Seasonal and Interannual Variations of Irminger Ring Formation and Boundary-Interior Heat Exchange in FLAME
Seasonal and Interannual Variations of Irminger Ring Formation and Boundary-Interior Heat Exchange in FLAME
复制标题
火焰中伊明格环形成和边界-内部热交换的季节和年际变化
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
H. Furey
中科院分区：
文献类型：
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作者：
M. D. Jong;A. Bower;H. Furey
摘要利用1/12°大西洋模式实验（FLAME）模式研究了西格陵兰岛伊明格流释放的暖核反气旋（伊明格环）对拉布拉多海上层再冰化的贡献。覆盖1990-2004年期间的模式输出与伊明格洋流的观测结果以及2007 - 2009年在涡流形成区近海系泊处的环观测结果非常相似。模型中的通量分析表明，虽然与内部的大部分热交换确实发生在伊明格电流不稳定的位置，但相干伊明格环的贡献不大（18%）。热量主要通过非相干异常和环增强的局部混合提供给对流区域，从而促进边界和内部之间的进一步交换。模型中涡旋动能的时变和内部热通量边界的时变具有较强的拟合性。
AbstractThe contribution of warm-core anticyclones shed by the Irminger Current off West Greenland, known as Irminger rings, to the restratification of the upper layers of the Labrador Sea is investigated in the 1/12° Family of Linked Atlantic Models Experiment (FLAME) model. The model output, covering the 1990–2004 period, shows strong similarities to observations of the Irminger Current as well as ring observations at a mooring located offshore of the eddy formation region in 2007–09. An analysis of fluxes in the model shows that while the majority of heat exchange with the interior indeed occurs at the site of the Irminger Current instability, the contribution of the coherent Irminger rings is modest (18%). Heat is provided to the convective region mainly through noncoherent anomalies and enhanced local mixing by the rings facilitating further exchange between the boundary and interior. The time variability of the eddy kinetic energy and the boundary to interior heat flux in the model are strongly corr...