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首页> 外文期刊>Journal of Physical Oceanography >Upper-Ocean Response to the Super Tropical Cyclone Phailin (2013) over the Freshwater Region of the Bay of Bengal
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Upper-Ocean Response to the Super Tropical Cyclone Phailin (2013) over the Freshwater Region of the Bay of Bengal

机译：孟加拉湾淡水区域对超级热带气旋Phailin（2013）的大洋响应

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摘要

This study investigates the impact of salinity stratification on the upper-ocean response to a category 5 tropical cyclone, Phailin, that crossed the northern Bay of Bengal (BOB) from 8 to 13 October 2013. A drastic increase of up to 5.0 psu in sea surface salinity (SSS) was observed after Phailin's passage, whereas a weak drop of below 0.5 degrees C was observed in sea surface temperature (SST). Rightward biases were apparent in surface current and SSS but not evident in SST. Phailin-induced SST variations can be divided into the warming and cooling stages, corresponding to the existence of the thick barrier layer (BL) and temperature inversion before and erosion after Phailin's passage, respectively. During the warming stage, SST increased due to strong entrainment of warmer water from the BL, which overcame the cooling induced by surface heat fluxes and horizontal advection. During the cooling stage, the entrainment and upwelling dominated the SST decrease. The preexistence of the BL, which reduced entrainment cooling by similar to 1.09 degrees C day(-1), significantly weakened the overall Phailin-induced SST cooling. The Hybrid Coordinate Ocean Model (HYCOM) experiments confirm the crucial roles of entrainment and upwelling in the Phailin-induced dramatic SSS increase and weak SST decrease. Analyses of upper-ocean stratification associated with 16 super TCs that occurred in the BOB during 1980-2015 show that intensifications of 13 TCs were associated with a thick isothermal layer, and 5 out of the 13 were associated with a thick BL. The calculation of TC intensity with and without considering subsurface temperature demonstrates the importance of large upper-ocean heat storage in TC growth.
机译：这项研究调查了盐分分层对2013年10月8日至13日越过孟加拉湾北部（BOB）的5类热带气旋Phailin的上层海洋响应的影响。海洋中的最大上升幅度为5.0 psu菲林通过后观察到表面盐度（SSS），而海面温度（SST）则观察到低于0.5摄氏度的微弱下降。表面电流和SSS中有明显的右偏，但SST中没有明显的偏见。 Phailin引起的SST变化可以分为加热和冷却阶段，分别对应于Phailin通过之前的厚阻挡层（BL）的存在和温度反演以及之后的侵蚀。在变暖阶段，由于来自BL的较暖水强烈夹带，SST增加了，这克服了表面热通量和水平对流引起的冷却。在降温阶段，夹带和上升流主导了SST的下降。 BL的存在将夹带冷却降低了约1.09摄氏度（-1），从而大大削弱了Phailin诱导的整体SST冷却。混合坐标海洋模型（HYCOM）实验证实了夹带和上升流在Phailin引起的SSS急剧增加和SST弱减小中的关键作用。对1980-2015年BOB中发生的与16个超级TC相关的上层海洋分层的分析表明，13个TC的强化与厚等温层有关，13个TC中的5个与厚BL有关。在不考虑地下温度的情况下进行的热带气旋强度的计算表明，大型海洋蓄热对热带气旋生长的重要性。

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  • 来源
    《Journal of Physical Oceanography》 |2019年第5期|1201-1228|共28页
  • 作者

    Qiu Yun; Han Weiqing; Lin Xinyu; West B. Jason; Li Yuanlong; Xing Wen; Zhang Xiaolin; Arulananthan K.; Guo Xiaogang;

  • 作者单位

    Minist Nat Resources, Inst Oceanog 3, Xiamen, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao, Shandong, Peoples R China|Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA;

    Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA;

    Minist Nat Resources, Inst Oceanog 3, Xiamen, Peoples R China;

    Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA;

    Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA;

    Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA;

    Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA;

    Natl Aquat Resources Res & Dev Agcy, Colombo, Sri Lanka;

    Minist Nat Resources, Inst Oceanog 3, Xiamen, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Ocean; Indian Ocean; Ocean dynamics; Atmosphere-ocean interaction; Tropical cyclones;

    机译：海洋;印度洋;海洋动力学;大气-海洋相互作用;热带气旋;

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