Observational Analysis of Cloud Characteristics of the Bohai Sea-effect Snowstorms
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摘要: 利用静止卫星 (GMS-5, GOES-9, MTSAT) 红外数据与CloudSat卫星云剖面雷达数据、NCEP FNL分析资料与常规观测资料,对2001—2010年发生的12次渤海海效应暴雪过程中云的演变特征、渤海热力作用与暴雪云团垂直结构及相态组成进行了观测分析。发现不同生成源地的暴雪云通常在渤海上快速发展,云中多存在水平范围可达100~300 km的密实条状或块状云团,其下对应主要降雪区域;暴雪云生成源地可分为渤海湾及莱州湾附近、渤海中部、辽东湾附近3种,暴雪云在海上移动主要受850 hPa风场影响;渤海暖海面与其上冷空气间的热量、水汽交换形成的不稳定层结条件,导致暴雪云进一步发展;暴雪云发展旺盛时期高度可达4 km,其冰水含量最大值达600 mg·m-3且主要集中在2 km高度附近,平均值可达303 mg·m-3,冰粒子有效半径最大值约为120 μm,平均值约为91 μm。Abstract: Sea-effect snowstorm is a kind of typical local disastrous weather phenomena in winter of Shandong Province. The pioneering researches on snowstorm clouds usually focus on the period of snowfalls, but studies on their formation and development stages are rare. The clouds over the northern Shandong Peninsula usually are the southern edge of the sea-effect snowstorm clouds, and its evolution is closely relative to the main clouds over the Bohai Sea. 12 sea-effect snowstorm events during 2001—2010 over the Bohai Sea are investigated.First, stationary satellites (GMS-5, GOES-9, MTSAT) infrared data is used to investigate the evolution characteristics of snowstorm clouds, and combined with NECP FNL data, forming locations and moving features of different processes are classified. In addition, routine observation is used to analyze the corresponding relationship between snow and snowstorm clouds and the influence of the diabatic heating effect over the Bohai Sea. Finally, cloud profiling radar data of CloudSat are used to analyze the vertical structure and compositions of snowstorm clouds.The snowstorm clouds with different origins usually grow rapidly over the Bohai Sea, and among the clouds there are dense clouds with horizontal scale of 100—300 km in form of strips or a bulk, which is closely relative to the snowfall areas.The snowstorm clouds during their initial stages can be classified into three main categories according to their forming locations, near the Bohai Bay and the Laizhou Bay, the central part of the Bohai Sea, and near the Liaodong Bay. The movements of snowstorm clouds depend on winds at 850 hPa, and its dominant directions of movements can be classified into three types, by reference to the Bohai Strait move from west to east, from northwest to southeast, and from north to south, and finally the clouds reach the upper air of the northern Shandong Peninsula, which leads to its snowfalls.As cold winds move across long expanses of warmer water, the heat and moisture transport from the Bohai Sea warm surface upwards to its above cold air, defined as the Bohai sea-effect, results in the unstable conditions over the Bohai Sea. And meanwhile, the unstable conditions improve the shallow convection to intense, which results in the snowstorm clouds.The height of mature sea-effect snowstorm clouds can reach 4 km or so, and its ice-water mixture content has an average value of about 303 mg·m-3, its maximum is about 600 mg·m-3 and mainly distributes at 2 km height, and additionally the maximum and average values of ice effective radius is about 120 μm and 91 μm, respectively.
