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首页> 外文会议>2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring >The Analysis of Atmospheric Circulation and Water Vapor Conditions of Precipitation over the Heihe River Basin
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The Analysis of Atmospheric Circulation and Water Vapor Conditions of Precipitation over the Heihe River Basin

机译：黑河流域大气环流和降水水汽条件分析。

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It is of great significance to understanding deeply mechanism of precipitation and estimating accurately amount of precipitation. The purpose of this work is to explore the atmosphere effects on the precipitation over the Hei he river basin. Based on NCEP/NCAR re-analysis dataset with the resolution of 1¡ã¡Á1¡ã and 2.5¡ã¡Á2.5¡ã over the period 2000~2006and monthly precipitation from 15 stations for the same period, we investigated the vertical circulation and vapor conditions for the local-scale and further explore large-scale atmospheric circulation patterns for the rainy years and less rainy years. The comparative analysis results show that for both kinds of years, the water vapor all are net inflow averaged from June to September. However, there are notable differences in western and south boundary. In the western boundary, the inflow of vapor for the rainy years is more than that for the less rainy years. In the south boundary, there is a net inflow of vapor in the rainy years. Whereas there is a net outflow in the less rainy years. Besides, one more important point is that local ascending motion which is predominantly meridional over the Heihe river basin. Its range, position, and intensity have remarkable differences in the rainy years and less rainy years. The maximum vertical velocity is 1.2 cm/s for the former, and that for the latter is only 0.8 cm/s with the difference of 0.4cm/s. This phenomenon is discovered for the first time in this region. Furthermore, more/less precipitation corresponds well with the higher/lower Qinghai-Tibet plateau temperature, stronger/weaker 100hPa high-pressure of the Qinghai-Tibet plateau, and stronger/weaker westerly jet. The interaction of these systems aforementioned can make more precipitation mainly due to more water vapor inflow and stronger converging-ascending motion for the rainy years. The opposite is the case for the less rainy year--s.
机译：深刻理解降水机理，准确估算降水量，具有重要意义。这项工作的目的是探索大气对黑河流域降水的影响。基于2000〜2006年NCEP / NCAR再分析数据集，分辨率为1××1×2.5和×2.5×2.5×2.5，同期有15个站点的月降水量，局部的大气环流和蒸汽条件，并进一步探索雨季和少雨年的大规模大气环流模式。对比分析结果表明，这两种年份的水汽都是6月至9月的平均净流入量。但是，西部和南部边界存在显着差异。在西部边界，雨季的蒸气流入量比雨季较少的蒸气流入多。在南边界，在雨季中蒸汽净流入。而在少雨年份则有净流出。此外，更重要的一点是局部上升运动主要在黑河流域的子午线上。在雨季和雨季较少时，其范围，位置和强度都有显着差异。前者的最大垂直速度为1.2 cm / s，后者的最大垂直速度仅为0.8 cm / s，相差0.4cm / s。这种现象是在该地区首次发现的。此外，更多/更少的降水与青藏高原的较高/较低温度，青藏高原的高压100hPa较强/较弱以及西风急/弱相符。上述这些系统的相互作用可以产生更多的降水，这主要是由于在雨季水汽的流入增加以及更强的收敛上升运动所致。相反，少雨的年份- -- s。

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