Water Cycle and Microphysical Processes Associated with a Mesoscale Convective Vortex System in the Dabie Mountain Area |
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Authors: | WANG Xiaokang NI Yunqi XU Wenhui GU Chunli and QIU Xuexing |
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Institution: | School of Atmospheric Sciences, Nanjing University, Nanjing 210093, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430074,State Key Lab of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081,School of Atmospheric Sciences, Nanjing University, Nanjing 210093,Beijing Institute of Applied Meteorology, Beijing 100029,Anhui Meteorological Observatory, Hefei 230031 |
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Abstract: | The water vapor budget and the cloud microphysical processes associated with
a heavy rainfall system in the Dabie Mountain area in June 2008 were
analyzed using mesoscale reanalysis data (grid resolution 0.03o× 0.03o, 22 vertical layers, 1-h intervals), generated by amalgamating
the local analysis and prediction system (LAPS). The contribution of each
term in the water vapor budget formula to precipitation was evaluated. The
characteristics of water vapor budget and water substances in various phase
states were evaluated and their differences in heavy and weak rainfall areas
were compared. The precipitation calculated from the total water vapor
budget accounted for 77% of actual precipitation; surface evaporation is
another important source of water vapor. Water vapor within the domain of
interest mainly came from the lower level along the southern boundary and
the lower--middle level along the western
boundary. This altitude difference for water vapor flux was caused by
different weather systems. The decrease of local water vapor in the
middle--lower layer in the troposphere during the system development stage
also contributed to precipitation. The strength and the layer thickness of
water vapor convergence and the content of various water substances in the
heavy rainfall areas were obviously larger than in the weak rainfall areas.
The peak values of lower-level water vapor convergence, local water vapor
income, and the concentration of cloud ice all preceded the heaviest surface
rainfall by a few hours. |
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Keywords: | water vapor budget water substance SCHeREX data heavy rainfall |
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