2012年黑龙江省春播期两次透雨过程对比分析

利用常规气象观测资料和NCEP1°×1°再分析资料,对黑龙江省2012年春播期4月21—23日、25—26日两次透雨过程的环流形势和物理量场特征进行了对比分析。结果表明:两次降雨过程都存在低涡,21—23日降雨在低涡中心附近,降水分布比较均匀,850hPa降温3~5℃。25—26日降雨在低涡延伸出的切变线附近,降水分布不均,850hPa降温9~15℃。两次过程水汽来源于黄海、日本海的西南气流提供的充足水汽输送。第2次水汽条件、动力条件、热力条件好于第1次,但在三江平原西部两次降雨量相差不大。

Comparative Analysis of Two Soaking Rain Processes in Heilongjiang in Spring of 2012

By using the conventional observation and NCEP reanalysis data,two soaking rain processes in Heilongjiang Province from 21to 23and 25to 26April 2012are compared.The contrast analysis of their meteorological characteristics is made from the aspects of the synoptic circulation pattern and physical mechanisms.The results show that two soaking rain processes was influenced by a low vortex.The rainfall area of the first soaking rain process was near the low vortex center;there was a uniform rainfall distribution and 3℃to 5℃temperature fall at 850hPa.The rainfall of the second soaking rain process was near the shear line from the low vortex;there was a uneven rainfall distribution and 9 ℃ to 15 ℃ temperature fall at 850hPa.The low-level south west airflow provided sufficient moisture from the Yellow Sea and the Sea of Japan.Water vapor,dynamic,and thermal conditions of the second soaking rain were more favorable than those of the first soaking rain,but there was little difference in rainfall between the two processes in the western Sanjiang Plain.