| 莱州湾西北与山东半岛北部强海效应降雪个例分析 |
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| 引用本文： | 郑丽娜,王坚红,杨成芳,吴珂.莱州湾西北与山东半岛北部强海效应降雪个例分析[J].气象,2014,40(5):605-611. |
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| 作者姓名： | 郑丽娜 王坚红 杨成芳 吴珂 |
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| 作者单位： | 南京信息工程大学大气科学学院, 南京 210044; 山东省东营市气象局，东营 257091;南京信息工程大学大气科学学院, 南京 210044;山东省气象局，济南 250031;山东省气象局，济南 250031 |
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| 基金项目： | 国家自然科学基金项目（41175044） 资助 |
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| 摘 要： | 利用常规资料、NCEP再分析资料和加密自动站资料对2011年12月8日莱州湾西岸一次强海效应降雪过程进行了诊断分析。结果表明:此地的海效应降雪与山东半岛北部的海效应降雪都是在适宜的背景场、有利的海气温差及较强的低空冷平流等基本条件下发生的。但是具体到风场配置、海气温差强度、水汽分布及动力、热力条件等方面存在着差异。在这次过程中,900 hPa以上为西北风,以下维持持续的东北风,是造成此次强海效应降雪的主要原因。这种风场结构与半岛北部的高、低空均要求西北风不同。结合物理量场的诊断分析认为,莱州湾西岸的海效应降雪与山东半岛北部的同属于浅对流降雪。本次过程中900 hPa以下存在上升运动、水汽辐合中心、不稳定层结和大的海气温差,近地层的切变线触发了不稳定能量的释放。强降雪区出现在1000 hPa相当位温暖舌的区域,暖舌的位置与山东半岛北部发生强海效应降雪时的不同,前者在莱州湾,后者在半岛北部沿海。从云图上看,冷流低云在海面上表现为一条条顺气流方向的云线,云的个体呈细胞状,接近陆地时,由于海陆下垫面的差异使得云层加厚,云的走向发生偏转,降雪加大。
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| 关 键 词： | 莱州湾 海效应降雪 不稳定层结 云线 |
| 收稿时间： | 1/7/2013 12:00:00 AM |
| 修稿时间： | 2013/4/25 0:00:00 |
Case Analysis of Marine Effect Snowstorm in Northwestern Laizhou Bay and Northern Shandong Peninsula |
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| ZHENG Lin,WANG Jianhong,YANG Chengfang and Wu Ke.Case Analysis of Marine Effect Snowstorm in Northwestern Laizhou Bay and Northern Shandong Peninsula[J].Meteorological Monthly,2014,40(5):605-611. |
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| Authors: | ZHENG Lin WANG Jianhong YANG Chengfang and Wu Ke |
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| Institution: | Department of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044; Dongying Meteorological Office of Shandong Province, Dongying 257091;Department of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044;Shandong Provincial Meteorological Bureau, Jinan 250031;Shandong Provincial Meteorological Bureau, Jinan 250031 |
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| Abstract: | Based on the conventional observational data, NCEP reanalysis data and automatic weather station data, the marine effect snowstorm which happened in the west of Laizhou Bay on 8 December 2011 was analyzed diagnostically. The findings show that snowfall occurs in appropriate ambient field, favorable air sea temperature difference and more intensive cold advection. However, differences exist in wind field configuration, air sea temperature difference range, water vapor distribution dynamic conditions and thermal conditions. During this snowfall process, northwest winds blow above 900 hPa whice under the level, it maintains sustained northeasterly which is the main reason for this marine effect snowstorm process. This wind field is different from the northern peninsula where northwest winds blow in both upper and low airs. By analyzing the physical field, the marine effect snowfall belongs to shallow convective snowfall. There is upward motion, moisture convergence center, unstable stratification and large air sea temperature difference under 900 hPa in the west of Laizhou Bay, and the shear line of near surface triggers the release of unstable energy in the process. The heavy snowfall area is the warm tongue of equivalent potential temperature at 1000 hPa. The position of warm tongue here is different from that in the north of Shandong Peninsula. The former is in Laizhou Bay, while the latter is in the northern coast of the peninsula. From the cloud images, the cold airflow clouds on the sea show a streamwise cloud line, and the cloud is individual cells. When nearing the land, the clouds get thickened, cloud line deflects and the intensity of snowfall increases. |
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| Keywords: | Laizhou Bay sea effect snowstorm unstable stratification cloud line |
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