气候变化领域集成服务门户(CCPortal): On the use of GPS measurements for Moderate Resolution Imaging Spectrometer precipitable water vapor evaluation over southern Tibet

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DOI	10.1029/2011JD016160
	On the use of GPS measurements for Moderate Resolution Imaging Spectrometer precipitable water vapor evaluation over southern Tibet
	Lu, Ning; Qin, Jun; Yang, Kun; Gao, Yang; Xu, Xiangde; Koike, Toshio
通讯作者	Lu, N (通讯作者)
发表日期	2011
ISSN	2169-897X
EISSN	2169-8996
卷号	116
英文摘要	Precipitable water vapor (PWV) derived from Moderate Resolution Imaging Spectroradiometer (MODIS) near-infrared measurements from Terra and Aqua satellites have not been evaluated over southern Tibet, which has an elevated and complex topography. This study uses ground measurements from a network of 22 GPS receivers to evaluate the accuracy of MODIS PWV over this region. The evaluation shows that both the Terra and Aqua MODIS PWV have a high correlation with GPS measurements, but they generally tend to overestimate water vapor under clear-sky conditions, with scale factors from 1.06 to 1.19 and root mean square errors from 2.1 to 3.19 mm. The overestimation is mainly attributed to the systematic bias of MODIS PWV at sites below 3000 m, which increases with increasing water vapor, especially during the monsoon season, when the summer monsoon brings a large amount of water vapor from the tropical ocean to southern Tibet. In contrast, MODIS PWV at sites above 3000 m matches well with the GPS PWV. A linear fit model that was proposed and employed in previous studies is used to correct the errors of MODIS PWV at low sites. The performance of MODIS PWV is improved at each low site after the correction. The corrected MODIS PWV can represent the monthly variation of daily average GPS PWV within a 2% error. This evaluation study should facilitate the use of MODIS-derived water vapor in the models that calculate radiative forcing and simulate climate change over Tibet and its surrounding areas.
关键词	PLATEAU TEMPERATURE SYSTEM MODIS TRANSPORT NETWORK TRENDS
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000298255300003
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257924
推荐引用方式 GB/T 7714	Lu, Ning,Qin, Jun,Yang, Kun,et al. On the use of GPS measurements for Moderate Resolution Imaging Spectrometer precipitable water vapor evaluation over southern Tibet[J]. 中国科学院青藏高原研究所,2011,116.
APA	Lu, Ning,Qin, Jun,Yang, Kun,Gao, Yang,Xu, Xiangde,&Koike, Toshio.(2011).On the use of GPS measurements for Moderate Resolution Imaging Spectrometer precipitable water vapor evaluation over southern Tibet.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,116.
MLA	Lu, Ning,et al."On the use of GPS measurements for Moderate Resolution Imaging Spectrometer precipitable water vapor evaluation over southern Tibet".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 116(2011).