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Satellite‐based monitoring of intraseasonal variations in tropical Pacific and Atlantic convection
Author(s) -
Evans Jenni L.,
Jaskiewicz Francine A.
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl011259
Subject(s) - madden–julian oscillation , climatology , convection , tropical cyclone , satellite , atlantic hurricane , tropical cyclogenesis , geology , cyclogenesis , environmental science , meteorology , geography , cyclone (programming language) , field programmable gate array , computer science , computer hardware , aerospace engineering , engineering
An automated Convection Classification, Analysis and Tracking Scheme (CCATS) is used to diagnose spatial and temporal variability of convection in the tropical western Pacific and Atlantic Oceans. Three organized convection classes are differentiated; degree of organization is related to lifetime, symmetry and peak system size. A fourth category of short‐lived thunderstorms is also detected. Two cycles of the Madden Julian Oscillation (MJO) are tracked across the Pacific basin. The degree of organization of the convective systems increases as the MJO progresses through the region, preconditioning the environment for tropical cyclogenesis. Satellite‐inferred rainfall budgets reveal that tropical western Pacific and Atlantic rainfall is dominated by organized convection. This has potentially important implications for representation of the hydrologic cycle in numerical simulations of the tropics, particularly for models that do not explicitly resolve the mesoscales.