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Impacts of oceanic fronts and Eddies in the Kuroshio-Oyashio Extension Region on the Atmospheric General Circulation and Storm Track

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Advances in Atmospheric Sciences 2022年第1期39卷 22-54页

作者： Guidi ZHOU Xuhua CHENG Key Laboratory of Marine Hazards Forecasting Ministry of Natural Resources(MNR)Hohai UniversityNanjing 210098China College of Oceanography Hohai UniversityNanjing 210098China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China

This paper reviews the progress in our understanding of the atmospheric response to midlatitude oceanic fronts and eddies,emphasizing the Kuroshio-Oyashio Extension(KOE)*** perturbations of interest consist of sharp oceanic fronts,temperature anomalies associated with mesoscale eddies,and to some extent even higher-frequency submesoscale *** focus is on the free atmosphere above the boundary *** the midlatitude atmosphere is dominated by vigorous transient eddy activity in the storm track,the response of both the time-mean flow and the storm track is *** storm track response arguably overwhelms the mean-flow response and makes the latter hard to detect from *** frontal impacts on the mesoscale structures of individual synoptic storms are discussed,followed by the role of oceanic fronts in maintaining the storm track as a *** fronts exhibit significant decadal variability and can therefore presumably modulate the storm *** studies are summarized and *** understanding has advanced greatly but is still subject to large uncertainties arising from inadequate data resolution and other *** modeling studies highlighted the importance of mesoscale eddies and probably even submesoscale processes in maintaining the storm track but confirmation and validation are still ***,the atmospheric response can potentially provide a feedback mechanism for the North Pacific *** reviewing the above aspects,we envision that future research shall focus more upon the interaction between smaller-scale oceanic processes(fronts,eddies,submesoscale features)and atmospheric processes(fronts,extratropical cyclones etc.),in an integrated way,within the context of different climate background states.

关键词： atmospheric response storm track oceanic front mesoscale eddy submesoscale Kuroshio-Oyashio Extension

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Impact of Kuroshio Extension dipole mode variability on the North Pacific storm track

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Atmospheric and oceanic Science Letters 2017年第5期10卷 389-396页

作者： ZHANG Jie LUO De-Hai Key Laboratory of Regional Climate–Environment for East Asia Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences

An index of a large-scale Kuroshio Extension（KE） sea surface height dipole（KED） mode is constructed using satellite altimeter sea level anomaly observations from January 1993 to December 2015 based on previous work of the second author. It is found that the KED mode that undergoes a decadal variation from a negative phase（a positive-over-negative dipole, KED.） to a positive phase（a negative-over-positive dipole, KED＋） can affect the variability of the oceanic SST front and the North Pacific storm track. The results show that the oceanic SST fronts in the north of the KE region and in the KE region — referred to as the NSST and KSST fronts, respectively — are closely correlated with the KED mode. In the NSST front region, the SST front is stronger for KED. than for KED＋, and the opposite is the case in the KSST region. It is further revealed that the decadal phase transition of the KED mode can change the location and strength of the North Pacific storm track, with the North Pacific storm track being slightly weaker and moving more northwards as a whole during the KED. mode than during the KED＋ mode. The westerly wind associated with the storm track on the downstream side of the KE region intensifies and shifts northwards under KED. compared to KED＋.Furthermore, the transition of the KED mode gives rise to changes in the North Pacific storm track by changing the NSST and KSST fronts and meridional heat flux.

