淮北地區(qū)一次弱天氣尺度強迫背景下MCS過程分析與模擬

doi:10.12306/2021jms.0008

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淮北地區(qū)一次弱天氣尺度強迫背景下MCS過程分析與模擬
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                        10.12306/2021jms.0008
                    
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中圖分類號:P458
基金項目:江蘇省氣象局預(yù)報員專項（JSYBY201815）

Analysis and simulation of an MCS process in Huaibei area against weak weather scale forcing

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利用多源觀測資料和WRF中尺度數(shù)值模式對2016年8月7日淮北地區(qū)一次中尺度對流系統(tǒng)（Mesoscale Convective Systerm，MCS）過程進行診斷分析和模擬。結(jié)果表明，本次MCS過程發(fā)生在弱天氣尺度強迫背景場下，系統(tǒng)性上升運動較弱，對流層低層存在較弱的源自西北太平洋的偏東風轉(zhuǎn)東南風的水汽輸送作用；MCS移動和形態(tài)變化與地面輻合線演變特征較為一致，地面流場的演變與降水強度之間有著密切的聯(lián)系；WRF模式較好地模擬出本次降水的分布特征以及MCS演變過程中對流活動和地面輻合線相互作用的特征。模擬結(jié)果表明，本次過程中MCS在逐漸南移過程中完成了對流單體的更替，地面輻合線在此過程中發(fā)揮重要作用，并且處于不同發(fā)展階段的對流單體環(huán)境場的對流不穩(wěn)定度的垂直分布存在明顯差異。

Abstract:

Based on the multiple observations and WRF model, a Mesoscale Convective System (MCS) process occurred on 7 August 2016 in Huaibei area was simulated and diagnostically analyzed. Results show that:firstly, the MCS process happens under weak weather scale forcing with weak systemic upwelling, coupling with weak water vapor transportation by the east to southeast winds, which originated from the Northwest Pacific Ocean in the lower troposphere. Secondly, the movement and deformation of MCS are consistent with the evolution characteristics of surface convergence line, and the evolution of surface flow field is closely related to the rainfall intensity.Thirdly,the distribution characteristics of precipitation and the interaction between convective activities and the ground convergence line during the evolution of MCS are reasonably simulated by WRF model. Finally, the simulation results indicate that the MCS has completed the replacement of convective cells during the gradual southward movement, meanwhile the surface convergence line plays an important role in this process. Besides, differences can be seen in the vertical distribution of convective instability in the environmental field of convective monomers at different stages of development.

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安禮政,劉安寧,宋昊冬,夏網(wǎng)萍,王蓓元.淮北地區(qū)一次弱天氣尺度強迫背景下MCS過程分析與模擬.氣象科學,2021,41(5):657-667 AN Lizheng, LIU Anning, SONG Haodong, XIA Wangping, WANG Beiyuan. Analysis and simulation of an MCS process in Huaibei area against weak weather scale forcing. Journal of the Meteorological Sciences,2021,41(5):657-667

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收稿日期:2020-07-07
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