The early Holocene optimum inferred from a high-resolution pollen record of Huguangyan Maar Lake in southern China

2007 ◽  
Vol 52 (20) ◽  
pp. 2829-2836 ◽  
Author(s):  
ShuYun Wang ◽  
HouYuan Lü ◽  
JiaQi Liu ◽  
Jörg F. W. Negendank
Keyword(s):  
High Resolution ◽  
Southern China ◽  
Early Holocene ◽  
Pollen Record ◽  
Maar Lake ◽  
Huguangyan Maar Lake

Vegetation and climate changes over the last 30 000 years on the Leizhou Peninsula, southern China, inferred from the pollen record of Huguangyan Maar Lake

Boreas ◽  
2017 ◽  
Vol 46 (3) ◽  
pp. 525-540 ◽  
Author(s):  
Yuting Meng ◽  
Weiming Wang ◽  
Jianfang Hu ◽  
Jixiao Zhang ◽  
Yangjun Lai
Keyword(s):  
Climate Changes ◽  
Southern China ◽  
Pollen Record ◽  
Leizhou Peninsula ◽  
Maar Lake ◽  
Vegetation And Climate ◽  
Huguangyan Maar Lake

A 20,000-year high-resolution pollen record from Huguangyan Maar Lake in tropical–subtropical South China

2017 ◽  
Vol 472 ◽  
pp. 83-92 ◽  
Author(s):  
Mei Sheng ◽  
Xisheng Wang ◽  
Shuqin Zhang ◽  
Guoqiang Chu ◽  
Youliang Su ◽  
...  
Keyword(s):  
High Resolution ◽  
South China ◽  
Pollen Record ◽  
Maar Lake ◽  
Huguangyan Maar Lake

High-resolution Geomagnetic Field Records Decipher the Possible Precession links since about 340-kyr in a maar lake sediment sequence in tropical Asia

2020 ◽  
Author(s):  
Xiaoqiang Yang ◽  
Cong Chen ◽  
Zhuo Zheng
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Geomagnetic Field ◽  
Southern China ◽  
Singular Spectrum Analysis ◽  
Luminescence Dating ◽  
Large Spatial Scale ◽  
The Earth ◽  
Earth Magnetic Field ◽  
Maar Lake

<p>A series of paleomagnetic works relying on the ocean sediments present some significant astronomic periods, such as a 100 kyr quasi-period and 41 kyr obliquity signal. These studies provide the new insights unscrambling what and how the earth magnetic field changed in despite of the ongoing debating. Numerical studies of recent years also reveal the possibility of the precession drive the dynamos and influence the magnetic field. However, the less of reliable high-resolution paleomagnetic records besides of relative paleointensity reduce its credibility. Here, we present some detailed rock magnetic and paleomagnetic studies on the continuous 40-m-thick sediments in two parallel cores retrieved from Tianyang Maar lake, southern China. The new results would contribute to discuss the correlation of paleomagnetic field with the astronomical factors.</p><p>Tianyang Maar lake  is located in the southern part of the Leizhou Peninsula.  The maar lake has a surface area of ~ 7.3 km<sup>2</sup> surrounded by a 40 - 60 m high crater rim composed of basaltic breccia and tuff . Two new parallel cores, TY08 and TY15 (~ 10 m apart), were extracted from center of the crater in 2008 and 2015, respectively, using a rotary borer consisting of a stainless steel outer tube and a plastic inner tube to minimize sediment disturbances and contamination. The sediments of two cores can divided into three zones: about upper 15.59 m was composed of varying colors clay and the middle part (15.59-21.94 m), was dominated by the grey and greyish-brown fine to coarse sand with occasional gravels, embedded a thick grey clay layer; the lower part (21.94-40.0 m) shown as the dark grey and black organic-rich clay.</p><p>The paleomagnetic results show that the natural remanent magnetization (NRM) of the sediments is mainly contributed by magnetically soft minerals, and the sediments have fairly documented geomagnetic field variations. A chronology is constructed using multiple methods, including radiocarbon dating, optically stimulated luminescence dating and terrestrial-marine pollen correlation. The 340-kyr paleomagnetic inclination record displays patterns similar to those seen in regional records over a large spatial scale (> 3000 km), implying that these records may reflect large-scale core dynamics on timescales of 10<sup>4 </sup>- 10<sup>5</sup> years in this low-latitude region. The Tianyang inclination record exhibits a negligible inclination anomaly (∆I = -0.08°) and features six anomalous inclination events, which are assigned to the Laschamp, Blake, Fram Strait II/6α, Iceland Basin, Mamaku and 9α excursions respectively. The spectral and singular spectrum analysis (SSA) exhibit that the inclination does not show the significant signal of 100-kyr periodicity, however, the closed precession period is obvious in the third components of inclination (PC3). PC3 component shows nearly synchronous variations with the precession parameter while the opposite correlation appeared under the condition of eccentricity minima strong. This corresponding pattern hint us that astronomical parameters have the essential influence to the earth magnetic field, however, the different moving may forc or constrain the earth magnetic behavior.</p>

