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简单生物圈模式(SiB2)中湍流能量通量对近地层两类阻抗系数的敏感性研究 被引量:1

Sensitivity of Surface Energy Fluxes to Two Resistance Coefficients in Simple Biosphere Model(SiB2)
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摘要 陆—气之间的能量交换是通过近地层湍流热量和水汽通量来实现的。以往的研究表明近地层阻抗对湍流能量通量有着不同程度的影响,但是关于陆面模式中阻抗系数的取值范围却始终没有统一的标准。为了深入了解简单生物圈模式(SiB2)中近地层阻抗系数取值变化对湍流能量通量的影响,我们以那曲站为例,分别采用传统的逐个因子分析法和考虑参数间相互作用的部分因子分析法定量地研究了夏季该观测站近地层湍流能量通量分别对冠层阻抗系数C1和地表阻抗系数C2的敏感性响应。结果表明,感热通量对地表阻抗系数C2更为敏感,而潜热通量则对冠层阻抗系数C1较为敏感;感热通量随C1增加而增大,随C2增加而减小,而潜热通量则随C1或C2的增加而减小;不管是感热通量还是潜热通量,它们对阻抗系数的敏感度随阻抗系数的增大而减小,而对阻抗系数的相对敏感度则随阻抗系数的增大而增大。最后,结合那曲站夏季下垫面稀疏短草的分布特点分析了造成感热通量和潜热通量敏感变化各异的原因。 Surface energy fluxes play a significant role in land-air interaction. To quantify the influence of resistance coefficients on surface energy fluxes in the Simple Biosphere Model (SiB2), the sensitivities of sensible heat flux (H) andlatent heat flux (LE) to resistance coefficients are examined by using the one-factor-at-a-time method and fractional factorial analysis method. The results show that, i) H is more sensitive to C2 (called ground to canopy air-space resistance coefficient) while LE is more sensitive to C1 (named bulk canopy boundary-layer resistance coefficient); ii) H increases with increasing C1 and decreases with increasing C2, while LE always decreases with increasing C1 or increasing C2; and iii) the sensitivities of both H and LE decrease with increasing coefficients and their relative sensitivities increase with increasing coefficients. Furthermore, the reasonable explanation about the sensitivity of H and LE are given considering the distribution of land cover and vegetation in Nagqu.
出处 《大气科学》 CSCD 北大核心 2012年第5期1053-1062,共10页 Chinese Journal of Atmospheric Sciences
基金 国家自然科学基金资助项目40874047 40975009 国家重点基础研究发展项目2012CB417203
关键词 感热通量 潜热通量 阻抗系数 陆面过程 简单生物圈模式(SiB2) 敏感性 sensible heat flux, latent heat flux, resistance coefficient, land surface process, Simple Biosphere Model(SiB2), sensitivity
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