气候变化领域集成服务门户(CCPortal): Evaluation of cloud effects on air temperature estimation using MODIS LST based on ground measurements over the Tibetan Plateau

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DOI	10.5194/acp-16-13681-2016
	Evaluation of cloud effects on air temperature estimation using MODIS LST based on ground measurements over the Tibetan Plateau
	Zhang, Hongbo; Zhang, Fan; Zhang, Guoqing; He, Xiaobo; Tian, Lide
通讯作者	Zhang, HB (通讯作者)
发表日期	2016
ISSN	1680-7316
EISSN	1680-7324
起始页码	13681
结束页码	13696
卷号	16 期号:21
英文摘要	Moderate Resolution Imaging Spectroradiometer (MODIS) daytime and nighttime land surface temperature (LST) data are often used as proxies for estimating daily maximum (T-max) and minimum (T-min) air temperatures, especially for remote mountainous areas due to the sparseness of ground measurements. However, the Tibetan Plateau (TP) has a high daily cloud cover fraction (>45 %), which may affect the air temperature (T-air) estimation accuracy. This study comprehensively analyzes the effects of clouds on T-air estimation based on MODIS LST using detailed half-hourly ground measurements and daily meteorological station observations collected from the TP. It is shown that erroneous rates of MODIS nighttime cloud detection are obviously higher than those achieved in daytime. Large errors in MODIS nighttime LST data were found to be introduced by undetected clouds and thus reduce the T-min estimation accuracy. However, for T-max estimation, clouds are mainly found to reduce the estimation accuracy by affecting the essential relationship between T-max and daytime LST. The errors of T-max estimation are obviously larger than those of T-min and could be attributed to larger MODIS daytime LST errors that result from higher degrees of LST heterogeneity within MODIS pixel compared to those of nighttime LST. Constraining MODIS observations to non-cloudy observations can efficiently screen data samples for accurate T-min estimation using MODIS nighttime LST. As a result, the present study reveals the effects of clouds on T-max and T-min estimation through MODIS daytime and nighttime LST, respectively, so as to help improve the T-air estimation accuracy and alleviate the severe air temperature data sparseness issues over the TP.
关键词	LAND-SURFACE TEMPERATURE ESTIMATING DAILY MAXIMUM TEMPORAL VARIATIONS ENERGY-BALANCE CLEAR-SKY IN-SITU PRODUCTS VALIDATION SVALBARD MINIMUM
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000387119200001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
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/258658
推荐引用方式 GB/T 7714	Zhang, Hongbo,Zhang, Fan,Zhang, Guoqing,et al. Evaluation of cloud effects on air temperature estimation using MODIS LST based on ground measurements over the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2016,16(21).
APA	Zhang, Hongbo,Zhang, Fan,Zhang, Guoqing,He, Xiaobo,&Tian, Lide.(2016).Evaluation of cloud effects on air temperature estimation using MODIS LST based on ground measurements over the Tibetan Plateau.ATMOSPHERIC CHEMISTRY AND PHYSICS,16(21).
MLA	Zhang, Hongbo,et al."Evaluation of cloud effects on air temperature estimation using MODIS LST based on ground measurements over the Tibetan Plateau".ATMOSPHERIC CHEMISTRY AND PHYSICS 16.21(2016).