Radiation partitioning and its relation to environmental factors above a meadow ecosystem on the Qinghai-Tibetan Plateau

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	Radiation partitioning and its relation to environmental factors above a meadow ecosystem on the Qinghai-Tibetan Plateau
	Zhang, Xiaochun 1; Gu, Song 1,2; Zhao, Xinquan 2; Cui, Xiaoyong 3; Zhao, Liang 2; Xu, Shixiao 2; Du, Mingyuan 4; Jiang, Sha 1; Gao, Yubao 1; Ma, Chun 5; Tang, Yanhong 6
	2010-05-20
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN	0148-0227
卷号	115
文章类型	Article
摘要	Understanding the energy balance on the Qinghai-Tibetan Plateau is essential for better prediction of global climate change. To characterize the energy balance on the plateau, we examined the radiation partitioning over a Kobresia meadow, the most widely distributed vegetation on the plateau, for the period from 2002 to 2005. The incident solar radiation (R(s)) and net radiation (R(n)) averaged 6298 and 2779 MJ m(-2) yr(-1), respectively. The albedo averaged 0.220 annually, with a slightly low value of 0.202 in the growing season from May to September. An increase in soil water or leaf area index was correlated with a decrease of albedo over the meadow. The annual solar radiation lost 34% as longwave radiation, which was higher than values reported for lowland grasslands. The annual radiation efficiency (R(n)/R(s)) over the meadow, at an average of 0.44, was, however, much lower than that for lowland grasslands. The net longwave radiation (L(n)) and the normalized effective radiation (L(n)/R(s)) over the meadow were much higher than that for the global surface or for lowland grasslands, indicating that the longwave exchange between alpine meadow and atmosphere is the most important component of energy losses. A path analysis suggests that the water vapor pressure, air temperature, and cloud cover are the major factors governing the variations of both the net radiation and the net longwave radiation in the alpine meadow ecosystem.; Understanding the energy balance on the Qinghai-Tibetan Plateau is essential for better prediction of global climate change. To characterize the energy balance on the plateau, we examined the radiation partitioning over a Kobresia meadow, the most widely distributed vegetation on the plateau, for the period from 2002 to 2005. The incident solar radiation (R-s) and net radiation (R-n) averaged 6298 and 2779 MJ m(-2) yr(-1), respectively. The albedo averaged 0.220 annually, with a slightly low value of 0.202 in the growing season from May to September. An increase in soil water or leaf area index was correlated with a decrease of albedo over the meadow. The annual solar radiation lost 34% as longwave radiation, which was higher than values reported for lowland grasslands. The annual radiation efficiency (R-n/R-s) over the meadow, at an average of 0.44, was, however, much lower than that for lowland grasslands. The net longwave radiation (L-n) and the normalized effective radiation (L-n/R-s) over the meadow were much higher than that for the global surface or for lowland grasslands, indicating that the longwave exchange between alpine meadow and atmosphere is the most important component of energy losses. A path analysis suggests that the water vapor pressure, air temperature, and cloud cover are the major factors governing the variations of both the net radiation and the net longwave radiation in the alpine meadow ecosystem.
WOS标题词	Science & Technology ; Physical Sciences
关键词[WOS]	SOUTH-WEST GERMANY ; NET-RADIATION ; ENERGY-EXCHANGE ; TEMPERATE GRASSLAND ; DIFFERENT ALTITUDES ; SOLAR-RADIATION ; CARBON-DIOXIDE ; GREAT-PLAINS ; SURFACE ; BALANCE
收录类别	SCI
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000277965500003
引用统计	被引频次：21[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1706
专题	中国科学院西北高原生物研究所
作者单位	1.Nankai Univ, Coll Life Sci, Tianjin 300071, Peoples R China 2.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China 3.Chinese Acad Sci, Coll Resources & Environm, Grad Sch, Beijing 100079, Peoples R China 4.Natl Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan 5.Nankai Univ, Coll Environm Sci & Engn, Tianjin 300071, Peoples R China 6.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan
推荐引用方式 GB/T 7714	Zhang, Xiaochun,Gu, Song,Zhao, Xinquan,et al. Radiation partitioning and its relation to environmental factors above a meadow ecosystem on the Qinghai-Tibetan Plateau[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2010,115.
APA	Zhang, Xiaochun.,Gu, Song.,Zhao, Xinquan.,Cui, Xiaoyong.,Zhao, Liang.,...&Tang, Yanhong.(2010).Radiation partitioning and its relation to environmental factors above a meadow ecosystem on the Qinghai-Tibetan Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,115.
MLA	Zhang, Xiaochun,et al."Radiation partitioning and its relation to environmental factors above a meadow ecosystem on the Qinghai-Tibetan Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 115(2010).