BADIATIVE FEATURES IN THE RAINSTORM

Long-wave cooling rate and short-wave warming rate during the heavy precipitation in Beijing are calculated by the parametric method.In the day time,the cloud-absorbed short-wave energy causes a maximum heating about 6℃·day-1 in the rain cloud cluster.The maximum warming rate occurs in the upper troposphere between 300 and 400 mb.The vertical distribution of radiative heating is very similar to that of convective heating.Long-wave cooling in cloud and subcloud layer over the rain area is less than that in the surrounding clear area.That causes a relative warming in the lower troposphere over the rain area.There is a relative large cooling on the top of the cloud due to long wave radiation.This factor acts more strongly in the evening,6 hours before the so called "night rainstorm".