scholarly journals The Indian Summer Monsoon from a Speleothem δ18O Perspective—A Review

Quaternary ◽  
2018 ◽  
Vol 1 (3) ◽  
pp. 29 ◽  
Author(s):  
Nikita Kaushal ◽  
Sebastian F. M. Breitenbach ◽  
Franziska A. Lechleitner ◽  
Ashish Sinha ◽  
Vinod C. Tewari ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Data Model ◽  
Asian Summer Monsoon ◽  
High Amplitude ◽  
Vital Role ◽  
Atmospheric Circulation Patterns ◽  
Monsoon Variability ◽  
Circulation Patterns ◽  
Asian Summer ◽  
Global Population

As one of the most prominent seasonally recurring atmospheric circulation patterns, the Asian summer monsoon (ASM) plays a vital role for the life and livelihood of about one-third of the global population. Changes in the strength and seasonality of the ASM significantly affect the ASM region, yet the drivers of change and the varied regional responses of the ASM are not well understood. In the last two decades, there were a number of studies reconstructing the ASM using stalagmite-based proxies such as oxygen isotopes (δ18O). Such reconstructions allow examination of ASM drivers and responses, increasing monsoon predictability. In this review paper, we focus on stalagmite δ18O records from India at the proximal end of the ASM region. Indian stalagmite δ18O records show well-dated, high-amplitude changes in response to the dominant drivers of the ASM on orbital to multi-centennial timescales, and indicate the magnitude of monsoon variability in response to these drivers. We examine Indian stalagmite records collated in the Speleothem Isotope Synthesis and AnaLysis version 1 (SISAL_v1) database (http://researchdata.reading.ac.uk/139/) and support the database with a summary of record quality and regional climatic interpretations of the δ18O record during different climate states. We highlight current debates and suggest the most useful time periods (climatic events) and locations for further work using tools such as data-model comparisons, spectral analysis methods, multi-proxy investigations, and monitoring.

scholarly journals The Indian Summer Monsoon from a Speleothem d18O Perspective – a Review

2018 ◽  
Author(s):  
Nikita Kaushal ◽  
Sebastian F. M. Breitenbach ◽  
Franziska A. Lechleitner ◽  
Ashish Sinha ◽  
Vinod C. Tewari ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Data Model ◽  
Asian Summer Monsoon ◽  
High Amplitude ◽  
Vital Role ◽  
Atmospheric Circulation Patterns ◽  
Monsoon Variability ◽  
Circulation Patterns ◽  
Asian Summer ◽  
Global Population

As one of the most prominent seasonally recurring atmospheric circulation patterns, the Asian Summer Monsoon (ASM) plays a vital role for the life and livelihood of about a third of the global population. Changes in the strength and seasonality of the ASM significantly affect the region, yet the drivers of change and the varied regional responses of the ASM are not well understood. In the last two decades, there have been a number of studies reconstructing the ASM using stalagmite-based proxies such as oxygen isotopes (18O). Such reconstructions allow examination of the drivers and responses, increasing monsoon predictability. In this review paper, we focus on stalagmite 18O records from India at the proximal end of the ASM region. Indian stalagmite 18O records show well dated, high amplitude changes in response to the dominant drivers of the ASM on orbital to multi-centennial timescales and indicate the magnitude of monsoon variability in response to these drivers. We examine Indian stalagmite records collated in SISAL_v1 (version 1) database (http://researchdata.reading.ac.uk/139/) and support the database with a summary of record quality and regional climatic interpretations of the 18O record during different climate states. We highlight current debates and suggest the most useful time periods (climatic events) and locations for further work using tools such as data-model comparisons, spectral analysis methods, multi-proxy investigations and monitoring work

Decadal- to Centennial-Scale East Asian Summer Monsoon Variability Over the Past Millennium: An Oceanic Perspective

2018 ◽  
Vol 45 (15) ◽  
pp. 7711-7718 ◽  
Author(s):  
Richard Ching Wa Cheung ◽  
Moriaki Yasuhara ◽  
Briony Mamo ◽  
Kota Katsuki ◽  
Koji Seto ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
The Past ◽  
Monsoon Variability ◽  
Asian Summer ◽  
Past Millennium

