A 1000-Year Carbon Isotope Rainfall Proxy Record from South African Baobab Trees (Adansonia digitata L.).
A 1000-Year Carbon Isotope Rainfall Proxy Record from South African Baobab Trees (Adansonia digitata L.).
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来自南非baobab树（Adansonia digitata L.）的1000年碳同位素降雨代理记录。
DOI：
10.1371/journal.pone.0124202
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Hofmeyr M
中科院分区：
文献类型：
--
作者：
Woodborne S;Hall G;Robertson I;Patrut A;Rouault M;Loader NJ;Hofmeyr M
基于碳同位素分析的四个猴面包树（猴面包树L.）树显示了过去1,000年来百年和十年尺度的变化。该记录与津巴布韦200年的树木年轮记录非常一致，表明南非夏季和冬季降雨区之间存在降雨偶极子。最潮湿的时期是C。公元1075年是中世纪的温暖时期，最干旱的时期是公元1075年。公元1635年，c.公元1695年和C。公元1805年，小冰河时期。年代际尺度的变化表明，降水强迫机制是一个复杂的近端和远端因素之间的相互作用。降雨量较高的时期与厄古拉斯海流核心区域的海面温度较低和印度洋的负偶极子矩指数密切相关。降雨量与厄尔尼诺/南方涛动指数之间的相关性是非静态的。在大多数记录中，潮湿的条件主要与厄尔尼诺条件有关，但自公元1970年以来，这种关系发生了逆转，潮湿的条件目前与拉尼娜条件有关。近端和远端海洋影响的影响不足以解释中世纪温暖期和小冰期之间的降雨制度转变，证据表明，这是一个北移的副热带西风带，而不是南移的热带辐合带的结果。
A proxy rainfall record for northeastern South Africa based on carbon isotope analysis of four baobab (Adansonia digitata L.) trees shows centennial and decadal scale variability over the last 1,000 years. The record is in good agreement with a 200-year tree ring record from Zimbabwe, and it indicates the existence of a rainfall dipole between the summer and winter rainfall areas of South Africa. The wettest period was c. AD 1075 in the Medieval Warm Period, and the driest periods were c. AD 1635, c. AD 1695 and c. AD1805 during the Little Ice Age. Decadal-scale variability suggests that the rainfall forcing mechanisms are a complex interaction between proximal and distal factors. Periods of higher rainfall are significantly associated with lower sea-surface temperatures in the Agulhas Current core region and a negative Dipole Moment Index in the Indian Ocean. The correlation between rainfall and the El Niño/Southern Oscillation Index is non-static. Wetter conditions are associated with predominantly El Niño conditions over most of the record, but since about AD 1970 this relationship inverted and wet conditions are currently associated with la Nina conditions. The effect of both proximal and distal oceanic influences are insufficient to explain the rainfall regime shift between the Medieval Warm Period and the Little Ice Age, and the evidence suggests that this was the result of a northward shift of the subtropical westerlies rather than a southward shift of the Intertropical Convergence Zone.
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DOI：
10.1073/pnas.1003719108
发表时间：
2011-05-24
影响因子：
11.1
作者：
Bird, Broxton W.;Abbott, Mark B.;Rosenmeier, Michael F.
通讯作者：
Rosenmeier, Michael F.
影响因子：
5.2
作者：
Broccoli, AJ;Dahl, KA;Stouffer, RJ
通讯作者：
Stouffer, RJ
影响因子：
8.3
作者：
Hogg, Alan G.;Hua, Quan;Zimmerman, Susan R. H.
通讯作者：
Zimmerman, Susan R. H.
影响因子：
64.8
作者：
DUNWIDDIE, PW;LAMARCHE, VC
通讯作者：
LAMARCHE, VC
影响因子：
30.7
作者：
Li, Jinbao;Xie, Shang-Ping;Zheng, Xiao-Tong
通讯作者：
Zheng, Xiao-Tong