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首页> 外文期刊>International journal of remote sensing >Indian Ocean near-equatorial symmetric stability from satellite observations: an elusive connection to atmospheric convection
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Indian Ocean near-equatorial symmetric stability from satellite observations: an elusive connection to atmospheric convection

机译：来自卫星观测的印度洋近赤道对称稳定性：与大气对流的一种难以捉摸的联系

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摘要

The north-south symmetry of the low level near-equatorial atmospheric flow is examined in relation to the position of the Intertropical Convergence Zone (ITCZ) over the Indian Ocean with the aid of satellite and reanalysis data. Absolute vorticity (AV) and convergence fields on temporal scales of 10 days are derived from 7 years of Quick Scatterometer (QuikSCAT) observations and related statistically to organized convection deduced from outgoing longwave radiation (OLR) measured by the National Oceanic and Atmospheric Administration (NOAA) polar-orbiting satellites. The AV observations reveal a belt of symmetric instability on the summer side of the equator. The evolution of this symmetric instability with respect to the cross-equatorial flow (CEF), the location of the ITCZ, and monsoonal forcing is investigated. We identify three distinct dominant convective regimes. We show that during the active Indian monsoon season, symmetric instability and the displacement of the zero-AV line off the equator are directly linked to organized convection and the off-equatorial location of the ITCZ. The advective (inertial) regime interacts with and is controlled by monsoon and CEF. In periods of transition between summer and winter monsoon, the lower atmosphere is symmetrically stable and two other convective regimes can be identified: a double ITCZ, and localized convection near the equator.
机译：利用卫星和再分析数据，研究了低空近赤道大气流动的南北对称性与印度洋上的热带辐合带（ITCZ）的位置有关。 10天时间尺度上的绝对涡度（AV）和会聚场是根据7年的快速散射仪（QuikSCAT）观测得出的，并且与国家海洋和大气管理局（NOAA）测量的外向长波辐射（OLR）推导出的有组织对流统计相关）极轨卫星。视听观测表明，在赤道的夏季侧出现了对称不稳定带。研究了关于横贯赤道流（CEF），ITCZ的位置和季风强迫的对称不稳定性的演变。我们确定了三种不同的优势对流方式。我们显示，在活跃的印度季风季节期间，对称不稳定和赤道零AV线偏离赤道直接与有组织的对流和ITCZ的赤道外位置有关。对流（惯性）机制与季风和CEF相互作用并受其控制。在夏季风和冬季风之间的过渡时期，低层大气是对称稳定的，可以确定另外两种对流方式：双重ITCZ和赤道附近的局部对流。

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  • 来源
    《International journal of remote sensing》 |2010年第18期|p.4665-4681|共17页
  • 作者

    GAD LEVY; JEROME PATOUX;

  • 作者单位

    NorthWest Research Associates, Seattle, Washington, USA;

    rnDepartment of Atmospheric Sciences, University of Washington,Seattle, Washington, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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