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图 2 2005年12月3—5日海效应暴雪过程中云团的演变
(填色代表云顶亮温;AB为下文垂直剖面所在位置) (a)3日21:00, (b)4日02:00, (c)4日04:00, (d)4日10:00, (e)4日14:00, (f)5日10:00
Fig. 2 Evolution of clouds of the sea-effect snow storm during 3—5 Dec 2005
(color shaded represents cloud top brightness temperature; AB indicates the location of later vertical section)(a)2100 BT 3 Dec, (b)0200 BT 4 Dec, (c)0400 BT 4 Dec, (d)1000 BT 4 Dec, (e)1400 BT 4 Dec, (f)1000 BT 5 Dec
图 3 同图 2,但为2008年12月3—5日海效应暴雪过程
(CD,EF,GH为下文垂直剖面所在位置) (a)3日12:00, (b)4日08:00, (c)4日10:00, (d)4日20:00, (e)5日02:00, (f)5日13:00
Fig. 3 The same as in Fig. 2, but for the storm case during 3—5 Dec 2008
(CD, EF, GH indicate the locations of later vertical section)(a)1200 BT 3 Dec, (b)0800 BT 4 Dec, (c)1000 BT 4 Dec, (d)2000 BT 4 Dec, (e)0200 BT 5 Dec, (f)1300 BT 5 Dec
图 6 沿图 2a中AB 2005年12月3—5日500~1000 hPa假相当位温梯度 (填充色,Δθse/Δp,其中Δp代表NCEP FNL数据中气压垂直分层间隔)、垂直风速 (黑线, 单位:Pa·s-1)、6 h变温 (红线, 单位:℃) 与水汽水平辐合 (绿线, 单位:10-5g·kg-1·s-1) 的垂直分布
(a)3日14:00, (b)3日20:00, (c)4日02:00, (d)4日08:00
Fig. 6 The vertical section from 500 to 1000 hPa along AB in Fig. 2a of pseudo-equivalent potential temperatures gradient (shaded, Δθse/Δp, Δp represents the vertical pressure interval of NCEP FNL data), pressure vertical velocity (black contours, unit:Pa·s-1), 6-h temperature tendency (red contours, unit:℃) and horizontal convergence of vapor (green contours, unit:10-5g·kg-1·s-1) in 2005
(a)1400 BT 3 Dec, (b)2000 BT 3 Dec, (c)0200 BT 4 Dec, (d)0800 BT 4 Dec
图 8 2008年12月3—5日海效应暴雪过程中CloudSat卫星沿图 3中CD, EF, GH给出的冰水混合物含量及冰粒子有效半径分布
(a)3日12:00沿CD冰水混合物含量, (b)3日12:00沿CD冰粒子有效半径,(c)5日02:00沿EF冰水混合物含量, (d)5日02:00沿EF冰粒子有效半径,(e)5日13:00沿GH冰水混合物含量, (f)5日13:00沿GH冰粒子有效半径
Fig. 8 Vertical section of the CloudSat observations for the process during 3—5 Dec 2008 along CE, EF, GH in Fig. 3
(a) ice-water mixture content along CD at 1200 BT 3 Dec, (b) ice effective radius along CD at 1200 BT 3 Dec, (c) ice-water mixture content along EF at 0200 BT 5 Dec, (d) ice effective radius along EF at 0200 BT 5 Dec, (e) ice-water mixture content along GH at 1300 BT 5 Dec, (f) ice effective radius along GH at 1300 BT 5 Dec
表 1 2001—2010年山东半岛典型海效应暴雪过程
Table 1 Typical sea-effect snowstorm processes over Shandong Peninsula from 2001 to 2010
过程 日期 最大降雪
站点降雪量/mm 云团初始时次 生成源地 500 hPa
天气形势850 hPa
高空风向1 2001-11-26 成山头 13.9 2001-11-25T10:00 渤海湾和莱州湾附近 西风槽 WNW 2 2002-11-18 文登 18.4 2002-11-17T04:00 辽东湾附近 冷涡 NNW 3 2003-01-04 文登 15.3 2003-01-03T01:00 渤海中部 冷涡 NW 4 2004-01-21 烟台 11.3 2004-01-20T14:00 渤海中部 西风槽 NNW 5 2005-12-04 荣成 27.0 2005-12-03T21:00 渤海中部 冷涡 NW 6 2005-12-06
2005-12-07烟台
威海21.0
