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  • 1
    Publication Date: 2021-08-05
    Description: Paleoceanographic evidence commonly indicates that Last Glacial Maximum surface temperatures in the Japan Sea were comparable to modern conditions, in striking difference to colder neighboring regions. Here, based on a core from the central Japan Sea, our results show similar UK′37‐ and TEXL86‐derived temperatures between 24.7 and 16.3 ka BP, followed by an abrupt divergence at ~16.3 ka BP and a weakening of divergence after ~8.7 ka BP. We attribute this process to a highly stratified glacial upper ocean controlled by the East Asian Summer Monsoon, increasing thermal gradient between surface and subsurface layers during the deglaciation and the intrusion of Tsushima Warm Current since the mid‐Holocene, respectively. Therefore, we suggest that threshold‐like changes in upper‐ocean temperatures linked to sea level rise and monsoon dynamics, rather than just sea surface temperatures, play a critical role in shaping the thermal and ventilation history of this NW Pacific marginal sea.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
    Publication Date: 2023-03-10
    Description: The global climate has been gradually cooling over the Cenozoic and is punctuated by the intensification of Northern Hemisphere Glaciation (NHG) from the latest Pliocene to earliest Pleistocene (∼3.1–2.5 millions of years ago, Ma). A decline of atmospheric CO2 is supposed as a prerequisite for the NHG, but the associated carbon-cycle processes remain elusive. Here we combine foraminiferal records of neodymium isotope and boron-calcium ratio, and simulations of an Earth system model, to investigate changes in the water-mass composition and carbonate-ion concentration of the deep Pacific Ocean during the NHG. Our proxy records have revealed a significant expansion of southern-sourced waters with increased respired carbon storage into the deep Pacific during the NHG. These changes may be explained by strengthened deep-water formation and biological-pump efficiency in the Southern Ocean due to Antarctic sea-ice growth, as suggested by our model experiments and evidence from the Sub-Antarctic region. These results provide key clues for quantifying the role of the dissolved inorganic carbon content of deep Pacific waters in modulating atmospheric CO2 during the NHG.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
    Publication Date: 2022-10-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Wang, P., Huang, C., Lin, J., Jian, Z., Sun, Z., & Zhao, M. The South China Sea is not a mini-Atlantic: plate-edge rifting vs intra-plate rifting. National Science Review, 6(5), (2019): 902-913, doi:10.1093/nsr/nwz135.
    Description: The South China Sea, as ‘a non-volcanic passive margin basin’ in the Pacific, has often been considered as a small-scale analogue of the Atlantic. The recent ocean drilling in the northern South China Sea margin found, however, that the Iberian model of non-volcanic rifted margin from the Atlantic does not apply to the South China Sea. In this paper, we review a variety of rifted basins and propose to discriminate two types of rifting basins: plate-edge type such as the South China Sea and intra-plate type like the Atlantic. They not only differ from each other in structure, formation process, lifespan and geographic size, but also occur at different stages of the Wilson cycle. The intra-plate rifting occurred in the Mesozoic and gave rise to large oceans, whereas the plate-edge rifting took place mainly in the mid-Cenozoic, with three-quarters of the basins concentrated in the Western Pacific. As a member of the Western Pacific system of marginal seas, the South China Sea should be studied not in isolation on its origin and evolution, but in a systematic context to include also its neighboring counterparts.
    Description: This work was supported by the National Natural Science Foundation of China as a part of the ‘South China Sea Deep’ Project (91128000).
    Keywords: Rifting ; Marginal basin ; Passive margin ; South China Sea ; Western Pacific ; Subduction
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 4
    Publication Date: 2022-10-26
    Description: Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography and Paleoclimatology 35(12), (2020): e2020PA003853, https://doi.org/10.1029/2020PA003853.
