On the relationship between the Bowen ratio and the near-surface air temperature
On the relationship between the Bowen ratio and the near-surface air temperature
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DOI：
10.1007/s00704-011-0520-y
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发表时间：
2012-04
影响因子：
3.4
通讯作者：
Jaeil Cho;T. Oki;P. Yeh;Wonsik Kim;S. Kanae;K. Otsuki
中科院分区：
文献类型：
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作者：
Jaeil Cho;T. Oki;P. Yeh;Wonsik Kim;S. Kanae;K. Otsuki
陆面能量分配对近地面气温的敏感性是了解陆面与气候系统相互作用的关键问题。因此，需要利用从各种气候和生态系统收集的现场观测数据进行研究。从这些经验分析得出的关系是有用的发展准确的估计方法的能量划分。在这项研究中，Taon陆面能量分区的影响进行了评估，使用通量测量数据汇编从全球网络的涡度相关塔网站（FLUXNET）。通过对25个FLUXNET站点（60个站点年）资料的分析，发现波文比与用空气动力学和气候学阻力参数归一化的总表面阻力基本上呈线性关系，其斜率和截距取决于Ta。在较暖的大气中，能量分配对地表条件的变化不太敏感。波文比与Ta呈负相关，在植被较少的地面上，在低水汽压差和低接收辐射能条件下，这种关系更强。本研究获得的经验结果预计有助于更好地理解Ta增加下的交替表面能分配。
The sensitivity of land surface energy partitioning to near-surface air temperature (Ta) is a critical issue to understand the interaction between land surface and climatic system. Thus, studies with in situ observed data compiled from various climates and ecosystems are required. The relations derived from such empirical analyses are useful for developing accurate estimation methods of energy partitioning. In this study, the effect ofTaon land surface energy partitioning is evaluated by using flux measurement data compiled from a global network of eddy covariance tower sites (FLUXNET). According to the analysis of 25 FLUXNET sites (60 site-years) data, the Bowen ratio is found to have a linear relation with the bulk surface resistance normalized by aerodynamic and climatological resistance parameters in general, of which the slope and intercept are dependent onTa. Energy partitioning in warmer atmosphere is less sensitive to changes in land surface conditions. In addition, a negative relation is found between Bowen ratio andTa, and this relation is stronger above less vegetated surface and under low vapor pressure deficit and low received radiative energy condition. The empirical results obtained in this study are expected to be useful in gaining better understanding of alternating surface energy partitioning under increasingTa.