农田和草地下垫面上附加阻尼kB-1变化特征的分析

鞠英芹-; 徐自为; 刘绍民; 卢俐; 徐同仁; 刘寿东

doi:10.7522/j.issn.1000-0534.2013.00015

摘要

利用2010年阿柔站（草地）和馆陶站（农田）的观测资料，运用阻尼法估算不同下垫面的热传输附加阻尼(kB^-1)，分析日变化特征，探讨用一个固定kB^-1值来估算感热通量，最后将估算值与M_1958、M_1963、M_1982、M_1989、M_1998、M_2002和M_2007七种参数化方案进行比较。结果表明，在不同下垫面上， kB-1变化明显。除玉米下垫面、玉米和裸地混合下垫面外，其余下垫面kB-1均有抛物线型日变化，与地气温差具有相关性。在植被下垫面，可用中值或均值的kB-1计算感热通量。将不同参数化方案计算的感热通量与观测值之间进行比较发现，在裸地下垫面，与观测值最接近的参数化方案是M_1998方案；在混合地表则为M_1958, M_1963和M_2007方案。

关键词： 热力学附加阻尼; 涡动相关仪; 参数化方案; 感热通量

本文引用格式

鞠英芹- , 徐自为 , 刘绍民 , 卢俐 , 徐同仁 , 刘寿东 . 农田和草地下垫面上附加阻尼kB^-1变化特征的分析[J]. 高原气象, 2014 , 33(1) : 55 -65 . DOI: 10.7522/j.issn.1000-0534.2013.00015

Abstract

Based on the data of Eddy Covariance (EC) system and Automatic Weather Station (AWS) collected at Guantao (farmland) and A’rou (grass) sites in 2010， the method of estimating kB^-1 is impedance method．The results have been used to analyze the daily variation characteristics of kB^-1 and to explore the possibility of using a fixed value to estimate sensible heat flux. And then， the estimates are compared with the values from the value of using seven parameterization schemes of M_1958, M_1963, M_1982, M_1989, M_1989, M_2002, and M_2007． The result shows that the values of kB^-1 have a obvious range on different underlying surfaces．kB-1 has a diurnal variation and also a good correlation with surface-air temperature difference, except maize and maize/bare soil. On the vegetation, the sensible heat flux is estimated with a median or mean value of kB^-1 . Comparing sensible heat flux using different parameterization schemes with the observed values, results of M_1998 are most close to the observe value on bare soil while in mixed terrain surface, M_1958, M_1963, and M_2007 are close to the observe value.

Key words： kB^-1

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