大气对微波散射计回波信号衰减的修正方法研究   总被引：2，自引：0，他引：2  

孙瀛  郑淑卿 《台湾海峡》1995,14(3):199-215

为了使微波散射计测得的海面后向散射具有足够的精度，必须考虑大气对微波衰减的影响。大气对微波的衰减可以用微波射计来测定。本文将估算晴空、云和降雨天气下的衰减系，讨论计算海面发射率及用微波辐射计剩余亮温估算散射计工作频率下大气衰减的方法。  相似文献   

Microwave Remote Sensing of Tropical Cyclones from Space     

Kristina B. Katsaros  Paris W. Vachon  W. Timothy Liu  Peter G. Black 《Journal of Oceanography》2002,58(1):137-151

This article reviews several microwave instruments employed in research and analysis of tropical cyclones (TCs), typhoons, and hurricanes. The instruments discussed include scatterometers, microwave radiometers, synthetic aperture radars (SARs), and rain radar from space. Examples of the particular contribution by one or more of these instruments in analysis of several storms illustrate the comprehensive new views provided by the SeaWinds scatterometers, the detailed high-resolution wind field provided by RADARSAT-1 SAR, particularly inside and in the vicinity of hurricane “eyes,” and the presence of secondary flows in the region between rainbands in TCs. The high spatial resolution of precipitation data from the Tropical Rainfall Measuring Mission's rain radar, combined with scatterometer or SAR data, give a significant improvement in the details that can be seen from space, at the surface, and in the precipitating areas of TCs. The microwave instruments provide a penetrating view below the upper level cirrus clouds. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Validation of ERS scatterometer‐derived soil moisture data in the central part of the Duero Basin,Spain     

Antonio Ceballos  Klaus Scipal  Wolfgang Wagner  Jos Martínez‐Fernndez 《水文研究》2005,19(8):1549-1566

The objective of this study was to validate the soil moisture data derived from coarse‐resolution active microwave data (50 km) from the ERS scatterometer. The retrieval technique is based on a change detection method coupled with a data‐based modelling approach to account for seasonal vegetation dynamics. The technique is able to derive information about the soil moisture content corresponding to the degree of saturation of the topmost soil layer (∼5 cm). To estimate profile soil moisture contents down to 100 cm depth from the scatterometer data, a simple two‐layer water balance model is used, which generates a red noise‐like soil moisture spectrum. The retrieval technique had been successfully applied in the Ukraine in a previous study. In this paper, the performance of the model in a semi‐arid Mediterranean environment characterized by low annual precipitation (400 mm), hot dry summers and sandy soils is investigated. To this end, field measurements from the REMEDHUS soil moisture station network in the semi‐arid parts of the Duero Basin (Spain) were used. The results reveal a significant coefficient of determination (R² = 0·75) for the averaged 0–100 cm soil moisture profile and a root mean square error (RMSE) of 2·2 vol%. The spatial arrangement of the REMEDHUS soil moisture stations also allowed us to study the influence of the small‐scale variability of soil moisture within the ERS scatterometer footprint. The results show that the small‐scale variability in the study area is modest and can be explained in terms of texture fraction distribution in the soil profiles. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Neural network wind retrieval from ERS-1/2 scatterometer data   总被引：1，自引：1，他引：0  

LIN Mingsen  SONG Xingai  JIANG Xingwei 《海洋学报(英文版)》2006,25(3):35-39

1IntroductionSatellite observations of the ocean,includingobservation of sea surface wind fields,have tendedto be a perfect technology.Scatterometer is a prima-ry remote sensing sensor,which can get the globalscale information of wind.Other means of remot…  相似文献   

基于卫星遥感数据南海南部海洋表面流场反演          下载免费PDF全文

郑贵洲  潘子轩  孟亦菲  王红平 《地球科学》2021,46(1):341-349

海表流场可直接影响海表的气候变化,且对于研究海气相互作用、热通量输送等具有重要意义.通过利用Jason-2号与HY-2号卫星高度计数据以及Metop卫星的ASCAT与HY-2号卫星散射计数据反演海表流场.利用距离加权平均法生成分辨率为0.25°×0.25°的网格,通过数据融合分别得到海表高度场与海面风场,在此基础上构建...  相似文献   

