Timing and structure of Termination II in north China constrained by a precisely dated stalagmite record
Timing and structure of Termination II in north China constrained by a precisely dated stalagmite record
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受精确年代石笋记录限制的华北第二次终结的时间和结构
DOI：
10.1016/j.epsl.2019.01.043
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发表时间：
2019-04
影响因子：
5.3
通讯作者：
Edwards R. Lawrence
中科院分区：
文献类型：
--
作者：
Duan Wuhui;Cheng Hai;Tan Ming;Li Xianglei;Edwards R. Lawrence
由于高质量记录的数量不足，终止II（T-II）的时间和结构仍然存在争议。本文报道了133.4±0.3 ~ 126.6± 0.3kaBP（覆盖T-II大部分地区）中国北方地区石笋δ 18 O的精确定年数据。末次间冰期的起始时间为129.4± 0.3kaBP，与中国南方洞穴沉积记录一致，进一步支持了北方半球夏季日照在冰川终止中起重要作用的观点。在这一突变之前观测到一个延长的δ 18 O重区间，在中国南方洞穴记录中称为“弱季风区间”（Weak Monsoon Interval，简称WST），它与北大西洋Heinrich Stadial 11（H11）相关联。在最弱的阶段之前，在132.7±0.3 ka BP处发现了一个重要的千年尺度的级间峰。在中国南方一些洞穴沉积物和北大西洋烯酮Mg/Ca SST记录中也发现了同步对应。推测H11主要的淡水渗透可能发生在131.5kaBP之后，而134 ~ 131.5kaBP的海洋和大气环流仍处于阶段间模式。末次间冰期后，我国δ 18 O记录出现了一个千年尺度的“停顿”，与中国南方洞穴记录中δ 18 O下降速率的“减缓”同步。这可能是一个大的区域气候振荡，因为它也在北大西洋的一些记录中被识别出来，但它太弱了，不可能是新仙女木（YD）型事件。总之，与中国南方洞穴记录相比，在末次间冰期同步开始前后，显著的千年尺度气候振荡是我们记录的主要特征。尽管如此，这些气候事件的序列仍然与终止I（TI）有很大的不同，这可能归因于T-II期间比TI期间更强的日照、更高的大气CO2以及由此产生的更快更大的融水脉冲到北大西洋。
The timing and structure of Termination II (T-II) is still debatable as the number of high-quality records is insufficient. This study presents precisely dated stalagmite δ 18 O data between 133.4±0.3 to 126.6±0.3 ka BP (covering most of T-II) from north China, near the northern limit of the East Asian summer monsoon (EASM), an area sensitive to climate change. The onset of the last interglacial is constrained at 129.4±0.3 ka BP, consistent with south Chinese speleothem records, further supporting the idea that Northern Hemisphere summer insolation plays an important role in initiating glacial terminations. An extended interval of heavy δ 18 O is observed immediately prior to this abrupt transition, named as the “Weak Monsoon Interval”(WMI) in south Chinese cave records, which was associated with the Heinrich Stadial 11 (H11) in the North Atlantic. A significant millennial-scale interstadial peaking at 132.7±0.3 ka BP is identified preceding the weakest phase of the WMI. A synchronous counterpart is also found in some south Chinese speleothem and North Atlantic alkenone Mg/Ca SST records. It is inferred that the main H11 freshwater penetration possibly occurred after 131.5 ka BP, leaving some aspects of ocean and atmospheric circulation still in interstadial mode from 134 to 131.5 ka BP. Following the onset of the last interglacial, there was a millennial-scale “pause” in our δ 18 O record, synchronized with a “slowdown” in the rate of decrease in δ 18 O in south Chinese cave records. This is possibly a large regional climate oscillation, as it is also identified in some North Atlantic records, but one which is too weak to be a Younger Dryas (YD)-type event. In summary, compared to south Chinese cave records, significant millennial-scale climate oscillations before and after the synchronous onset of the last interglacial is the main feature of our record. Nevertheless, the sequence of these climate events remains very different from Termination I (TI), which is possibly ascribed to the stronger insolation, higher atmosphere CO 2, and the resultant faster and greater meltwater pulse to the North Atlantic during T-II than during TI.
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影响因子：
--
作者：
J. Toggweiler;J. Russell;S. Carson;S. Carson
通讯作者：
J. Toggweiler;J. Russell;S. Carson;S. Carson
影响因子：
5.2
作者：
J. Shakun;S. Burns;P. Clark;Hai Cheng;R. Edwards
通讯作者：
J. Shakun;S. Burns;P. Clark;Hai Cheng;R. Edwards
影响因子：
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作者：
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通讯作者：
Carlson, Anders E.
DOI：
10.1016/s1571-0866(07)80056-x
发表时间：
2007
期刊：
Developments in Quaternary Science
影响因子：
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作者：
C. Spötl;S. Holzkämper;A. Mangini
通讯作者：
C. Spötl;S. Holzkämper;A. Mangini
影响因子：
4
作者：
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通讯作者：
Nil Irvalı;U. Ninnemann;H. F. Kleiven;E. Galaasen;Audrey Morley;Y. Rosenthal