    Description: During the middle Miocene, Earth's climate changed from a global warm period (Miocene Climatic Optimum) into a colder one with the expansion of the Antarctic ice sheet. This prominent climate transition was also a period of drastic changes in global atmospheric circulation. The development of the South Asian monsoon is not well understood and mainly derived from proxy records of wind strength. Data for middle Miocene changes in rainfall are virtually non‐existent for India and the Arabian Sea prior to 11 Ma. This study presents planktic foraminiferal trace element (Mg/Ca and Ba/Ca) and stable oxygen isotope records from NGHP‐01 Site 01A off the coast of West India in the Eastern Arabian Sea (EAS) to reconstruct the regional surface hydrography and hydroclimate in the South Asian monsoon (SAM) region during the middle Miocene. The Ba/Ca and local seawater δ18O (δ18Osw) changes reveal a notable gradual increase in SAM rainfall intensity during the middle Miocene. Additionally to this long‐term increase in precipitation, the seawater δ18O is punctuated by a prominent decrease, i.e. freshening, at ~14 Ma contemporary with Antarctic glaciation. This suggests that Southern Ocean Intermediate Waters (SOIW) transmitted Antarctic salinity changes into the Arabian Sea via an “oceanic tunnel” mechanism. The middle Miocene increase in SAM rainfall is consistent with climate model simulations of an overall strengthening Asian monsoon from the Eocene to the middle/late Miocene with a further acceleration after the middle Miocene climate transition.
    Description: This study has been funded by the National Natural Science Foundation of China through a grant to S. Steinke (NSFC grant No. 41776055) and Z. Jian and S. Steinke (NSFC grant No. 919582080). We express our gratitude to H. Kuhnert (MARUM, University of Bremen) and his team for stable isotope analyses. We thank P. Qiao (Tongji University Shanghai) for technical and analytical support with the ICP‐MS analyses, A. Dolman (Alfred‐Wegener‐Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany) for statistical analyses, and B. Wang (State Key Laboratory of Marine Environmental Science, Xiamen University) and his team for the SEM‐EDAX Energy Dispersive X‐ray Spectroscopy (EDS) analyses. L. Giosan acknowledges funding from USSP and WHOI and thanks colleagues and crew from the NGHP‐01 expedition for intellectual interactions leading to long‐standing interests in the fluvial‐continental margin systems of Peninsular India. J. Groeneveld thanks the State Key Laboratory of Marine Environmental Science (Xiamen University) for a MEL Senior Visiting Fellowship (Project No. MELRS1915).
    Description: 2021-05-27
    Keywords: Middle Miocene ; South Asian monsoon ; Arabian Sea ; Stable isotopes ; Trace elements
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 5
    Publication Date: 2022-05-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Sun, Z., Lin, J., Qiu, N., Jian, Z., Wang, P., Pang, X., Zheng, J., & Zhu, B. The role of magmatism in the thinning and breakup of the South China Sea continental margin: Special Topic: the South China Sea Ocean Drilling. National Science Review, 6(5), (2019): 871-876, doi:10.1093/nsr/nwz116.
    Description: Magmatism plays a key role in the process of continental margin breakup and ocean formation. Even in the extremely magma-poor Iberia and Newfoundland margin, studies of field outcrops have shown that syn-rift magmatism had participated in rifting from a very early stage and contributed directly to the rifting process. The final transition from exhumed continental mantle to the ocean formation is also triggered by the accumulation and eruption of magma [1]. Therefore, Atlantic-type passive continental margins are classified into two end-members: magma-poor (non-volcanic) and magma-rich (volcanic). The differences between them lie in whether a large amount of intrusive and extrusive magmatism from the mantle plume/hotspot is involved in the syn-rift and breakup stages. A magma-rich margin [2] should include the following characteristics: (i) a high-velocity lower crust (HVLC) caused by syn-rift mafic magma underplating; (ii) continental crust intruded by abundant sills and dikes; (iii) a large volume of seaward-dipping reflectors (SDRs) caused by flood basalt eruption or tuffs. All other margins are classified as magma-poor margins.