The Southern Annular Mode and opposite-phased Basin Mode of the Southern Ocean circulation     

Yuji Iijima  Shigeru Aoki  Kunio Kutsuwada 《Journal of Oceanography》2009,65(1):53-60

Over the Southern Ocean the dominant modes of the atmospheric field are known as the Southern Annular Mode (SAM) or Antarctic Oscillation, and the Pacific South American (PSA) pattern. Statistical analysis of sea surface wind (SSW) from satellite observation revealed two leading modes of SAM-like and PSA patterns. In the high latitudes, the SAM-like pattern of the SSW had a large amplitude over the Bellingshausen Basin and Australian-Antarctic Basin, with opposite phase between the two basins. On the intraseasonal time scale, large-scale sea surface height (SSH) also had notable variability, showing a basin-scale anti-phase mode over the two basins. To explain the response of oceanic variations to these atmospheric modes, we analyzed the relationship between the dominant modes of wind stress and large-scale SSH on the intraseasonal time scale. The SAM-like pattern of wind stress was correlated with the SSH variation over the two basins. The SSH basin mode was most simply explained by a simple barotropic response to the SAM-like mode of wind stress, with the curl of opposite phase between the two basins. We conclude that the zonal asymmetry of the wind field of the SAM plays an important role in driving the antiphase SSH basin modes.  相似文献   

中国近海ASCAT风场反演结果验证分析     

沈春  项杰  蒋国荣  施伟来 《海洋预报》2013,30(4)

利用NCEP风场产品和dropsonde探测资料,对中国近海ASCAT全场和单点的风速反演精度进行验证分析.研究发现ASCAT反演风场与NCEP风场的风速、风向平均绝对偏差分别为2.06 m/s和21.98°;均方根误差分别为2.87 m/s和34.29°.两者风速反演精度较一致,风向误差相对偏大.ASCAT反演风场与dropsonde探测资料的风速、风向平均绝对偏差分别为1.55 m/s和3.43°;均方根误差分别为1.73 m/s和4.15°.ASCAT资料可以较好的反演台风风场.  相似文献   

A study of a new retrieval algorithm for measurement of oceanic windvectors field using satellite microwave scatterometer     

Lin Mingsen  Sun Ying  Zheng Shuqing 《海洋学报(英文版)》1998,17(3):305-319

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Numerical simulation of scatterometer assimilated wind and ocean wave in eastern China seas and adjacent waters     

李明悝侯一筠  尹宝树宋金宝 赵玮 《中国海洋湖沼学报》2006,24(1):42-47

Using the latest version of Mesoscale Modeling System (MM5v3), we assimilated wind data from the scatterometer and built a model to assimilate the wind field over eastern China seas and adjacent waters and applied the wave model WAVEWATCH-Ⅲ to test the sea area with assimilative wind and blended wind of QSCAT and NCEP as driving forces. High precision and resolution numerical wave results were obtained. Analysis indicated that if we replace the model wind result with the blended wind, better sea surface wind results and wave results could be obtained.  相似文献   

QuikSCAT散射计矢量风统计特征及南海大风遥感分析   总被引：18，自引：5，他引：18  

刘春霞  何溪澄 《热带气象学报》2003,19(Z1):107-117

主要分析了QuikSCAT散射计矢量风资料的统计特征,并利用该资料分析了南海大风频数的月变化、空间分布特征以及南海各月风场的空间分布特征.结果显示QuikSCAT矢量风在南海具有可信性;利用散射计风场资料分析发现在南海主要盛行两种风,即冬季东北风和夏季西南风,东北风最大中心在巴士海峡、台湾海峡;南海中南部存在东北季风的次大中心和西南季风的极大中心.  相似文献