Journal ArticleDOI
Past dynamics of the East Asian monsoon: No inverse behaviour between the summer and winter monsoon during the Holocene
Stephan Steinke,Cornelia Glatz,Mahyar Mohtadi,Jeroen Groeneveld,Qianyu Li,Zhimin Jian +5 more
- Vol. 78, Iss: 3, pp 170-177
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TLDR
In this paper, Wang et al. derived estimates of the vertical thermal structure from the difference (∆T) in Mg/Ca-based temperatures between surface- ( Globigerinoides ruber ) and thermocline-dwelling ( Pulleniatina obliquiloculata) planktonic foraminifera, and the temperature difference between alkenone and P. obloculata in core MD05-2904 located in the northern South China Sea (SCS).Abstract:
We use new and published data to discuss the East Asian winter monsoon (EAWM) development and the relationship between the EAWM and the East Asian summer monsoon (EASM) since the Last Glacial Maximum (LGM) with special emphasis on the Holocene. The depth of the mixed layer in the northern South China Sea (SCS) is strongly modulated by the seasonal reversing monsoon winds with deeper vertical mixing during the winter monsoon season and less mixing during the summer monsoon season. Reconstructing the relative depth of the mixed layer thus represents a sensitive diagnostic variable of past changes in the EAWM strength. We derived estimates of the vertical thermal structure from the difference (∆T) in Mg/Ca-based temperatures between surface- ( Globigerinoides ruber ) and thermocline-dwelling ( Pulleniatina obliquiloculata) planktonic foraminifera, and the temperature difference between alkenone and P. obliquiloculata in core MD05-2904 located in the northern SCS. Our ∆T estimates suggest enhanced upper water column mixing due to strengthened EAWM winds during the last glacial, consistent with other marine and terrestrial records as well as model simulations that also suggest a dominance of the cold and dry northwesterly winter monsoon system during the last glacial. Our ∆T estimates reveal that the EAWM was weaker during the Holocene compared to the last glacial. We find that EAWM and EASM changes show an inverse behaviour during the last glacial that is consistent with previous studies but co-varied during the Holocene. It can be inferred from these findings that the variability of the East Asian monsoon during the Holocene is more complex than the simple anti-phase relationship between summer and winter monsoon as assumed previously. The early-mid Holocene strengthening of both the EAWM and the EASM is most likely attributed to the higher summer insolation that resulted in a stronger seasonal contrast.read more
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Authigenic carbonates from newly discovered active cold seeps on the northwestern slope of the South China Sea: Constraints on fluid sources, formation environments, and seepage dynamics
Qianyong Liang,Yu Hu,Dong Feng,Jörn Peckmann,Jörn Peckmann,Linying Chen,Shengxiong Yang,Jinqiang Liang,Jun Tao,Duofu Chen +9 more
TL;DR: Authigenic carbonates recovered from two newly discovered active cold seeps on the northwestern slope of the South China Sea have been studied using petrography, mineralogy, stable carbon and oxygen isotopic, as well as trace element compositions, together with AMS 14C ages of seep-dwelling bivalves to unravel fluid sources, formation conditions, and seepage dynamics as mentioned in this paper.
Journal ArticleDOI
Assessing the impact of Laurentide Ice Sheet topography on glacial climate
D. J. Ullman,D. J. Ullman,Allegra N. LeGrande,Anders E. Carlson,Anders E. Carlson,Faron S. Anslow,Joseph M. Licciardi +6 more
TL;DR: In this paper, the Laurentide Ice Sheet (LIS) was used to assess the range of climate variability in response to uncertainty in this boundary condition and the results suggest that such uncertainty in ice-sheet boundary conditions alone may significantly impact the results of paleoclimate simulations and their ability to successfully simulate past climates, with implications for estimating climate sensitivity to greenhouse gas forcing utilizing past climate states.
Journal ArticleDOI
Biogeochemical evidence of Holocene East Asian summer and winter monsoon variability from a tropical maar lake in southern China
Guodong Jia,Yang Bai,Xiaoqiang Yang,Luhua Xie,Gangjian Wei,Tingping Ouyang,Guoqiang Chu,Zhonghui Liu,P. Peng +8 more
TL;DR: In this paper, the authors used the proxies of TOC, δ13Corg, and leaf wax n-alkane values to reconstruct the lake conditions, which revealed patterns in monsoonal changes during the Holocene.
