A test, using atmospheric data, of a method for estimating oceanic eddy diffusivity
A test, using atmospheric data, of a method for estimating oceanic eddy diffusivity
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使用大气数据估算海洋涡流扩散率方法的测试
DOI：
10.1029/1998gl900142
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发表时间：
1998
影响因子：
5.2
通讯作者：
I. Held
中科院分区：
文献类型：
--
作者：
P. Kushner;I. Held
G. Holloway提出了一种简单的方法，利用卫星测量海面高度变化来估计海洋示踪剂的有效水平涡扩散率。在该方法中，假设扩散系数按r.m.s.涡旋地转流函数进行标度。这种方法应类似地适用于大气环境，在这种环境中，数据集和模式可以很好地解析高能涡旋，并且可以直接计算有效扩散率和示踪剂通量。我们使用低对流层每日大气再分析数据对Holloway的方法进行了评估，并发现在给定高度，该方法成功地产生了大气感热通量发散部分的估计值，在相当均匀的比例因子范围内。
G. Holloway has proposed a simple method to estimate the effective horizontal eddy diffusivity for oceanic tracers using satellite measurements of sea‐surface height variability. In this method, the diffusivity is assumed to scale as the r.m.s. eddy geostrophic streamfunction. This method should apply analogously in an atmospheric context, in which the energetic eddies are well resolved in data sets and models, and in which both the effective diffusivity and tracer fluxes can be directly calculated. We evaluate Holloway's method using lower‐tropospheric daily atmospheric reanalysis data, and find that at a given height the method succesfully yields estimates of the divergent part of the atmospheric sensible heat flux, to within a fairly uniform scaling factor.