scholarly journals A Holocene palaeomagnetic secular variation record from Huguangyan maar Lake, southern China

2012 ◽  
Vol 190 (1) ◽  
pp. 188-200 ◽  
Author(s):  
Xiaoqiang Yang ◽  
Qingsong Liu ◽  
Zongqi Duan ◽  
Zhihua Su ◽  
Gangjian Wei ◽  
...  
Keyword(s):  
Secular Variation ◽  
Southern China ◽  
Maar Lake ◽  
Huguangyan Maar Lake

High-resolution evidence from southern China of an early holocene optimum and a mid-Holocene dry event during the Past 18,000 Years

2004 ◽  
Vol 62 (1) ◽  
pp. 39-48 ◽  
Author(s):  
Weijian Zhou ◽  
Xuefeng Yu ◽  
A.J. Timothy Jull ◽  
G. Burr ◽  
J.Y. Xiao ◽  
...  
Keyword(s):  
High Resolution ◽  
Southern China ◽  
Asian Summer Monsoon ◽  
Early Holocene ◽  
Central China ◽  
Pressure System ◽  
Southern Boundary ◽  
Subtropical Zone ◽  
The Holocene ◽  
The Past

Computer models suggest that the Holocene Optimum for East Asian summer monsoon precipitation occurred at different times in different regions of China. Previous studies indicate that this time-transgressive Holocene Optimum should have been experienced about 3000 yr ago in southern China. In this study we describe a section which allows us to test this timing directly. We have closely examined high-resolution eutrophic peat/mud sequences covering the past 18,000 cal yr at Dahu, Jiangxi, on the southern boundary of the mid subtropical zone in China. Late Pleistocene successions in the Dahu record indicate cooler and much wetter conditions relative to synchronous events in north-central China. Our results indicate that the Holocene Optimum occurred between ca. 10,000 and 6000 cal yr ago in southern China, consistent with the global pattern. Conditions were relatively dry and cold from 6000 to 4000 cal yr ago. Our data also support the conclusion that the last deglaciation to early Holocene in the south was much wetter, resulting in the formation of dense broad-leaved forests, which could have acted to moderate land temperature ∼10,000 to 6000 cal yr ago, yielding a stable early-Holocene climate. After 6000 cal yr, forest reduction led to unstable land temperatures, and possibly to a northerly shift of the subtropical high-pressure system. Whatever the mechanism, these changes resulted in decreased precipitation between 6000 and 4000 cal yr B.P. in southern China.

scholarly journals Corrigendum to “High-resolution evidence from southern China of an early Holocene optimum and a mid-Holocene dry event during the past 18,000 years” [Quaternary Research 62 (2004) 39–48]

2008 ◽  
Vol 70 (1) ◽  
pp. 129-130 ◽  
Author(s):  
Weijian Zhou ◽  
Xuefeng Yu ◽  
A.J. Timothy Jull ◽  
G. Burr ◽  
J.Y. Xiao ◽  
...  
Keyword(s):  
High Resolution ◽  
Southern China ◽  
Early Holocene ◽  
The Past
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