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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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A NUMERICAL STUDY ON THE MEDIUM-RANGE responseS OF THE ATMOSPHERE TO THE ABNORMAL SOIL MOISTURE

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Acta meteorologica Sinica 1992年第3期6卷 299-310页

作者：燕启民郑庆林 Chinese Academy of Meteorological Sciences Beijing 100081

By employing the improved T42L9 spectral model introduced by NMC (Beijing) from ECMWF and utilizing the FGGE-IIIb data covering the period of 14—19 June 1979, the atmospheric responses to the abnormal soil moisture during the medium-range period have been studied numerically. According to the initial field at 12 GMT 14 June, a five-day numerical experiment under different conditions of the soil moisture has been carried out respectively. The monthly mean climatological soil moisture for June has been used in the control experiment in the initial time and it changes with time according to the moisture budget equation at the land surface. Comparing with the experiments with dry or wet soil. one can conclude that: 1) Source of precipitation over continents in summer consists of the land-surface evaporation and the moisture transfer from oceans. Their intensities are comparable during the medium-range time scale when the soil evaporates its moisture sufficiently. Therefore, the soil moisture can influence the global precipitation and the general circulation significantly; 2) By influencing the thermodynamic difference between land and sea,the soil moisture can change the intensity of monsoon and precipitation distribution; 3) The response of the atmosphere to the abnormal soil moisture has the characteristics of geographical distribution and nonlinear interactions; 4) Human activi- ties on the world can influence the environment greatly.

关键词： soil moisture surface evaporation atmospheric response precipitation monsoon

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