北太平洋副极地海洋锋四季变异特征及其与中纬度大气的联系

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原文链接

国家科技期刊平台
NETL
NSTL
万方数据

中文摘要：基于高分辨率海洋与大气再分析资料,结合统计分析与动力学诊断,揭示了北太平洋副极地海洋锋区(Subarctic Oceanic Frontal Zone,SAFZ)强度四季变异的特征及成因,阐释了与SAFZ四季异常相伴随的中纬度大气环流异常特征及其对应的动力学过程.结果表明,SAFZ在秋、冬、春季较强,夏季相对较弱.海温经向平流过程是秋、冬、春季SAFZ强度维持的主导因素,而海-气界面净热通量交换过程对夏季SAFZ强度减弱起决定作用.在不同季节,伴随SAFZ强度变异,边界层湍流热通量发生变化,非绝热加热异常引起锋区上方低层气温经向梯度与大气斜压性的异常,进而导致大气瞬变涡旋活动异常.由瞬变涡旋涡度强迫异常主导,中纬度北太平洋及中国东部、东北部等地上空对应产生相当正压结构的大气位势高度场异常与风场异常,相应的大气环流异常场存在季节差异.

外文标题：Seasonal variation characteristics of the subarctic front in North Pacific and its relationship with the mid-latitude atmosphere

外文摘要：Statistical analysis and dynamical diagnosis of high-resolution oceanic and atmospheric reanalysis data are conducted to reveal the characteristics and causes of seasonal intensity variation of the Subarctic Oceanic Frontal Zone(SAFZ)in the North Pacific,and elucidate the characteristics of mid-latitude atmospheric circulation anomalies associated with the SAFZ seasonal variation and corresponding dynamic processes.The results indicate that the SAFZ is strong in autumn,winter and spring,and relatively weak in summer.The meridional advection process of Sea Surface Temperature(SST)is the dominant factor that maintains SAFZ's intensity in autumn,winter and spring,while the net heat flux exchange process at the sea-air interface plays a decisive role in the weakening of SAFZ's intensity in summer.Accompanied with the SAFZ's intensity variability in different seasons,the boundary layer turbulent heat flux anomalies develop,and the diabatic heating anomalies lead to anomalies of low-level atmospheric meridional temperature gradient and atmospheric baroclinicity above the SAFZ,and then lead to the anomalies of atmospheric transient eddy activities.Due to the dominant influence of anomalous atmospheric transient eddy vorticity forcing,equivalent barotropic structure anomalies of atmospheric geopotential height field and wind field occur over the regions of mid-latitude North Pacific and eastern and northeastern China,and the corresponding anomalous field of atmospheric circulation exhibiting seasonal differences.

外文关键词：

Subarctic oceanic frontal zoneSea temperature anomalySeasonal variationsAtmospheric transient eddy forcingMid-latitude atmospheric circulation

作者：

张然、陈圣劼、黄晶

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作者单位：

南京气象科技创新研究院,中国气象局交通气象重点开放实验室,南京,210041

江苏省气象台,南京,210041

中国科学院南海海洋研究所热带海洋环境国家重点实验室,广州,510301

关键词：

副极地海洋锋区海温异常四季变异大气瞬变涡旋强迫中纬度大气环流

基金：

江苏省自然科学青年基金中国气象科学研究院基本科研业务费专项资金江苏省青年科技人才托举工程中国科学院南海海洋研究所自主部署项目

项目编号：

BK202311102022Y026TJ-2022-053SCSI02023QY01

出版年：

2024

DOI：

10.11676/qxxb2024.20230119

气象学报

中国气象学会

气象学报

CSTPCD北大核心

影响因子：1.565

ISSN：0577-6619

年,卷(期)：2024.82(4)