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The Relationship between Model Biases in East Asian Summer Monsoon Rainfall and Land Evaporation

Advances in Atmospheric Sciences 2023年第11期40卷 2029-2042,I0004-I0013页

作者： Ruth GEEN Marianne PIETSCHNIG Shubhi AGRAWAL dipanjan dey FHugo LAMBERT Geoffrey KVALLIS School of Geography Earth and Environmental SciencesUniversity of BirminghamBirmingham B152TTUK Department of Mathematics and Statistics University of ExeterExeter EX44QJUK Department of Earth and Environmental Sciences Indian Institute of Science Education and ResearchBhopal 462066India School of Ocean and Earth Science University of SouthamptonSouthampton SO171BJUK

The East Asian Summer Monsoon(EASM)provides the majority of annual rainfall to countries in East *** state-of-the-art models broadly project increased EASM rainfall,the spread of projections is large and simulations of present-day rainfall show significant climatological *** evapotranspiration biases occur locally over East Asia,and globally over land,in simulations both with and without a coupled *** study explores the relationship between evapotranspiration and EASM precipitation ***,idealized model simulations are presented in which the parameterization of land evaporation is modified,while sea surface temperature is *** results suggest a feedback whereby excessive evapotranspiration over East Asia results in cooling of land,a weakened monsoon low,and a shift of rainfall from the Philippine Sea to China,further fueling ***-model regressions against evapotranspiration over China indicate a similar pattern of behavior in Atmospheric Model Intercomparison Project(AMIP)*** causes of this pattern are *** feedback is not explained by an overly intense global hydrological cycle or by differences in radiative *** of land-only simulations indicates that evapotranspiration biases are present even when models are forced with prescribed *** are strengthened when coupled to the atmosphere,suggesting a role for land-model errors in driving atmospheric *** atmosphere-ocean models are shown to have similar evapotranspiration biases to those in AMIP over China,but different precipitation biases,including a northward shift in the ITCZ over the Pacific and Atlantic Oceans.

关键词： monsoon East Asia China evapotranspiration model bias

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