Recent trends of the tropical hydrological cycle inferred from Global Precipitation Climatology Project and International Satellite Cloud Climatology Project data

摘要

Sslcpaohrrgeeerse, oaimnf dmp atohcdut esth ltiehn egg l sositbmuadul ilheaysted hdrao tvlroeegn sidchs oc owyfcn lse ut;hc hahot iwimnecpvraeecrat, ssd,i inesgva gegnrre efeeomnr ehrneotgusi sooenn gs raeasgse ilosa nringale t shacesa laes the tropics, remain uncertain. The present investigation attempts to examine such trends in the observations using satellite data products comprising Global Precipitation Climatology radioajteicotn p. rSepceipciiftaictiaollny a, nedv oIlnvtienrgn atrtieonndasl oSfa tthelel ittreo Cpilcoauld h Cydlirmolaotgoilcoagly c Pycroleje ocvt ecrl othued laansdt 30 years were identified and analyzed. The results show (1) intensification of tropical precipitation in the rising regions of the Walker and Hadley circulations and weakening over the sinking regions of the associated overturning circulation; (2) poleward shift of the subtropical dry zones (up to 2° decade~(-1) in June-July-August (JJA) in the Octtoohrbeteh Hre-raNndo lHveyeem mcbiirsecpru hilnea rttieho ean n;S dao nu0dt.h 3(e-3r0n). 7sHi°ge dnmeiifcsipacadhneert-I e pi)no c lJoeunwnsaiesr-tdJe unmlty iwg-Aritahut igaounns ot( v0ae.n9rda-1l lS. 7be°rpo tdaeedmceabndeinerg-~(-1))of cloud boundaries of Hadley cell and plausible narrowing of the high cloudiness in the e Intertropical Convergence Zone region in some seasons. These results support findings of some of the previous studies that showed strengthening of the tropical hydrological cycle and expansion of the Hadley cell that are potentially related to the ent global warming trends.