    Description: We thank the research team project of Guangdong Natural Science Foundation (2017A030312002), IODP-China and South China Sea Deep Project (91628301) and K.C. Wong Education Foundation (GJTD-2018-13) for providing support for the research. This research was also supported by the China National Science and Technology Major Project (2016ZX05026–003), the joint foundation of the National Natural Science Foundation of China and Guangdong province (U1301233), as well as the National Natural Science Foundation of China (41576070 and 41890813).
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 6
    Publication Date: 2023-03-07
    Keywords: AGE; Age model according to Lisiecki & Raymo (2005) [LR04]; Core; CORE; DEPTH, sediment/rock; foraminifera oxygen isotopes; Indo-Pacific Warm Pool (IPWP); isotope-enabled transient simulation; Late Quaternary; Marine isotope stage; MD10-3340; ocean heat content; upper ocean temperatures
    Type: Dataset
    Format: text/tab-separated-values, 16 data points
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  • 7
    Publication Date: 2023-03-07
    Keywords: Age model according to Lisiecki & Raymo (2005) [LR04]; Calendar age; DEPTH, sediment/rock; foraminifera oxygen isotopes; GC; Gravity corer; Indo-Pacific Warm Pool (IPWP); isotope-enabled transient simulation; Kexue; KX08-973; KX21-2; Late Quaternary; ocean heat content; upper ocean temperatures
    Type: Dataset
    Format: text/tab-separated-values, 24 data points
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  • 8
    Publication Date: 2023-03-07
    Keywords: Age model according to Lisiecki & Raymo (2005) [LR04]; Calendar age; CALYPSO; Calypso Corer; DEPTH, sediment/rock; foraminifera oxygen isotopes; Indo-Pacific Warm Pool (IPWP); isotope-enabled transient simulation; Late Quaternary; ocean heat content; SO18480-3; upper ocean temperatures
    Type: Dataset
    Format: text/tab-separated-values, 21 data points
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  • 9
    Publication Date: 2023-01-13
    Description: The datasets contain the foraminifera oxygen isotope records over the last ~400 ka of two western equatorial Pacific cores, KX21-2 (01°25.0'S, 157°58.9'E, 1897 m water depth) and KX12-1 (01°48.8'S, 143°40.1'E, 1568 m water depth). There are three data sheets, including (1) benthic foraminifera (Cibicidoides wuellerstorfi) d18O of KX21-2, (2) planktonic foraminifera (Globigerinoides ruber s.s.) d18O of KX21-2, and (3) planktonic foraminifera (Globigerinoides ruber s.s.) d18O of KX12-1.
    Keywords: foraminifera oxygen isotopes. Late Quaternary; western equatorial Pacific
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 10
    Publication Date: 2023-01-30
    Description: This data set contains a compilation of records of sea-surface and thermocline temperatures, derived from planktonic foraminifera Mg/Ca, for the Indo-Pacific Warm Pool (ranges 14.8°N-13.1°S, 115.2°E-158.0°E) over the past 25,000 years. It contains two sets of data-sheets (six sheets). Set 1: the mean anomaly stacks of sea-surface temperature anomaly )(SSTA, sheet 1), thermocline water temperature anomaly (TWTA, sheet 2), oxygen isotope composition of Globigerinoides ruber (Gr-A, sheet 3) and surface water oxygen isotope composition (Δδ18Osw, sheet 4) of IPWP over the last 25 ka. Set 2: the records of Mg/Ca and calibrated temperatures of Cores MD10-3340 (0.52°S, 128.72°E, sheet 5), SO18480 (12.06°S, 121.65°E, sheet 6) and KX21-2 (1.42°S, 157.98°E, sheet 7) firstly reported in this study.
    Keywords: Deglaciation; Holocene; Indo-Pacific Warm Pool; LGM; Thermocline
    Type: Dataset
    Format: application/zip, 4 datasets
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