Analysis of Latent Heat and Its Feedback Mechanism during a Meiyu-Front Rainstorm
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Abstract:
Based on the reasonable numerical simulation for a Meiyu-front heavy rainfall during 24-25 June 2003 in the area south of the Changjiang River and the model products,an analysis is made of the temporal-spatial distribution characteristics of large-scale stable latent heat release(LHR) and convective latent heat release,as well as the feedback mechanisms of latent heat in the process of the rainfall event.The results show that the averaged convective LHR was greater than the large-scale stable LHR throughout the event,and both(distributed) between 900 and 250 hPa with the center at 400 hPa;both the large-scale stable LHR and convective LHR increased and extended deep with strengthening rainfall.The "dry" experiment shows that LHR heated further the atmosphere and strengthened the upper-level high pressure and divergence,resulting in the enhancing of the upper-level northwest jet to the north;meanwhile,the effect of LHR weakened the lower-level low pressure,induced convergence,and strengthened the lower-level southwest jet to the south and the lower-level shear line.
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Clc Number:
P458.121.1
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.