Global (50°S-50°N) distribution of water vapor observed by COSMIC GPS RO: Comparison with GPS radiosonde, NCEP, ERA-Interim, and JRA-25 reanalysis data sets

被引:64
|
作者
Kishore, P. [2 ]
Ratnam, M. Venkat [1 ]
Namboothiri, S. P. [3 ]
Velicogna, Isabella [2 ]
Basha, Ghouse [1 ]
Jiang, J. H. [4 ]
Igarashi, K. [5 ]
Rao, S. V. B. [6 ]
Sivakumar, V. [7 ]
机构
[1] Govt India, Dept Space, Natl Atmospher Res Lab, Tirupati, Andhra Pradesh, India
[2] Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA
[3] SASTRA Univ, Sch Elect & Elect Engn, Tanjavur, India
[4] CALTECH, Jet Prop Lab, Pasadena, CA USA
[5] Assoc Radio Ind & Business ARIB, Tokyo, Japan
[6] Sri Venkateswara Univ, Dept Phys, Tirupati 517502, Andhra Pradesh, India
[7] CSIR, Natl Laser Ctr, ZA-0001 Pretoria, South Africa
关键词
Water vapor; Radiosonde; GPS RO; Reanalysis; LOWER TROPOSPHERE; TEMPERATURE DATA; TEMPORAL HOMOGENIZATION; OCCULTATION SIGNALS; REFRACTIVITY BIAS; RELATIVE-HUMIDITY; ATMOSPHERE; CLIMATE; TRENDS; VALIDATION;
D O I
10.1016/j.jastp.2011.04.017
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
In this study, global (50 degrees S-50 degrees N) distribution of water vapor is investigated using COSMIC GPS RO measurements. Detailed comparisons have been made between COSMIC and high resolution GPS radiosonde measurements across 13 tropical stations and model outputs (ERA-Interim, NCEP, and JRA-25 reanalyses data sets). In comparison with independent techniques like radiosonde (Vaisala), it is found that COSMIC GPS RO wet profiles are accurate up to 7-8 km (assuming radiosonde as standard technique). In general, comparisons with corresponding seasonal means of model outputs are qualitatively in good agreement, although they differ quantitatively especially over convective regions of South America, Africa, and Indonesia. In tropical latitudes, the COSMIC specific humidity values are higher than the model outputs. Among various model outputs, ERA-Interim data set show near realistic features to that observed by COSMIC GPS RO measurements. Large asymmetry in the specific humidity distribution is observed between northern and southern hemispheres. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1849 / 1860
页数:12
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