24.42005-12-05T20:00 渤海中部 先槽后冷涡 WNW 7 2005-12-11
2005-12-12
2005-12-13烟台
文登
文登12.4
12.6
12.62005-12-10T20:00 渤海中部 冷涡 NW 8 2005-12-21 威海 18.3 2005-12-20T20:00 渤海中部 冷涡 WNW 9 2006-12-17 牟平 13.4 2006-12-16T12:00 渤海中部 西风槽 NW 10 2008-11-19 文登 10.9 2008-11-17T23:00 渤海中部 冷涡 NW 11 2008-12-05 牟平 26.5 2008-12-04T08:00 渤海湾和莱州湾附近 冷涡 NW 12 2010-12-30 荣成 22.6 2010-12-29T17:00 辽东湾附近 冷涡 NNW -
[1] Petterssen, Calabrese P A.On some weather influences due to warming of the air by the Great Lakes in winter. Journal of Meteorology, 1959, 16(6):646-652. doi: 10.1175/1520-0469(1959)016<0646:OSWIDT>2.0.CO;2 [2] McVehill G E, Peace R L.Some Studies of Lake Effect Snowfall from Lake Erie//Proceedings of 8th Conference on Great Lakes Research, 1965:262-272. [3] Higuehi K.The band structure of snowfalls. J Meteor Soc Japan, 1963, 41(1):53-70. doi: 10.2151/jmsj1923.41.1_53 [4] 曹钢锋, 张善君, 朱官忠, 等.山东天气分析与预报.北京:气象出版社, 1988:292-298. [5] 杨成芳, 王俊.利用单多普勒雷达资料做冷流暴雪的中尺度分析.高原气象, 2009, 28(5):1034-1043. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX200905010.htm [6] 林曲凤, 吴增茂, 梁玉海, 等.山东半岛一次强降雪过程中的中尺度特征分析.中国海洋大学学报:自然科学版, 2006, 36(6):908-914. http://www.cnki.com.cn/Article/CJFDTOTAL-NJQX200801007.htm [7] 朱先德, 吴增茂, 周淑玲, 等.2005年12月3—4日山东半岛暴雪准静止对流云带演变的分析.中国海洋大学学报:自然科学版, 2007, 37(增刊2):8-16. http://www.cnki.com.cn/Article/CJFDTOTAL-QDHY2007S2003.htm [8] 张勇, 寿绍文, 王咏青, 等.山东半岛一次强降雪过程的中尺度特征.南京气象学院学报, 2008, 31(1):51-60. http://www.cnki.com.cn/Article/CJFDTOTAL-NJQX200801007.htm [9] 于群, 周发琇, 王启.海洋影响下的山东半岛冷流降雪.华东师范大学学报, 2009(3):160-169. http://www.cnki.com.cn/Article/CJFDTOTAL-HDSZ200903021.htm [10] 李刚, 党英娜, 袁海豹.烟台冷流强降雪天气预报指标统计分析.山东气象, 2007, 27(3):24-27. http://www.cnki.com.cn/Article/CJFDTOTAL-SDQX200703008.htm [11] 崔宜少, 张丰启, 李建华, 等.2005年山东半岛连续三次冷流暴雪过程的分析.气象科学, 2008, 28(4):395-401. http://www.cnki.com.cn/Article/CJFDTOTAL-QXKX200804006.htm [12] 方宗义, 覃丹宇.暴雨云团的卫星监测和研究进展.应用气象学报, 2006, 17(5):583-593. doi: 10.11898/1001-7313.20060501 [13] 刘健, 张文建, 朱元竞, 等.中尺度强暴雨云团云特征的多种卫星资料综合分析.应用气象学报, 2007, 18(2):158-164. doi: 10.11898/1001-7313.20070228 [14] 胡列群, 黄镇, 黄慰军, 等.MODIS数据云相态反演在一次暴雪过程中的应用.应用气象学报, 2012, 23(5):609-613. doi: 10.11898/1001-7313.20120512 [15] 周淑玲, 朱先德, 符长静, 等.山东半岛典型冷涡暴雪个例对流云及风场特征的观测与模拟.高原气象, 2009, 28(4):935-944. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX200904026.htm [16] 李建华, 崔宜少, 单宝臣.山东半岛低空冷流降雪分析研究.气象, 2007, 33(5):49-55. doi: 10.7519/j.issn.1000-0526.2007.05.007 [17] 周淑玲, 丛美环, 吴增茂, 等.2005年12月3—21日山东半岛持续性暴雪特征及维持机制.