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对流性降水云微波辐射特性
Radiative Characteristics of Convective Precipitating Cloud
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摘要: 结合MM5模式和三维微波辐射传输模式, 对2003年7月9日宜昌地区一次典型的中尺度降水中心的对流性降水云微波辐射特性进行研究。结果表明:MM5模式模拟的降水量和落区与实况一致，模拟的水凝物廓线也与TMI反演值接近，85.5 GHz通道辐射亮温与TMI实测情况相近。85.5 GHz通道亮温与地面雨强相关性很弱, 受云中云冰和雪花的散射降温作用显著, 由于其他粒子的综合作用以及斜角观测造成的位置偏移, 霰粒子对该通道亮温散射作用不明显。19.35 GHz通道亮温随雨强增加先升温后降温; 与霰粒子含量表现出明显的负相关关系。37.0 GHz通道亮温随雨强的增加而降温, 雨强大于20 mm/h后达到饱和, 主要受雨水降温作用影响。倾斜观测比天顶垂直观测产生更低的亮温低值中心, 且频率越高, 低值中心的偏移越严重。Abstract: Radiative characteristics of convective precipitating cloud can be used for the classification of convective/stratiform precipitation and for the algorithm to retrieval the rain rate from brightness temperature observed by satellite remote sensors. The typical convective cloud system in Yichang area on 9 July 2003 is simulated with MM5 model and its upwelling radiative brightness temperature is simulated with Monte-Carlo 3D microwave radiative transfer model. The columnar precipitation simulated by MM5 model shows consilient with that observed by rain gauges. As for the cloud microphysical particles, it is found that except for the cloud ice, the contents of the cloud water, precipitable water and precipitable ice particles from the MM5 are nearly equivalent to that retrieved from TMI data. The simulated Tb85V from M-C model also indicates similar distribution with the observed by TMI. Tb85 is sensitive primarily to the precipitated ice and snow content in clouds. The weak correction between Tb85 and the surface rain rate is found. Given the rain rate less than about 5 mm per hour in this case, Tb19 rises since the rain rate increases. However it descends with the rain rate increasing while the rain rate is over 5 mm per hour. Because of the notable intercorrelation between Tb19 and graupel content, it can be regarded as the indicator of surface rain rate in the strong convective center, at least as the estimator of columnar precipitated water content at upper layers. The feeble correlation between Tb85 and graupel columnar content happens because the upwelling Tb85 is synthetically affected by the various hydrometers such as the emission from cloud water and the scattering from ice particles, in addition the shift caused by oblique FOV. Tb37 has obvious correlation with the surface rain rate when it is less than 20 mm per hour and is saturated when the rain rate is over 20 mm per hour. Cloud water and precipitated rain in the convective cloud play roles on Tb37. The Tb at each channel shows the synthetical results of tilted cloud cell or oblique FOV. The higher frequency, the lower Tb values show and the more replacement happens due to the oblique FOV. Tb85 observed at 52.8° angle is even 15 K less than that received at zenith, and the shift can reach 25 km as well as the title cloud cell.
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Key words:
- MM5;
- radiation transfer model;
- radiative characteristics
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图 1 2003年7月9日20:05模拟区域上TM1的实测 (a) 和模式模拟的85.5 GHz (b) 垂直极化通道亮温
(单位: K; 图a中箭头为TM1的运行轨道方向, 图b中箭头为模拟的轨道方向)
Fig. 1 Brigluness temperature at 85:5 GHz V-polarized channel observed by TM1 and simulated by Monte-Carlo radiative transfer model at 20:05 on 9 July 2003
( unit: K; the arrow in Fig.a is the observed orbital direction of TM1, the arrow in Fig.b is the simmlated orbital direction of Monte-rarlo)
图 2 2003年7月9日 16:00 Domain3模拟的整个区域 (观测角度设为52.8°)
(a) 云水、雨水和霰的总和垂直积分含量 (阴影部分) 及云冰和雪花含量的总和垂直积分含量 (等值线部分, 单位: kg·m-2), (b) 地面降水率 (阴影部分, 单位: mm/h) 及19.35 GHz通道的垂直极化辐射亮温 (等值线部分, 单位: K), (c) 85.5 GHz通道的垂直极化辐射亮温(单位: K), (d) 37.0 GHz通道的辐射亮温 (单位: K)
Fig. 2 Simulated area with 52.8° nadir scan view at 16:00 9 July 2003 on Domain3
(a) the columnar content of combined cloud water, cloud rain and graupel (shaded) and the columnar content of combined cloud ice and snow (contour, unit: kg·m-2), (b) rain rate (shaded, unit: mm/h) and simulated brightness temperature at 19.35 GHz V-polarized channel (contour, unit: K), (c) the simulated brightness temperaiure at 85.5 GHz V-polarized channel (unit: K), (d) the simulated brightness temperature at 19.35 GHz V-polarized channel (unit: K)
图 3 2003年7月9日16:00 y=32垂直剖面上云水、雨水、霰、冰晶和雪花含量 (单位:g·m-3) 的分布以及地面雨量 (单位: mm/h) 、0°和52.8°观测角时 85.5, 37.0, 19.35 GHz 3 个通道的垂直极化亮温 Tb85, Tb37, Tbl9 (单位: K)
