一种基于不同表面强迫方式对CFSR表面通量资料进行修正的方法探讨

李昂; 张苗茵; 朱学明; 祖子清; 王辉

doi:10.3969/j.issn.0253-4193.2019.11.006

一种基于不同表面强迫方式对CFSR表面通量资料进行修正的方法探讨

doi: 10.3969/j.issn.0253-4193.2019.11.006

李昂^1,,
张苗茵¹,
朱学明^1, ,,
祖子清¹,
王辉¹

国家海洋环境预报中心国家海洋局海洋灾害预报技术研究重点实验室，北京 100081

基金项目: 国家重点研发计划（2017YFA0604203）；自然科学青年基金项目（41506040）。

详细信息

作者简介:
李昂（1988—），男，山东省济南市人，助理研究员，博士，主要从事中国近海海洋环流的研究。E-mail：1988liang@gmail.com

通讯作者:
朱学明，副研究员，博士，从事海洋环流和海洋环境的数值研究与预报。E-mail：zhuxm@nmefc.cn

中图分类号: P731.31
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- 文章访问数: 286
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- 被引次数: 0
出版历程
- 收稿日期: 2018-09-04
- 修回日期: 2018-12-24
- 网络出版日期: 2021-04-21
- 刊出日期: 2019-11-25

A research on the optimal approach of CFSR surface flux data correction based on different surface forcing modes

Key Laboratory of Research on Marine Hazards Forecasting, State Oceanic Administration, National Marine Environmental Forecasting Center, Beijing 100081, China

摘要

摘要: 海表面温度(SST)的变化是海气相互作用的重要体现，SST的准确模拟也是海洋内部温度模拟的基础。基于区域海洋模式，本文通过对比分析两种强迫方式对SST的模拟效果，诊断了各辐射场对SST模拟效果的贡献，基于EOF分析法提出了一种针对CFSR表面大气强迫辐射数据的修正方案，并获取一套高频辐射场修正数据。数值对比试验结果显示，利用COARE 3.0公式计算所得表面强迫的方式模拟的SST结果更好，其均方根误差比直接强迫方式降低约39%；潜热辐射差异是两种强迫方式对SST模拟效果差异的主要原因，感热辐射差异次之，同时对两者进行修正可以显著改进SST的模拟效果；而长波辐射的修正则对冬季的SST模拟效果改善比较明显，但贡献仍弱于潜热辐射。相对于海洋模式而言，准确可靠的大气强迫数据的选择要优于强迫方式的选择。
- 海表面温度 /
- CFSR /
- 表面大气强迫 /
- 热通量修正
Abstract: Sea surface temperature (SST) is an important expression of air-sea interaction, and accurate simulation of SST is also the foundation of ocean internal temperature prediction. This paper attempts to diagnose the contribution of radiation fields on SST simulation by comparing the results of SST driven by two different surface forcing modes employing the Regional Ocean Model System (ROMS). According to the EOF analysis method, a correction scheme on CFSR surface atmospheric forcing radiation data is proposed, and therefrom, a high frequency revised dataset of CFSR radiation flux is obtained. The comparison tests show that surface forcing derived from the COARE 3.0 formula mode improves simulating performance of SST, as the RMSE decreases by 39% comparing to direct forcing mode. Comparing the thermal radiation fields of the two forcing modes, it is found that latent radiation is the main reason for different performances of SST simulation, and following by the effect of sensible heat radiation difference. Correction of both two radiation fields could improve the SST simulation results significantly; and correction of longwave radiation shows a more significant effect in winter which is still weaker than that of correction of latent radiation. In comprehensive, the accurate dataset of surface forcing field is more effective than change the choice of forcing mode.
- sea surface temperature /
- CFSR /
- surface atmospheric forcing /
- heat flux correction

HTML全文

图 1 数值模拟区域及水深分布

Fig. 1 Numerical model domain and bathymetry

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图 2 2011年各月直接强迫和块体公式计算的SST模拟偏差比较

Fig. 2 Bias comparison of simulated SST by direct forcing and COARE 3.0 formula in 2011

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图 3 2011年不同试验方案下模拟SST的逐月平均的均方根误差比较

Fig. 3 The monthly mean RMSE comparison of simulated SST from different experiments in 2011

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图 4 2011年四季块体公式与直接强迫计算的各个热辐射通量差值分布

Fig. 4 Heat radiation fluxes differences by direct forcing and COARE 3.0 formula in 4 seasons of 2011

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图 5 试验3、4、5模拟的SST月平均偏差分布

Fig. 5 The monthly mean bias distributions of simulated SST from experiments 3, 4, and 5

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图 6 试验3、4、5模拟的SST逐月区域平均的均方根误差比较

Fig. 6 The monthly mean RMSE comparison of simulated SST from experiments 3, 4, and 5

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图 7 试验6、7、8模拟的SST月平均偏差分布

Fig. 7 The monthly mean bias distributions of simulated SST from experiments 6, 7, and 8

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图 8 各试验模拟的SST逐月区域平均的均方根误差比较

Fig. 8 The domain averaged monthly mean RMSE comparison of simulated SST from different experiments

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图 9 2011年潜热辐射差值场EOF分解第一模态空间分布（a）及其时间序列（b）

Fig. 9 The EOF first modespace distribution (a) and time series (b) of latent radiation differences in 2011

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图 10 1月（a）、4月（b）、7月（c）、10月（d）基于EOF分析法获得的净热辐射通量修正场分布

Fig. 10 Correction of net heat radiation flux based on EOF analysis in January (a), April (b), July (c), October (d)

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图 11 2011年、2012年直接强迫、块体公式计算、修正试验模拟的SST逐月区域平均的均方根误差比较

Fig. 11 The domain averaged monthly mean RMSE comparison of simulated SST by direct forcing, COARE 3.0 formula and corrected experiment in 2011 and 2012

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表 1 数值对比试验方案设置

Tab. 1 The scheme of numerical comparison experiments

	强迫方式	辐射场计算
	强迫方式	感热辐射	潜热辐射	长波辐射
试验1	块体公式计算	模式计算	模式计算	模式计算
试验2	直接强迫	直接提供	直接提供	直接提供
试验3	直接强迫	模式计算	直接提供	直接提供
试验4	直接强迫	直接提供	模式计算	直接提供
试验5	直接强迫	直接提供	直接提供	模式计算
试验6	直接强迫	模式计算	模式计算	直接提供
试验7	直接强迫	直接提供	模式计算	模式计算
试验8	直接强迫	模式计算	模式计算	模式计算
试验9	直接强迫	EOF修正	EOF修正	EOF修正

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表 2 2011年辐射差值场EOF分析各模态的方差贡献

Tab. 2 Variance contributions of each mode of radiation difference by EOF analysis in 2011

	感热辐射	潜热辐射	长波辐射
EOF1	37.6%	30.9%	33.8%
EOF2	14.3%	23.0%	17.3%
EOF3	9.5%	9.9%	12.0%
EOF4	4.8%	5.6%	6.3%
前3模态方差贡献合计	61.4%	63.8%	63.1%

下载: 导出CSV

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