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Variability in Indonesian Throughflow Upper Hydrology in Response to Precession-Induced Tropical Climate Processes Over the Past 120 kyr
Zhang, Peng1; Xu, Jian1; Beil, Sebastian2; Holbourn, Ann2; Kuhnt, Wolfgang2; Li, Tiegang3; Xiong, Zhifang3; Yan, Hong4; Cui, Rui1; Liu, Heng1; Wu, Hanning1
Corresponding AuthorXu, Jian(jx08@live.cn)
2021-08-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN2169-9275
Volume126Issue:8Pages:17
AbstractThe Indonesian Throughflow (ITF), as the sole low-latitude conduit connecting the Pacific and Indian Oceans, regulates the thermohaline balance between these oceans. Thus, investigating the variability in the ITF and its relationship with the precessional forcing is crucial for understanding the drivers of tropical climate change. Here, we reconstruct the history of the ITF over the past similar to 120 kyr based on high-resolution (similar to 400 years) delta O-18 and Mg/Ca records of Globigerinoides ruber and Pulleniatina obliquiloculata from core SO217-18540 retrieved from the Flores Sea upwelling region within the main pathway of the ITF. A comparison of these new records with published paleo-oceanographic and climatological data from the western tropical Pacific Ocean suggests that annual mean conditions in the Flores Sea were controlled by ITF variability rather than by monsoonal upwelling. Our results further indicate that precessional insolation was a major forcing for the hydrological evolution of the ITF during the past 120 kyr. We suggest that the precessional insolation forcing paced ITF variability by modulating the mean state of El Nino-Southern Oscillation-like conditions and latitudinal shifts and/or expansion/contraction of the Intertropical Convergence Zone. Plain Language Summary The Indonesian Throughflow (ITF) is the only low-latitude current transporting warmer, fresher water masses from the Pacific to the Indian Ocean, regulating the interocean heat and fresh water budgets. The ITF is strongly influenced by shifts in winds and temperatures across the tropical Pacific Ocean (El Nino-Southern Oscillation; ENSO) and by variations in the latitudinal position and intensity of the hottest part of the tropical climate belt (Intertropical Convergence Zone; ITCZ). Hence, understanding past ITF variability is highly relevant to constrain projections of future tropical climate change. Here, we present new upper ocean temperature and salinity records spanning the last 120 kyr from core SO217-18540 retrieved within the main ITF pathway. These records are based on delta O-18 and Mg/Ca analyses of surface and deeper dwelling microscopic zooplankton shells (foraminifera). We found that variations in the ITF intensity and vertical structure were controlled by the similar to 20 kyr wobble of the Earth's axis, which affects the distribution of incoming solar radiation. We ascribe this pattern of variability to shifts in the intensity and/or position of the ITCZ and to changes in winds and temperatures over the tropical Pacific Ocean, similar to the modern ENSO but acting on longer timescales in Earth's history.
DOI10.1029/2020JC017014
WOS KeywordWESTERN EQUATORIAL PACIFIC ; WATER TEMPERATURE-CHANGES ; SEA-SURFACE TEMPERATURE ; WARM POOL ; INDIAN-OCEAN ; EL-NINO ; HYDROCLIMATE ; FORAMINIFERA ; OSCILLATION ; RAINFALL
Indexed BySCI ; SCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41806066] ; National Natural Science Foundation of China[41776060] ; National Natural Science Foundation of China[41830539] ; National Natural Science Foundation of China[91855211] ; Key Laboratory of Ocean and Marginal Sea Geology, Chinese Academy of Sciences[OMG202005] ; German Research Foundation (DFG)[KU 649/32-1] ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences[SKLLQG2012] ; Undergraduate Training Program for Innovation and Entrepreneurship of China[S202010697003] ; Fund for Fostering Talents in Basic Science[XDCX2020-06] ; German Ministry of Science and Education (BMBF)[SO217 MAJA] ; German Ministry of Science and Education (BMBF)[03G0217A]
WOS Research AreaOceanography
Funding OrganizationNational Natural Science Foundation of China ; Key Laboratory of Ocean and Marginal Sea Geology, Chinese Academy of Sciences ; German Research Foundation (DFG) ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences ; Undergraduate Training Program for Innovation and Entrepreneurship of China ; Fund for Fostering Talents in Basic Science ; German Ministry of Science and Education (BMBF)
WOS SubjectOceanography
WOS IDWOS:000690758000041
PublisherAMER GEOPHYSICAL UNION
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Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/16949
Collection古环境研究室
Corresponding AuthorXu, Jian
Affiliation1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian, Peoples R China
2.Univ Kiel, Inst Geosci, Kiel, Germany
3.Minist Nat Resot, Key Lab Marine Geol & Metallogeny, First Inst Oceanog, Qingdao, Peoples R China
4.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Peng,Xu, Jian,Beil, Sebastian,et al. Variability in Indonesian Throughflow Upper Hydrology in Response to Precession-Induced Tropical Climate Processes Over the Past 120 kyr[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2021,126(8):17.
APA Zhang, Peng.,Xu, Jian.,Beil, Sebastian.,Holbourn, Ann.,Kuhnt, Wolfgang.,...&Wu, Hanning.(2021).Variability in Indonesian Throughflow Upper Hydrology in Response to Precession-Induced Tropical Climate Processes Over the Past 120 kyr.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,126(8),17.
MLA Zhang, Peng,et al."Variability in Indonesian Throughflow Upper Hydrology in Response to Precession-Induced Tropical Climate Processes Over the Past 120 kyr".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 126.8(2021):17.
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