Supplementary material to "On the circulation, water mass distribution, and nutrient concentrations of the western Chukchi Sea"
Supplementary material to "On the circulation, water mass distribution, and nutrient concentrations of the western Chukchi Sea"
复制标题
“关于西楚科奇海的环流、水团分布和营养物浓度”的补充材料
DOI：
10.5194/os-2021-43
复制
发表时间：
2021
期刊：
影响因子：
3.2
通讯作者：
L. Anderson
中科院分区：
文献类型：
--
作者：
Jaclyn Clement Kinney;K. Assmann;W. Maslowski;G. Björk;M. Jakobsson;S. Jutterström;Younjoo J. Lee;R. Osinski;I. Semiletov;Adam Ulfsbo;Iréne Wåhlström;L. Anderson
抽象的。大量的营养物质和碳从太平洋通过白令海峡进入北冰洋，分布在三个主要途径上。低盐度和低营养浓度的水沿着阿拉斯加海岸沿着向东流动，称为阿拉斯加海岸水。一个中央通道具有中等的盐度和营养盐浓度，而最富营养的水进入白令海峡的西侧。这些水团流向北冰洋的楚科奇海内的强大的地形转向与体积运输调制的风场。在本文中，我们使用2008年和2014年收集的穿越先驱峡谷的几个部分的数据，结合数值模拟，研究楚科奇海西部的环流和输送。我们发现，从楚科奇海进入东西伯利亚海弗兰格尔岛南部的水的相当一部分，并在岛上周围的反气旋方向循环。这些水然后有助于高营养沃茨的先驱峡谷。峡谷底部的营养物浓度最高，这可能是东西伯利亚海沉积物表面有机物降解的结果。营养盐（硝酸盐，磷酸盐和硅酸盐）和溶解无机碳在白令海夏季水和冬季水的通量计算相结合的水文和营养盐观测与地转运输参考LADCP和表面漂移数据。即使这些年份之间有一些大致的相似之处，但在温盐和营养特征方面也存在差异。为了评估这些差异，也为了获得更广泛的时间和空间视图，应用数值模拟结果。根据模型结果，高频变率在Herald峡谷的水流中占主导地位。这使我们得出结论，这一地区需要在一个较长的时间范围内进行监测，以推断时间的变化和潜在的趋势。
Abstract. Substantial amounts of nutrients and carbon enter the Arctic Ocean from the Pacific Ocean through Bering Strait, distributed over three main pathways. Water with low salinities and nutrient concentrations takes an eastern route along the Alaskan coast, as Alaskan Coastal Water. A central pathway exhibits intermediate salinity and nutrient concentrations, while the most nutrient-rich water enters Bering Strait on its western side. Towards the Arctic Ocean the flow of these water masses is subject to strong topographic steering within the Chukchi Sea with volume transports modulated by the wind field. In this contribution we use data from several sections crossing Herald Canyon collected in 2008 and 2014 together with numerical modeling to investigate the circulation and transport in the western part of the Chukchi Sea. We find that a substantial fraction of water from the Chukchi Sea enters the East Siberian Sea south of Wrangel Island and circulates in an anticyclonic direction around the island. This water then contributes to the high nutrient waters of Herald Canyon. The bottom of the canyon has the highest nutrient concentrations, likely as a result of addition from the degradation of organic matter at the sediment surface in the East Siberian Sea. The flux of nutrients (nitrate, phosphate, and silicate) and dissolved inorganic carbon in Bering Summer Water and Winter Water is computed by combining hydrographic and nutrient observations with geostrophic transports referenced to LADCP and surface drift data. Even if there are some general similarities between the years, there are differences in both the temperature-salinity and nutrient characteristics. To assess these differences, and also to get a wider temporal and spatial view, numerical modeling results are applied. According to model results, high frequency variability dominates the flow in Herald Canyon. This leads us to conclude that this region needs to be monitored over a longer time frame to deduce the temporal variability and potential trends.