1980年黄河中下游干旱期的热源和热汇的诊断分析

DIAGNOSTIC ANALYSIS ON THE DISTRIBUTION OF APPARENT HEAT SOURCES AND SINKS IN THE MID-LOWER REACHES OF THE YELLOW RIVER IN THE DROUGHT PERIOD OF 1980

计算了1980年6—9月逐日(12GMT)黄河中下游干旱期的视热源(Q_1)和视水汽汇(Q_2)的分布。结果表明,在典型干旱期(7—8月)内,对流层大气中基本上为热汇,且以对流层高层最强。在典型干旱期的前、后时段(6月、9月),对流层低层大气中为弱的热源。必须指出,Q_1、Q_2各项中最大的是垂直平流项,其次是水平平流项。

The daily distributions of apparent heat sources(Q_1)and apparent moisture sinks(Q_2)fromJune through September of 1980 in mid-lower reaches of the Yellow River are estimated.It isfound that the heat sink appeared in the troposphere during typical drought period(July—August),and the maximum occupied in the upper troposphere with heating rate of —3.2℃/d.During June and September there were weak heat sources in the lower troposphere.In addition,the largest contribution was the vertical advection term,the second one was the horizontal advec-tion term among each three terms of Q_1 and Q_2,respectively.