摘要
利用常规气象观测资料、NCEP/NCAR北半球逐日再分析等资料,对宁夏2013年5月14日到16日和2011年5月7日夜间到9日夜间2次久旱转透雨过程从高空环流背景、中低空影响系统、温度及物理量场特征等进行了对比分析.结果表明,2次过程的500 hPa平均高度距平场上,亚洲中纬度地区均处于"东高西低"环流型下,水汽主要来源于孟加拉湾及南海地区;主要影响系统、西太平洋副热带高压位置、"东高西低"环流型东高所处位置的不同,造成出现透雨范围的不同;水汽通量、水汽通量散度、垂直速度、散度、涡度、经向风和能量、温度分布的不同导致2次透雨过程降水特征的不同.在此基础上,给出了宁夏春季久旱转透雨预报的着眼点.
Based on conventional meteorological observation data and NCEP/NCAR daily reanalysis data of Northern Hemisphere, the comparative analysis was made about two synoptic processes on hands of altitude circulation background, low-altitude affection to system, characteristics of temperature and physical field, which were in drought to soaker processes on May 14 to 16, 2013 and on May 7 to 9 night, 2011 in Ningxia. The results show that, at 500 hPa height anomalies field, middle latitude region of Asia, pressure was under background of ＂east-high and west-low＂, the vapor is mainly from the South China Sea and the Bengal Bay. The main impact of the system, the western Pacific subtropical high position and difference position of ＂east high and west low pressure＂ circulation, are the reason for difference range of soaking rain. The difference of precipitation characteristics about soaking rain are caused by the different distribution of the vapor flux, moisture flux divergence, vertical velocity, divergence, vorticity, meridional wind, energy and the temperature. Finally, the forecast point was given out for drought turning to soaking rain during spring in Ningxia.
出处
《宁夏工程技术》
CAS
2014年第1期1-7,共7页
Ningxia Engineering Technology
关键词
宁夏
春季第一场透雨
环流背景
物理量特征
对比分析
预报着眼点
Ningxia
the first soaking rain during spring
circulation background
characteristics of physical quantities
comparative analysis
forecast point
