| 赣北梅雨期降水异常分析 |
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| 引用本文： | 舒长根,罗先诚.赣北梅雨期降水异常分析[J].热带地理,2002,22(4):367-370. |
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| 作者姓名： | 舒长根 罗先诚 |
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| 作者单位： | 江西师范大学城市与环境科学学院,江西,南昌,330027 |
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| 摘 要： | 利用天气图和500hPa高度距平资料,对赣北梅雨期多雨年和少雨年中西太平洋副高活动异常进行了对比分析,揭示出赣北梅雨期的长短及降水量的大小,与副高第二次北跳早晚关系密切。在此基础上,进一步研究了副高第二次北跳为什么有早有晚这一关键性问题。结果显示,副高第二次北跳早晚在一定程度上受青藏高原夏季热力状况影响。当青藏高原5月温度偏高时,高原上空的高压偏强,且东移偏早,从而引起副高第二次西伸北跳偏早,赣梅雨期降水偏水。反之,降水偏多。该结合与某些“青藏高原对我国东部天气影响”的研究结果相一致,从而为预测鄱阳湖平原旱涝提供了一条新思路。
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| 关 键 词： | 梅雨期 降水 青藏高原 江西 天气图 |
| 文章编号： | 1001-5221(2002)04-0367-04 |
| 修稿时间： | 2001年11月24 |
AN ANALYSIS ON THE PRECIPITATION ANOMALY DURING "MEIYU"PERIODS IN NORTHERN JIANGXI |
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| SHU Chang-gen,LUO Xian-cheng.AN ANALYSIS ON THE PRECIPITATION ANOMALY DURING "MEIYU"PERIODS IN NORTHERN JIANGXI[J].Tropical Geography,2002,22(4):367-370. |
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| Authors: | SHU Chang-gen LUO Xian-cheng |
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| Abstract: | By using synoptic chart and 500 hPa average geopotential height departure date, the west Pacific Ocean subtropical high anomaly actions in rainy years and droughty years during "Meiyu" periods in northern Jiangxi are analysed. It is demonstrated that the length of the "Meiyu" period and the precipitation amount during the period are associated with the time of the second northward jump of the subtropical high. The key problem is that why the second jump of the subtropical high may arise early or late. Results of the study show that the time of the second jump northward of the subtropical high is in a certain affected by the summer thermal condition of the Qinghai-Xizang Plateau. If the temperature in May on the Plateau is higher, high pressure over the Plateau will be stronger and will move eastward earlier. As a result the subtropical high will jump northwards and extend westwards earlier, and the precipitation during "Meiyu" period in northern Jiangxi will be less . Conversely, the precipitation will be more. This conclusion accords with some conclusions in the study of the effects of the "Qinghai-Xizang Plateau on weather of eastern China". Thus some new ideas for forecasting "flood and drought" in Boyang Lake plain are given. |
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| Keywords: | Northern Jiangxi "Meiyu" periods Subtropical high Qinghai-Xizang Plateau |
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