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热带夏季风场与对流场季节内振荡传播模比较

林爱兰 Li Tim 李春晖

林爱兰, Li Tim, 李春晖. 热带夏季风场与对流场季节内振荡传播模比较. 应用气象学报, 2010, 21(5): 545-557..
引用本文: 林爱兰, Li Tim, 李春晖. 热带夏季风场与对流场季节内振荡传播模比较. 应用气象学报, 2010, 21(5): 545-557.
Lin Ailan, Li Tim, Li Chunhui. Comparison of propagating boreal summer intraseasonal oscillation over tropics represented by wind and convection fields. J Appl Meteor Sci, 2010, 21(5): 545-557.
Citation: Lin Ailan, Li Tim, Li Chunhui. Comparison of propagating boreal summer intraseasonal oscillation over tropics represented by wind and convection fields. J Appl Meteor Sci, 2010, 21(5): 545-557.

热带夏季风场与对流场季节内振荡传播模比较

资助项目: 

国家自然科学基金项目 41075073, 40675055

Comparison of Propagating Boreal Summer Intraseasonal Oscillation over Tropics Represented by Wind and Convection Fields

  • 摘要: 利用1979—2007年卫星观测日平均OLR资料以及NCEP/DOE第2套再分析资料中的风场资料,采用有限区域波频分析、合成分析等方法,分析对比对流层高、低层风场与对流场所表征的热带北半球夏季季节内振荡(BSISO)各种传播模态谱分布气候特征及其年际异常。结果表明:各要素反映的BSISO各种模态的气候特征及其年际变化存在一定差异,总体而言对流层低层风(850 hPa纬向风或经向风)与对流比较一致。850 hPa经向风(纬向风)所反映的纬向(经向)传播BSISO谱分布气候特征与对流情况最相似。在ENSO发展年,850 hPa经向风反映的赤道东传波加强趋势与对流较为一致;850 hPa纬向风、经向风反映的北传波变化趋势都与对流相似。在ENSO衰减年,850 hPa纬向风(经向风)反映的赤道东传波(赤道外西传波)减弱趋势与对流较为一致;对流以及850 hPa经向风、200 hPa纬向风和200 hPa经向风4种要素都能体现南海及周边地区北传波明显减弱这一特征。对流和850 hPa纬向风所反映的北传波与印度洋偶极子模态之间关系一致。
  • 图  1  夏季 (5—10月) 西传模态与东传模态纬向一波 (40°E 180°) 谱分布

    (a) OLR, (b) 850 hPa纬向风, (c) 850 hPa经向风, (d) 200 hPa纬向风, (e) 200 hPa经向风

    Fig. 1  Westward and eastward propagating BSISO spectrum during boreal summer (May—October) for zonal wavenumber-1 (40°E—180°)

    (a) OLR, (b) 850 hPa zonal wind, (c) 850 hPa meridionalwind, (d) 200 hPa zonal wind, (e) 200 hPa meridionalwind

    图  2  夏季 (5—10月) 北传模态与南传模态经向一波 (5°S 25°N) 谱分布

    (a) OLR, (b) 850 hPa纬向风, (c) 850 hPa经向风, (d) 200 hPa纬向风, (e) 200 hPa经向风

    Fig. 2  Northward and southward propagating BSISO spectrum during boreal summer (May—October) for meridional wavenumber-1 (5°S—25°N)

    (a) OLR, (b) 850 hPa zonal wind, (c) 850 hPa meridionalwind, (d) 200 hPa zonal wind, (e) 200 hPa meridionalwind

    图  3  夏季 (5—10月) 纬向一波西传波与东传波功率谱在El Niña发展年与La Niña发展年之差值 (阴影区表示通过0.05显著性检验)

    (a) OLR, (b) 850 hPa纬向风, (c) 850 hPa经向风, (d) 200 hPa纬向风, (e) 200 hPa经向风

    Fig. 3  Energy spectrum difference of the zonal wavenumber-1 westward and eastward propagating BSISO between El Niña developing summer (May—October) and La Niña developing summer (the shaded area denotes passing the test of 0.05 level)

