干旱区生态环境知识资源中心(Arid): 陇中黄土高原地表能量不平衡特征及其影响机制研究

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	陇中黄土高原地表能量不平衡特征及其影响机制研究
其他题名	Research on Characteristic of Surface Energy Imbalance in Loess Plateau in Middle Part of Gansu and Its Effect Mechanism
	李宏宇 1; 张强1 ; 赵建华 1; 王胜 1; 史晋森 2
来源期刊	高原气象
ISSN	1000-0534
出版年	2010
卷号	29 期号:5 页码:1153-1162
中文摘要	利用兰州大学半干旱气候与环境观测站(SACOL)2008年夏季的观测资料,分析了陇中黄土高原地表能量不平衡特征及其影响机制,计算了地表和5 cm深处土壤热通量板之间的热储存,并对地表能量不平衡特征重新进行了计算和评价.当把土壤热储存作为地表能量收支的一部分考虑后,不平衡差额绝对值平均降低了23 W.m-2,能量不闭合度平均减小了0.104,利用最小二乘法(OLS)进行线性回归得到的平均不闭合度减小了0.085.从白天和晚上的能量不闭合度频率分布也能够看出,土壤热储存对地表能量收支平衡有很大改善.但即使考虑了土壤热储存项,地表能量不闭合仍然很明显.除了土壤热储存,边界层大气不同形式的输送能力作为对地气能量通量交换过程中的重要因素,对能量不平衡也会产生深远影响.结果显示,地表能量不闭合度分别与垂直速度w,水平风速u和对流速度尺度w*有较密切的关系.涡动相关法通量计算中常通过坐标旋转强迫垂直速度变为零,然而非零的垂直速度和垂直平流是真实存在的,忽略垂直平流热量输送是产生地表能量不平衡的重要原因
英文摘要	Characteristics of the surface energy unbalance and its effect mechanism in the Loess Plateau in the middle part of Gansu were analyzed based on the observed data at the Semi-Arid Climate and Environment Observatory of Lanzhou University(SACOL) in the summer of 2008.The soil heat storage between the ground surface and heat flux plate at 5 cm depth was calculated from some soil thermal parameters, and the condition of surface energy inbalance was reestimated. When the soil heat storage as an energy budget component is taken into the equation of surface energy balance, the mean absolute value of surface energy balance residual decreases 23 W·m-2 and the mean unclosure of energy balance is reduced by 0.104. Moreover, the unclosure of energy balance obtained by using OLS(Ordinary Least Squares) linear regression method decreases 0.085. Overall, the storage term can improve the surface energy budget condition and makes a large contribution to the unclosure of energy balance, which can also be seen from the frequency distributions of the unclosure of surface energy during the day time and night time. However, even if the soil heat storage is taken into account, the surface energy imbalance still exists and it remains apparent. Except for the soil heat storage, different forms of atmospheric transport capacity as factors affecting land-air energy exchange process, also have an impact on the surface enegy imbalance. The results indicate that the relationships are obvious among the unclosure of surface energy and three velocity scale parameters including vertical velocity, wind speed and convective velocity scale, respectively. Vertical advection is neglected by rotating the coordinate system, however non-zero values of vertical velocity and vertical advection are realistic. The neglect of vertical advection heat transfor is to result in an important reason of surface energy imbalance
中文关键词	陇中黄土高原 ; 地表能量不平衡 ; 土壤热储存 ; 垂直速度 ; 对流速度尺度
英文关键词	Loess Plateau in the middle part of Gansu Surface energy imbalance Soil heat storage Vertical velocity Convective velocity scale
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:4056114
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225218
作者单位	1.兰州大学大气科学学院, 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 730000, 中国; 2.兰州大学大气科学学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	李宏宇,张强,赵建华,等. 陇中黄土高原地表能量不平衡特征及其影响机制研究[J]. 兰州大学,2010,29(5):1153-1162.
APA	李宏宇,张强,赵建华,王胜,&史晋森.(2010).陇中黄土高原地表能量不平衡特征及其影响机制研究.高原气象,29(5),1153-1162.
MLA	李宏宇,et al."陇中黄土高原地表能量不平衡特征及其影响机制研究".高原气象 29.5(2010):1153-1162.