Variation in concentration of dissolved silicate in the Eastern Philippine deep sea -- Journal of Oceanology and Limnology,2023,41(4):1454-1463

	Cite this paper:
	Ruixue XIA, Qiang XIE, Weiqiang WANG, Hongzhou XU, Xuekun SHANG, Yeqiang SHU. Variation in concentration of dissolved silicate in the Eastern Philippine deep sea[J]. Journal of Oceanology and Limnology, 2023, 41(4): 1454-1463

Variation in concentration of dissolved silicate in the Eastern Philippine deep sea

Ruixue XIA^1,6, Qiang XIE^1,4,5, Weiqiang WANG^2,3, Hongzhou XU¹, Xuekun SHANG⁷, Yeqiang SHU^2,3

1 Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China;
2 State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
3 Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou), Guangzhou 511458, China;
4 Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China;
5 Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;
6 University of Chinese Academy of Sciences, Beijing 100049, China;
7 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China

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-℃ 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.

Key words: interannual variability|North Pacific deep water|upper deep layer|dissolved silicate|zonal velocity variability

Received: 2021-12-22 Revised:

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