Precession-band variance missing from East Asian monsoon runoff.

Precession-band variance missing from East Asian monsoon runoff.
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东亚季风径流缺少进动带方差

DOI:
10.1038/s41467-018-05814-0
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发表时间:
2018-08-22
影响因子:
16.6
通讯作者:
Fox-Kemper B
Fox-Kemper B
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Clemens SC;Holbourn A;Kubota Y;Lee KE;Liu Z;Chen G;Nelson A;Fox-Kemper B

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洞穴沉积物CaCO3 δ18O是一种常用的古季风代用指标。然而,由于水源水δ 18 O的变化、温度的影响以及水汽输送路径上的降雨,从洞穴沉积物δ 18 O推断当地降雨量可能会变得复杂,本文利用长江流域(YRV)近海的浮游有孔虫CaCO3的δ 18 O来解决这些复杂性。其优点是,全球海水δ 18 O和当地温度变化的影响可以定量地消除,产生当地海水δ 18 O的记录,这是一个主要对当地降水和径流稀释反应的代理。YRV洞穴沉积物δ 18 O主要由岁差带(23 ky)周期性所控制,而当地海水δ 18 O主要由离心率(100 ky)和离心率(41 ky)周期性所控制,几乎没有岁差尺度的变化。这些结果与YRV以外的记录一致,表明东亚季风降雨对温室气体和高纬度冰盖强迫比直接日照强迫更敏感。晚更新世东亚季风变化的内在机制尚不清楚。在这里,作者提出了一个记录,当地的降水和径流从东链海,这表明强烈的敏感性温室气体和高纬度冰盖强迫。
Speleothem CaCO3 δ18O is a commonly employed paleomonsoon proxy. However, inferring local rainfall amount from speleothem δ18O can be complicated due to changing source water δ18O, temperature effects, and rainout over the moisture transport path. These complications are addressed using δ18O of planktonic foraminiferal CaCO3, offshore from the Yangtze River Valley (YRV). The advantage is that the effects of global seawater δ18O and local temperature changes can be quantitatively removed, yielding a record of local seawater δ18O, a proxy that responds primarily to dilution by local precipitation and runoff. Whereas YRV speleothem δ18O is dominated by precession-band (23 ky) cyclicity, local seawater δ18O is dominated by eccentricity (100 ky) and obliquity (41 ky) cycles, with almost no precession-scale variance. These results, consistent with records outside the YRV, suggest that East Asian monsoon rainfall is more sensitive to greenhouse gas and high-latitude ice sheet forcing than to direct insolation forcing. The underlying mechanisms driving the variability of the East Asia Monsoon during the late Pleistocene remain unclear. Here, the authors present a record of local precipitation and runoff from the East Chain Sea, which indicates strong sensitivity to greenhouse gases and high latitude ice sheet forcing.
DOI: 10.1038/s41467-018-05814-0
发表时间: 2018-08-22
影响因子: 16.6
作者:
Clemens SC;Holbourn A;Kubota Y;Lee KE;Liu Z;Chen G;Nelson A;Fox-Kemper B
通讯作者: Fox-Kemper B
DOI: 10.1016/j.epsl.2017.11.026
发表时间: 2018-01-15
影响因子: 5.3
作者:
Gray, William R.;Weldeab, Syee;Fischer, Gerhard
通讯作者: Fischer, Gerhard
DOI: 10.1016/j.quascirev.2014.11.009
发表时间: 2015-01-15
影响因子: 4
作者:
Chiang, John C. H.;Fung, Inez Y.;Labrousse, Clothilde A.
通讯作者: Labrousse, Clothilde A.
DOI: 10.1038/ncomms6371
发表时间: 2014-11-01
影响因子: 16.6
作者:
Caley, Thibaut;Roche, Didier M.;Renssen, Hans
通讯作者: Renssen, Hans
DOI: 10.5670/oceanog.2015.84
发表时间: 2015-12-01
期刊: OCEANOGRAPHY
影响因子: 2.8
作者:
Andres, Magdalena;Jan, Sen;Book, Jeffrey W.
通讯作者: Book, Jeffrey W.