Evaluation of three temperature profiles of a sublayer scheme to simulate SST diurnal cycle in a global ocean general circulation model

Evaluation of three temperature profiles of a sublayer scheme to simulate SST diurnal cycle in a global ocean general circulation model
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评估全球海洋环流模型中模拟海表温度日循环的子层方案的三个温度剖面

DOI:
10.1002/2017ms000927
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发表时间:
2017-08
影响因子:
6.8
通讯作者:
Song Zhenya
Song Zhenya
中科院分区:
地球科学2区
文献类型:
--
作者:
Yang Xiaodan;Song Zhenya

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海表面温度的日循环在上层海洋和气候系统中起着重要的作用。在具有粗垂直分辨率的海洋环流模式中,描述海温日变化的一种方法是将海温的日循环参数化,而不考虑混合层内的详细动态过程。本文首次将Schiller和Godfrey(2005)的诊断性子层参数化方案引入到全球海洋环流模式(NEMO)中来模拟海温的日循环。此外,还评估了三种不同的子层温度分布(恒定、线性和指数型)。与卫星SST和系泊温度资料的对比表明,具有指数型温度廓线的参数化方案显示了最合理的日增温模拟结果,显著提高了SST日幅度大于1.0°C的概率(从恒温廓线的1.7%提高到13.4%),并且各季节的平均偏差都减小到0.16°C以下,与观测结果一致。
The diurnal cycle of sea surface temperature (SST) plays an important role in the upper ocean and climate system. One way to represents the diurnal variation of SST in Ocean General Circulation Models (OGCMs) with coarse vertical resolution is to parameterize the diurnal cycle of SST without considering detailed dynamic processes within the mixed layer. In this study, a diagnostic sublayer parameterization scheme following Schiller and Godfrey (2005) was incorporated into a global OGCM (NEMO), for the first time, to simulate the diurnal cycle of SST. Moreover, three different sublayer temperature profiles (constant, linear, and exponential) were evaluated. Comparison with satellite SST and mooring temperature data indicated that the parameterization scheme with an exponential temperature profile showed the most reasonable diurnal warming simulation results, significantly improving the probability of (from 1.7% with constant temperature profile to 13.4%) diurnal SST amplitude larger than 1.0°C. Furthermore, the mean biases in each season were all reduced to less than 0.16°C, in good agreement with observations.
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