Variation in the Asian monsoon intensity and dry-wet conditions since the Little Ice Age in central China revealed by an aragonite stalagmite

J.-J. Yin; D.-X. Yuan; H.-C. Li; H. Cheng; T.-Y. Li; R. L. Edwards; Y.-S. Lin; J.-M. Qin; W. Tang; Z.-Y. Zhao; H.-S. Mii

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Variation in the Asian monsoon intensity and dry-wet conditions since the Little Ice Age in central China revealed by an aragonite stalagmite

机译：自中国中部小冰期以来亚洲季风强度和干湿条件的变化由文石石笋揭示

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This paper focuses on the climate variability in central China since AD 1300, involving: (1) a well-dated, 1.5-year resolution stalagmite δ~(18)O record from Lianhua Cave, central China (2) links of the δ~(18)O record with regional dry-wet conditions, monsoon intensity, and temperature over eastern China (3) correlations among drought events in the Lianhua record, solar irradiation, and ENSO (El Nino-Southern Oscillation) variation. We present a highly precise, ~(230)Th / U-dated, 1.5-year resolution δ~(18)O record of an aragonite stalagmite (LHD1) collected from Lianhua Cave in the Wuling Mountain area of central China. The comparison of the δ~(18)O record with the local instrumental record and historical documents indicates that (1) the stalagmite δ~(18)O record reveals variations in the summer monsoon intensity and dry-wet conditions in the Wuling Mountain area. (2) A stronger East Asian summer monsoon (EASM) enhances the tropical monsoon trough controlled by ITCZ (Intertropical Convergence Zone), which produces higher spring quarter rainfall and isotopically light monsoonal moisture in the central China. (3) The summer quarter/spring quarter rainfall ratio in central China can be a potential indicator of the EASM strength: a lower ratio corresponds to stronger EASM and higher spring rainfall. The ratio changed from ＜ 1 to ＞ 1 after 1950, reflecting that the summer quarter rainfall of the study area became dominant under stronger influence of the Northwestern Pacific High. Eastern China temperatures varied with the solar activity, showing higher temperatures under stronger solar irradiation, which produced stronger summer monsoons. During Maunder, Dalton and 1900 sunspot minima, more severe drought events occurred, indicating a weakening of the summer monsoon when solar activity decreased on decadal timescales. On an interannual timescale, dry conditions in the study area prevailed under El Nino conditions, which is also supported by the spectrum analysis. Hence, our record illustrates the linkage of Asian summer monsoon precipitation to solar irradiation and ENSO: wetter conditions in the study area under stronger summer monsoon during warm periods, and vice versa. During cold periods, the Walker Circulation will shift toward the central Pacific under El Nino conditions, resulting in a further weakening of Asian summer monsoons.

机译：本文着重研究自公元1300年以来中国中部的气候变异性，包括：（1）来自中国中部莲花洞的具有良好历史，为期1.5年的石笋δ〜（18）O记录（2）δ〜的联系（18）O记录，与中国东部地区的干湿条件，季风强度和温度有关。（3）莲花记录中的干旱事件，太阳辐射和ENSO（厄尔尼诺-南方涛动）变化之间的相关性。我们提供了从中国中部武陵山区莲花洞收集的文石石笋（LHD1）的〜（230）Th / U年代，1.5年的高分辨率δ〜（18）O记录。 δ〜（18）O记录与当地仪器记录和历史文献的比较表明：（1）石笋δ〜（18）O记录揭示了雾灵山地区夏季风强度和干湿条件的变化。（2）较强的东亚夏季风（EASM）增强了由ITCZ（热带辐合带）控制的热带季风槽，该地区在中国中部产生较高的春季季降水和同位素轻的季风湿度。（3）中国中部的夏季季/春季季降雨比率可能是EASM强度的潜在指标：较低的比率对应于更强的EASM和较高的春季降雨。 1950年后，该比率从＜1变为＞＞ 1，这反映了在西北太平洋高压的强烈影响下，研究区的夏季季降雨成为主导。中国东部的温度随太阳活动而变化，在较强的太阳辐射下显示较高的温度，从而产生较强的夏季风。在Maunder，Dalton和1900年的太阳黑子极小期间，发生了更严重的干旱事件，这表明夏季风减弱了，当时太阳活动以十年的时间尺度下降。在每年的时间尺度上，研究区域的干旱条件主要发生在厄尔尼诺现象下，这也得到了频谱分析的支持。因此，我们的记录说明了亚洲夏季风降水与太阳辐射和ENSO的联系：研究区在温暖的夏季风下在温暖的夏季雨季处于较湿的条件，反之亦然。在寒冷时期，沃克环流将在厄尔尼诺现象条件下向太平洋中部转移，导致亚洲夏季风进一步减弱。

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《Climate of the past》 |2014年第5期|1803-1816|共14页
作者
J.-J. Yin; D.-X. Yuan; H.-C. Li; H. Cheng; T.-Y. Li; R. L. Edwards; Y.-S. Lin; J.-M. Qin; W. Tang; Z.-Y. Zhao; H.-S. Mii;
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Key Laboratory of Karst Dynamics, MLR and Guangxi, Guilin, Guangxi 541004, China,School of Geographical Sciences, Southwest University, Chongqing 400715, China,Institute of Karst Geology, CAGS, Guilin, Guangxi 541004, China;

Key Laboratory of Karst Dynamics, MLR and Guangxi, Guilin, Guangxi 541004, China,School of Geographical Sciences, Southwest University, Chongqing 400715, China,Institute of Karst Geology, CAGS, Guilin, Guangxi 541004, China;

Key Laboratory of Karst Dynamics, MLR and Guangxi, Guilin, Guangxi 541004, China,Institute of Karst Geology, CAGS, Guilin, Guangxi 541004, China,Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan;

Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China,Department of Earth Sciences, University of Minnesota, Minneapolis 55455, USA;

School of Geographical Sciences, Southwest University, Chongqing 400715, China;

Department of Earth Sciences, University of Minnesota, Minneapolis 55455, USA;

Key Laboratory of Karst Dynamics, MLR and Guangxi, Guilin, Guangxi 541004, China,Institute of Karst Geology, CAGS, Guilin, Guangxi 541004, China;

Key Laboratory of Karst Dynamics, MLR and Guangxi, Guilin, Guangxi 541004, China,Institute of Karst Geology, CAGS, Guilin, Guangxi 541004, China;

Institute of Karst Geology, CAGS, Guilin, Guangxi 541004, China;

School of Geographical Sciences, Southwest University, Chongqing 400715, China,Department of Environmental and Resource Sciences, LiuPanShui Normal University, Liupanshui 553004, China;

Department of Earth Sciences, National Taiwan Normal University, Taipei 11677, Taiwan;

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Variation in the Asian monsoon intensity and dry-wet conditions since the Little Ice Age in central China revealed by an aragonite stalagmite

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