Paleoproductivity evolution in the West Philippine Sea during the last 700 ka

• Published in: Chinese Journal of Oceanology and Limnology
• Main Authors: Tang Zheng, Li Tiegang, Chang Fengming, Nan Qingyun, Li Qing, Li, TG
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2013
• Subjects: Paleoproductivity; Thermocline Depth; Paleo-enso; West Philippine Sea; Marine & Freshwater Biology; Oceanography; Limnology; Science & Technology; Life Sciences & Biomedicine; Physical Sciences; SOUTH CHINA SEA; EQUATORIAL PACIFIC-OCEAN; SURFACE TEMPERATURE; BENTHIC FORAMINIFERA; LATE PLEISTOCENE; CARBON-DIOXIDE; ICE-CORE; CLIMATE; PRODUCTIVITY; VARIABILITY; Pacific; EPICA; ice core
• Online Access: http://ir.qdio.ac.cn/handle/337002/16311; https://doi.org/10.1007/s00343-013-2117-z

In order to reconstruct the paleoproductivity evolution history of the West Philippine Sea during the last 700 ka, the vertical gradient of Delta delta C-13 in dissolved inorganic carbon (Delta delta C-13 between those of foraminifera Pulleniatina obliquiloculata and Cibicidoides wuellerstorfi) and planktonic foraminiferal assemblages were analysed in piston Core MD06-3047 retrieved from the Benham Rise (east of the Luzon Island). Paleoproductivity evolution in the West Philippine Sea during the last 700 ka is closely related to glacial-interglacial cycles and precession-controlled insolation. Controlling factors of paleoproductivity could have been both thermocline fluctuations related with ENSO-like processes and eolian input associated with East Asian winter monsoon, and the former could have been the primary factor. A higher productivity and a shallower thermocline coeval with the occurrence of low CO2 concentrations in the EPICA Dome C ice core might indicate that biological export production in the low-latitude could act as a significant sink in the global carbon cycle, and modify atmospheric CO2 concentrations. Spectral analysis further reveals that the paleoproductivity is mainly controlled by thermocline fluctuations subjected to ENSO processes responding to processional variability of insolation. High coherences in eccentricity, obliquity and precession periods further revealing the close link between thermocline fluctuations, paleoproductivity and atmospheric CO2 levels. In order to reconstruct the paleoproductivity evolution history of the West Philippine Sea during the last 700 ka, the vertical gradient of Delta delta C-13 in dissolved inorganic carbon (Delta delta C-13 between those of foraminifera Pulleniatina obliquiloculata and Cibicidoides wuellerstorfi) and planktonic foraminiferal assemblages were analysed in piston Core MD06-3047 retrieved from the Benham Rise (east of the Luzon Island). Paleoproductivity evolution in the West Philippine Sea during the last 700 ka is closely related to ...