孙圣杰,李栋梁. 2018. 气候变暖背景下西太平洋副高体形态变异及热力原因[J]. 气象学报, (0):-, doi:10.11676/qxxb2018.039
气候变暖背景下西太平洋副高体形态变异及热力原因
Space morphological variation of the West Pacific Subtropical High and its possible thermodynamic causes under the background of climate warming
投稿时间:2017-11-10  修订日期:2018-03-16
DOI:10.11676/qxxb2018.039
中文关键词:  西太平洋副热带高压体,气候变暖,大气热源,涡度
英文关键词:The West Pacific  Subtropical High(WPSH), Climate warming, Atmospheric heat source, Vorticity
基金项目:国家重点基础研究发展计划
作者单位E-mail
孙圣杰 山东省气象局科技与预报处 sunshengjie2013@163.com 
李栋梁 南京信息工程大学大气科学学院/气象灾害预报预警与评估协同创新中心 lidl@nuist.edu.cn 
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中文摘要:
      采用美国NCEP /NCAR 再分析资料,利用相关、合成分析、大气热源的计算等方法,研究了气候变暖背景下西太平洋副热带高压空间形态的变异及热力原因。结果表明,气候变暖前后各层副高形态特征变化有很大的差异,副高体的空间形态从850~700hPa开始发生显著西伸南扩,到500hPa最为明显。各层副高在冷、暖期的形态差异与其周围大气热源和涡度的变化相对应。随着气候变暖,副高西侧和南侧的大气热源在850~700hPa上开始有明显的加强,500hPa热源加强最明显,且副高体南侧热源中心有所南移;同时,其西侧和南侧从对流层低层到中高层有反气旋涡度的增大,西侧的反气旋涡度在850-700hPa增大最明显,南侧的反气旋涡度在500hPa增大最明显,且反气旋中心整体南移。结论为气候变暖后,副高体西侧和南侧大气热源的加强,导致相应区域反气旋涡度增大,副高体向反气旋涡度增大的方向发展,从而使副高西脊点西伸,南边界南扩,整体南移。
英文摘要:
      Based on the NCEP / NCAR reanalysis data, the variation of spatial pattern of the West Pacific Subtropical High(WPSH) and the thermodynamical mechanisms leading to that variation, under the background of global warming, are investigated through correlation &composite analysisand calculating the atmospheric heat source. It shows that the pattern of WPSH on all levels varies significantly since the global warming begins. The scope of WPSH is found to expand westward and southward above 850~700 hPa, particularly at 500 hPa. The patterns of WPSH are consistent with the distributions of sourrouding heat sources and voticitity both in the cold and warm epoches. Along with the global warming, the heat sources above 850~700hPa strengthen, parcicularly at 500 hPa, at the western and southern sides of WPSH, while the heat sources at the southern side move southward .Meanwhile, the anticyclonic vorticity tends to increase at the western and southern sides of WPSH through the troposphere; in detail, the most obvious increasing tendency concentrates from 850 through 700 hPa at the western side andon 500 hPa at the southern side, while the heat sources as a whole move southward. To conclude, the anticyclonic vorticity increases as the heat sources strengthen, along with the global warming, at the west and south sides of WPSH; consequently, the WPSH expand westward & southward and move southward as a whole considering it tends to expand following the increasing anticyclonic vorticity.
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