双月刊

ISSN 1006-9895

CN 11-1768/O4

地球系统模式CAS-ESM 1.0对1月 热带太平洋大洋环流异常模态的评估
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1.中国科学院大气物理研究所;2.解放军32021部队;3.大气环流与短期气候预测实验室;4.解放军91001部队

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国家重点研发计划高性能计算项目


Evaluation of Earth System Model CAS-ESM 1.0 for Ocean Circulation Anomalies Modes of the Tropical Pacific Ocean in Jan
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1.Unit32021,PLA,Beijing;2.Laboratory of Atmospheric Circulation and Short-range Climate Forecast,College of Meteorology and Oceanography,National University of Defense Technology;3.Unit91001,PLA

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    摘要:

    本文利用中国科学院CAS-ESM 1.0地球系统模式historical(cmip6)试验模拟的1922-2005年共84年的结果,对1月份热带太平洋上层流场作了复经验正交函数(EOF)分解,并与SODA(Simple Ocean Data Assimilation)资料的相应结果作了对比讨论,以考察该模式对赤道大洋上层环流异常的模拟能力,得到主要结论如下:该复EOF分解前3模态方差贡献为53.5%、12.9%、9.5%,累积方差贡献为75.9%,该累积方差贡献比SODA资料的要高。第一、二模态空间场与该资料的相比总体相像,流场异常都为赤道所俘获,在俘获区内该异常均以偏纬向流为主;差异在于本文赤道俘获区范围要较该资料大,该异常的经向流分量及越赤道流也较该资料明显。第一、二模态实时间系数序列无线性变化趋势而该资料的则有;其年际变化都与该资料相近,均有3-5年周期,这是厄尔尼诺/南方涛动(ENSO)循环的反映;第一、二模态年代际变化均不明显。第一、二模态次表层海温异常在太平洋赤道上呈纬向偶极子、三极子结构,并相应于东部型、中部型ENSO的海温异常;如此可称之为东部型、中部型ENSO模态;ENSO的非对称性在第一模态中表现明显,且与实况相符。该模式对热带太平洋上层流场异常模拟总的说来表现较佳。

    Abstract:

    In this paper, the data of the historical (cmip6) experiment of the earth system :model CAS-ESM 1.0 are used,which are 84 years in total from 1922 to 2005. Combined complex Empirical Orthogonal Function (CEOF) analysis is applied to the upper circulation anomalies in the tropical Pacific Ocean in January, and the simulation results are compared with the SODA (Simple Ocean Data Assimilation) data to examine the simulation ability of the model for the upper equatorial ocean flow field. The main conclusions are as follows: The variance contribution of the first three modes of the CEOF decomposition are 53.5%, 12.9% and 9.5%, respectively. The cumulative variance contribution is 75.9 %, which is higher than the SODA data. The first and second eigenvector pattern is generally similar to that of the SODA data. The anomalous flow fields are captured by the equator, which are dominated by the partial latitudinal flow in the capture region. The difference is that the equatorial capture area in this paper is larger than that of the SODA data, and the longitudinal flow component and the cross-equatorial flow are also more obvious. There is no linear trend in the real time coefficient sequence of the first and second modes in this paper, but there is this trend of the SODA data. The inter-annual variation of CEOF modes is the similar to that of the SODA data. The inter-annual variation of 3-5 years in the first and second mode is a reflection of ENSO (El Ni?o-Southern Oscillation). The inter-decadal variations of the first and second modes are not obvious. The dynamic temperature anomalies of the first and second modes in the subsurface layer of equatorial Pacific Ocean show the distribution of dipole and three-pole respectively, and corresponding to Sea Temperature Anomaly of the eastern and central ENSO. The first and second modes can be called the eastern and central ENSO modes. The asymmetry of ENSO is obvious in the first mode and accords with the real situation. The earth system model performs well in simulating the upper flow field of the tropical Pacific Ocean.

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历史
  • 收稿日期:2021-01-28
  • 最后修改日期:2022-05-08
  • 录用日期:2022-09-14
  • 在线发布日期: 2022-09-15
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