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STUDIES OF THE VERTICAL STRUCTURE MODEL AND THE MICROWAVE ATTENUATION OF CLOUDS AND PRECIPITATION OVER TROPICAL OCEAN AREA 下载免费PDF全文
Using radiosonde data and other related observations in the TOGA-COARE IOP(fromNovember 1,1992 to February 28,1993),the microwave attenuation of non-precipitating clouds isinvestigated based on microwave radiative transfer model(MRTM)at the specific frequencies of6.8,10.65,13.9,19.35,22.235,37.0,85.5 and 90.0 GHz.Besides,utilizing the data of theairborne radar and radiometer at 13.8 GHz in the IOP(Intensive Observation Period),verticalstructure models for different types of precipitating clouds are obtained,and also the microwaveattenuation of precipitating cloud is studied.Some statistical characteristics of 13.8 GHzmicrowave path integrated attenuation for stratiform and convective precipitating clouds arepresented.The results given here are valuable for the spaceborne microwave remote sensing ofprecipitation,and the cloud and precipitation attenuation corrections in the spaceborne microwaveremote sensing of earth surface over tropical ocean area. 相似文献
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In this paper we use a 10-layer radiation transfer model to systematically investigate the relation between brightness temperature and the rainfall rates at 37 GHz, including various viewing of microwave (MW) remote sensing and different surface condition, with main focus on the influence of the structure of ice-phase layer. The results show that the quantitative rainfall measurement can not be reliably obtained over the land from spuceborne radiometer at this wavelength and the structures of ice layer are very important in determining the "observed" brightness temperature for the spaceborne MW remote sensing. 相似文献
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北方局地夏末气溶胶光学特性综合观测分析 总被引:4,自引:1,他引:4
本文对中国北方相近地理经度不同纬度的三个试验点(内蒙草原生态定位站、北京、新乡)夏末季节大气气溶胶特性进行了地面粒子计数和整层光学遥感等综合观测。分析结果表明,这三个试验点地面和整层气溶胶数浓度通常有内蒙较小,北京居中,新乡最大的特征。文中提出了浓度比这个参量,它可以定量描述地面源气溶胶对整层大气气溶胶的相对贡献。据此分析可知内蒙地面源较弱,与该地区人类活动稀少相对应。由浓度比推测,新乡除近地面城市空气污染较严重外,滨临的黄河河面水汽蒸发作用也是促成气溶胶浓度增大的原因。 相似文献
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本文对两个不同尺度的Lorenz系统,通过引入一个耦合参数α把它们连接起来,并在二维参数空间α×r(Rayleigh数)中讨论了所建立的耦合系统的解的分叉过程。参数α在[0,1]区间中取值。当α=0时,耦合系统与著名的三模Lorenz系统相对应;当α=1时,则与一个包含两个Lorenz元的系统相对应。文章选取了三个不同的r值,研究了α从0变到1时,从单Lorenz系统的解到双Lorenz系统的解的非线性演化过程。 相似文献
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用机载雷达资料反演雨空间结构 总被引:2,自引:0,他引:2
机载雷达可以方便地跟踪观测对象,并且可以观测有些地基雷达较难观测的区域( 如海洋) ,因此近年来在大气遥感领域得到越来越广泛的应用。由于应用的需要,机载雷达使用的一般为 X 波段或 Ku 波段的频率,而该波段的电磁波穿过雨区时会受到衰减,需寻找算法进行订正。对于单束单频雷达,k Z 和k Z S算法具有很好的应用前景。将k Z、k Z S应用到在西太平洋进行的国际大型科学考察实验 T O G A/ C O A R E 中1993 年1月和2 月间取得的机载雷达( 和星载雷达频率相近) 实测数据进行雨空间分布的研究。 相似文献
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中国科学院长春净月潭遥感试验场是对国内外开放的进行遥感实验研究的场地。为了高质量地进行对地定量遥感,必须了解该场上空大气气溶胶的光学特性,以便进行有效的大气订正。另一方面大气气溶胶本身也是遥感的对象。为提供这一背景性信息,本工作利用试验场所装备的太阳直接辐照光谱仪在1990年(无火山活动期)与1991年(强火山爆发期)两年进行的观测,经分析整理和反演推导,获得该站上空气溶胶引起的光学厚度(消光)谱和由此反演得到的气溶胶粒子谱分布。由于两年分别代表火山平静和活动期的情况,所得结果将为该地区遥感大气订正提供依据,同时可供其它北半球中纬地区参考。 相似文献
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In this paper,data of solar direct spectral radiance observation in summer and autumn of 1990 and 1991 were usedto derive the average atmospheric extinction spectra for very clear days each year.The difference of these two extinctionspectra is obvious and considered as the contribution of volcanic cloud resulting from Pinatobu's volcanic eruption inmiddle June of 1991.This average size distribution of volcanic cloud was retrieved from the difference spectra and givenin this paper which will be useful for estimation and modeling of the effects of volcanic eruption. 相似文献
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