Five-Year Climatology of Local Convections in the Dabie Mountains
Five-Year Climatology of Local Convections in the Dabie Mountains
复制标题
大别山局地对流五年气候特征
DOI：
10.3390/atmos11111246
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发表时间：
2020-11
期刊：
影响因子：
2.9
通讯作者：
Zuxiang Yang
中科院分区：
文献类型：
--
作者：
Linlin Zheng;Jianhua Sun;Xuexing Qiu;Zuxiang Yang
大别山局地对流（LCDM）在大别山区发生频繁，并给邻近地区带来灾害性天气。为了了解LCDM的特征，研究了LCDM的空间分布、月变化和日变化以及可能的机制。基于2014-2018年暖季（4 - 9月）5年期间的雷达复合反射率数据，共识别出195例LCDM。LCDM在大别山迎风坡出现频率最高，在背风坡出现次高。结果表明，LCDM的峰值出现在7月和8月，而其日变化在当地太阳时（LST）的下午12：00-16：00表现出一个主要的峰值。大多数LCDM不离开大别山（NoOut型），占总数的89.7%，平均寿命为3.5 h。相比之下，Out-Type的寿命（即，远离大别山的LCDM）的时间较长（平均为5.8 h），而大多数外型LCDM在南坡发展（“南型”），少数在北方坡也得到加强（“北型”）。南型主要产生短时强降水，北型主要产生雷暴大风。结果表明，LCDM是由热力引起的，“南型”和“北型”都是由南风扰动控制的。迎风坡上的上坡风和热源的抬升导致了“南型”的发展，而背风坡上波浪状扰动引起的上升导致了“北型”。这些机制应进一步研究在未来的工作中，通过使用现场实验和数值模拟。
Local Convection in Dabie Mountains (LCDM) occurs more frequently over the Dabie Mountains and brings severe weather to adjacent areas. In order to understand the characteristics of LCDM, their spatial distribution, the monthly and diurnal variations, and possible mechanisms are investigated. Based on radar composite reflectivity data over the 5-y period of 2014–2018 during warm seasons (April–September), a total of 195 cases of LCDM are identified. The LCDM exhibits maximum frequency on the windward slopes of the Dabie Mountains with a secondary maximum on lee slopes. It is demonstrated that LCDM peaks in July and August, while their diurnal variation exhibits a major peak in the afternoon during 12:00–16:00 local solar time (LST). Most LCDM does not leave the Dabie Mountains (NoOut-Type), accounting for 89.7% overall, and has an average 3.5 h lifespan. In contrast, the lifespans of Out-Types (i.e., LCDMs that move away from the Dabie Mountains) are longer (5.8 h on average), while most Out-Type LCDMs develop on southern slopes (‘South-Type’) and a few are also reinforced on northern slopes (‘North-Type’). The South-Type mainly produces short-duration heavy precipitation, while the ‘North-Type’ predominately generates thunderstorms high winds. It is suggested that LCDM is thermally induced, and that both the ‘South-Type’ and ‘North-Type’ are controlled by southerly wind perturbation. Lifting by upslope wind and heat sources over windward slopes has led to ‘South-Type’ development, while ascent induced by wave-like perturbations on lee slopes has led to ‘North-Type’. These mechanisms should be further investigated in future work by using field experiments and numerical simulations.
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长江流域二级地形东传中尺度对流系统特征及分类
影响因子：
3
作者：
Yang Ruyi;Zhang Yuanchun;Sun Jianhua;Fu Shenming;Li Jun
通讯作者：
Li Jun
DOI：
10.1109/csss.2012.25
发表时间：
2012-08
期刊：
2012 International Conference on Computer Science and Service System
影响因子：
--
作者：
Honghai Liu;Xianghua Hou
通讯作者：
Honghai Liu;Xianghua Hou
影响因子：
3.2
作者：
E. Kalnay;A. Dalcher
通讯作者：
E. Kalnay;A. Dalcher
DOI：
--
发表时间：
2005
期刊：
Plateau Meteorology
影响因子：
--
作者：
Sun Ji-song
通讯作者：
Sun Ji-song
DOI：
10.1175/1520-0450(1973)012
发表时间：
1973-06
期刊：
Journal of Applied Meteorology
影响因子：
--
作者：
A. Betts;F. J. Dugan
通讯作者：
A. Betts;F. J. Dugan