A rainy northern Atacama Desert during the last interglacial
A rainy northern Atacama Desert during the last interglacial
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DOI：
10.1029/2010gl045728
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发表时间：
2010-12-10
影响因子：
5.2
通讯作者：
Kuypers, Marcel M. M.
中科院分区：
文献类型：
--
作者：
Contreras, Sergio;Lange, Carina B.;Kuypers, Marcel M. M.
末次间冰期（[LIG];类似于125 kyr ago）期间，阿塔卡马沙漠北方延伸区和秘鲁上升流系统对气候条件的响应，利用秘鲁陆架沉积物中保存的海洋和陆地生物的分子化石进行了跟踪。ODP站点1229（过去145 kyr）的高分辨率记录表明，温暖和潮湿的条件（降雨和河流径流）沿海岸沿着发生在LIG，当全球温度与今天相当，甚至更高。地表沃茨升温约3摄氏度，水柱分层、降雨和河流径流增强，与初级生产力低下和赤道太平洋温度梯度下降约1.5摄氏度有关（即，弱步行者环流），表明在LIG期间热带太平洋的长期厄尔尼诺响应。相比之下，全新世晚期（[LH] last 3 kyr）的特征是地表沃茨较冷，出口和初级生产力较高，气候干燥。引文：Contreras，S.，C. B。兰格，S。潘托哈湾Lavik，D. Rincon-Martinez和M. M. M. Kuypers（2010），A rainy北方阿塔卡马沙漠在最后一次间冰期，地球物理学。保留信函：37，L23612，doi：10.1029/2010GL045728。
The response of the northern extension of the Atacama Desert and the Peruvian upwelling system to climate conditions during the Last Interglacial ([LIG]; similar to 125kyr ago) was tracked using molecular fossils of marine and terrestrial organisms preserved in Peruvian shelf sediments. High resolution records of ODP Site 1229 (past 145 kyr) indicated that warmer and wetter conditions (rainfall and river runoff) along the coast occurred during the LIG, when global temperatures were comparable or even higher than today. A similar to 3 degrees C warming of surface waters, enhanced water column stratification, rainfall and river runoff were associated with low primary productivity and a similar to 1.5 degrees C decrease in the temperature gradient across the Equatorial Pacific (i.e., weak Walker circulation), suggesting a prolonged El Nino-like response of the tropical Pacific during the LIG. In contrast, the late Holocene ([LH] last 3 kyr) was characterized by colder surface waters, higher export and primary productivity, and a drier climate. Citation: Contreras, S., C. B. Lange, S. Pantoja, G. Lavik, D. Rincon-Martinez, and M. M. M. Kuypers (2010), A rainy northern Atacama Desert during the last interglacial, Geophys. Res. Lett., 37, L23612, doi: 10.1029/2010GL045728.