风和河流对不列颠哥伦比亚省查塔姆湾沿岸流的影响

IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Estuarine Coastal and Shelf Science Pub Date : 2024-09-26 DOI:10.1016/j.ecss.2024.108966
Li Wang , Rich Pawlowicz , Weihua Ai , Paul Covert
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引用次数: 0

摘要

查塔姆湾(Chatham Sound)是太平洋东北部一个具有重要生态和经济意义的半封闭海盆,但只得到了有限的海洋学关注。在此,我们通过分析从 2017 年安装在该处并仍在运行的高频(HF)雷达阵列获得的每小时海流场,以及其他水文测量和系泊测量数据(使我们能够在 2018 年和 2019 年期间确定几个特定地点的次表层特征)和卫星图像(处理后获得高空间分辨率的悬浮颗粒物测量数据),研究了南部海湾的表层环流。我们发现,地表环流主要由流入海湾东南角的斯基纳河羽流主导。平均而言,该羽流在海湾的东半部形成一股向北流动的沿岸流,在淡水期比较浑浊。尽管斯基纳河的水流季节性变化约为 7 倍,但羽流宽度变化不大。然而,与冬季相比,初夏新月期的羽流深度和盐度有很大不同。尽管羽流深度在海岸附近最大,但在羽流的近海边缘出现的羽流速度最快。这些特征与 1-1/2 层浮力沿岸流分析模型的预测结果一致。风可以加速或延缓沿岸流;当风力足够大时,沿岸流被阻断,浑浊的羽流水充满南部海湾。
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Wind and river effects on a coastal current in Chatham Sound, British Columbia
Chatham Sound is an ecologically and economically important semi-enclosed basin in the northeast Pacific which has received only limited oceanographic attention. Here we investigate the surface circulation in the southern Sound by analyzing hourly current fields obtained from a high-frequency (HF) radar array, installed there in 2017 and still in operation, as well as other hydrographic and mooring measurements that allow us to characterize subsurface features at several specific locations during 2018 and 2019, and satellite imagery processed to obtain a measure of suspended particulate matter at high spatial resolution. We find that the surface circulation is dominated by the plume of the Skeena River, which flows into the southeast corner of the Sound. On average, this plume forms a northward flowing coastal current in the eastern half of the Sound, and is turbid during the freshet. The plume width changes only marginally even though the Skeena’s flow changes seasonally by a factor of about 7. However, the depth of the plume and its salinity is dramatically different during the early summer freshet compared to values in winter. Fastest plume currents appear near the offshore edges of the plume, even though the plume depth is greatest near the coast. We show that these features are consistent with those predicted from an analytical 1-1/2 layer buoyant coastal current model. Winds can accelerate or retard the coastal current; when strong enough the flow is arrested and turbid plume water fills the southern Sound.
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来源期刊
CiteScore
5.60
自引率
7.10%
发文量
374
审稿时长
9 months
期刊介绍: Estuarine, Coastal and Shelf Science is an international multidisciplinary journal devoted to the analysis of saline water phenomena ranging from the outer edge of the continental shelf to the upper limits of the tidal zone. The journal provides a unique forum, unifying the multidisciplinary approaches to the study of the oceanography of estuaries, coastal zones, and continental shelf seas. It features original research papers, review papers and short communications treating such disciplines as zoology, botany, geology, sedimentology, physical oceanography.
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