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Title of Journal: Clim Dyn

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Abbravation: Climate Dynamics

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Springer Berlin Heidelberg

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DOI

10.1016/0098-3004(85)90095-0

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1432-0894

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Sensitivity of a regional climate model to land su

Authors: Wenkai Li Weidong Guo Yongkang Xue Congbin Fu Bo Qiu
Publish Date: 2015/12/29
Volume: 47, Issue: 7-8, Pages: 2293-2308
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Abstract

Land surface processes play an important role in the East Asian Summer Monsoon EASM system Parameterization schemes of land surface processes may cause uncertainties in regional climate model RCM studies for the EASM In this paper we investigate the sensitivity of a RCM to land surface parameterization LSP schemes for longterm simulation of the EASM The Weather Research and Forecasting WRF Model coupled with four different LSP schemes NoahMP CLM4 Pleim–Xiu and SSiB hereafter referred to as SimNoah SimCLM SimPX and SimSSiB respectively have been applied for 22summer EASM simulations The 22summer averaged spatial distributions and strengths of downscaled largescale circulation 2m temperature and precipitation are comprehensively compared with ERAInterim reanalysis and dense station observations in China Results show that the downscaling ability of RCM for the EASM is sensitive to LSP schemes Furthermore this study confirms that RCM does add more information to the EASM compared to reanalysis that imposes the lateral boundary conditions LBC because it provides 2m temperature and precipitation that are with higher resolution and more realistic compared to LBC For 2m temperature and monsoon precipitation SimPX and SimSSiB simulations are more consistent with observation than simulations of SimNoah and SimCLM To further explore the physical and dynamic mechanisms behind the RCM sensitivity to LSP schemes differences in the surface energy budget between simulations of EnsNoahCLM ensemble mean averaging SimNoah and SimCLM and EnsPXSSiB ensemble mean averaging SimPX and SimSSiB are investigated and their subsequent impacts on the atmospheric circulation are analyzed It is found that the intensity of simulated sensible heat flux over Asian continent in EnsNoahCLM is stronger than that in EnsPXSSiB which induces a higher tropospheric temperature in EnsNoahCLM than in EnsPXSSiB over land The adaptive modulation of geopotential height gradients affects wind field through geostrophic balance simulation especially at lower levels which subsequently affects the simulation of largescale circulation 2m temperature and monsoon precipitation as well as RCM’s downscaling abilityThis research is jointly sponsored by the National Natural Science Foundation of China Grant No 41475063 the National Basic Research Program of China 2011CB952002 US NSF Grant AGS1419526 and Program for New Century Excellent Talents in University This work is also supported by the Jiangsu Collaborative Innovation Center for Climate Change The WRF source codes are obtained at http//www2mmmucaredu/wrf/users/download/get sourceshtml The NCEPR2 is available at http//rdaucaredu/datasets/ds0910/ The ERAinterim is available at http//appsecmwfint/datasets/data/interimfulldaily The China Ground 2m Temperature and Precipitation Grid Dataset is available at http//cdcnmiccn All figures were produced using NCAR Command Language NCL version 630 open source software free to public by UCAR/NCAR/CISL/TDD http//dxdoiorg/105065/D6WD3XH5

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