The wet Little Ice Age recorded by sediments in Huguangyan Lake, tropical South China
The wet Little Ice Age recorded by sediments in Huguangyan Lake, tropical South China
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华南热带湖光岩湖沉积物记录的湿润小冰期
DOI：
10.1016/j.quaint.2011.12.022
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发表时间：
2012-06
影响因子：
2.2
通讯作者：
中科院分区：
文献类型：
--
作者：
尽管在小冰期(LIA)期间，全球许多地区的气温都出现了类似的下降趋势，但重建的湿度在不同地区之间存在显著差异。与热带南部中国地区的气温历史相比，LIA期间的降水历史知之甚少。在本研究中，在热带南部中国的湖光堰湖中部发现了一个长度为117.5厘米的沉积物岩芯。为了研究LIA期间区域降水的变化，每隔约1 cm对总有机碳(TOC)、总氮(TN)、无机碳(IC)和非残留锶(Sr)进行分析。总体上，含锶矿物对化学风化较为敏感，而热带南部中国地区以降水为主。因此，湖光岩沉积物中的非残留锶可以作为降水变化的指示指标，这一点也从湖光岩沉积物中TOC、TN和IC的下部变化中得到了验证。沉积物剖面中非残留锶与TOC、TN呈正相关，与IC呈负相关。TOC、TN、IC和非残留锶在公元1500-1750年间共同显示了一个湿润时期，与LIA相对应。巧合的是，太阳总辐照度(TSI)和北半球温度都是过去1000年来公元1500至1750年间的最低值。因此，热带南部中国地区的湿润大气环流很可能是由太阳低辐射引起的。LIA期间，低太阳辐射可能导致北半球气温降低，减弱了东亚夏季风的强度，同时使亚洲夏季风北缘南移，导致热带南部中国降水增多。
Although temperature decreased in a similar trend in many regions around the word during the Little Ice Age (LIA), the reconstructed humidity is remarkably different from region to region. The precipitation history during the LIA is poorly understood as compared to the temperature history in tropical South China. In this study, a sediment core with a length of 117.5 cm was recovered in the central part of Huguangyan Lake in tropical South China. Total organic carbon (TOC), total nitrogen (TN), inorganic carbon (IC) and non-residual strontium (Sr) were analyzed at approximately 1 cm intervals to study the regional precipitation changes during the LIA. Generally, Sr-containing minerals are sensitive to chemical weathering which is dominated by the precipitation in tropical South China. Thus the non-residual Sr in Huguangyan sediments can be used as an indicator of precipitation changes, which is also verified by the downcore variations of TOC, TN and IC in Huguangyan Lake. The non-residual Sr correlated positively with TOC and TN but negatively with IC in the sediment profile. TOC, TN, IC and the non-residual Sr jointly demonstrated a wet period from AD 1500 to 1750, which corresponds to the LIA. Coincidently, both the total solar irradiance (TSI) and Northern Hemisphere temperature have the lowest values between AD 1500 and 1750 over the past millennium. Therefore, the wet LIA in tropical South China was most likely caused by the low solar irradiation. During the LIA, the low solar irradiation likely resulted in the decrease of the Northern Hemisphere temperature, which weakened the intensity of the East Asian summer monsoon (EASM) and synchronously moved the north edge of the Asian summer monsoon southward, leading to an increase in the precipitation in tropical South China.
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DOI：
10.1191/0959683605hl863rr
发表时间：
2005-09
期刊：
The Holocene
影响因子：
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作者：
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通讯作者：
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影响因子：
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DOI：
10.1016/j.palaeo.2005.09.017
发表时间：
2006-05
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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