Liang Liao Goddard Earth Sciences & Technology Research Morgan State University Greenbelt, MD 20771 Robert Meneghini NASA/Goddard Space Flight Center Greenbelt,

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Presentation transcript:

Liang Liao Goddard Earth Sciences & Technology Research Morgan State University Greenbelt, MD Robert Meneghini NASA/Goddard Space Flight Center Greenbelt, MD Evaluation of TRMM Precipitation Radar for Estimates of Surface Rainfall Rate

Objectives IGARSS 2011 Vancouver Validating TRMM PR Measurements –Compare with the well-calibrated non- attenuated ground-based radar measurements. Examining TRMM PR Algorithms –Rain attenuation correction –Rain rate estimation –Version-7 vs. Version-6

IGARSS 2011 Vancouver WSR-88D Ground-Based Radar

IGARSS 2011 Vancouver Earth Coordinate System Schematic diagram of the earth coordinate system in which the latitude, , and longitude,, are defined.

IGARSS 2011 Vancouver Geometry for correction of PR offsets (  x and  y) in x and y axes at a height of h.

IGARSS 2011 Vancouver Radar Measurements (3/9/1998)

IGARSS 2011 Vancouver PR vs. WSR-88D in Melborne

IGARSS 2011 Vancouver Radar Reflectivity (3/9/1998) h = 1.5 km h = 3 km

IGARSS 2011 Vancouver Radar Reflectivity at h=7.5 ( )

IGARSS 2011 Vancouver Radar Reflectivity at h=1.5 ( )

IGARSS 2011 Vancouver Scatter Plots of Mean Reflectivity (h=3 km)

IGARSS 2011 Vancouver Scatter Plots of Rain ( )

IGARSS 2011 Vancouver Scatter Plots of Mean Rain ( )

IGARSS 2011 Vancouver Area-Averaged Rain WSR-88D TRMM PR

IGARSS 2011 Vancouver Area-Averaged Rain ( )

IGARSS 2011 Vancouver Scatter Plots of Mean Reflectivity ( ) PR (v6) vs. WSR-88D at a height of 3.0 km in MELB PR (v7) vs. WSR-88D at a height of 3.0 km in MELB

IGARSS 2011 Vancouver Scatter Plots of Mean Rain ( ) PR (v6) vs. WSR-88D in MELB PR (v7) vs. WSR-88D in MELB

IGARSS 2011 Vancouver Relative Biases ( )

IGARSS 2011 Vancouver Relative Bias ( )

Comparisons of the PR-derived reflectivities and rain rates with the same quantities derived from near-simultaneous measurements by the WSR-88D ground-based Melbourne radar are presented for more than 230 overpasses during The reflectivity fields derived from the PR data after attenuation correction, and the conditional mean and area- averaged rain rates from the PR agree well with those obtained from the WSR-88D. Improvement of rain estimates is found from PR version-6 to version-7 standard products. Further comparisons will be conducted in the future as more data become available and these procedures will be extended to the other climatological sites. Summary IGARSS 2011 Vancouver