A comparison study of summer-time synoptic-scale waves in South China and the Yangtze River basin using the TRMM Multi-Satellite Precipitation Analysis daily product
A comparison study of summer-time synoptic-scale waves in South China and the Yangtze River basin using the TRMM Multi-Satellite Precipitation Analysis daily product
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DOI：
10.1007/s11430-007-0125-6
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发表时间：
2008-01
影响因子：
5.7
通讯作者：
Fu Rong;Hu Liang;Gu Guojun;Li Yaodong
中科院分区：
文献类型：
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作者：
Fu Rong;Hu Liang;Gu Guojun;Li Yaodong
利用1998-2004年TRMM多卫星降水分析（TMPA）逐日产品，对华南和长江流域夏季天气尺度波动进行了定量分析和比较。采用了一种新颖的三维谱分析方法。结果表明，华南地区天气尺度波主要向西传播，其纬向波数范围为9-21，频率范围为-0.12 ~-0.22周/天;长江流域天气尺度波主要向东传播，其纬向波数范围为9-21，频率范围为0.2-0.29周/天。进一步探讨和比较了这些波的纬向和纬向分布以及季节变化。结果表明，华南夏季天气尺度波动主要是西太平洋热带辐合带（ITCZ）北移和振荡的结果，而长江流域夏季天气尺度波动则主要与青藏高原西风气流中的天气槽有关。
Summer-time synoptic-scale waves in South China and the Yangtze River basin are quantified and compared by means of analyzing the 6-year (1998–2004) TRMM Multi-Satellite Precipitation Analysis (TMPA) daily product. An innovative 3-dimensional spectrum analysis method is applied. The results indicate that synoptic-scale waves appearing in South China prominently propagate westward within a zonal wavenumber range of 9–21 and a frequency range of −0.12–−0.22 cycles day−1, while those in the Yangtze River basin primarily move eastward with the same characteristic wavenumbers of 9–21, but within a frequency range of 0.2–0.29 cycles day−1. Zonal and meridional distributions, and seasonal variations of these waves are further explored and compared. It shows that summer-time synoptic-scale waves in the South China result from the northward migration and oscillation of the Intertropical Convergence Zone (ITCZ) in the western Pacific, whereas the ones in the Yangtze River basin are generally related to the synoptic troughs within the westerly flow, originating from the Qinghai-Tibet Plateau.