rate Algorithm Based on MSPPS
Rain Rate
TPW-MSPPS
CLW-MSPPS
IWP-MSPPS
Emissivities-MIRS
Skin Temp.-MIRS
Main Input Parameters
F. Iturbide-Sanchez
Aug 08, 2008
Comparison between the operational MSPPS and the Implemented Rain Rate Algorithm
Operational MSPPS Products-NOAA18http://www.osdpd.noaa.gov/PSB/IMAGES/noaa18prd.html
MIRS-MSPPS
F. Iturbide-Sanchez
Aug 08, 2008
Comparison between the operational MSPPS and the Implemented Rain Rate Algorithm
Operational MSPPS Products-NOAA18http://www.osdpd.noaa.gov/PSB/IMAGES/noaa18prd.html
MIRS-MSPPS
F. Iturbide-Sanchez
Aug 08, 2008
Rain Rate
TPW-MIRS
CLW-MIRS
IWP-MIRS
Emissivities-MIRS
Skin Temp.-MIRS
Rain Rate Algorithm Based on MSPPS
Main Input Parameters
F. Iturbide-Sanchez
Aug 08, 2008
Comparison between the operational MSPPS and the Implemented Rain Rate Algorithm
Operational MSPPS Products-NOAA18http://www.osdpd.noaa.gov/PSB/IMAGES/noaa18prd.html
MIRS-MSPPS
F. Iturbide-Sanchez
Aug 08, 2008
Summary
• For three days of collocation between CloudSat and NOAA-18, approximately 60% of the collocation cases occurred over ocean and 20% over land.
• Statistical comparisons between CLW derived from CloudSat and MIRS-NOAA18 show correlation values of about 0.5 over ocean and 0.15 over land. For IWC the correlation over ocean varies from 0.03 to 0.19 and 0.04 to 0.43 over land.
• Comparisons between CLW derived from CloudSat and MIRS-NOAA18 have shown similar results than ECMWF-MIRS statistical comparison.
• The results from the implemented rain rate algorithm show rain rate values comparable to the ones reported by the operational MSPPS, particularly over land. However, underestimation of the rain rate is observed over ocean particularly over the tropical region.
F. Iturbide-Sanchez
Aug 08, 2008
Future Work
• An optimization to the collocation program will be performed in order to reduce its processing time.
• Statistical comparisons between CloudSat and MIRS Hydrometeors will be available on daily basis.
• Comparison between TRMM and MIRS Hydrometeors will be started, with particular emphasis on the hydrometeors.