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Presence of high nitrate to phosphate ratio subsurface water in the Tsushima Strait during summer
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Description
To identify water with an excess nitrate concentration to phosphate ratio and its potential source, the nutrient concentrations in the Tsushima Strait (TSS) were investigated over ten cruises in August and September 2007–2014, excluding 2010. On the basis of the Redfield ratio, water with an excess nitrate concentration of >1 μM (positive ExNOx water) was identified below the surface mixed layer during four cruises in 2011–2013. Positive ExNOx water was present mainly in less-saline (<34) waters with a density of 22–25 σ θ , and 25–75 m depth. However, in August 2012, positive ExNOx was detected in dense (25–25.5 σ θ ) and deep (50–110 m depth) waters near the salinity maximum, although the salinity during this period was significantly lower than that in other years. The horizontal length of positive ExNOx water was >100 km across the TSS during two cruises in August 2012 and September 2013, respectively. According to multi-regression analysis conducted on the silicate concentration, temperature, and salinity, the silicate concentration was increased in the less-saline subsurface water. The required amount of original freshwater was 108–9 m3 day−1 based on the excess nitrate concentration. This evidence indicates that the positive ExNOx water originated from large river waters such as the Changjiang. Thus, discharged water from the rivers of the East Asia is contributing to the increased N:P ratio in the Tsushima Warm Current, southern Japan Sea.
Journal
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- Journal of oceanography / The Oceanographic Society of Japan
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Journal of oceanography / The Oceanographic Society of Japan 73 (6), 759-769, 2017-12
Tokyo : Springer Nature Japan
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Keywords
Details 詳細情報について
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- CRID
- 1520010380969669888
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- NII Article ID
- 40021382522
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- NII Book ID
- AA10833529
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- ISSN
- 09168370
- 1573868X
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- NDL BIB ID
- 028657911
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- Text Lang
- en
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- Article Type
- journal article
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- NDL Source Classification
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- ZM44(科学技術--地球科学--海洋・陸水・火山)
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- Data Source
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- NDL Search
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE