CAS-ESM 1.0模式对7月份热带太平洋上层流场异常模态的模拟评估  

Simulation and Evaluation of the CAS-ESM 1.0 Model Used for Studying Upper Layer Flow-Field Abnormal Modes in the Tropical Pacific Ocean in July

作　　者：盖泳铭 卢姁 张东凌[4] 张铭[5] GAI Yongming;LU Xu;ZHANG Dongling;ZHANG Ming(Publicity and Education Center of the Ministry of Natural Resources,Beijing 100830;Unit 32021,PLA,Beijing 100094;Key Laboratory of Smart Earth,Beijing 100029;Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029;Laboratory of Atmospheric Circulation and Short-range Climate Forecast,College of Meteorology and Oceanography,National University of Defense Technology,Nanjing 211101)

机构地区：[1]自然资源部宣传教育中心,北京100830 [2]解放军32021部队,北京100094 [3]智慧地球重点实验室,北京100029 [4]中国科学院大气物理研究所,北京100029 [5]国防科技大学气象海洋学院大气环流与短期气候预测实验室,南京211101

出　　处：《气候与环境研究》2024年第6期723-734,共12页Climatic and Environmental Research

基　　金：国家重点研发计划高性能计算项目2016YFB0200800。

摘　　要：利用CAS-ESM 1.0模式模拟得到的1922~2005年共84年的7月份资料,对流场异常作了复EOF分解,并与该模式模拟的1月份结果以及相应的实况(SODA资料)和理论结果作了对比和分析。结果表明:在表层、近表层、次表层及上层底,该EOF分解的第一、二模态空间场中明显流场异常都分布在10°S~10°N,为赤道所俘获。总体上流场异常以纯纬向流动为主;它们均与赤道流系异常及赤道波动有较好对应。从表层到上层底流场异常随海洋深度明显减弱。第一、二模态都具有3~5年的年际变化周期,并以4年的年际变化最明显,并都落在ENSO的变化范围中。这两个模态都无明显年代际变化。次表层第一模态的海温异常为,西太平洋暖池区以及西、中太平洋赤道附近有负异常,在东太平洋赤道区及南美洲沿岸有正异常,两者随时间呈跷跷板变化;第二模态海温异常为,中西太平洋以负异常为主,中东太平洋则以正异常为主,并也呈跷跷板变化,且该变化包括了第一模态的跷跷板变化。本文第一、二模态的性质分别是ENSO的主、次模态。本文时间系数无明显年代际变化是因模式未能很好反映印尼穿越流所致;模式模拟的赤道两侧的明显流场异常宽度要较实况宽一倍;以上这些都表明模式在近赤道处的分辨率还不够高,须进一步提高;此外该模式的物理过程和海气耦合程序也需继续改进和优化。Using simulated data from 1922 to 2005 for the month of July obtained from the CAS-ESM 1.0 model,we performed a complex empirical orthogonal function analysis of flow-field anomalies.The results were compared with the corresponding simulated data for January,actual observations(SODA data),and theoretical results.The main conclusions were as follows:In the surface,near-surface,subsurface,and upper bottom layers significant flow-field anomalies were distributed between 10°S and 10°N in the first and second modes,centered around the equator.Overall,the flow-field anomalies were mainly characterized by pure latitudinal flows.They all corresponded well with the anomalies of equatorial flow systems and fluctuations.The flow-field anomalies from the surface to upper bottom layers significantly weakened with increasing ocean depth.Both the first and second modes showed 3–5-year interannual variation,with the most obvious changes observed over a four-year period,and all variations fell within the range of ENSO.There was no significant interdecadal variation in either mode.The SSTA of the first mode in the subsurface layer was characterized by negative anomalies in the western Pacific warm pool and near the equator in the western and central Pacific,as well as positive anomalies in the equatorial region of the eastern Pacific and along the coast of South America.Further,both anomalies exhibited a seesaw pattern over time.The SSTA of the second mode showed negative anomalies dominating the central and western Pacific,while positive anomalies prevailed in the central and eastern Pacific,which also showed a seesaw pattern.This change encompassed the seesaw pattern observed in the first mode.The characteristics of the first and second modes described in this paper correspond to the primary and secondary modes of ENSO,respectively.The absence of significant interdecadal variation in the time coefficient is attributed to the model’s inability to accurately represent the Indonesian Throughflow.The width of the pronounced fl

关 键 词：地球系统模式CAS-ESM 1.0 热带太平洋 7月份流场异常 复EOF分解 模拟评估 

分 类 号：P732[天文地球—海洋科学]