气候变化领域集成服务门户(CCPortal): Submesoscale Impacts on Mesoscale Agulhas Dynamics

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DOI	10.1029/2019MS001724
	Submesoscale Impacts on Mesoscale Agulhas Dynamics
	Schubert R.; Schwarzkopf F.U.; Baschek B.; Biastoch A.
发表日期	2019
ISSN	19422466
起始页码	2745
结束页码	2767
卷号	11 期号:8
英文摘要	Mesoscale dynamics of the Agulhas Current system determine the exchange between the Indian and Atlantic oceans, thereby influencing the global overturning circulation. Using a series of ocean model experiments compared to observations, we show that the representation of mesoscale eddies in the Agulhas ring path improves with increasing resolution of submesoscale flows. Simulated submesoscale dynamics are validated with time-mean horizontal-wavenumber spectra from satellite sea surface temperature measurements and mesoscale dynamics with spectra from sea surface height. While the Agulhas ring path in a nonsubmesoscale-resolving (1/20)° configuration is associated with too less power spectral densities on all scales and too steep spectral slopes, the representation of the mesoscale dynamics improves when the diffusion and the dissipation of the model are reduced and some small-scale features are resolved. Realistic power spectral densities over all scales are achieved when additionally the horizontal resolution is increased to (1/60)° and a larger portion of the submesoscale spectrum is resolved. Results of an eddy detection algorithm applied to the model outputs as well as to a gridded sea surface height satellite product show that in particular strong cyclones are much better represented when submesoscale flows are resolved by the model. The validation of the submesoscale dynamics with sea surface temperature spectra provides guidance for the choice of advection schemes and explicit diffusion and dissipation as well as for further subgrid-scale parameterizations. For the Agulhas ring path, the use of upstream biased advection schemes without explicit diffusion and dissipation is found to be associated with realistically simulated submesoscales. ©2019. The Authors.
英文关键词	Agulhas; model validation; satellite observations; scale interaction; spectral analysis; submesoscale dynamics
语种	英语
scopus关键词	Advection; Atmospheric temperature; Diffusion; Dynamics; Power spectral density; Satellites; Spectral density; Spectrum analysis; Storms; Submarine geophysics; Surface properties; Surface waters; Temperature measurement; Agulhas; Horizontal resolution; Model validation; Overturning circulation; Satellite observations; Scale interactions; Sea surface temperature (SST); Small-scale features; Oceanography; cyclone; mesoscale eddy; model validation; oceanic circulation; satellite; sea surface height; sea surface temperature; spectral analysis; Agulhas Current; Atlantic Ocean; Indian Ocean; Indian Ocean
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156888
作者单位	GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Helmholtz-Centre Geesthacht, Geesthacht, Germany; Christian-Albrechts-University Kiel, Kiel, Germany
推荐引用方式 GB/T 7714	Schubert R.,Schwarzkopf F.U.,Baschek B.,et al. Submesoscale Impacts on Mesoscale Agulhas Dynamics[J],2019,11(8).
APA	Schubert R.,Schwarzkopf F.U.,Baschek B.,&Biastoch A..(2019).Submesoscale Impacts on Mesoscale Agulhas Dynamics.Journal of Advances in Modeling Earth Systems,11(8).
MLA	Schubert R.,et al."Submesoscale Impacts on Mesoscale Agulhas Dynamics".Journal of Advances in Modeling Earth Systems 11.8(2019).