摘要
对于大气中水汽的定性、定量测量是提高内蒙古干旱研究与预测的有效手段。利用NCEP再分析资料和内蒙古地区实测降水资料(1961—2000年),定性、定量地分析东亚水汽分布、水汽输送与内蒙古夏季干旱的关系。得出内蒙古地区上空低层大气的含水量偏少是内蒙古夏季干旱的一个重要因素。由于青藏高原大地形作用,孟加拉湾和南海的水汽北上受阻,不能达到内蒙古高原是形成内蒙古干旱的又一原因。受大气环流影响,内蒙古高原水汽辐合偏弱是内蒙古夏季干旱的重要原因。青藏高原的水汽通量与内蒙古东西部降水都存在明显负相关;孟加拉湾至内蒙古西部是内蒙古西部地区降水的水汽通道,南海至中国东北地区为内蒙古东部降水的水汽通道。
Qualitative and quantitative measurement for atmospheric moisture is an effective means of improving the Inner Mongolia drought study or forecast. Adopting NCEP and observation precipitation data from 1961 -2000, the relationship between the moisture distribution or transportation in East Asia and summer drought in Inner Mongolia is analyzed. The results show that Less moisture content at low level is an important factor of Inner Mongolia drought. On the other hand, because of Qingzang plateau terrain, it is difficult that the moisture from the Bay of Bengal and South China Sea move northward, and it could not arrive in Inner Mongolia, which is another key factor. In addition, Affected by air circulation, the less water vapor convergence is also an important factor of Inner Mongolia drought. The moisture flux at Qingzang plateau has prominently negative correlation with the precipitation of whole Inner Mongolia area. Moisture passage for the precipitation of West Inner Mongolia is from the Bay of Bengal to West Inner Mongolia. The passage for the precipitation of east Inner Mongolia is from South China Sea to northeast China.
出处
《气象》
CSCD
北大核心
2007年第6期75-81,共7页
Meteorological Monthly
关键词
干旱
水汽
降水
水汽通量
相关
drought moisture precipitation moisture flux correlation
