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Detachment of Low‐Salinity Water From the Yellow River Plume in Summer
Journal of Geophysical Research: Oceans ( IF 3.6 ) Pub Date : 2020-09-17 , DOI: 10.1029/2020jc016344
Xiaojie Yu 1, 2 , Xinyu Guo 1, 3 , Huiwang Gao 1, 2
Affiliation  

Historical hydrographic data reveal that low‐salinity water can detach from the Yellow River plume in summer. In this study, the mechanism of this detachment is examined using a three‐dimensional numerical model that reproduced the observed detachment, including the position and size of the detached low‐salinity water patch. Sensitivity experiments showed that tide‐induced residual currents and tidal mixing around the Yellow River mouth played key roles in the detachment during spring tide. During the transition from neap tide to spring tide, the intensification of the northward tide‐induced residual current and the weakening of the southward density‐driven current lead to a net northward residual current (0.03 m/s), transporting high‐salinity water to the southern area of low‐salinity water. Meanwhile, the gradually strengthened tidal mixing also increased surface salinity, which was apparent in the central area of low‐salinity water. With the combination of these two effects, the low‐salinity water was separated into two parts during spring tide; that is, detachment of low‐salinity water occurred. The above scenario works with a condition of no wind. With the prevailing southeasterly winds during summer, the northeastward wind‐induced surface current promoted detachment by moving the detached low‐salinity water northeastward and enlarging its size. In contrast, the northerly wind that prevails in the other seasons drove low‐salinity water southward, which then flowed along the coast and hindered detachment. Consequently, the detachment of low‐salinity water from the Yellow River plume occurs only in summer.

中文翻译:

夏季从黄河羽流中提取低盐度水

历史的水文资料表明,夏季低盐度水会从黄河羽流中脱离出来。在这项研究中,使用三维数值模型检查了这种脱离的机理,该模型再现了观察到的脱离,包括脱离的低盐度水斑的位置和大小。敏感性实验表明,潮汐引起的剩余水流和黄河口附近的潮汐混合在春季潮汐中起着重要作用。在从潮汐到春季潮汐的过渡过程中,北向潮汐引起的剩余电流的增强和南向密度驱动的电流的减弱导致净北向残余电流(0.03 m / s),从而将高盐度的水运到低盐度水的南部地区。与此同时,逐渐增强的潮汐混合也增加了表面盐度,这在低盐度水的中心区域很明显。结合这两种作用,在春季潮汐时将低盐度水分为两部分。也就是说,发生了低盐度水的分离。以上情况在无风的情况下适用。在夏季盛行东南风时,东北偏风引起的地表水流通过使分离的低盐度水向东北移动并扩大其大小而促进了分离。相反,在其他季节盛行的北风将低盐度的水向南驱动,然后沿海岸流动并阻碍了分离。因此,仅在夏季才发生黄河羽流中低盐度水的脱离。这在低盐度水的中心区域很明显。结合这两种作用,在春季潮汐时将低盐度水分为两部分。也就是说,发生了低盐度水的分离。以上情况在无风的情况下适用。在夏季盛行东南风时,东北偏风引起的地表水流通过使分离的低盐度水向东北移动并扩大其大小而促进了分离。相反,在其他季节盛行的北风将低盐度的水向南驱动,然后沿海岸流动并阻碍了分离。因此,仅在夏季才发生黄河羽流中低盐度水的脱离。这在低盐度水的中心区域很明显。结合这两种作用,在春季潮汐时将低盐度水分为两部分。也就是说,发生了低盐度水的分离。以上情况在无风的情况下适用。在夏季盛行东南风时,东北偏风引起的地表水流通过使分离的低盐度水向东北移动并扩大其大小而促进了分离。相反,在其他季节盛行的北风将低盐度的水向南驱动,然后沿海岸流动并阻碍了分离。因此,仅在夏季才发生黄河羽流中低盐度水的脱离。在春季潮汐时将低盐度水分为两部分;也就是说,发生了低盐度水的分离。以上情况在无风的情况下适用。在夏季盛行东南风时,东北偏风引起的地表水流通过使分离的低盐度水向东北移动并扩大其大小而促进了分离。相反,在其他季节盛行的北风将低盐度的水向南驱动,然后沿海岸流动并阻碍了分离。因此,仅在夏季才发生黄河羽流中低盐度水的脱离。在春季潮汐时将低盐度水分为两部分;也就是说,发生了低盐度水的分离。以上情况在无风的情况下适用。在夏季盛行东南风时,东北偏风引起的地表水流通过使分离的低盐度水向东北移动并扩大其大小而促进了分离。相反,在其他季节盛行的北风将低盐度的水向南驱动,然后沿海岸流动并阻碍了分离。因此,仅在夏季才发生黄河羽流中低盐度水的脱离。东北风致的地表电流通过使分离的低盐度水向东北移动并扩大其大小来促进分离。相反,在其他季节盛行的北风将低盐度的水向南驱动,然后沿海岸流动并阻碍了分离。因此,仅在夏季才发生黄河羽流中低盐度水的脱离。东北风致的地表电流通过使分离的低盐度水向东北移动并扩大其大小来促进分离。相反,在其他季节盛行的北风将低盐度的水向南驱动,然后沿海岸流动并阻碍了分离。因此,仅在夏季才发生黄河羽流中低盐度水的脱离。
更新日期:2020-09-26
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