An Improved Method for Modeling Spatial Distribution of δD in Surface Snow over Antarctic Ice Sheet  

作　　者：WANG Yetang HOU Shugui Bjom GRIGHOLM SONG Linlin 

机构地区：[1]State Key Laboratory of Cryospheric Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China [2]Climate Change Institute, University of Maine, Orono ME 04469, USA

出　　处：《Chinese Geographical Science》2009年第2期120-125,共6页中国地理科学（英文版）

基　　金：Under the auspices of National Natural Science Foundation of China (No. 40825017, 40576001);100 Talents Project of Chinese Academy of Sciences;National Key Technologies R&D Program of China (No. 2006BAB18B01)

摘　　要：Using the recent compilation of the isotopic composition data of surface snow of Antarctic ice sheet, we proposed an improved interpolation method of δD, which utilizes geographical factors （i.e., latitude and altitude） as the primary predictors and incorporates inverse distance weighting （IDW） technique. The method was applied to a high-resolution digital elevation model （DEM） to produce a grid map of multi-year mean δD values with lkm spatial resolution for Antarctica. The mean absolute deviation between observed and estimated data in the map is about 5.4‰, and the standard deviation is 9‰. The resulting δD pattern resembles well known characteristics such as the depletion of the heavy isotopes with increasing latitude and distance from coast line, but also reveals the complex topographic effects.Using the recent compilation of the isotopic composition data of surface snow of Antarctic ice sheet, we proposed an improved interpolation method of δD, which utilizes geographical factors (i.e., latitude and altitude) as the primary predictors and incorporates inverse distance weighting (IDW) technique. The method was applied to a high-resolution digital elevation model (DEM) to produce a grid map of multi-year mean δD values with 1km spatial resolution for Antarctica. The mean absolute deviation between observed and estimated data in the map is about 5.4‰, and the standard deviation is 9‰. The resulting δD pattern resembles well known characteristics such as the depletion of the heavy isotopes with increasing latitude and distance from coast line, but also reveals the complex topographic effects.

关 键 词：δD surface snow ice sheet ANTARCTICA 

分 类 号：P941.61[天文地球—自然地理学] S435.621[农业科学—农业昆虫与害虫防治]