Dataset Information

Interplay between the Westerlies and Asian monsoon recorded in Lake Qinghai sediments since 32 ka.

ABSTRACT: Two atmospheric circulation systems, the mid-latitude Westerlies and the Asian summer monsoon (ASM), play key roles in northern-hemisphere climatic changes. However, the variability of the Westerlies in Asia and their relationship to the ASM remain unclear. Here, we present the longest and highest-resolution drill core from Lake Qinghai on the northeastern Tibetan Plateau (TP), which uniquely records the variability of both the Westerlies and the ASM since 32 ka, reflecting the interplay of these two systems. These records document the anti-phase relationship of the Westerlies and the ASM for both glacial-interglacial and glacial millennial timescales. During the last glaciation, the influence of the Westerlies dominated; prominent dust-rich intervals, correlated with Heinrich events, reflect intensified Westerlies linked to northern high-latitude climate. During the Holocene, the dominant ASM circulation, punctuated by weak events, indicates linkages of the ASM to orbital forcing, North Atlantic abrupt events, and perhaps solar activity changes.

SUBMITTER: An Z

PROVIDER: S-EPMC3431539 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Publications

Interplay between the Westerlies and Asian monsoon recorded in Lake Qinghai sediments since 32 ka.

An Zhisheng Z Colman Steven M SM Zhou Weijian W Li Xiaoqiang X Brown Eric T ET Jull A J Timothy AJ Cai Yanjun Y Huang Yongsong Y Lu Xuefeng X Chang Hong H Song Yougui Y Sun Youbin Y Xu Hai H Liu Weiguo W Jin Zhangdong Z Liu Xiaodong X Cheng Peng P Liu Yu Y Ai Li L Li Xiangzhong X Liu Xiuju X Yan Libin L Shi Zhengguo Z Wang Xulong X Wu Feng F Qiang Xiaoke X Dong Jibao J Lu Fengyan F Xu Xinwen X

Scientific reports 20120831

Two atmospheric circulation systems, the mid-latitude Westerlies and the Asian summer monsoon (ASM), play key roles in northern-hemisphere climatic changes. However, the variability of the Westerlies in Asia and their relationship to the ASM remain unclear. Here, we present the longest and highest-resolution drill core from Lake Qinghai on the northeastern Tibetan Plateau (TP), which uniquely records the variability of both the Westerlies and the ASM since 32 ka, reflecting the interplay of thes ...[more]

PMID: 22943005

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Project description:Comprehensive comparison of paleoclimate change based on records constrained by precise chronology and high-resolution is essential to explore the correlation and interaction within earth climate systems. Here, we propose a new stalagmite-based multidecadal resolved Asian summer monsoon (ASM) record spanning the past thirty-seven thousand years (ka BP, before AD 1950) from Furong Cave, southwestern China. This record is consistent with the published Chinese stalagmite sequences and shows that the dominant controls of the ASM dynamics include not only insolation and solar activity but also suborbital-scale hydroclimate events in the high latitudes of the northern hemisphere, such as the Heinrich events, Bølling-Allerød (BA), and Younger Dryas (YD). Benefit from the unprecedented accurate chronology, the timings of these events are precisely dated, with uncertainties of, at most, 40 years (2σ). The onset of the weak ASM during the YD began at 12.92 ka BP and lasted for 430 years. The occurrence of the 200-yr Older Dryas during the BA period was dated from 13.87 to 14.06 ka BP. The durations of the three Heinrich (H) events, H1, H2, and H3, are 14.33-18.29, 23.77-24.48, and 28.98-30.46 ka BP, respectively. Furong record shows surprisingly variable onset transitions of 980, 210, and 40 years for the corresponding weak ASM events. These discrepancies suggest different influences of the H events on ASM dynamics. During the periods of H 1-3, the obvious difference between our Furong record and NGRIP δ18O record indicated the decoupling correlation between the mid-low latitudes and high latitudes. On the other hand, synchronous climate change in high and low latitudes suggests another possibility which different to the dominant role of Northern high latitudes in triggering global climate change. Our high quality records also indicate a plausible different correlation between the high and mid-low latitudes under glacial and inter-glacial background, especially for the ASM regimes.

Dataset Information

Interplay between the Westerlies and Asian monsoon recorded in Lake Qinghai sediments since 32 ka.

Publications

Interplay between the Westerlies and Asian monsoon recorded in Lake Qinghai sediments since 32 ka.

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