应用气象学报, 2008, 19(4):444-453. doi: 10.11898/1001-7313.20080408 [18] Peace R L, Sykes R B.Mesoscale study of a lake effect snow storm. Mon Wea Rev, 1966, 94:495-507. doi: 10.1175/1520-0493(1966)094<0495:MSOALE>2.3.CO;2 [19] Braham R R.The midwest snow storm of 8—11 December 1977. Mon Wea Rev, 1983, 111:253-272. doi: 10.1175/1520-0493(1983)111<0253:TMSSOD>2.0.CO;2 [20] Forbes G S, Merritt J H.Mesoscale vortices over the Great Lakes in wintertime. Mon Wea Rev, 1984, 112:377-381. doi: 10.1175/1520-0493(1984)112<0377:MVOTGL>2.0.CO;2 [21] David A R K, Ronald A S.A satellite study of cloud-band frequencies over the Great Lakes. J Appl Meteor, 1995, 34(9):2083-2090. doi: 10.1175/1520-0450(1995)034<2083:ASSOCB>2.0.CO;2 [22] Sento N, Koyuru I, Ryohei M, et al.A classification of snow clouds by Doppler radar observations at Nagaoka. Japan SOLA, 2005, 1:161-164. doi: 10.2151/sola.2005-042 [23] Masataka M, Yoshinori Y, Takayo M, et al.The precipitation process in convective cells embedded in deep snow bands over the sea of Japan. J Meteor Soc Japan, 2003, 81(3):515-531. doi: 10.2151/jmsj.81.515 [24] David M S, Derek S A, David J S, et al.Snowbands during the cold-air outbreak of 23 January 2003. Mon Wea Rev, 2004, 132:827-842. doi: 10.1175/1520-0493(2004)132<0827:SDTCOO>2.0.CO;2 [25] Joshua J S, Kristovich A R, Hjelmfelt M R.Boundary layer and microphysical influences of natural cloud seeding on a lake-effect snow storm. Mon Wea Rev, 2006, 134(7):1842-1858. doi: 10.1175/MWR3151.1 [26] [2010-12-31].http://weather.is.kochi-u.ac.jp/sat. [27] [2010-12-31].http://dss.ucar.edu.datazone.dsszone/ds083.2. [28] [2010-12-31].http://weather.cod.edu, http://www.atmos.albany.edu与中国海洋大学气象系VSAT接收站. [29] [2008-12-05].http://www.cloudsat.cira.colostate.edu/data_dist/OrderData.php. [30] 周毓荃, 赵殊慧.CloudSat卫星及其在天气和云观测分析中的应用.南京气象学院学报, 2008, 31(5):603-614. http://www.cnki.com.cn/Article/CJFDTOTAL-NJQX200805000.htm [31] 尚博, 周毓荃, 刘建朝, 等.基于Cloudsat的降水和非降水云垂直特征.应用气象学报, 2012, 23(1):1-9. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20120101&flag=1 [32] 谢显泉.渤海冬季的冷流低云.气象, 1980, 6(2):25. doi: 10.7519/j.issn.1000-0526.1980.02.013 [33] 张剑英.冬季半岛地区"冷流低云"的云图特征.山东气象, 1983(4):21-29. http://www.cnki.com.cn/Article/CJFDTOTAL-SDQX198304005.htm [34] 徐中华, 张修平.层积云降雪.山东气象, 1990(3):27-29. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX199010012.htm [35] 杨成芳. 渤海海效应暴雪的多尺度研究. 南京: 南京信息工程大学, 2010. [36] 杨成芳, 周雪松.渤海海效应暴雪微物理过程的数值模拟.中国海洋大学学报:自然科学版, 2012, 42(增刊):10-17. http://www.cnki.com.cn/Article/CJFDTOTAL-QDHY2012S1003.htm [37] 朱营礼, 吴增茂, 林曲凤, 等.山东半岛冷流暴雪过程的个例分析.中国海洋大学学报:自然科学版, 2010, 40(增刊):1-7. http://www.cnki.com.cn/Article/CJFDTOTAL-QDHY2010S1002.htm [38] 杨成芳. 冷流暴雪的研究进展. 山东省气象局、中国海洋大学2011年联合学术交流会, 2011. [39] 肖现, 廖菲, 肖辉, 等.北京对流性降水的雨滴尺寸分布瞬时特征与雷达降水的关系.热带气象学报, 2010, 26(4):445-451. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX201004008.htm