Characteristic Analysis on Two Regional Rainstorms at Guanzhong in Early Summer

ZHANG Yabin; MA Xiaohua; RAN Lingkun; HOU Jianzhong

doi:10.7522/j.issn.1000-0534.2015.00014

Plateau Meteorology >

2016 , Vol. 35 >Issue 3: 708 - 725

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00014

Characteristic Analysis on Two Regional Rainstorms at Guanzhong in Early Summer

ZHANG Yabin ,
MA Xiaohua ,
RAN Lingkun ,
HOU Jianzhong

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Xi'an Meteorological Observatory of Shaanxi Province, Xi'an 710016, China;2. Shaanxi Meteorological Observatory, Xi'an 710014, China;3. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

Received date: 2014-09-02

Online published: 2016-06-28

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Abstract

NCEP 1°×1° reanalysis data,conventional observation data and satelite data are used to analyse characteristics of circulation pattern,physical field and Temperature of Black Body(TBB)for two early summer rainstorms at Guanzhong from 2 to 3 June 2006(the‘0602')and on 25 May 2013(the‘0525’)with midsummer case comparison.Results show that:before early summer rainstorms happen,Tibetan High is weak and located obviously southward,which cause morphology and location changes of 200 hPa Jet north to rainstorm are small.At the same time,wind longitudinal gradient at the south side of 200 hPa Jet increases significantly.During early summer rainstorm there are no impacts of West Pacific Subtropical High and remote typhoon,meanwhile,westerlies influence systems at upstream and surrounding area are different,which lead to vapor transportation and convergence at low levels are significantly weaker than midsummer cases and different distributions.Stability of high pressure around China eastern continent on 850 hPa is contributed to duration of southeast vapor transportation to rainstorm area.Early summer rainstorms happened under potential stable stratification and warm and moist air climbe northward along the low level cold air.Isentropic surface tilted northward with height increasing along rainstorm centre and it exist energy front genesis and symmetric instability.Moist Potential Vorticity (MPV)anomaly appear over rainstorm area.Meanwhile,vertical difference between deeply positive MPV at mid-high levels and shallowly negative at low level increases.MPV above 300 hPa increase significantly.Zonal vertical circulations about 300 km east to early summer rainstorms contribute to upward movement maintaining.The maximum of vertical velocity,central height and unstable energy near high energy ridge at low level during early summer rainstorms are obviously lower than midsummer cases.Total helicity significantly increased zone is indicative to early summer rainstorm beginning.Zero line between positive and negative helicity area is near the north boundary of early summer heavy rain,meanwhile,positive helicity increasing center is near the north boundary of rainstorm.There is a significant negative helicity area north to Guanzhong.Positive helicity range and strength near Guanzhong are obvious small and its center moving and increase area are relatively south with midsummer case comparison.Meanwhile,locations of positive helicity centers in vertical direction are relatively dispersive.Early summer rainstorm clouds are large and have complex structure,which mainly composed of northern shield shaped cloud corresponding significant anticyclonic region at high level and southern belt cloud region at low level.TBB centers are higher than -60 ℃ and cloud top are lower than those of midsummer cases.Early summer rainstorm mainly located near the convergence area of north and south clouds and strong belt echo rather than TBB central or large gradient areas.

Key words： Early summer rainsto; Circulation pattern; Physical fields; TBB

Cite this article

ZHANG Yabin , MA Xiaohua , RAN Lingkun , HOU Jianzhong . Characteristic Analysis on Two Regional Rainstorms at Guanzhong in Early Summer[J]. Plateau Meteorology, 2016 , 35(3) : 708 -725 . DOI: 10.7522/j.issn.1000-0534.2015.00014

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