关键词： Kuroshio Extension oceanic front North Pacific storm track

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Ocean mesoscale structure–induced air–sea interaction in a high-resolution coupled model

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Atmospheric and oceanic Science Letters 2019年第2期12卷 98-106页

作者： LIN Pengfei LIU Hailong MA Jing LI Yiwen State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology

Using the Community Earth System Model framework, the authors build a very-high-resolution quasi-global coupled model by coupling an eddy-resolving quasi-global ocean model with a high-resolution atmospheric model. The model is successfully run for six years under present climate conditions, and the simulations are evaluated against observational and reanalysis *** model is capable of simulating large-scale oceanic and atmospheric circulation patterns, sea surface temperature(SST) fronts, oceanic eddy kinetic energy, and fine-scale structures of surface winds. The ocean mesoscale structure–induced air–sea interaction characteristics are explored in detail. The model can effectively reproduce positive correlations between SST and surface wind stress induced by mesoscale structures through comparison with observations. The positive correlation is particularly significant over regions with strong oceanic fronts and ***, the responses of wind stress to eddy-induced SST are weaker in the simulation than in the observations, although different magnitudes exist in different areas. Associated with weak wind responses, surface sensible heat flux responses to eddy-induced SST are underestimated slightly, while surface latent heat flux responses are overestimated because of the drier atmospheric boundary layers in the model. Both momentum mixing and pressure adjustment mechanisms play important roles in surface wind changes over oceanic fronts and eddies in the high-resolution model.

关键词： Air–sea interaction oceanic front eddy high-resolution simulation

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A decadal abruption of midwinter storm tracks over North Pacific from 1951 to 2010

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Atmospheric and oceanic Science Letters 2016年第4期9卷 235-245页

作者： YANG Dong-Xia Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences

Based on 60-year （1951-2010） reanalysis data of the National oceanic and Atmospheric Administration and extended reconstructed sea surface temperatures, a detailed investigation was conducted to explore the midwinter storm track changes over the North Pacific. The root- mean-square （rms） of subweekly （2.5-6 days） transient of 300 hPa geopotential height field was calculated to represent the storm track. A decadal abruption occurred in 1982/1983, according to the Mann-Kendall test result. The first two Empirical Orthogonal Function （EOF） spatial patterns of the North Pacific storm track during P1 （1955-1982） and P2 （1983-2010） revealed opposite results：The EOF1 during P1 and the EOF2 during P2 revealed changes of intensity of the midwinter storm track in the North Pacific, whereas the EOF2 during P1 and the EOF1 during P2 exhibited a southward/northward shift of its central axis. In addition, pronounced differences in the thermal influence of the ocean on the storm track during P1 and P2 existed. A strong and sustained ENSO signal contributed to a storm track variation through the westerly jet from1955 to 1982, as the storm track was observed to strengthen and shift equatorward during El Ni6o events. From 1983 to 2010, an apparent sea temperature frontal zone at approximately 40°N and the associated near-surface baroclinicity resulted in the organization of a prominent mid-latitude storm track throughout the depth of the troposphere.

关键词： Storm track midwinter EOF ENSO oceanic front baroclinicity

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Variability of the Continental Water Boundary near the Prydz Bay

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Marine Science Bulletin 2002年第1期4卷 1-10页

作者：蒲书箴董兆乾胡筱敏于非赵新 First Institute of Oceanography SOA Qingdao 266061 Polar Research Institute of China Shanghai 200129

Based on the data obtained during the 15th Antarctic Expedition of China between November 1998 and February 1999, the paper discusses the water masses distributed on both sides of the Continental Water Boundary (CWB) as well as the spacial variability of the physical characteristics of the central location, the frontal width, the frontal strength, the vertical depth, and the vertical thickness for CWB. The above results are compared with the results from the data obtained during the 9th Antarctic Expedition of China between December 1992 and February 1993, and the temporal variability of those characteristics is discussed. In addition, the inhomogeneity of the kinematic characteristics and the patterns of the dynamic heights for those water masses located on both sides of CWB are illustrated. As it is pointed out in the paper, the trough in the dynamic height field is identified with the frontal location of CWB and the oceanic current shear. Furthermore, the dynamic reason for the upwelling of the circumpolar deep water can be understood by the explanation described in the paper.

关键词： Pryze Bay oceanic front Continental Water Boundary variability

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