气候变化领域集成服务门户(CCPortal): Correction of broadband snow albedo measurements affected by unknown slope and sensor tilts

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DOI	10.5194/tc-10-775-2016
	Correction of broadband snow albedo measurements affected by unknown slope and sensor tilts
	Weiser U.; Olefs M.; Schöner W.; Weyss G.; Hynek B.
发表日期	2016
ISSN	19940416
卷号	10 期号:2
英文摘要	Geometric effects induced by the underlying terrain slope or by tilt errors of the radiation sensors lead to an erroneous measurement of snow or ice albedo. Consequently, artificial diurnal albedo variations in the order of 1-20% are observed. The present paper proposes a general method to correct tilt errors of albedo measurements in cases where tilts of both the sensors and the slopes are not accurately measured or known. We demonstrate that atmospheric parameters for this correction model can either be taken from a nearby well-maintained and horizontally levelled measurement of global radiation or alternatively from a solar radiation model. In a next step the model is fitted to the measured data to determine tilts and directions of sensors and the underlying terrain slope. This then allows us to correct the measured albedo, the radiative balance and the energy balance. Depending on the direction of the slope and the sensors a comparison between measured and corrected albedo values reveals obvious over- or underestimations of albedo. It is also demonstrated that differences between measured and corrected albedo are generally highest for large solar zenith angles. © Author(s) 2016.
学科领域	albedo; energy balance; error analysis; global climate; radiation budget; sensor; slope angle; snow cover; solar radiation; terrain; zenith angle
语种	英语
scopus关键词	albedo; energy balance; error analysis; global climate; radiation budget; sensor; slope angle; snow cover; solar radiation; terrain; zenith angle
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119663
作者单位	Central Institute for Meteorology and Geodynamics (ZAMG), Vienna, Austria; Institute of Geography and Regional Research, University of Graz, Graz, Austria
推荐引用方式 GB/T 7714	Weiser U.,Olefs M.,Schöner W.,et al. Correction of broadband snow albedo measurements affected by unknown slope and sensor tilts[J],2016,10(2).
APA	Weiser U.,Olefs M.,Schöner W.,Weyss G.,&Hynek B..(2016).Correction of broadband snow albedo measurements affected by unknown slope and sensor tilts.Cryosphere,10(2).
MLA	Weiser U.,et al."Correction of broadband snow albedo measurements affected by unknown slope and sensor tilts".Cryosphere 10.2(2016).