| 达尔文气压变化与蒙古东北部降水的关系研究 |
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| 引用本文： | 王会军.达尔文气压变化与蒙古东北部降水的关系研究[J].大气科学,2006,30(5):753-758. |
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| 作者姓名： | 王会军 |
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| 作者单位： | 中国科学院大气物理研究所,北京,100029 |
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| 基金项目： | 国家自然科学基金;中国科学院知识创新工程项目;中国科学院科研基金 |
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| 摘 要： | 达尔文港是气象工作者非常熟悉的地名,因为南方涛动就是由达尔文和塔希提岛两个站的气压之差来定义的,达尔文港的气压(DP)可以代表澳大利亚北部海洋性大陆地区的气压.因此,作者的研究目的就是揭示该区域气压系统的变化与蒙古东北部降水的关系.结果表明,DP的正位相和区域低层大气辐散、高层大气辐合环流相关连,在亚洲对流层上层是异常西南风,对流层下层是异常偏北风,东亚季风减弱,在蒙古东北部地区的异常风为西北向,即,由内陆地区吹向西北太平洋地区,这意味着水汽由海洋向蒙古地区的输送减弱了,从而造成了降水的减少.反之亦然.
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| 关 键 词： | 根据树轮恢复的降水 达尔文站气压 大气环流 |
| 文章编号： | 1006-9895（2006）05-0753-06 |
| 收稿时间： | 2006-04-14 |
| 修稿时间： | 2006-04-142006-06-15 |
Signals of Darwin Atmospheric Pressure in the Tree-Ring Recorded Northeastern Mongolia Precipitation |
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| WANG Hui-Jun.Signals of Darwin Atmospheric Pressure in the Tree-Ring Recorded Northeastern Mongolia Precipitation[J].Chinese Journal of Atmospheric Sciences,2006,30(5):753-758. |
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| Authors: | WANG Hui-Jun |
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| Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Port Darwin is a well-known place name for meteorologists,because the Southern Oscillation is usually defined as the atmospheric pressure difference between Tahiti and Port Darwin,indicating the phenomenon of so-called Walker circulation.The atmospheric pressure in Port Darwin may well represent the air mass system in northern Australia and the maritime continent.Thus the current study aims at examining the signals of the pressure in northern Australia and the maritime continent,which is represented by the Darwin pressure,in the long-term tree-ring reconstructed northeastern Mongolia precipitation.The results show that positive phase of Darwin pressure(DP) is associated with low-level divergence and high-level convergence circulations in the region,and the anomalous southwesterly flow in the high troposphere and anomalous north winds in Asia,indicating the weakening of the East Asian monsoon circulation.In northeastern Mongolia,the low-level wind anomalies are northwestward from the inland region to the northwestern Pacific,denoting the decrease of the water vapor transport from the ocean to the inland region,thus reducing the precipitation in northeastern Mongolia,and vice versa. |
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| Keywords: | tree-ring reconstructed precipitation Darwin atmospheric pressure atmospheric general circulation |
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