Massive deposition of Sahelian dust on the Canary Island Lanzarote during North Atlantic Heinrich Events

Massive deposition of Sahelian dust on the Canary Island Lanzarote during North Atlantic Heinrich Events
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北大西洋海因里希事件期间,萨赫勒沙尘大量沉积在加那利群岛兰萨罗特岛

DOI:
10.1017/qua.2020.100
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发表时间:
2021
影响因子:
2.3
通讯作者:
Roettig
Roettig
中科院分区:
地球科学3区
文献类型:
--
作者:
Heinrich;Schmidt;Ziemen;Mikolajewicz;Roettig

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Muñique(兰萨罗特岛)附近的风成岩的新IRSL年龄表明,在末次冰期循环期间,加那利群岛上的沉积动力学千年尺度的气候变化的影响。这些阶段间和阶段性气候条件的重复演替形成了多个风成沉积序列,每个序列通常包括三种沉积类型。DepoType 1和DepoType 2主要由海洋生物成因的碳酸盐碎屑组成,少量来自撒哈拉沙漠的灰尘代表了interstadial条件。与DepoType 1相比,DepoType 2的特征在于更大量的陆地蜗牛和钙化的育雏细胞。一个DepoType 3富含非洲亚热带/热带红壤的灰尘终止了一个序列。对DepoType 3型矿床的IRSL测年结果清楚地表明,这些矿床是在海恩里希事件期间在Stadial条件下沉积的。北大西洋的stadial冷却导致气候带的南移,在海因里希事件期间达到高潮,当时北极气候达到最南端。因此,大气变化导致来自当时干旱的萨赫勒的大量灰尘供应。从干燥的DepoTypes 1到更潮湿的DepoTypes 3,灰尘和降水的增加源于千年周期期间修改的大气动力学。
New IRSL ages of eolianites close to Muñique (Lanzarote) demonstrate the influence of millennial scale climatic variability on the sedimentary dynamics on the Canary Islands during the last glacial cycle. The repetitive succession of interstadial and stadial climatic conditions formed multiple sequences of eolian deposits, each in general comprising three depositional types. DepoType 1 and DepoType 2 consist mainly of marine biogenic carbonate detritus with small amounts of dust from the Sahara representing interstadial conditions. DepoType 2 compared to DepoType 1 is characterized by larger amounts of land snails and calcified brood cells. A DepoType 3 rich in dust from African subtropical/tropical Latisols terminates a sequence. IRSL dating on DepoType 3 type deposits clearly shows that these were deposited during Heinrich Events under stadial conditions. The stadial cooling of the North Atlantic Ocean caused a southern shift of climate zones that culminated during Heinrich Events when the arctic climate reaches its most southerly extent. As a consequence, atmospheric changes led to massive dust supply from the then-dry Sahel. The increase in dust and precipitation from the dry DepoTypes 1 to the more humid DepoTypes 3 originates from a modified atmospheric dynamic during a millennial cycle.
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