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

Journal of Oceanology and Limnology 2023年第4期41卷 1454-1463页

作者： Ruixue XIA Qiang XIE Weiqiang WANG Hongzhou XU Xuekun SHANG Yeqiang SHU Institute of deep-Sea Science and Engineering Chinese Academy of SciencesSanya 572000China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China School of Marine Sciences Sun Yat-sen UniversityGuangzhou 510275China

upper Circumpolar deep Water(UCDW)and North Pacifi c deep Water(NPDW)coexist in the upper deep layer(i.e.,with a 1.2-2.0-℃potential temperature range and a 2000-4100-dbar pressure range)of the Eastern Philippine *** have similar properties in potential temperature and salinity,while have a signifi cant diff erence in dissolved *** 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 *** silicate increased in 1995,1996,2005,2006,and 2007,and decreased in 1997,2000,2001,2002,and *** analysis showed that the large diff erence between positive and negative dissolved silicate anomalies occurred mainly at~15°N and north of 25°N,with the concentration reaching 4.25μmol/*** analysis indicated that the interannual dissolved silicate variability was related to the zonal current variation in the upper deep *** relatively strong(weak)westward current transport increased(decreased)NPDW to the Eastern Philippine Sea,thereby resulting in increased(decreased)dissolved silicate.

关键词： interannual variability North Pacific deep water upper deep layer dissolved silicate zonal velocity variability

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