Plateau Meteorology

Plateau Meteorology >

2018 , Vol. 37 >Issue 2: 455 - 468

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00051

A Simulation Comparison Study on the Climatic Characteristics of the South Asia High by the BCC Climate System Model

  • DONG Min ,
  • WU Tongwen ,
  • ZUO Qunjie ,
  • GAO Shouting
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  • National climate center, 100081 Beijing, China;Institute of atmospheric physics, 100029 Beijing, China;National Key laboratory on disastrous weather, Chinese Academy of meteorological sciences, 100081 Beijing, China

Received date: 2017-02-09

  Online published: 2018-04-28

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Abstract

The simulation ability of BCC climate system model (BCC_CSM1.1) on climatic characteristics of the South Asia High is assessed by using the CMIP5/AMIP historical experiment output data. The results show that the BCC_CSM1.1 can pretty well simulate the mean state, ridge line position and the high pressure center of the South Asia High and their seasonal variation. The deficiencies of the model are the followings:The simulated height field is much weaker than observation, the model produced ridge line position is slightly more southward than observation in winter half year, the simulated high pressure centers have some differences in some months, for example, the simulated SAH center is more westward than observation in May, and in summer the dipole pattern of SAH center is also not well simulated. The weak simulation of SAH is related to many factors. It was found when the sea surface temperature is specified as observations, the error from AMIP run will reduce about 13%~15% compared with the results from coupled model. This means that the total error of the coupled model is mainly from atmosphere component. The improvement of ocean model would contribute only small part to total improvement. Comparing the error from T106 resolution model with that from T42 resolution model shows that the middle high resolution model has greatly reduced the simulation error of the SAH and global 100 hPa geopotential height field. To verify the effect of topography forcing on simulation results, some experiments with different topography of Qinghai-Tibetan Plateau were conducted. It is found the topography of Qinghai-Tibetan Plateau has significant influence on the strength of the SAH and global geopotential height field. The topography uprising of the Plateau could enhance the simulated SAH strength and global geopotential height field. This means that specifying the topography correctly would improve the model simulation results.

Key words： South Asia High; simulation; assessment

Cite this article

DONG Min , WU Tongwen , ZUO Qunjie , GAO Shouting . A Simulation Comparison Study on the Climatic Characteristics of the South Asia High by the BCC Climate System Model[J]. Plateau Meteorology, 2018 , 37(2) : 455 -468 . DOI: 10.7522/j.issn.1000-0534.2017.00051

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