双月刊

ISSN 1006-9895

CN 11-1768/O4

亚洲季风降水季节演变特征的气候系统模式模拟:基于FGOALS-g3和FGOALS-g2的比较评估
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大气物理研究所

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国家重点研发计划


Seasonal Evolution of Asian Monsoon Precipitation Simulated by Climate System model: Based on the Comparative Evaluation Between FGOALS-g3 and FGOALS-g2
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The Institute of Atmospheric Physics,Chinese Academy of Sciences

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    摘要:

    亚洲季风降水的季节演变对亚洲农业生产和社会经济有重要的影响。本文通过与观测资料对比,评估了中国科学院大气物理研究所研发的最新版本的气候系统模式FGOALS-g3相对于上一版本FGOALS-g2对亚洲季风降水季节演变的模拟能力,并通过与FGOALS-g3海温驱动的大气模式结果对比,研究海气相互作用对季风降水年循环模拟的影响。结果表明,FGOALS-g3提高了对南亚和西北太平洋降水年循环的模拟能力,部分源于大气模式的改进,但对其他区域模拟性能改进不明显。FGOALS-g3对西北太平洋季风爆发、撤退、峰值和持续时间、阿拉伯海东部季风撤退和持续时间以及印度半岛至南海季风峰值时间的模拟偏差有所改进,且考虑模式自身海气耦合过程后,可显著改善西北太平洋区域降水年循环等模拟偏差。与FGOALS-g2相比,在南亚和中南半岛区域,FGOALS-g3模拟的季风爆发更晚,这是由非洲大陆降水干偏差导致索马里越赤道急流减弱,加剧该区域5月负降水偏差导致。在西北太平洋,FGOALS-g3显著改善了季风爆发西侧推迟而东侧提前的模拟偏差,原因是太平洋东暖西冷的海温偏差显著减小,局地Hadley环流增强,在该区域产生异常下沉运动,减小了西侧1月降水湿偏差,使5月相对于1月的降水量增加,而东侧5月降水与1月降水的干偏差得以互相抵消。研究表明热带大尺度海温型模拟偏差的改进对提高亚洲季风降水年循环的模拟能力有重要作用。

    Abstract:

    The seasonal evolution of the Asian monsoon precipitation is crucial to Asian agriculture production and social economy. Based on the observations, we assess the performances of latest version of the IAP/LASG Flexible Global Ocean-Atmosphere (FGOALS-g3) compared with FGOALS-g2 in simulating the Asian monsoon seasonal evolution. Compared with a atmospheric experiment driven by historical monthly mean FGOALS-g3 SST, the influence of air-sea coupling on monsoon seasonal evolution is also studied. The results show that FGOALS-g3 has improved the ability to simulate the precipitation annual cycle in South Asia and the Northwest Pacific region which may be relevant to single atmospheric models, but does not improve in other regions. The biases of precipitation annual cycle and timing of monsoon from South Asian to Northwest Pacific and precipitation annual cycle in South East Asian are improved by air-sea coupling process. Compared with FGOALS-g2, the ability to simulate Northwest Pacific monsoon onset and withdrawal, Arabian Sea monsoon withdrawal and from Indian Peninsula to the South China Sea monsoon peak are significantly improved in FGOALS-g3. The delayed bias onset in South Asia and Indo-China Peninsula is increased in FGOALS-g3 relative to FGOALS-g2, which is associated with weak Somali jet caused by dry bias in African land at May. In the Northwest Pacific, the bias of monsoon onset simulation (delayed in the West and advanced in the East) is significantly reduced in FGOALS-g3, mainly because the SST bias in tropical Pacific is improved, and the local Hadley circulation is strengthened, resulting in anomalous subsidence in the region, which reduces the wet bias in January on the west side, the relative precipitation increases, and the improvement of wet bias in the East is the result of compensation between the dry biases in May and January. The improvement of the tropical SST pattern in the coupled model has great implication to improve the simulation ability of the Asian monsoon precipitation annual cycle.

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  • 收稿日期:2021-08-05
  • 最后修改日期:2021-10-20
  • 录用日期:2021-10-25
  • 在线发布日期: 2021-11-17
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