气候变化领域集成服务门户(CCPortal): Decadal variability of the Kuroshio Extension: the response of the jet to increased atmospheric resolution in a coupled ocean

CCPortal

DOI	10.1007/s00382-020-05528-4
	Decadal variability of the Kuroshio Extension: the response of the jet to increased atmospheric resolution in a coupled ocean–atmosphere model
	Fedele G.; Bellucci A.; Masina S.; Pierini S.
发表日期	2021
ISSN	0930-7575
卷号	56 期号:2021-03-04
英文摘要	The Kuroshio Extension (KE) shifts between elongated and convoluted states on interannual to decadal time scales. The nature of this low frequency variability (LFV) is still under debate since it is known to be driven by intrinsic oceanic mechanisms, but it is also synchronized with the Pacific Decadal Oscillation (PDO). In this analysis we present the results from two present-climate coupled simulations performed with the CMCC-CM2 model under the CMIP6 HighResMIP protocol and differing only by their atmospheric component resolution. The impact of increased atmospheric resolution on the KE LFV is assessed inspecting several aspects: the KE bimodality, the large-scale variability and the air–sea interactions. The KE LFV and the teleconnection mechanism that connects the KE and the PDO are well captured by both configurations. However, higher atmospheric resolution favors the occurrence of the elongated state and leads to a more realistic PDO representation. Moreover, both simulations qualitatively capture the signatures of atmosphere-driven and ocean-driven regimes over the North Pacific Ocean, even if the higher resolution induces an excessively strong ocean–atmosphere coupling that leads to an overestimation of the air–sea feedbacks. This work highlights that the small scale atmospheric variability (resolution lower than 1°) does not substantially contribute to improve the realism of the KE LFV, but causes significant differences in the air–sea interaction over the KE region likely related to the strengthening of the coupling. The eddy-permitting ocean resolution shared by both configurations is likely responsible for the degree of realism exhibited by the simulated KE LFV in the two analyzed simulations. © 2020, The Author(s).
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183398
作者单位	Department of Environmental Science, Informatics and Statistics, Cà Foscari University, Venice, Italy; Ocean Modeling and Data Assimilation Division, Centro Euro-Mediterraneo sui Cambiamenti Climatici, Bologna, Italy; Climate Simulations and Predictions, Centro Euro-Mediterraneo sui Cambiamenti Climatici, Bologna, Italy; Parthenope University of Naples, Naples, Italy; CoNISMa, Rome, Italy
推荐引用方式 GB/T 7714	Fedele G.,Bellucci A.,Masina S.,等. Decadal variability of the Kuroshio Extension: the response of the jet to increased atmospheric resolution in a coupled ocean–atmosphere model[J],2021,56(2021-03-04).
APA	Fedele G.,Bellucci A.,Masina S.,&Pierini S..(2021).Decadal variability of the Kuroshio Extension: the response of the jet to increased atmospheric resolution in a coupled ocean–atmosphere model.Climate Dynamics,56(2021-03-04).
MLA	Fedele G.,et al."Decadal variability of the Kuroshio Extension: the response of the jet to increased atmospheric resolution in a coupled ocean–atmosphere model".Climate Dynamics 56.2021-03-04(2021).