气候变化领域集成服务门户(CCPortal): 西藏纳木错流域冻土环境初步研究

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	西藏纳木错流域冻土环境初步研究
其他题名	A Primary Study of the Environment of Frozen Ground in the Nam Co Basin, Tibet
	田克明; 刘景时; 康世昌; 李潮流
发表日期	2006
ISSN	1001-8166
卷号	21 期号:12 页码:1324-1332
中文摘要	利用在西藏纳木错流域念青唐古拉山北坡(NQN，海拔5400m)和西北保吉乡(BJ，海拔4730m)布设的两台带有四层土壤探头自动气象站(AWS)2005--2006年冬季10个月观测数据进行了统计分析。结果表明：观测期间NQN日及月平均气温均低于BJ，但变化幅度均小于BJ，土壤冻结时间比BJ长，两处的气温梯度为0．31℃／100m。与安多月平均气温比较，推断NQN存在高山多年冻土。NQN大气-土壤及土壤内热传输速度快于BJ；冻结期内土壤中未冻水含量在0～-2．5℃时发生跃变且与土壤温度存在较好的线性关系；相同深度处NQN土未冻水含量较小。土壤温度日变化在0～40cm深度处较明显，40cm深度以下变化很小，未冻水含量日变化在5cm深度较明显，20cm以下变化微弱。利用两观测点冻结深度(研)与冻结积温(疋)的良好相关建立模型，NQN为：D_(f-n)=0．0016T_g＋1．69，R~2=0．9958；BJ为：D_(f-k)=0．002E＋1．13，R~2=0．9424，并由此推断出两观测点最大季节冻结深度分别为1．69m和1．13m。
英文摘要	Based on the data from two automatic weather stations (AWS) with 4-layers of soil probes located at an elevation of 5, 400m at the northern slope of Mt. Nyenquentanglha (N) and at 4, 720m at Boji (B) in the northwest of the Nam Co Lake, this paper analyzed the environment of the frozen ground around the lake basin. It concludes that from September 2005 to May. 2006, the daily temperature and monthly temperature at the N were both lower than those at the B. However, amplitude of daily temperature at the N was smaller than that at the BJ. The freezing period of ground at the N is longer than that at the B. From September to next May, their air temperature lapse rate is 0.31℃/100m smaller than that in the atmosphere. Results show alpine permafrost existed at the N by comparing monthly temperature with the Ando, Tibet. Heat conduction between air and soil and within soil at the N was faster than that at the B. During freezing period, a powerful relationship was found between the soil unfrozen water content and soil temperature, the unfrozen water content abruptly declined at 0~2℃. The Diurnal variation of soil temperature is dramatic at the 0~40cm depth, while no trend below 40cm; so does soil unfrozen water content at 5cm depth, no trend below 20cm. Based on the close correlation between a soil freezing depth (D(subscript f)) and a cumulative frost temperature (T(subscript g)), the model was proposed as the following: D(subscript f-n)=0016T(subscript g)+1.69 at the N and D(subscript f-b)=0.002T(subscript g)+1.13 at the B, using the model, the maximum freezing depth were estimated by 1.69m and 1.13m at the two sites, respectively.
关键词	纳木错流域冻土土壤含水量土壤温度最大季节冻深
英文关键词	Nam Co basin;Frozen grotmd;Freezing-thawing process;Maximum seasonal freezing depth
语种	中文
来源期刊	地球科学进展
来源机构	中国科学院西北资源环境生态研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/89729
推荐引用方式 GB/T 7714	田克明,刘景时,康世昌,等. 西藏纳木错流域冻土环境初步研究[J]. 中国科学院西北资源环境生态研究院,2006,21(12):1324-1332.
APA	田克明,刘景时,康世昌,&李潮流.(2006).西藏纳木错流域冻土环境初步研究.地球科学进展,21(12),1324-1332.
MLA	田克明,et al."西藏纳木错流域冻土环境初步研究".地球科学进展 21.12(2006):1324-1332.