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Nelson方法在计算青藏高原地区冻结深度中的应用及修正

发表时间:2009-11-15  浏览量:1347  下载量:698
全部作者: 余莲,王澄海
作者单位: 兰州大学大气科学学院;中国科学院寒区旱区环境与工程研究所冰冻圈国家重点实验室
摘 要: 通过对Nelson指数在青藏高原地区的土壤未冻水含量响应试验,以及加强观测的土壤水热观测资料分析,得出一个在高原地区较好的温度参数化土壤未冻水含量方案,并应用到Nelson指数确定冻结深度。结果表明:该方案具有较好的适用性,用该参数化方案修正的Nelson指数计算值在833%的所选用站点偏差在22%以内,明显好于在研究范围尺度上将土壤湿度取常数的结果,显著地改进了对冻结深度的计算。尽管没有考虑积雪、植被等因素对冻结深度的影响,但在确定年尺度上的冻结深度变化时,得出的冻结期温度参数化土壤未冻水方案不失为一个获取土壤未冻水含量的良好途径。
关 键 词: 气象学;土壤水分; 冻结深度;土壤湿度参数化;Nelson指数;青藏高原
Title: Application and correction of Nelson method in calculating frozed depth of Tibet Plateau region
Author: YU Lian, WANG Chenghai
Organization: College of Atmospheric Sciences, Lanzhou University;State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences
Abstract: The paper investigated the response of Nelson index to unfrozen soil moisture in Tibet Plateau (TP) and analyzed the intensive observational soil moisture data in TP. Based on the experiments, one better scheme for parameterizing unfrozen water content by ground temperature was obtained, which was used in the Nelson index to estimate the frozen depth in TP. The results show that, in 83.3% of the sites, the errors of the results calculated by the Nelson index corrected by the parameterization scheme are less than 22%. Comparing to the schemes which involve constant soil moisture, the new method evidently decreases error between observed and calculated frozen depths. Although the effects of snow cover, vegetation and other factors were not considered, on annual scale, the corrected Nelson scheme can reproduce the variation of frozen depth during freezing period and is a good way for obtaining unfrozen water content in soil.
Key words: meteorology; soil moisture; frozen depth; soil moisture parameterized scheme; Nelson index; Tibet Plateau
发表期数: 2009年11月第21期
引用格式: 余莲,王澄海. Nelson方法在计算青藏高原地区冻结深度中的应用及修正[J]. 中国科技论文在线精品论文,2009,2(21):2267-2275.
 
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