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Climatology of contribution-weighted tropical rain rates based on TRMM 3B42

Venugopal, V and Wallace, JM (2016) Climatology of contribution-weighted tropical rain rates based on TRMM 3B42. In: GEOPHYSICAL RESEARCH LETTERS, 43 (19). pp. 10439-10447.

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Official URL: http://dx.doi.org/10.1002/2016GL069909

Abstract

The climatology of annual mean tropical rain rate is investigated based on merged Tropical Rainfall Measuring Mission (TRMM) 3B42 data. At 0.25 degrees x0.25 degrees spatial resolution, and 3-hourly temporal resolution, half the rain is concentrated within only approximate to 1% of the area of the tropics at any given instant. When plotted as a function of logarithm of rain rate, the cumulative contribution of rate-ranked rain occurrences to the annual mean rainfall in each grid box is S shaped and its derivative, the contribution-weighted rain rate spectrum, is Gaussian shaped. The 50% intercept of the cumulative contribution R-50 is almost equivalent to the contribution-weighted mean logarithmic rain rate RL are similar to those obtained by mapping the fraction of the annual accumulation explained by rain occurrences with rates above various specified thresholds. The geographical distribution of R-50 confirms the existence of patterns noted in prior analyses based on TRMM precipitation radar data and reveals several previously unnoticed features.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Depositing User: Id for Latest eprints
Date Deposited: 07 Dec 2016 05:05
Last Modified: 07 Dec 2016 05:05
URI: http://eprints.iisc.ac.in/id/eprint/55475

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