%0 Journal Article
%T Diagnosis of a Severe Rainstorm Event Induced by Eastly Wave and Vortex in Off Southeast Coast of China<br>Diagnosis of a Severe Rainstorm Event Induced by EastlyWave and Vortex in Off Southeast Coast of China
%A ZHENG Feng
%A <br>ZHENG
%A Feng
%J 高原气象
%D 2009
%I 
%X Using the NCEP reanalysis at 1° ×1° resolution in conjunction with satellite imagery, a study is undertaken of easterly wave related rainstorm events on August 3～4, 2001 in seaboards between northern Fujian and southern Zhejiang, expounding the scheme for computing helicity, and exploring the rainstorm evolution and the genesis of the Yandang mountains-triggered a meso-vortex (Duan and Chen, 2005) by means of helicity and Q vector divergence. Besides, MM5V2 is employed to simulate the easterly wave caused meso-vortex. Results show that the development of the central intensity and location of the high-valued helicity is well indicative of the fallout area and the genesis of the meso-vortex, discovering that the space/time evolutions of helicity serve as indicators of some utility for the rainfall occurrence; it is revealed that the calculated helicity is of higher precision than MM5V2 simulations in predicting the initial position and the track of the meso-vortex, with their combination contributing to the improvement of predicting the meso-vortex, also, the space/time evolutions in the superimposition of the zone of large-value helicity gradients upon that of high-value Q vector divergence gradients can be used to accurately forecast the rainstorm happening and initial position of the meso-vortex, thereby illustrating the higher ability of diagnosing the precipitation and its system in the superimposed region.
%K Easterly wave
%K Meso-vortex
%K Helicity
%K Q vector
%K MM5 modeling<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=FCD959CAD9EF92C38C4323B51D54F3DB&aid=DDB515990F28C819908E036BF910235B&yid=DE12191FBD62783C&vid=D3E34374A0D77D7F&iid=94C357A881DFC066&sid=10343777FBBF55D5&eid=63025EFC6CC49145&journal_id=1000-0534&journal_name=高原气象&referenced_num=0&reference_num=31