Abstract
Upper Circumpolar Deep Water (UCDW) and North Pacific Deep Water (NPDW) coexist in the upper deep layer (i.e., with a 1.2–2.0-°C potential temperature range and a 2 000–4 100-dbar pressure range) of the Eastern Philippine Sea. They have similar properties in potential temperature and salinity, while have a significant difference in dissolved silicate. Based on the repeated observations along a 137°E transect from the World Ocean Database (WOD18), this study revealed the interannual variability of dissolved silicate in the upper deep layer of the Eastern Philippine Sea. Dissolved silicate increased in 1995, 1996, 2005, 2006, and 2007, and decreased in 1997, 2000, 2001, 2002, and 2004. Composition analysis showed that the large difference between positive and negative dissolved silicate anomalies occurred mainly at ∼15°N and north of 25°N, with the concentration reaching 4.25 µmol/g. Further analysis indicated that the interannual dissolved silicate variability was related to the zonal current variation in the upper deep layer. The relatively strong (weak) westward current transport increased (decreased) NPDW to the Eastern Philippine Sea, thereby resulting in increased (decreased) dissolved silicate.
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Data Availability Statement
The datasets analyzed during the current study are available from the corresponding authors upon reasonable request.
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8 Acknowledgment
We are grateful to all the people working for the cruise observations along the 137°E transect in the Philippine Sea.
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Supported by the National Key Research and Development Program of China (No. 2018YFC0309800), the National Natural Science Foundation of China (Nos. 42176021, 91858203), the Open Project Program of State Key Laboratory of Tropical Oceanography (No. LTOZZ2001), and the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (No. GML2019ZD0304)
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Xia, R., Xie, Q., Wang, W. et al. Variation in concentration of dissolved silicate in the Eastern Philippine deep sea. J. Ocean. Limnol. 41, 1454–1463 (2023). https://doi.org/10.1007/s00343-022-1439-0
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DOI: https://doi.org/10.1007/s00343-022-1439-0