地理与地理信息科学

2021, v.37(04) 37-44+50

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COSMIC掩星大气水汽廓线的质量分析
Quality Analysis of COSMIC Occultation Water Vapor Profile Data

陈冰;龚绍琦;张存杰;闵爱莲;王海君;韩静;
CHEN Bing;GONG Shao-qi;ZHANG Cun-jie;MIN Ai-lian;WANG Hai-jun;HAN Jing;School of Remote Sensing and Geomatics Engineering,Nanjing University of Information Science & Technology;Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province;National Climate Center,China Meteorological Administration;School of Environmental Science and Engineering,Nanjing University of Information Science & Technology;

摘要(Abstract):

COSMIC掩星大气产品的时空分辨率和垂直分辨率较高,可提高数值天气预报模型的精度并用于气候气象研究,但目前鲜有在全球范围内的验证分析。该文利用无线电探空数据评估COSMIC掩星探测系统反演的大气水汽压在不同高度、季节和纬度上的数据质量,并以COSMIC在近地面(925 hpa)和对流层顶(300 hpa)两个典型高度的水汽压数据分析全球水汽的时空分布特征。结果表明:1)对流层顶以下的COSMIC水汽压略低于探空水汽压值;COSMIC水汽压在近地面偏差较大,且随着高度的上升而减小,高空COSMIC水汽压与探空水汽压基本一致,对改进数值天气预报精度具有重要意义。2)COSMIC水汽压与探空水汽压的差异以夏季最大,且随着纬度升高偏差逐渐减小。3)COSMIC水汽压相对于探空水汽压的平均偏差、均方根误差和平均绝对百分比误差分别为-1.657~-1.088×10~(-5) hpa、0.005~4.189 hpa和24.553%~37.956%;全球COSMIC水汽压在两个典型高度的分布特征相似,且存在南北半球不对称性。
The atmospheric products of COSMIC occultation have the advantages of high spatio-temporal and vertical resolution, which can be used to improve the accuracy of numerical weather prediction models and climate and meteorological research.However, there are few studies on the evaluation of COSMIC occultation retrieval atmospheric water vapor products on global scale so far.This paper uses radiosonde data to evaluate the atmospheric water vapor product retrieved from COSMIC GPS occultation.The differences of water vapor pressure at different atmospheric vertical heights, seasons and latitudes are discussed, and then the temporal and spatial distribution patterns of COSMIC water vapor pressure at atmospheric heights of 925 hpa and 300 hpa are analyzed.It is found as follows.1) At the height below the top of the troposphere, the COSMIC water vapor pressure is slightly lower than the water vapor pressure measured by radiosonde.The water vapor pressure of COSMIC has a larger deviation with that of radiosonde near the ground and the deviation decreases as the height rises.The COSMIC water vapor pressure has good consistency with the radiosonde one, which is of great significance to improve the accuracy of numerical weather prediction.2) The difference of water vapor pressure between COSMIC and radiosonde is largest in summer, and small in spring, autumn and winter; the deviation of water vapor pressure between COSMIC and radiosonde in low latitude zone is larger, and the deviation decreases as the latitude increases.3)The MB,RMSE and MAPE of COSMIC water vapor pressure relative to those of radiosonde water vapor pressure are-1.657~-1.088×10~(-5) hpa, 0.005~4.189 hpa and 24.553%~37.956% respectively.The global distribution of COSMIC water vapor pressure at different atmospheric heights has similar distribution characteristics and the distribution of water vapor pressure is asymmetry in the northern and southern hemispheres.

关键词(KeyWords): COSMIC掩星;水汽廓线;质量分析;探空数据;时空分布
COSMIC occultation;water vapor profile;quality analysis;radiosonde data;spatio-temporal distribution

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基金项目(Foundation): 国家重点研发计划项目(2020YFA0608203);; 中国气象局西北区域人影建设研究试验项目(RYSY201907);; 海南省南海气象防灾减灾重点实验室开放基金项目(SCSF201909);; 中国气象局气象软科学重点项目(2021ZDIANXM19)

作者(Author): 陈冰;龚绍琦;张存杰;闵爱莲;王海君;韩静;
CHEN Bing;GONG Shao-qi;ZHANG Cun-jie;MIN Ai-lian;WANG Hai-jun;HAN Jing;School of Remote Sensing and Geomatics Engineering,Nanjing University of Information Science & Technology;Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province;National Climate Center,China Meteorological Administration;School of Environmental Science and Engineering,Nanjing University of Information Science & Technology;

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