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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >A multi-proxy stalagmite record from northwestern Namibia of regional drying with increasing global-scale warmth over the last 47 kyr: The interplay of a globally shifting ITCZ with regional currents, winds, and rainfall
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A multi-proxy stalagmite record from northwestern Namibia of regional drying with increasing global-scale warmth over the last 47 kyr: The interplay of a globally shifting ITCZ with regional currents, winds, and rainfall

机译：纳米比亚西北部地区干旱的多代理石笋记录，过去47年以来全球范围内变暖趋势不断增加：全球转移的ITCZ与区域潮流，风和降雨的相互作用

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摘要

Stalagmite Orum-1 from a cave near Orumana in northwestern Namibia provides a multi-proxy record of regional drying with increasing global-scale warmth over the last 47 kyr, in a region with few long well-dated location specific paleoclimate records. Data from Stalagmite Orum-1 include carbon and oxygen stable isotope ratios, proportions of aragonite and calcite, pronouncedly differing petrographic fabrics, positions of layer-bounding surfaces, variation in layer-specific width, and changes in layer thickness, all of which combine to support change from wetter to drier conditions. Combined with fourteen U-Th ages, they suggest that climate was wetter in northwestern Namibia during globally cold MIS 3 than it is today, and with more grass than is present today. The climate at Orumana became drier during the deglacial transition after the Last Glacial Maximum, but carbon isotope data indicate that C-4 grasses persisted. In the Holocene, even greater aridity led to a reduction in grass cover and to the present C-3-dominated vegetation. Hiatuses in Stalagmite Orum-1 suggest even drier conditions during the Bolling-Allerod and during the early Holocene thermal maximum.
机译：来自纳米比亚西北部Orumana附近一个山洞的石笋Orum-1提供了区域干燥的多记录，在过去47年中，该地区的干旱在全球范围内一直存在，长期记录的位置没有特定的古气候记录。来自石笋Orum-1的数据包括碳和氧稳定同位素比率，文石和方解石的比例，岩相织物的显着不同，层边界表面的位置，层比宽度的变化以及层厚度的变化，所有这些都综合在一起，支持从潮湿到干燥的变化。结合14个U-Th年龄，他们表明，在纳米比亚MIS 3低温期间，纳米比亚西北部的气候比今天湿润，并且草皮比今天多。在末次冰期最大值之后的冰川期过渡期间，奥鲁马纳（Orumana）的气候变得更干燥，但碳同位素数据表明C-4草持续存在。在全新世中，更大的干旱导致草木覆盖面积的减少和目前C-3为主的植被。石笋Orum-1中的裂片表明，在Bolling-Allerod和全新世早期的热最大值期间，天气更干燥。

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