Aretxabaleta Alfredo L, McGilliguddy Dennis, Smith Keston W, Lynch Daniel R
Woods Hole Oceanographic Institution, MA, USA.
Dartmouth College, NH, USA.
J Geophys Res. 2008 Oct;113(C10). doi: 10.1029/2007JC004480. Epub 2008 Oct 29.
The characteristics of a persistent gyre in the mouth of the Bay of Fundy are studied using model simulations. A set of climatological runs are conducted to evaluate the relative importance of the different forcing mechanisms affecting the gyre. The main mechanisms are tidal rectification, and density-driven circulation. Stronger circulation of the gyre occurs during the later part of the stratified season (July-August and September-October). The density-driven flow around the gyre is set-up by weak tidal mixing in the deep basin in the central Bay of Fundy and strong tidal mixing on the shallow flanks around Grand Manan Island and western Nova Scotia. Retention of particles in the Gyre is controlled by the residual tidal circulation, increased frontal retention during stratified periods, wind stress, and interactions with the adjacent circulation of the Gulf of Maine. Residence times longer than 30 days are predicted for particles released in the proximity of the gyre.
利用模型模拟研究了芬迪湾口持续存在的环流特征。进行了一组气候学模拟，以评估影响该环流的不同强迫机制的相对重要性。主要机制是潮汐整流和密度驱动环流。在分层季节的后期（7 - 8月和9 - 10月），环流更强。环流周围的密度驱动流是由芬迪湾中部深盆中的弱潮汐混合以及大马南岛和新斯科舍省西部浅侧翼的强潮汐混合形成的。环流中颗粒的滞留受剩余潮汐环流、分层期增加的锋面滞留、风应力以及与缅因湾相邻环流相互作用的控制。预计在环流附近释放的颗粒停留时间超过30天。
