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曾刚, 孙照渤, 林朝晖, 等. 不同海域海表温度异常对西北太平洋副热带高压年代际变化影响的数值模拟研究[J]. 大气科学, 2010, 34(2): 307-322. DOI: 10.3878/j.issn.1006-9895.2010.02.06
引用本文: 曾刚, 孙照渤, 林朝晖, 等. 不同海域海表温度异常对西北太平洋副热带高压年代际变化影响的数值模拟研究[J]. 大气科学, 2010, 34(2): 307-322. DOI: 10.3878/j.issn.1006-9895.2010.02.06
ZENG Gang, SUN Zhaobo, LIN Zhaohui, et al. Numerical Simulation of Impacts of Sea Surface Temperature Anomaly upon the Interdecadal Variation in the Northwestern Pacific Subtropical High[J]. Chinese Journal of Atmospheric Sciences, 2010, 34(2): 307-322. DOI: 10.3878/j.issn.1006-9895.2010.02.06
Citation: ZENG Gang, SUN Zhaobo, LIN Zhaohui, et al. Numerical Simulation of Impacts of Sea Surface Temperature Anomaly upon the Interdecadal Variation in the Northwestern Pacific Subtropical High[J]. Chinese Journal of Atmospheric Sciences, 2010, 34(2): 307-322. DOI: 10.3878/j.issn.1006-9895.2010.02.06

不同海域海表温度异常对西北太平洋副热带高压年代际变化影响的数值模拟研究

Numerical Simulation of Impacts of Sea Surface Temperature Anomaly upon the Interdecadal Variation in the Northwestern Pacific Subtropical High

  • 摘要: 采用1950~2000年逐月观测的不同海域(全球、热带外、热带、热带印度洋-太平洋、热带印度洋及热带太平洋) 海表温度分别驱动NCAR CAM3全球大气环流模式, 进行了多组长时间积分试验, 对比观测资料, 讨论了这些海域海表温度异常 (SSTA) 对西北太平洋副热带高压年代际变化的影响。结果表明: 全球、 热带、 热带印度洋-太平洋和热带印度洋海表温度变化均对夏季西北太平洋副热带高压的年代际变化有重要作用, 即在这些海域的海表温度变化影响下, 西北太平洋副热带高压均在1970年代中后期发生了年代际变化, 其后副高面积增大、 强度增强、 位置偏西、 偏南, 这与观测结果较一致; 热带太平洋海表温度变化对夏季西北太平洋副热带高压的年代际变化也有重要作用, 在其作用下, 夏季西北太平洋副热带高压的强度、 面积在1960年代后期发生年代际变化, 南界在1970年代中后期发生年代际变化, 这些时段以后副高强度增强、 面积增大、 偏南; 热带印度洋海表温度驱动模拟的西北太平洋副热带高压变化比热带太平洋海表温度驱动模拟的副高更接近于观测结果, 且年代际变化更显著, 其差异的可能原因在于两区海表温度在1970年代中后期以后的年代际变化能在孟加拉湾〖CD*2〗中国东南沿海区域强迫产生的异常环流不同, 前者强迫产生出反气旋性环流异常, 有利于副高的增强、 面积增大和西伸, 而后者强迫产生出气旋性环流异常, 不利于副高的西伸; 热带太平洋和热带印度洋海表温度在1970年代中后期的冷、 暖年代际背景变化对夏季西北太平洋副热带高压年代际变化有重要作用; 热带外海表温度变化对西北太平洋副热带高压年代际变化作用较小。

     

    Abstract: Impacts of regional sea surface temperature anomaly (SSTA) on the interdecadal variation of the Northwestern Pacific Subtropical High (NWPSH) are studied by numerical simulation with the NCAR CAM3 global atmospheric circulation model drived by 1950-2000 monthly SST in different sea areas (global, extratropical, tropical, tropical Indian Ocean-Pacific, tropical Indian Ocean, and tropical Pacific), in comparison with observational data. Results suggest that the change in the global, tropical, tropical Indian Ocean-Pacific, and tropical Indian Ocean SST has great effect on the interdecadal variation of the subtropical high. The SST in these sea areas varies, the interdecadal variation of the subtropical high occurs in the middle-late 1970s, followed by its area enlarging, its intensity enhancing, and its position more westward or southward than normal, which is in better concord with observations; the variation of the tropical Pacific SST also influences the interdecadal change of NWPSH in summer, and as a result, the high’s area and strength change in the late 1960s on an interdecadal basis and its southern border undergoes interdecadal variation in the middle-late 1970s, afterward, the high’s intensity enhances, its area enlarges and its location is south of mean, which is opposite to the weaker impact offered by the extratropical SST. The variation of NWPSH driven by the SST in the tropical Indian Ocean is more consistent with the observations and more significant on the interdecadal scale than that driven by the SST in the tropical Pacific Ocean, and a possible reason is due to the contrast of anomalous circulation over the Bay of Bengal-Southeast China between them, with the former exerting anomalous anticyclone in favor of the intensity enhancing and enlarging and westward extension of the area, and the latter exerting anomalous cyclone unfavorable to the westward extension of the area. As a background, the interdecadal variations of the tropical Pacific and Indian SSTs occurring in the late 1970s have important effects upon the equivalent scale change in the NWPSH.

     

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