TITLE

Diurnal cycles of precipitation over subtropical China in IPCC AR5 AMIP simulations

AUTHOR(S)
Yuan, Weihua
PUB. DATE
November 2013
SOURCE
Advances in Atmospheric Sciences;Nov2013, Vol. 30 Issue 6, p1679
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Atmospheric Intercomparison Project simulations of the summertime diurnal cycle of precipitation and low-level winds over subtropical China by Intergovernmental Panel on Climate Change Fifth Assessment Report models were evaluated. By analyzing the diurnal variation of convective and stratiform components, results confirmed that major biases in rainfall diurnal cycles over subtropical China are due to convection parameterization and further pointed to the diurnal variation of convective rainfall being closely related to the closure of the convective scheme. All models captured the early-morning peak of total rainfall over the East China Sea, but most models had problems in simulating diurnal rainfall variations over land areas of subtropical China. When total rainfall was divided into stratiform and convective rainfall, all models successfully simulated the diurnal variation of stratiform rainfall with a maximum in the early morning. The models, overestimating noon-time (nocturnal) total rainfall over land, generally simulated too much convective rainfall, which peaked close to noon (midnight), sharing some similarities in the closures of their deep convection schemes. The better performance of the Meteorological Research Institute atmosphere-ocean coupled global climate model version 3 (MRI-CGCM3) is attributed to the well captured ratio of the two kinds of rainfall, but not diurnal variations of the two components. Therefore, a proper ratio of convective and stratiform rainfall to total rainfall is also important to improve simulated diurnal rainfall variation.
ACCESSION #
91528173

 

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