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首页> 外文期刊>Journal of Physical Oceanography >Revisiting the Wintertime Intraseasonal SST Variability in the Tropical South Indian Ocean: Impact of the Ocean Interannual Variation
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Revisiting the Wintertime Intraseasonal SST Variability in the Tropical South Indian Ocean: Impact of the Ocean Interannual Variation

机译：回顾热带南印度洋的冬季季节内SST变异性：海洋年际变化的影响

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摘要

Intraseasonal sea surface temperature (SST) variability over the Seychelles-Chagos thermocline ridge (SCTR; 12°-4°S, 55°-85°E) induced by boreal wintertime Madden-Julian oscillations (MJOs) is investigated with a series of OGCM experiments forced by the best available atmospheric data. The impact of the ocean interannual variation (OIV), for example, the thermocline depth changes in the SCTR, is assessed. The results show that surface shortwave radiation (SWR), wind speed-controlled turbulent heat fluxes, and wind stress-driven ocean processes are all important in causing the MJO-related intraseasonal SST variability. The effect of the OIV is significant in the eastern part of the SCTR (70°-85°E), where the intraseasonal SSTs are strengthened by about 20% during the 2001-11 period. In the western part (55°-70°E), such effect is relatively small and not significant. The relative importance of the three dominant forcing factors is adjusted by the OIV, with increased (decreased) contribution from wind stress (wind speed and SWR). The OIV also tends to intensify the year-to-year variability of the intraseasonal SST amplitude. In general, a stronger (weaker) SCTR favors larger (smaller) SST responses to the MJO forcing. Because of the nonlinearity of the upper-ocean thermal stratification, especially the mixed layer depth (MLD), the OIV imposes an asymmetric impact on the intraseasonal SSTs between the strong and weak SCTR conditions. In the eastern SCTR, both the heat flux forcing and entrainment are greatly amplified under the strong SCTR condition, but only slightly suppressed under the weak SCTR condition, leading to an overall strengthening effect by the OIV.
机译：使用一系列OGCM研究了冬季北方寒带Madden-Julian振荡（MJOs）引起的塞舌尔-查戈斯热跃脊（SCTR; 12°-4°S，55°-85°E）的季节内海表温度（SST）变异性最好的可用大气数据进行的实验。评估了海洋年际变化（OIV）的影响，例如SCTR中的跃层深度变化。结果表明，表面短波辐射（SWR），风速控制的湍流热通量以及风应力驱动的海洋过程在引起MJO相关的季节内SST变异性方面都非常重要。 OIV的影响在SCTR的东部（70°-85°E）很显着，在2001-11年期间，季节内的海温增强了约20％。在西部地区（55°-70°E），这种影响相对较小，并不明显。 OIV调整了三个主要强迫因素的相对重要性，同时增加了风应力（风速和SWR）的贡献（减小了）。 OIV还倾向于加剧季节内SST振幅的逐年变化。通常，较强（较弱）的SCTR支持对MJO强制进行较大（较小）的SST响应。由于上层海洋热分层的非线性，特别是混合层深度（MLD），OIV在强和弱SCTR条件之间对季节内SST施加非对称影响。在东部SCTR，在强SCTR条件下，热通量的强迫和夹带都被大大放大，而在弱SCTR条件下，热通量的强迫和夹带都被轻微地抑制，从而导致OIV的整体强化作用。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第7期|1886-1907|共22页
  • 作者

    Yuanlong Li; Weiqing Han; Toshiaki Shingoda; Chunzai Wang; M.Ravichandran; Jih-Wang Wang;

  • 作者单位

    Department of Atmospheric and Oceanic Sciences,University of Colorado, Boulder, Campus Box 311, Boulder, CO 80309;

    Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, Boulder, Colorado;

    Department of Physical and Environmental Sciences, Texas A&M University, Corpus Christi, Texas;

    NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida;

    Indian National Centre for Ocean Information Services, Hyderabad, Andhra Pradesh, India;

    Cooperative Institute for Research in Environmental Sciences, Boulder, Colorado;

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