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On the upper tropospheric formation and occurrence of high and thin cirrus clouds during anticyclonic poleward Rossby wave breaking events

机译:反气旋极地Rossby破波过程中对流层上层的形成和高,薄卷云的发生

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摘要

Ground-based lidar measurements and balloon soundings were employed to examine the dynamical link between anticyclonic Rossby wave breaking and cirrus clouds from 13 to 15 February 2006. For this event, an air mass with low Ertel's potential vorticity appeared over Central Europe. In the tropopause region, this air mass was accompanied with both an area of extreme cold temperatures placed northeastward, and an area of high specific humidity, located southwestward. ECMWF analyses reveal a strong adiabatic northeastward and upward transport of water vapour within the warm conveyor belt on the western side of the ridge over Mecklenburg, Northern Germany. The backscatter lidar at Kuhlungsborn (54.1°N, 11.8°E) clearly identified cirrus clouds at between 9 and 11.4 km height. In the tropopause region high-vertical resolution radiosoundings showed layers of subsaturated water vapour over ice but with a relative humidity over ice >80%. Over Northern Germany radiosondes indicated anticyclonically rotating winds in agreement with backward trajectories of ECMWF analyses in the upper troposphere, which were accompanied by a relatively strong increase of the tropopause height on 14 February. Based on ECMWF data the strong link between the large-scale structure, updraft and ice water content was shown.
机译:2006年2月13日至15日,采用了地面激光雷达测量和气球探测技术来研究反气旋Rossby波浪破裂和卷云之间的动力学联系。为此,中欧地区出现了具有低Ertel潜在涡度的气团。在对流层顶地区,这种空气质量既伴有东北偏北的极寒温度区域,又位于西南偏高的比湿度区域。 ECMWF分析显示,在德国北部梅克伦堡山脊西侧的温暖输送带中,水蒸气向东北向强烈绝热输送。 Kuhlungsborn(54.1°N,11.8°E)的后向散射激光雷达清楚地识别出9到11.4 km之间的卷云。在对流层顶地区,高垂直分辨率的声音显示出冰上的亚饱和水蒸气层,但冰上的相对湿度> 80%。在德国北部,无线电探空仪表明对流旋风与对流层高层ECMWF分析的后向轨迹一致,伴随着2月14日对流层顶高度的相对强烈增加。根据ECMWF数据,显示了大型结构,上升气流和冰水含量之间的紧密联系。

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  • 来源
    《Tellus》 |2010年第3期|p.228-242|共15页
  • 作者单位

    Leibniz - Institut fuer Atmosphaerenphysik an der Universitaet Rostock, Schlossstrasse 6, D-18225 Ostseebad Kuehlungsborn, Mecklenburg, Germany;

    Leibniz - Institut fuer Atmosphaerenphysik an der Universitaet Rostock, Schlossstrasse 6, D-18225 Ostseebad Kuehlungsborn, Mecklenburg, Germany;

    Leibniz - Institut fuer Atmosphaerenphysik an der Universitaet Rostock, Schlossstrasse 6, D-18225 Ostseebad Kuehlungsborn, Mecklenburg, Germany;

    Leibniz - Institut fuer Atmosphaerenphysik an der Universitaet Rostock, Schlossstrasse 6, D-18225 Ostseebad Kuehlungsborn, Mecklenburg, Germany;

    Institut fuer Physik der Atmosphaere, DLR Oberpfaffenhofen, Germany;

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