Simulation of high concentration of iron in dense shelf water in the Okhotsk Sea
Simulation of high concentration of iron in dense shelf water in the Okhotsk Sea
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DOI：
10.1016/j.pocean.2014.04.018
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发表时间：
2014-08
影响因子：
4.1
通讯作者：
Keisuke Uchimoto;Tomohiro Nakamura;J. Nishioka;H. Mitsudera;K. Misumi;D. Tsumune;M. Wakatsuchi
中科院分区：
文献类型：
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作者：
Keisuke Uchimoto;Tomohiro Nakamura;J. Nishioka;H. Mitsudera;K. Misumi;D. Tsumune;M. Wakatsuchi
开发了海洋大气环流模型与简单的生物地球化学模型相结合，以模拟鄂霍次克海及其周围的铁循环。该模型有两个外部铁源：海面的尘埃铁和浅于 300 m 的海底的沉积铁。该模型很好地体现了稠密陆架水（DSW）中铁浓度高及其混合等特征，其混合从西北陆架沿萨哈林岛向南延伸，最终流入太平洋。铁粉在海水中溶解度的灵敏度实验表明，在我们的模拟中，1% 的溶解度是合适的。与观测结果相比，较高的溶解度（5％和10％）导致夏季北太平洋西北部的磷酸盐过低，而海面的铁浓度过高。此外，这些实验表明，铁粉对中间层中的高铁浓度几乎没有贡献。为了调查中间层中铁的来源位置，对鄂霍次克海四个区域的沉积铁输入的命运进行了研究。结果表明，北部陆架的西部和中部地区很重要。
An ocean general circulation model coupled with a simple biogeochemical model was developed to simulate iron circulation in and around the Sea of Okhotsk. The model has two external sources of iron: dust iron at the sea surface and sedimentary iron at the seabed shallower than 300 m. The model represented characteristic features reasonably well, such as high iron concentration in the dense shelf water (DSW) and its mixing, which extends southward in the intermediate layer from the northwestern shelf along Sakhalin Island and finally flows into the Pacific. Sensitivity experiments for the solubility of dust iron in seawater suggest that a solubility of 1% is appropriate in our simulation. Higher solubilities (5% and 10%) result in too low phosphate in the northwestern North Pacific in summer as well as too high iron concentrations at the sea surface, compared with observations. Besides, these experiments show that dust iron hardly contributes to the high iron concentration in the intermediate layer. To investigate locations from which the iron in the intermediate layer originates, the fate of sedimentary iron input from four regions in the Okhotsk Sea was examined. Results suggest that the western and central parts of the northern shelf are important.