干旱区生态环境知识资源中心(Arid): 河西走廊中部干旱区陆面水分和辐射特征研究

Arid

	河西走廊中部干旱区陆面水分和辐射特征研究
其他题名	Characteristics of Land Surface Moisture and Radiation in Arid Region in the Middle of Hexi Corridor
	孙昭萱; 张强
来源期刊	高原气象
ISSN	1000-0534
出版年	2010
卷号	29 期号:6 页码:1423-1430
中文摘要	利用河西张掖试验站2005年11月2006年10月的陆面过程观测资料,研究了河西中部干旱区土壤温度,土壤湿度,降水量,地表反照率,地表辐射分量和土壤热通量等物理量的年变化和日变化特征及其影响机制,分析了土壤湿度与降水量的相关关系,地表反照率与降水量及土壤湿度的相关关系.结果表明:干旱荒漠地区土壤温度对太阳加热的响应比较迅速,而且年较差和日较差也比较大.地表层土壤主要受蒸发和降水的影响,土壤湿度变化响应得较快,而深层土壤湿度基本不受地表影响,在冬季土壤湿度变化对降水的响应要滞后12个月.降水量与5 cm土壤湿度的相关最好,与深层50cm的土壤湿度相关最差.地表反照率的起伏变化与降水过程对应的比较好,反照率的谷值正好对应降水过程比较集中的时段.地表反照率随土壤湿度的增大是减小的,两者的相关系数达到了0.7346.干旱荒漠区辐射分量年变化幅度普遍比较大,年平均日变化特征表现为非常典型而平滑的日循环形态.土壤冬季向大气输出热量而夏季转变为大气向土壤输入热量,且输入的热量要大于输出.随着季节变化,土壤热通量的日最大值冬季出现最晚,夏季最早,与20 cm土壤温度的变化趋势基本一致
英文摘要	Utilizing the data of land-surface process obtained in the middle of Zhangye of arid region in Hexi Corridor during about one year from November 2005 to October 2006, the annual and diurnal variation characteristics and influence mechanism of the soil temperature, soil moisture, amount of precipitation, surface albedo, surface radiation and soil heat flux are studied. The relationship of soil moisture with amount of precipitation, surface albedo with amount of precipitation and soil moisture are also analyzed. The results show that in the arid desert region the soil temperature responses to the solar heating rapidly, and annual and diurnal ranges are large. The soil moisture of surface soil affected by evaporation and precipitation changes quickly, while the deep soil moisture is always unaffected. The response of soil moisture to the precipitation in winter delays 1 or 2 months. The relationship of precipitation with 5 cm soil moisture is the best, but is the worst with 50 cm soil moisture. The fluctuations of surface albedo well relate to the precipitation well and the extreme values are just corresponded to the concentrated precipitation periods. Surface albedo increases with the soil moisture decreasing, and their correlation coefficient gets up 0.7346.The annual variations of surface radiation in the arid desert region are generally large. The characteristics of diurnal variation through a year show a typical smooth daily cycle curve. The heat is exported from soil to atmosphere in winter while imported from atmosphere to soil in summer. The import is lager than export. The diurnal maximum value of soil heat flux is the latest in winter and earliest in summer, which change tendency is generally consistent with 20 cm soil temperature
中文关键词	河西走廊 ; 干旱荒漠区 ; 陆面水分特征 ; 辐射特征
英文关键词	Hexi corridor Arid desert region Characteristic of land surface moisture Characteristic of surface radiation
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:4096836
来源机构	中国气象局兰州干旱气象研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225223
作者单位	中国气象局兰州干旱研究所, 甘肃省干旱气候变化与减灾重点实验室;;中国气象局干旱气候变化与减灾重点开放实验室, 兰州, 甘肃 730020, 中国
推荐引用方式 GB/T 7714	孙昭萱,张强. 河西走廊中部干旱区陆面水分和辐射特征研究[J]. 中国气象局兰州干旱气象研究所,2010,29(6):1423-1430.
APA	孙昭萱,&张强.(2010).河西走廊中部干旱区陆面水分和辐射特征研究.高原气象,29(6),1423-1430.
MLA	孙昭萱,et al."河西走廊中部干旱区陆面水分和辐射特征研究".高原气象 29.6(2010):1423-1430.