Global Distribution of Different Forms of Convection as Seen by TRMM Robert A. Houze, Jr. University of Washington with: K. L. Rasmussen, M. D. Zuluaga,

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Presentation transcript:

Global Distribution of Different Forms of Convection as Seen by TRMM Robert A. Houze, Jr. University of Washington with: K. L. Rasmussen, M. D. Zuluaga, and S. R. Brodzik European Geosciences Union General Assembly, Vienna, Austria 17 April 2015

The TRMM Satellite Precipitation Radar Low altitude, low inclination orbit

Kummerow et al, 1998 > TRMM Instruments  = 2 cm PR: Precipitation Radar  = 2 cm Important! Radar measures 3D structure of radar echoes

ConvectiveStratiformOther TRMM algorithm divides the echoes

Convective cores land echo core 3D convective echo bounded by threshold dBZ TypeThresholdWidthHeight Shallow-isolated17 dBZ2 pixels< 5 km Deep-strong40 dBZ>10 km Deep-moderate30 dBZ> 8 km Wide-strong40 dBZ>1000 km 2 Wide-moderate30 dBZ>800 km 2

Shallow-isolated and Strong-deep in DJF

Deep and Wide in DJF

Broad stratiform regions TypeWidth Strong> 50,000 km 2 Moderate> 30,000 km 2 land Stratiform echo volume Look for ones that are broad and contiguous

Wide Convective and Broad Stratiform in DJF

Regions of Frequent Broad Stratiform

Mesoscale systems over the western Pacific warm pool

Mesoscale systems over the Bay of Bengal Open ocean Near coast

Frontal precipitation in subtropical latitudes

Forms of convection seen by TRMM Convective cores Shallow isolated echoes—oceanic Deep intense cores—continental Upscale growth of convection (“aggregation,” “organization”) Associated with less deep & intense conv. cores Stratiform development Wherever mesoscale aggregation occurs Mostly oceanic and semi-oceanic Less strong over land regions—where convection is strongest Stratiform structure Mesoscale system type—over open tropical oceans Weak cellular form—in ITCZ and monsoonal coastal regions Frontal—over subtropical oceans

END This research is supported by: NASA grant NNX13AG71G

Extra Slides

Satellite Geolocate Interpolate Re-map and interpolate the PR reflectivity field

Use remapped interpolated data to locate different types of 3D embedded echoes

1458GMT 13 May 2004 Convective Precipitation Stratiform Precipitation Radar echoes of convective storms contain two types of embedded features

Identify every contiguous 3D echo object (“storm”) seen by PR Convective component Stratiform component Extreme characteristic Contiguous 3D volume of convective echo > 40 dBZ Top height > 10 km “Deep convective core” Horizontal area > km 2 Horizontal area > km 2 “Wide convective core” Extreme characteristic Contiguous stratiform echo with horizontal area > km 2 “Broad stratiform region” Use TRMM to find the most pronounced convective & stratiform elements