Fig. 3 The y-z cross section of the contents of cloud water, cloud rain, graupel, cloud ice snow (unit: g·m-3) and the rain rate (unit: mm/h) with the brightness temperatures at 85.5, 37.0 GHz and 19.35 GHz Tb85, Tb37, Tbl9 V-polarized channels at 0°and 52.8° nadir scan view respectively (unit: K)
表 1 MM5模式参数化设置
Table 1 The parameteration schemes on Domains within MM5 model
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[1] Adler R F, Yeh Haw-Young M, Prasad N, et al. Microwave simulation of a tropical rainfall system with a three-dimensional cloud model. J Appl Meteor,1991,30:924-953. doi: 10.1175/1520-0450-30.7.924 [2] Cheng M. Estimaton of Precipitation Using Satellite, Radar and Rain Gauge. Bristol:University of Bristol,1994. [3] Wu Rongzhang, Weinman J A. Microwave radiances from precipitating clouds containing aspherical ice, combined phase, and liquid hydrometeors. J Geo Res,1984,89:7170-7178. doi: 10.1029/JD089iD05p07170 [4] 吴庆梅,程明虎,苗春生.用TRMM资料研究江淮、华南降水的微波特性.应用气象学报,2003,14(2):206-214. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20030225&flag=1 [5] 姚展予,王广河,游来光, 等.寿县地区云中液态水含量的微波遥感.应用气象学报,2001,12(增刊):88-95. http://kns.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFQ&dbname=CJFD2001&filename=YYQX2001S1011&v=MjE1ODVMMmZaT1JvRnl2bVY3N0pQRFRhZHJHNEh0Q3ZybzlFWllSOGVYMUx1eFlTN0RoMVQzcVRyV00xRnJDVVI= [6] 姚展予,李万彪,朱元竞, 等.用TRMM卫星微波成像仪遥感云中液态水.应用气象学报,2003,14(增刊):19-26. http://kns.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFQ&dbname=CJFD2003&filename=YYQX2003S1002&v=MDkwODNMdXhZUzdEaDFUM3FUcldNMUZyQ1VSTDJmWk9Sb0Z5dm1WN3pJUERUYWRyRzRIdEt2cm85RlpvUjhlWDE= [7] 黄容,程明虎,崔哲虎, 等.用云和辐射传输模式研究对流性降水云微物理及辐射特性.气象,2003,30(3):7-11. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX200403001.htm [8] Liu Q, Simmer C, Ruprecht E. Three-dimensional radiative transfer effects of clouds in the microwave spectral range. J Geophys Res,1996,101:4289-4298. doi: 10.1029/95JD03421 [9] 周玉淑 ,高守亭 ,邓国 .江淮流域2003年强梅雨期的水汽输送特征分析.大气科学,2005,9(2):195-204. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK200502003.htm [10] 何会中,程明虎,周凤仙.0302号 (鲸鱼) 台风降水和水粒子空间分布的三维结构特征.大气科学,2006,30(3):491-503. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK200603011.htm [11] 丁伟钰,陈子通.利用TRMM资料分析2002年登陆广东的热带气旋降水分布特征.应用气象学报,2008,19(4):437-444. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20040453&flag=1 [12] 陈廷娣,王连仲,窦贤康.TRMM卫星与机载雷达在降雨反演中的数据对比个例研究.应用气象学报,2008,19(4):454-462. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20080409&flag=1 [13] Reisner J, Rasmussen R M, Bruintjes R T. Explecit forecasting of supercooled liquid water in winter storms using the MM5 mesoscale model. Q J R Meteor Soc,1998,124:1071-1107. doi: 10.1002/(ISSN)1477-870X [14] 楼小凤,胡志晋,王鹏云, 等.中尺度模式云降水物理方案介绍.应用气象学报,2003,14(增刊):49-59. http://kns.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFQ&dbname=CJFD2003&filename=YYQX2003S1006&v=MjcyMDIxTHV4WVM3RGgxVDNxVHJXTTFGckNVUkwyZlpPUm9GeXZtVkwzTFBEVGFkckc0SHRLdnJvOUZZb1I4ZVg= [15] Lin Wenshi, Fong Soikun, Wu Chisheng, et al. A simulating study on Resolvable-scale microphysical parameterization in a mesoscale model. Adv Atmos Sci,2000,17(3):487-502. doi: 10.1007/s00376-000-0038-1 [16] Haferman J L, Krajewski W F, Smith T F, et al. Radiative transfer for a three-dimensional raining clouds. Applics Optics,1993,32:2795-2801. doi: 10.1364/AO.32.002795 [17] Roberti Laura, Haferman J L, Kummerow C. Microwave radiative transfer through horizontally inhomogeneous precipitating clouds. J Geo Res,1994,99:16707-16718. doi: 10.1029/94JD01150 [18] 罗云峰,张培昌,王振会.有云大气微波辐射传输模式反演辐射亮温的数值实验∥强风暴实验室.大气遥感技术论文集.北京:气象出版社,1997. [19] Hong Y, Haferman J L, Olson W S, et al. Microwave brightness temperatures from tilted convective systems. J Appl Meteorol,2000,39:983-998. doi: 10.1175/1520-0450(2000)039<0983:MBTFTC>2.0.CO;2 [20] Smith E A, Mugnai A, Cooper N J, et al. Foundations for statistical physical precipitation retrieval from passive microwave satellite measurement.PartⅠ:Brightness temperature properties of a time dependent cloud-radiation model. J Appl Meteor,1992,31(6):506-531. doi: 10.1175/1520-0450(1992)031<0506:FFSPPR>2.0.CO;2 [21] Mugnai A, Smith E A, Tripoli G T. Foundations for statistical physical precipitation retrieval from passive microwave satellite measurement.PartⅡ:Emission-source and generalized weighting-function properties of an time-dependent cloud-radiative model. J Appl Meteor,1993,32:17-39. doi: 10.1175/1520-0450(1993)032<0017:FFSPRF>2.0.CO;2 -
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