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Seasonal Variation of the Indonesian Throughflow in Makassar Strait

机译：望加锡海峡印尼通流的季节变化

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摘要

The seasonal variation of Indonesian Throughflow (ITF) transport is investigated using ocean general circulation model experiments with the Hybrid Coordinate Ocean Model (HYCOM). Twenty-eight years (1981-2008) of 1/3° Indo-Paciflc basin HYCOM simulations and three years (2004-06) from a 1/12° global HYCOM simulation are analyzed. Both models are able to simulate the seasonal variation of upper-ocean currents and the total transport through Makassar Strait measured by International Nusantara Stratification and Transport (INSTANT) moorings reasonably well. The annual cycle of upper-ocean currents is then calculated from the Indo-Pacific HYCOM simulation. The reduction of southward currents at Makassar Strait during April-May and October-November is evident, consistent with the INSTANT observations. Analysis of the upper-ocean currents suggests that the reduction in ITF transport during April-May and October-November results from the wind variation in the tropical Indian Ocean through the generation of a Wyrtki jet and the propagation of coastal Kelvin waves, while the subsequent recovery during January-March originates from upper-ocean variability associated with annual Rossby waves in the Pacific that are enhanced by western Pacific winds. These processes are also found in the global HYCOM simulation during the period of the INSTANT observations. The model experiments forced with annual-mean climatological wind stress in the Pacific and 3-day mean wind stress in the Indian Ocean show the reduction of southward currents at Makassar Strait during October-November but no subsequent recovery during January-March, confirming the relative importance of wind variations in the Pacific and Indian Oceans for the ITF transport in each season.
机译：使用混合坐标海洋模型（HYCOM）的海洋总环流模型实验研究了印度尼西亚流量（ITF）的季节性变化。分析了1/3°印度洋-太平洋盆地HYCOM模拟的28年（1981-2008）和1/12°全球HYCOM模拟的3年（2004-06）。这两个模型都能够很好地模拟洋流的季节性变化以及由国际努桑塔拉分层和运输（INSTANT）系泊所测量的通过望加锡海峡的总运输量。然后从印度洋-太平洋HYCOM模拟中计算出洋流的年循环。在4月-5月和10月-11月期间，望加锡海峡的南向洋流明显减少，这与瞬时观测结果一致。对洋流的分析表明，在四月至五月和十月至十一月期间，ITF运量的减少是由于热带印度洋通过产生Wyrtki射流和沿海开尔文波的传播而引起的风变。 1月至3月的恢复是源于太平洋上与每年的Rossby波相关的上层海洋变化，而西太平洋风增强了这些变化。在INSTANT观测期间，在全球HYCOM模拟中也发现了这些过程。太平洋上的年平均气候风应力和印度洋上的3天平均风应力强迫进行的模型实验表明，十月至十一月期间望加锡海峡的南向洋流减少，但一月至三月期间没有随后的恢复，证实了相对太平洋和印度洋风向变化对每个季节ITF运输的重要性。

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  • 来源
    《Journal of Physical Oceanography》 |2012年第7期|p.1099-1123|共25页
  • 作者

    Toshiaki Shinoda; Weiqing Han; E.Joseph Metzger; Harley E. Hurlburt;

  • 作者单位

    Naval Research Laboratory, Stennis Space Center, Mississippi Naval Re search Laboratory, Stennis Space Center, MS 39529;

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

    Naval Research Laboratory, Stennis Space Center, Mississippi;

    Naval Research Laboratory, Stennis Space Center, Mississippi;

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