Finding Dry Spells in Ocean Sediments

Gallagher Stephen J.; deMenocal Peter B.

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Finding Dry Spells in Ocean Sediments

机译：在海洋沉积物中寻找干法术

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Ocean basins are the ultimate repositories of sediment. Their slow, continuous accumulation over geologic history provides valuable archives that document major climate events and transitions in Earth history. Mineral dust plumes borne by prevailing winds are dominant sources of terrigenous sedimentation off regions such as the Saharan, Arabian, Kalahari, Patagonian, and Australian deserts. Scientific ocean drilling off Africa and Arabia has recorded consistent glacial-stage increases in eolian dust fluxes throughout the Pliocene-Pleistocene, where elevated dust flux values during glacial periods and stadia have been interpreted as reflecting real hydroclimate progression toward greater glacial aridity. International Ocean Discovery Program Expeditions 356, 363, and 369 (conducted in 2015, 2016, and 2017, respectively) recovered extensive sedimentary climate archives off Australia. Ongoing analyses of these strata reveal a marine record of the onset of continental aridity as Australia migrated northward by 25 over the last 50 million years. These Southern Hemisphere oceanic records will continue to yield key information on global climate evolution, allowing us to understand how deserts and monsoonal systems have evolved through time.

机译：海洋盆地是沉积物的终极储存库。它们在地质历史上缓慢而连续的积累提供了有价值的档案，这些档案记录了地球历史上的主要气候事件和转变。盛行风传播的矿物粉尘羽是撒哈拉沙漠，阿拉伯，卡拉哈里，巴塔哥尼亚和澳大利亚沙漠等地区陆源性沉积的主要来源。在非洲和阿拉伯海域进行的科学海洋钻探表明，整个上新世-更新世以来风沙尘埃通量一直在冰川阶段增加，那里的冰川期和静息期尘埃通量值升高被解释为反映了真正的水文气候向更大的冰川干旱发展。国际海洋发现计划远征队356、363和369（分别于2015年，2016年和2017年进行）在澳大利亚以外的地方恢复了广泛的沉积气候档案。对这些地层的持续分析显示，在过去的五千万年中，澳大利亚向北迁移了25个，就开始了大陆干旱的海洋记录。这些南半球的海洋记录将继续提供有关全球气候演变的关键信息，使我们能够了解沙漠和季风系统是如何随着时间演变的。

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《Oceanography》 |2019年第1期|60-63|共4页
作者
Gallagher Stephen J.; deMenocal Peter B.;
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Univ Melbourne, Sch Earth Sci, Melbourne, Vic, Australia;

Columbia Univ, Dept Earth & Environm Sci, New York, NY USA;

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Finding Dry Spells in Ocean Sediments

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