违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 北大西洋风暴轴高低空分布及其能量诊断-Patterns of North Atlantic Strom Track in the Upper and Lower Troposphere and Their Eddy Kinetic Energy Analysis
doi:  10.3878/j.issn.1006-9585.2016.16098
北大西洋风暴轴高低空分布及其能量诊断

Patterns of North Atlantic Strom Track in the Upper and Lower Troposphere and Their Eddy Kinetic Energy Analysis
摘要点击 93  全文点击 102  投稿时间:2016-05-06  
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基金:  国家自然科学基金创新研究群体项目41521005,中国科学院国家外国专家局创新团队国际合作伙伴计划项目
中文关键词:  风暴轴  涡动动能  能量转换
英文关键词:  Storm track  Eddy kinetic energy  Energy conversion
              
作者中文名作者英文名单位
余霄YU Xiao中国海洋大学海洋与大气学院, 山东青岛 266100
黄菲HUANG Fei中国海洋大学物理海洋实验室, 山东省高校海洋-大气相互作用与气候重点实验室 山东青岛 266100
王鑫WANG Xin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 510000
管承扬GUAN Chengyang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 510000
张荣望ZHANG Rongwang中国海洋大学海洋与大气学院, 山东青岛 266100
引用:余霄,黄菲,王鑫,管承扬,张荣望.2017.北大西洋风暴轴高低空分布及其能量诊断[J].气候与环境研究,22(6):658-670,doi:10.3878/j.issn.1006-9585.2016.16098.
Citation:YU Xiao,HUANG Fei,WANG Xin,GUAN Chengyang,ZHANG Rongwang.2017.Patterns of North Atlantic Strom Track in the Upper and Lower Troposphere and Their Eddy Kinetic Energy Analysis[J].Climatic and Environmental Research(in Chinese),22(6):658-670,doi:10.3878/j.issn.1006-9585.2016.16098.
中文摘要:
      利用1979~2013年NCEP再分析数据,通过经验正交分解对比了前冬时期北大西洋风暴轴的高低空分布,并用涡动动能(Eddy Kinetic Energy,EKE)方程对风暴轴高低空分布型差异进行了诊断。研究结果表明:上层和下层第一空间分布型差异巨大,对流层下层风暴轴中心偏北,靠近极地,而上层风暴轴中心偏西南,靠近北美沿岸。EKE方程诊断结果表明:正压转换项在高低空符号相反,导致了EKE在上、下层分布出现显著差异,即上层正压转换项为负,在扰动发展中起能量耗散作用,而下层正压转换项为正,且极大值区域对应下层EKE极大值区域,为风暴轴下层向极区域增强的主要原因。而斜压转换和非地转位势通量散度在上层均为正,且远大于下层,为风暴轴上层涡动能量维持的原因,也从涡动能量收支上解释了风暴轴的主体出现在上层。
Abstract:
      This study investigates the distribution of the North Atlantic Storm Track (NAST) in the upper and lower troposphere, and associated eddy kinetic energy (EKE) distribution in each layer. EKE is then isolated in each layer. The results shows that there is a great difference in NAST and EKE between the upper and lower troposphere. In the upper troposphere, the NAST stays a bit further southwest; in the lower troposphere, the NAST shifts poleward. By examining each term in the EKE equation, it is found that the barotropic conversion is opposite in the two layers, which could be responsible for the great difference in their storm track distribution patterns. That is to say, the barotropic conversion mainly damps EKE in the upper layer whereas it strengthens EKE in the lower layer because the barotropic conversion is negative in the upper layer but positive and shows the maximum value in the center of NAST in the lower layer. Furthermore, the baroclinic conversion and the ageostrophic geopotential flux divergence both contribute to the maintenance of EKE in the upper layer.
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