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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Wintertime Fjord-Shelf Interaction and Ice Sheet Melting in Southeast Greenland
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Wintertime Fjord-Shelf Interaction and Ice Sheet Melting in Southeast Greenland

机译：格陵兰东南部冬季峡湾 - 架子相互作用和冰薄片融化

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A realistic numerical model was constructed to simulate the oceanic conditions and circulation in a large southeast Greenland fjord (Kangerdlugssuaq) and the adjacent shelf sea region during winter 2007-2008. The major outlet glaciers in this region recently destabilized, contributing to sea level rise and ocean freshening, with increased oceanic heating a probable trigger. It is not apparent a priori whether the fjord dynamics will be influenced by rotational effects, as the fjord width is comparable to the internal Rossby radius. The modeled currents, however, describe a highly three-dimensional system, where rotational effects are of order-one importance. Along-shelf wind events drive a rapid baroclinic exchange, mediated by coastally trapped waves, which propagate from the shelf to the glacier terminus along the right-hand boundary of the fjord. The terminus was regularly exposed to around 0.5TW of heating over the winter season. Wave energy dissipation provoked vertical mixing, generating a buoyancy flux which strengthened overturning. The coastally trapped waves also acted to strengthen the cyclonic mean flow via Stokes' drift. Although the outgoing wave was less energetic and located at the opposite sidewall, the fjord did exhibit a resonant response, suggesting that fjords of this scale can also exhibit two-dimensional dynamics. Long periods of moderate wind stress greatly enhanced the cross-shelf delivery of heat toward the fjord, in comparison to stronger events over short intervals. This suggests that the timescale over which the shelf wind field varies is a key parameter in dictating wintertime heat delivery from the ocean to the ice sheet.
机译：建立了一个现实的数值模型，在2007 - 2008年冬季模拟了大东南格陵兰峡湾（Kangerdlugssuaq）和邻近的货架海区的海洋状况和循环。该地区的主要出口冰川最近是令人沮丧的，有助于海平面上升和海洋清新，随着海洋加热增加可能触发。如果峡湾动态将受到旋转效应的影响，则并不明显，因为峡湾宽度与内部罗斯比半径相当。然而，建模的电流描述了一个高度三维系统，其中旋转效应是一个重要的。沿着货架风速驱动了一种快速的曲金交换，由沿海捕获的波介导，沿着架子的右侧边界从架子传播到冰川终点。末端定期暴露在冬季的0.5TW左右。波浪能量耗散激发垂直混合，产生强化倾覆的浮力通量。沿着矛盾的波浪也采取了通过Stokes的漂移来加强旋风平均流量。虽然传出波的精力充沛，位于对面的侧壁，但峡湾确实表现出共振的反应，这表明这种规模的峡湾也可以表现出二维动力学。与短时间内的更强的事件相比，长时间的温度压力大大增强了朝向峡湾的横给送热的递送。这表明货架风场变化的时间尺度是指示从海洋到冰盖的冬季热量传递的关键参数。

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