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A paleoproductivity shift in the northwestern Bay of Bengal (IODP Site U1445) across the Mid-Pleistocene transition in response to weakening of the Indian summer monsoon

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dc.contributor.authorLee, Jongmin-
dc.contributor.authorKim, Sunghan-
dc.contributor.authorKhim, Boo-Keun-
dc.date.accessioned2021-05-07T05:13:28Z-
dc.date.available2021-05-07T05:13:28Z-
dc.date.issued2020-12-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/11866-
dc.description.abstractThe long-term variability of the Indian monsoon in the Bay of Bengal remains inconclusive due to the lack of proximal sedimentary records. To further elucidate the long-term variability of the Indian monsoon, we analyzed the paleoproductivity regime over the last 2.3 Myr at the International Ocean Discovery Program (IODP) Expedition 353 Site U1445 located near the Mahanadi Basin in the northwestern Bay of Bengal. We measured the downcore concentrations and mass accumulation rates (MARs) of biogenic opal, CaCO3, total organic carbon (TOC), and total nitrogen over the Mid-Pleistocene Transition (MPT) to identify the links between surface water marine biogenic production and the Indian summer monsoon. TOC MARs were found to reflect both surface water marine productivity and terrestrial organic matter through the measurements of sediment C/N ratios and δ13CSOM values. Nonetheless, we identified a shift in the paleoproductivity regime from a dominance of biogenic opal deposition prior to the MPT to the dominance of CaCO3 deposition following the MPT. The shift in biogenic marine productivity across the MPT was closely related to riverine discharge, which was primarily controlled by the intensity of the Indian monsoon. Our results, therefore, infer a decrease in riverine discharge to the Bay of Bengal across the MPT in response to a weakened Indian summer monsoon (and/or strengthened Indian winter monsoon). In addition, changes in the intensity of the Indian monsoon across the MPT were more closely linked to the global climate cooling rather than the gradual uplift of the Himalaya and Tibetan Plateau.en_US
dc.languageEnglishen_US
dc.language.isoen_USen_US
dc.subjectPhysical Geographyen_US
dc.subjectGeologyen_US
dc.subjectPaleontologyen_US
dc.subject.classification해당사항없음en_US
dc.titleA paleoproductivity shift in the northwestern Bay of Bengal (IODP Site U1445) across the Mid-Pleistocene transition in response to weakening of the Indian summer monsoonen_US
dc.title.alternative플라이스토세 중기 동안 인도 여름 몬순 약화에 따른 벵갈만에서의 고생산성 천이en_US
dc.typeArticleen_US
dc.identifier.bibliographicCitationLee, Jongmin, Kim, Sunghan, Khim, Boo-Keun. 2020. "A paleoproductivity shift in the northwestern Bay of Bengal (IODP Site U1445) across the Mid-Pleistocene transition in response to weakening of the Indian summer monsoon". <em>PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY</em>, 560(1): 110018-110027.en_US
dc.citation.titlePALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGYen_US
dc.citation.volume560en_US
dc.citation.number1en_US
dc.identifier.doi10.1016/j.palaeo.2020.110018-
dc.citation.startPage110018en_US
dc.citation.endPage110027en_US
dc.description.articleClassificationSCI-
dc.description.jcrRateJCR 2018:7.018en_US
dc.subject.keywordOrganic carbonen_US
dc.subject.keywordBiogenic opalen_US
dc.subject.keywordCalcium carbonateen_US
dc.subject.keywordOrganic carbon isotopesen_US
dc.subject.keywordSurface water productivityen_US
dc.subject.keywordRiverine dischargeen_US
dc.identifier.localId2020-0128-
dc.identifier.scopusid2-s2.0-85091631660-
dc.identifier.wosid000591245000029-
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