Journal of Lake Sciences | 2019
Quantifying the effects of different cold air events on latent and sensible heat fluxes of Lake Taihu
Abstract
As the major synoptic system,cold air events influence the water vapor and heat exchanges between lake and atmosphere by changing the meteorological conditions of air masses over the lake. Then biophysical and biogeochemical cycles in the lake ecosystem would be moderated by cold air passage. Based on dataset of the Taihu Eddy Flux Network observed during the five cool seasons ( 2012-2017) ,the effects of different cold air events ( cold wave,severe cold air events and strong cold air events) on latent and sensible heat fluxes were quantified on the large subtropical shallow Lake Taihu. The results showed that cold wave,severe cold air events and strong cold air events totally happened 4,11 and 33 times,and lasted for 14,31 and 78 days,respectively. The sensible and latent heat exchanges between lake and atmosphere were accelerated significantly by the passage of cold air. The sensible heat flux increased by 10.3,6.0 and 4.3 times during cold wave,severe cold air events and strong cold air events,respectively. The latent heat flux was increased by 4.0,2.1 and 2.7 times,respectively. Although cold air passage only occupied 16.4%