Interannual Salinity Variability in the Tropical Pacific in CMIP5 Simulations

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	Interannual Salinity Variability in the Tropical Pacific in CMIP5 Simulations
	Hai ZHI ; Rong-Hua ZHANG; Pengfei LIN ; Peng YU
发表期刊	Advances in Atmospheric Sciences
ISSN	0256-1530
	2019-03-05
出版年	2019
卷号	v.36 期号:04 页码:42-60
文献类型	CNKI期刊论文
摘要	Salinity variability and its causes in the tropical Pacific are analyzed using observations, reanalysis products and model simulations. The mixed-layer salinity(MLS) budget analyses from observations and reanalysis products indicate that its interannual evolution is closely related to ENSO and is predominantly governed by surface forcing and surface advection in the western-central equatorial Pacific. It is found that the observed MLS tendency leads Nin?o3.4 by about 12 months due to the effect of negative freshwater flux(evaporation minus precipitation). These observation-based analyses are used to evaluate the corresponding simulation using GFDL-ESM2 M. It is evident that the model can simulate the spatiotemporal variations of MLS with some discrepancies compared to observations. In the warm pool of the equatorial Pacific the MLS tendency in the model is sensitive to ocean dynamics, however model biases cause the tendency to be underestimated. In particular, the freshwater flux is overestimated while the ocean surface zonal current and vertical velocity at the base of the mixed layer are underestimated. Due to model biases in representing the related physics, the effects of surface forcing on the simulated MLS budget are overestimated and those of subsurface and surface advection are relatively weak. Due to weaker surface advection and subsurface forcing than observed, the simulated compensations for surface forcing are suppressed, and the simulated MLS tendency that leads Nin?o3.4 by 8–10 months, which is shorter than the observed lead time. These results are useful for the interpretation of observational analyses and other model simulations in the tropical Pacific.
关键词	mixed-layer salinity salt budget interannual variability tropical Pacific model simulation
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;
CNKI专题名称	海洋学;
分类号	P714.1;P731.12
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	supported by the National Natural Science Foundation of China (Grant Nos. 41690122, 41690120 and 41475101) ; the NSFC–Shandong Joint Fund for Marine Science Research Centers (Grant No. U1406401) ; the NSFC Innovative Group Grant (Project No. 41421005) ; Taishan Scholarship
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/188630
专题	中国科学院海洋研究所
作者单位	1.CollegeofAtmosphericSciences,NanjingUniversityofInformationScienceandTechnology 2.KeyLaboratoryofOceanCirculationandWaves,InstituteofOceanology,ChineseAcademyofSciences 3.LaboratoryforOceanandClimateDynamics,QingdaoNationalLaboratoryforMarineScienceandTechnology 4.UniversityofChineseAcademyofSciences 5.StateKeyLaboratoryofNumericalModelingforAtmosphericSciencesandGeophysicalFluidDynamics(LASG),InstituteofAtmosphericPhysics(IAP),ChineseAcademyofSciences 6.TheCooperativeInstituteforClimateandSatellites(CICS),UniversityofMaryland,CollegePark
推荐引用方式 GB/T 7714	Hai ZHI,Rong-Hua ZHANG,Pengfei LIN,et al. Interannual Salinity Variability in the Tropical Pacific in CMIP5 Simulations. 2019.