Journal ArticleDOI
Grain size records reveal variability of the East Asian Winter Monsoon since the Middle Holocene in the Central Yellow Sea mud area, China
TL;DR: In this paper, three cores from the Central Yellow Sea mud (CYSM) were analyzed in sensitive grain size and AMS 14C dating to reconstruct the history of the East Asian Winter Monsoon since the Middle Holocene in the study area.
Journal ArticleDOI
Solar forcing of centennial-scale East Asian winter monsoon variability in the mid- to late Holocene
Takuya Sagawa,Michinobu Kuwae,Kentaro Tsuruoka,Yugo Nakamura,Minoru Ikehara,Masafumi Murayama +5 more
TL;DR: In this paper, the authors present a high-resolution (∼30-yr spacing) planktonic foraminiferal δ O 18 record of Neogloboquadrina incompta (dextral form), which reflects sea surface temperature during the winter season, for the last 6000 yrs from marine sediments in the western North Pacific.
References
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Journal ArticleDOI
Extended 14C Data Base and Revised Calib 3.0 14C Age Calibration Program
Minze Stuiver,Paula J. Reimer +1 more
TL;DR: The age calibration program, CALIB (Stuiver & Reimer 1986), first made available in 1986 and subsequently modified in 1987 (revision 2.0 and 2.1), has been amended anew as mentioned in this paper.
Journal ArticleDOI
A High-Resolution Absolute-Dated Late Pleistocene Monsoon Record from Hulu Cave, China
Yongjin Wang,Yongjin Wang,Hai Cheng,Richard Lawrence Edwards,Zhisheng An,Jiangying Wu,Chuan-Chou Shen,Jeffrey A. Dorale +7 more
TL;DR: The record links North Atlantic climate with the meridional transport of heat and moisture from the warmest part of the ocean where the summer East Asian Monsoon originates and generally agrees with the timing of temperature changes from the Greenland Ice Sheet Project Two (GISP2).
Journal ArticleDOI
The holocene Asian monsoon : links to solar changes and North Atlantic climate
Yongjin Wang,Hai Cheng,Hai Cheng,R. Lawrence Edwards,Yaoqi He,Xinggong Kong,Zhisheng An,Jiangying Wu,Megan J. Kelly,Carolyn A. Dykoski,Xiangdong Li +10 more
TL;DR: A 5-year-resolution absolute-dated oxygen isotope record from Dongge Cave, southern China, provides a continuous history of the Asian monsoon over the past 9000 years, and shows that some, but not all, of the monsoon variability at these frequencies results from changes in solar output.
Journal ArticleDOI
Millennial- and orbital-scale changes in the East Asian monsoon over the past 224,000 years
Yongjin Wang,Hai Cheng,Hai Cheng,R. Lawrence Edwards,Xinggong Kong,Xiaohua Shao,Shitao Chen,Jiangyin Wu,Xiouyang Jiang,Xianfeng Wang,Zhisheng An +10 more
TL;DR: An absolute-dated oxygen isotope record from Sanbao cave, central China, is presented that completes a Chinese-cave-based record of the strength of the East Asian monsoon that covers the past 224,000 years, supporting the idea that tropical/subtropical monsoons respond dominantly and directly to changes in Northern Hemisphere summer insolation on orbital timescales.
Journal ArticleDOI
A high-resolution, absolute-dated Holocene and deglacial Asian monsoon record from Dongge Cave, China
Carolyn A. Dykoski,R. Lawrence Edwards,Hai Cheng,Daoxian Yuan,Yanjun Cai,Meiliang Zhang,Yushi Lin,Jiaming Qing,Zhisheng An,Justin Revenaugh +9 more
TL;DR: In this paper, the authors present a continuous record of the Asian monsoon over the last 16 ka from δ18O measurements of stalagmite calcite, which is combined with a chronology from 45 precise 230Th dates.
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