Satellite-based midlatitude cyclone statistics over the Southern Ocean: 2. Tracks and surface fluxes
Satellite-based midlatitude cyclone statistics over the Southern Ocean: 2. Tracks and surface fluxes
复制标题
基于卫星的南大洋中纬度气旋统计：2. 轨迹和表面通量
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Cuihua Li
中科院分区：
文献类型：
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作者：
X. Yuan;J. Patoux;Cuihua Li
[1]在南大洋的中纬度气旋路径构建了1999-2006年期间使用两个表面数据集：欧洲中期天气预报中心（ECMWF）海平面压力分析一方面，另一方面修改后的分析，其中高波数压力变化来自散射计条带已注入小波为基础的方法。对轨道统计数据的比较揭示了两个数据集之间的差异。计算了与这些中纬度气旋有关的动量通量和感热、潜热通量，并按寿命进行了排序。这些气旋通量统计的三个方面进行了研究。(1)进入海洋的动量通量在气旋内部比在南大洋的其他部分更强，而海洋在气旋外部损失更多的显热和潜热。(2)从散射计修正的分析中计算的海洋动量通量和海洋感热和潜热的损失比从原始ECMWF分析中计算的要大。(3)中尺度气旋（短寿命气旋）对大气和南大洋之间的通量有很大贡献，尽管与长寿命气旋的地理区域略有不同。
[1] Midlatitude cyclone tracks over the Southern Ocean are constructed for the 1999–2006 period using two surface data sets: European Centre for Medium-range Weather Forecasts (ECMWF) sea-level pressure analyses on one hand, and on the other hand modified analyses in which high-wavenumber pressure variability derived from scatterometer swaths has been injected with a wavelet-based method. A comparison of track statistics reveals the differences between the two data sets. The fluxes of momentum and sensible and latent heat associated with these midlatitude cyclones are calculated and sorted by life span. Three aspects of these cyclone flux statistics are investigated. (1) The momentum flux into the ocean is stronger inside cyclones than over the rest of the Southern Ocean, while the ocean loses more sensible and latent heat outside of the cyclones. (2) The momentum flux into the ocean and the loss of sensible and latent heat by the ocean are larger when calculated from the scatterometer-modified analyses than when calculated from the original ECMWF analyses. (3) Mesoscale cyclones (short-lived cyclones) contribute a significant amount of the fluxes between the atmosphere and the Southern Ocean, although over slightly different geographic areas from longer-lived cyclones.