Late Holocene Indian Summer Monsoon Variations Recorded at Lake Erhai, Southwestern China

2015 ◽  
Vol 83 (2) ◽  
pp. 307-314 ◽  
Author(s):  
Hai Xu ◽  
Xinying Zhou ◽  
Jianghu Lan ◽  
Bin Liu ◽  
Enguo Sheng ◽  
...  
Keyword(s):  
Grain Size ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Late Holocene ◽  
Southwestern China ◽  
Sediment Grain Size ◽  
The Past ◽  
Pollen Concentrations ◽  
Lake Erhai ◽  
Elemental Contents

In this study we report changes in Indian summer monsoon (ISM) intensity during the past ~ 3500 yr inferred from proxy indices at Lake Erhai, southwestern China. Both the pollen concentrations and other proxy indices, including sediment grain size, total organic carbon contents (TOC), and elemental contents (e.g., Fe, Al), clearly indicate a long term decreasing trend in ISM intensity over the late Holocene. During the period from approximately AD 750 to AD 1200, pollen concentrations of conifer and broadleaf trees, and herbs reached the lowest levels over the past ~ 3500 yr; while the pollen percentages of both herbs and broadleaf trees increased, suggesting a significant medieval drought. The grain size, TOC, and elemental contents also support an arid climate during the medieval period. The Little Ice Age (LIA) at Lake Erhai was characterized as cold and wet. The medieval and LIA climatic patterns at Lake Erhai were similar to those over most of the ISM areas, but anti-phase with those over East Asian summer monsoon (EASM) areas. We suspect that sea surface temperature variations in the Indo-Pacific oceans and the related land-sea thermal contrasts may be responsible for such hydroclimatic differences between EASM and ISM areas.

Holocene Indian Summer Monsoon variations inferred from end-member modeling of sediment grain size in the Andaman Sea

2020 ◽  
Vol 558 ◽  
pp. 28-38 ◽  
Author(s):  
Yun Huang ◽  
Jule Xiao ◽  
Rong Xiang ◽  
Shengfa Liu ◽  
Somkiat Khokiattiwong ◽  
...  
Keyword(s):  
Grain Size ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Andaman Sea ◽  
Sediment Grain Size

East Asian winter monsoon variation during the last 3000 years as recorded in a subtropical mountain lake, northeastern Taiwan

The Holocene ◽  
2021 ◽  
pp. 095968362110190
Author(s):  
Tsai-Wen Lin ◽  
Stefanie Kaboth-Bahr ◽  
Kweku Afrifa Yamoah ◽  
André Bahr ◽  
George Burr ◽  
...  
Keyword(s):  
Grain Size ◽  
East Asian Winter Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
Mountain Lake ◽  
Sediment Grain Size ◽  
Global Monsoon ◽  
Asian Winter Monsoon ◽  
The Past ◽  
Monsoon System

The East Asian Winter Monsoon (EAWM) is a fundamental part of the global monsoon system that affects nearly one-quarter of the world’s population. Robust paleoclimate reconstructions in East Asia are complicated by multiple sources of precipitation. These sources, such as the EAWM and typhoons, need to be disentangled in order to understand the dominant source of precipitation influencing the past and current climate. Taiwan, situated within the subtropical East Asian monsoon system, provides a unique opportunity to study monsoon and typhoon variability through time. Here we combine sediment trap data with down-core records from Cueifong Lake in northeastern Taiwan to reconstruct monsoonal rainfall fluctuations over the past 3000 years. The monthly collected grain-size data indicate that a decrease in sediment grain size reflects the strength of the EAWM. End member modelling analysis (EMMA) on sediment core and trap data reveals two dominant grain-size end-members (EMs), with the coarse EM 2 representing a robust indicator of EAWM strength. The downcore variations of EM 2 show a gradual decrease over the past 3000 years indicating a gradual strengthening of the EAWM, in agreement with other published EAWM records. This enhanced late-Holocene EAWM can be linked to the expansion of sea-ice cover in the western Arctic Ocean caused by decreased summer insolation.

Sensitivity of altitudinal vegetation in southwest China to changes in the Indian summer monsoon during the past 68000 years

2020 ◽  
Vol 239 ◽  
pp. 106359 ◽  
Author(s):  
Xiao Zhang ◽  
Zhuo Zheng ◽  
Kangyou Huang ◽  
Xiaoqiang Yang ◽  
Liping Tian
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Southwest China ◽  
The Past

Changes in the Indian Summer Monsoon during the past 600 years: A high-resolution record from the Anshupa Lake, Upper Mahanadi Delta, Core Monsoon Zone of India

2021 ◽  
pp. 105048
Author(s):  
Chinmay Dash ◽  
Rajasekhariah Shankar ◽  
Pitambar Pati ◽  
Busnur Rachotappa Manjunatha ◽  
Rayees Ahmad Shah ◽  
...  
Keyword(s):  
High Resolution ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
The Past

scholarly journals Objective Definition of the Indian Summer Monsoon Onset*

2009 ◽  
Vol 22 (12) ◽  
pp. 3303-3316 ◽  
Author(s):  
Bin Wang ◽  
Qinghua Ding ◽  
P. V. Joseph
Keyword(s):  
Indian Ocean ◽  
Excellent Agreement ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Time Scale ◽  
Rainy Season ◽  
Arabian Sea ◽  
Monsoon Onset ◽  
Indian Peninsula ◽  
The Past

Abstract The onset of the Indian summer monsoon (ISM) over the southern tip of the Indian peninsula [also known as monsoon onset over Kerala (MOK)] has been considered the beginning of India’s rainy season. The Indian Meteorological Department (IMD) makes an official prediction of ISM onset every year using a subjective method. Based on an analysis of the past 60-yr (1948–2007) record, the authors show that the onset date can be objectively determined by the beginning of the sustained 850-hPa zonal wind averaged over the southern Arabian Sea (SAS) from 5° to 15°N, and from 40° to 80°E. The rapid establishment of a steady SAS westerly is in excellent agreement with the abrupt commencement of the rainy season over the southern tip of the Indian peninsula. In 90% of the years analyzed, this simple and objective index has excellent agreement with the onset dates that are subjectively defined by the IMD. There are only 3 yr of the past 60 yr during which the two onset dates differ by more than 10 days, and none of them perfectly reflects the MOK. A prominent onset precursor on the biweekly time scale is the westward extension of the convection center from the equatorial eastern Indian Ocean toward the southeast Arabian Sea. On the intraseasonal time scale, the onset tends to be led by northeastward propagation of an intraseasonal convective anomaly from the western equatorial Indian Ocean. The objective determination of the onset based on the SAS low-level westerly is a characteristic representation of the complex process of the ISM onset. Given its objectiveness and its representation of the large-scale circulation, the proposed new onset definition provides a useful metric for verifying numerical model performance in simulating and predicting the ISM onset and for studying predictability of interannual variations of the onset.

scholarly journals Reconstruction of Indian summer monsoon winds and precipitation over the past 10,000 years using equatorial pacific SST proxy records

2017 ◽  
Vol 32 (2) ◽  
pp. 195-216 ◽  
Author(s):  
Emily C. Gill ◽  
Balaji Rajagopalan ◽  
Peter H. Molnar ◽  
Yochanan Kushnir ◽  
Thomas M. Marchitto
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Equatorial Pacific ◽  
The Past ◽  
Proxy Records ◽  
Monsoon Winds
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