    (a) OLR, (b) 850 hPa zonal wind, (c) 850 hPa meridional wind, (d) 200 hPa zonal wind, (e) 200 hPa meridional wind

    图  4  夏季 (5—10月) 经向一波北传波功率谱在El Niña发展年与La Niñna发展年之差值 (阴影区表示通过0.05显著性检验)

    (a) OLR, (b) 850 hPa纬向风, (c) 850 hPa经向风, (d) 200 hPa纬向风, (e) 200 hPa经向风

    Fig. 4  4 Energy spectrum difference of the meridional wavenumber-1 northward propagating BSISO between El Niña developing summer (May—October) and La Niñna developing summer (the shaded area denotes passing the test of 0.05 level)

    (a) OLR, (b) 850 hPa zonal wind, (c) 850 hPa meridional wind, (d) 200 hPa zonal wind, (e) 200 hPa meridional wind

    图  5  夏季 (5—10月) 纬向一波西传波与东传波功率谱在El Niña衰减年与La Niñna衰减年之差值 (阴影区表示通过0.05显著性检验)

    (a) OLR, (b) 850 hPa纬向风, (c) 850 hPa经向风, (d) 200 hPa纬向风, (e) 200 hPa经向风

    Fig. 5  Energy spectrum difference of the zonal wavenumber-1 westward and eastward propagating BSISO between El Niña decaying summer (May—October) and La Niñna decaying summer (the shade darea denotes passing the test of 0.05 level)

    (a) OLR, (b)850 hPa zonalwind, (c) 850 hPa meridionalwind, (d) 200 hPa zonalwind, (e) 200 hPa meridionalwind

    图  6  夏季 (5—10月) 经向一波北传波功率谱在El Niño衰减年与LaNiñna衰减年之差值 (阴影区表示通过0.05显著性检验)

    (a) OLR, (b) 850 hPa纬向风, (c) 850 hPa经向风, (d) 200 hPa纬向风, (e) 200 hPa经向风

    Fig. 6  Energy spectrum difference of the meridional wavenumber-1 northward propagating BSISO between ElNiño decaying summer (May—October) and La Niñna decaying summer (the shaded area denotespassing the test of 0.05 level)

    (a) OLR, (b)850 hPa zonalwind, (c) 850 hPa meridionalwind, (d) 200 hPa zonalwind, (e) 200 hPa meridionalwind

    图  7  夏季 (5—10月) 纬向一波东传BSISO谱正BWA年与负BWA年之差 (阴影区为通过0.05显著性检验)(a) OLR, (b) 850 hPa纬向风, (c) 850 hPa经向风, (d) 200 hPa纬向风, (e) 200 hPa经向风

    Fig. 7  Energy spectrum difference of the zonal wavenumber-1 eastward propagating BSISO between positive BWA summer (May—October) and negative BWA summer (the shaded area denotes passing the test of 0.05 level) (a) OLR, (b) 850 hPa zonal wind, (c) 850 hPa meridional wind, (d) 200 hPa zonal wind, (e) 200 hPa meridional wind

    图  8  夏季 (5—10月) 经向一波北传BSISO谱正偶极子年与负偶极子年之差 (阴影区为通过0.05显著性检验)(a) OLR, (b) 850 hPa纬向风, (c) 850 hPa经向风, (d) 200 hPa纬向风, (e) 200 hPa经向风

    Fig. 8  Energy spectrum difference of the meridional wavenumber-1 northward propagating BSISO between positive dipole summer (May—October) and negative dipole summer (the shaded area denotes passing the test of 0.05 level) (a) OLR, (b) 850 hPa zonal wind, (c) 850 hPa meridional wind, (d) 200 hPa zonal wind, (e)200 hPa meridional wind

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    返回文章
    返回