| 青藏高原东北侧汛期降水若干问题研究 |
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| 引用本文： | 王宝灵,谢金南,吴国雄,俞亚勋.青藏高原东北侧汛期降水若干问题研究[J].大气科学,2000,24(6):775-784. |
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| 作者姓名： | 王宝灵 谢金南 吴国雄 俞亚勋 |
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| 作者单位： | 1.兰州干旱气象研究所,兰州 730020 |
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| 基金项目： | 国家“九五”重中之重项目96-908-05-03和甘肃省气象局科研项目98-04共同资助 |
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| 摘 要： | 利用青藏高原东北侧区域平均降水量资料（1958～1997年）和同期NCEP/NCAR再分析500hPa网格资料（2.5°×2.5°?），分析发现:（1）高原东北侧汛期降水份额最大的7、8、9月3个月近40年降水明显减少，过去明显存在的准3年周期振荡80年代以来处于低潮；（2）日本-北太平洋附近位势高度降低，鄂霍茨克海阻高加强是高原东北侧7、8、9月干旱最典型的标志；（3）就干旱流型而言，7月干旱环流与江淮梅雨环流特征十分相似，表现在江淮多梅雨年，一般是高原东北侧重旱年；（4）高原东北侧7～9月的典型旱年流型，实际就是ElNi?o流型；（5）ElNi?o事件对高原东北侧降水有明显影响，表现在该区域典型少雨年，一般发生于ElNi?o事件当年。从阶段看，以7～9月降水总量与ElNi?o事件相关最为显著，从月际看，尤以9月关系最好。
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| 关 键 词： | 青藏高原 降水 流型 ElNi?o |
A Study of the Precipitation of the Tibetan Plateau Northeastern Side during Flood Seasons |
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| Wang Baoling,Xie Jinnan,Wu Guoxiong and Yu Yaxun.A Study of the Precipitation of the Tibetan Plateau Northeastern Side during Flood Seasons[J].Chinese Journal of Atmospheric Sciences,2000,24(6):775-784. |
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| Authors: | Wang Baoling Xie Jinnan Wu Guoxiong and Yu Yaxun |
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| Abstract: | The NCEP/NCAR reanalysis monthly 500 hPa grid data (2.5o×2.5oLat/Lon) and the monthly precipitation of the Tibetan Plateau Northeastern side from 1958 to 1997 are used and analyzed. The results show that: (1) The precipitation for the recent fourty years is obviously decreased in July, August and September when the precipitation is most concentrated. And the quasi-three year period oscillation, which distinctly existed in the past years, has been in low phase since the 1980s in the Tibetan Plateau Northeastern side. (2) It is the most typical drought indicator in July, August and September of the Tibetan Plateau Northeastern side that the reduction of geopotential height near Japan to the northern Pacific and the intensification of Okhotsk blocking high. (3) For the drought flow patterns, the circulation of the drought years is very similar to that of the Changjiang-Huaihe Meiyu in July. In general, the heavy drought years occur in the Tibetan Plateau northeastern side when the rainy years occur in the Changjiang-Huaihe river basin. (4) The typical flow patterns during July to September for drought years in the Tibetan Plateau northeastern side are actually the El Ninoo patterns. (5) The El Nino events have evident influence on the precipitation in the Tibetan Plateau northeastern side, i.e., the typical drought years usually appear in the El Nino events years. In view of the time stage, the total precipitation during July to September is most closely correlated to the El Nino events, and the relationship is most notable in September. |
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| Keywords: | Tibetan Plateau precipitation flow pattern EI Nino |
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