| Two-phase structure of tropical hydroclimate during Heinrich Stadial 1 and its global implications | |
Huang, Jie1,2,3; Wan, Shiming1,2,3; Li, Anchun1; Li, Tiegang4
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| 2019-10-15 | |
| Source Publication | QUATERNARY SCIENCE REVIEWS
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| ISSN | 0277-3791 |
| Volume | 222Pages:15 |
| Corresponding Author | Huang, Jie(huangjie@qdio.ac.cn) |
| Abstract | Previous studies have proposed that the two-phase structure of Heinrich Stadial 1 (HS1) is a ubiquitous feature. However, few studies have focused on the internal structure of HSI over a tropical domain; thus, the interhemispheric ocean-atmosphere teleconnections during HS1 are poorly defined. Here, we present high-resolution sedimentological, geochemical, and palaeoceanographic records from the core CG2 in the southern South China Sea (SCS), off the northern Sunda Shelf. The core continuously spans 9.0 -22.0 ky BP. The records suggest two episodes of increased monsoon rainfall during the pre-HS1 (similar to 19.0 -18.0 ky BP) and in the early HSI (17.5-16.1 ky BP), along with a weaker monsoon rainfall during the late HSI (16.1-14.7 ky BP). In contrast, a lower precipitation over the Flores Sea occurred during the early HSI, off the southern Sunda Shelf, followed by an enhanced precipitation runoff during the late HS1 (Muller et al., 2012). Notably, these two different precipitation phases characterise a southward Inter-tropical Convergence Zone (ITCZ) shift over the Sunda Shelf during HSI. These changes are also consistent with other monsoon records, as well as other available data from the tropical to high latitudes of both hemispheres, supporting the global scope of the twofold H51. We propose that the two episodes of intense monsoon rainfall over the northern Sunda Shelf during the pre-HS1 and the early HS1 observed in our study are closely linked to two different melting events associated with European ice sheet (EIS) retreat. We further propose that the subsequent maximum Atlantic meridional overturning circulation (AMOC) reduction and the migration of the ITCZ to its southernmost position during the late HSI are tightly connected with the destabilization of the marine-terminating ice-streams of the Laurentide ice sheet (LIS) in the North Atlantic. Tropical positive feedbacks during HS1, in turn, should have played an important role in sustaining the AMOC reduction and Northern Hemisphere (NH) stadial conditions, by continuously lowering the salinity of the low-latitude currents in the Atlantic Ocean. In addition, the tropical ITCZ appears to have been a key bridge in promoting interhemispheric climate connections, by which North Atlantic cooling was rapidly linked to increased Southern Ocean surface westerlies. This, in turn, drove upwelling and CO2 ventilatiOn from the Southern Ocean, and thereby facilitated deglacial warming. Finally, these findings show that tropical climate variation is an important component of deglacial climate changes; understanding how it responds to millennial events like HSI may help us better understand global teleconnections. (C) 2019 Elsevier Ltd. All rights reserved. |
| Keyword | Sunda shelf Tropical ITCZ HS1 European ice sheet AMOC Last deglaciation |
| DOI | 10.1016/j.quascirev.2019.105900 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[41406064] ; National Natural Science Foundation of China[41622603] |
| WOS Research Area | Physical Geography ; Geology |
| WOS Subject | Geography, Physical ; Geosciences, Multidisciplinary |
| WOS ID | WOS:000491685900004 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/164878 |
| Collection | 海洋地质与环境重点实验室 |
| Corresponding Author | Huang, Jie |
| Affiliation | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Shandong, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Shandong, Peoples R China 4.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Shandong, Peoples R China |
| First Author Affilication | Institute of Oceanology, Chinese Academy of Sciences |
| Corresponding Author Affilication | Institute of Oceanology, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Huang, Jie,Wan, Shiming,Li, Anchun,et al. Two-phase structure of tropical hydroclimate during Heinrich Stadial 1 and its global implications[J]. QUATERNARY SCIENCE REVIEWS,2019,222:15. |
| APA | Huang, Jie,Wan, Shiming,Li, Anchun,&Li, Tiegang.(2019).Two-phase structure of tropical hydroclimate during Heinrich Stadial 1 and its global implications.QUATERNARY SCIENCE REVIEWS,222,15. |
| MLA | Huang, Jie,et al."Two-phase structure of tropical hydroclimate during Heinrich Stadial 1 and its global implications".QUATERNARY SCIENCE REVIEWS 222(2019):15. |
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| Two-phase structure （4041KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View | |
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