Astronomical and glacial forcing of East Asian summer monsoon variability

2015 ◽  
Vol 115 ◽  
pp. 132-142 ◽  
Author(s):  
Youbin Sun ◽  
John Kutzbach ◽  
Zhisheng An ◽  
Steven Clemens ◽  
Zhengyu Liu ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
Monsoon Variability ◽  
Asian Summer

scholarly journals Atlantic meridional overturning circulation modulation of late Pleistocene to middle Holocene Asian summer monsoon variability and palaeoanthropological implications

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Xinxia Li ◽  
Guoqiao Xiao ◽  
Shan Lin ◽  
Xiaoke Qiang ◽  
Hong Ao
Keyword(s):  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Atlantic Meridional Overturning Circulation ◽  
Meridional Overturning Circulation ◽  
Monsoon Precipitation ◽  
Middle Holocene ◽  
Nihewan Basin ◽  
Monsoon Variability ◽  
Meridional Overturning ◽  
Asian Summer

Abstract Asia contains more than half the world’s population, and their lives are significantly related to summer monsoon moisture supply. Here, we investigate features and dynamics of late Pleistocene–middle Holocene Asian summer monsoon variability in the Nihewan Basin, North China, which was a critical home for early humans in East Asia throughout the Quaternary. We present new mineral magnetic records between ∼16 and 6 ka from the Yujiagou archeological site in the northern Nihewan Basin, which contains >40 000 stone tools, 2 pottery pieces and 19 686 mammal fossils. Magnetic properties of the Yujiagou section are dominated by pedogenic fine-grained magnetite/maghemite concentration, which ranges from superparamagnetic/single domain up to fine pseudo-single domain sizes. We use multiple environmental magnetic proxies, which measure pedogenic magnetite/maghemite concentration, to document that summer monsoon precipitation was low before ∼14.5 ka and high during the Bölling–Allerød warm period (14.5–12.8 ka), and shifted to low values at the onset of the Young Dryas cold period ∼12.4 ka, followed by a sustained long-term increasing trend from 12.4 to 6 ka. We relate these monsoon precipitation changes to the consistent Atlantic Meridional Overturning Circulation variability, which modulated North Hemisphere temperatures and displacements of Inter-Tropical Convergence Zone and Walker circulation over the Pacific Ocean. The observed large-amplitude deglacial Asian monsoon changes may have played a role in several key evolutionary changes in Asia implicated by the Yujiagou archeological evidence, including Paleolithic to Neolithic culture transition, Asian pottery development, and early human dispersals from Asia to America.

scholarly journals The Asian Summer Monsoon: Teleconnections and Forcing Mechanisms—A Review from Chinese Speleothem δ18O Records

Quaternary ◽  
2019 ◽  
Vol 2 (3) ◽  
pp. 26 ◽  
Author(s):  
Zhang ◽  
Brahim ◽  
Li ◽  
Zhao ◽  
Kathayat ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Temporal Distribution ◽  
The Holocene ◽  
North Atlantic Climate ◽  
Asian Summer ◽  
Spatio Temporal ◽  
Forcing Mechanisms ◽  
The Last Two Millennia ◽  
Global Population

Asian summer monsoon (ASM) variability significantly affects hydro-climate, and thus socio-economics, in the East Asian region, where nearly one-third of the global population resides. Over the last two decades, speleothem δ18O records from China have been utilized to reconstruct ASM variability and its underlying forcing mechanisms on orbital to seasonal timescales. Here, we use the Speleothem Isotopes Synthesis and Analysis database (SISAL_v1) to present an overview of hydro-climate variability related to the ASM during three periods: the late Pleistocene, the Holocene, and the last two millennia. We highlight the possible global teleconnections and forcing mechanisms of the ASM on different timescales. The longest composite stalagmite δ18O record over the past 640 kyr BP from the region demonstrates that ASM variability on orbital timescales is dominated by the 23 kyr precessional cycles, which are in phase with Northern Hemisphere summer insolation (NHSI). During the last glacial, millennial changes in the intensity of the ASM appear to be controlled by North Atlantic climate and oceanic feedbacks. During the Holocene, changes in ASM intensity were primarily controlled by NHSI. However, the spatio-temporal distribution of monsoon rain belts may vary with changes in ASM intensity on decadal to millennial timescales.

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