Volcanic ash in the Antarctic ice sheet and its possible climatic implications
Volcanic ash in the Antarctic ice sheet and its possible climatic implications
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DOI：
10.1016/0012-821x(71)90126-9
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发表时间：
1971-12
影响因子：
5.3
通讯作者：
A. Gow;T. Williamson
中科院分区：
文献类型：
--
作者：
A. Gow;T. Williamson
大约2000个单独的火山灰瀑布保存在南极洲的深层岩心中。大部分碎片由尘埃大小的玻璃颗粒组成，很可能是来自南极洲的火山来源，尽管南极洲以外的来源不能完全排除。在3万至16000年前，曾有一段持续的火山灰流入时期，同一岩心的同位素(古温度)数据表明，南极上空的大气在同一时间发生了显著的降温。这种降温趋势直到火山灰的沉积几乎停止时才结束，这表明可能存在因果关系，涉及南极平流层中火山尘埃的太阳耗尽效应。可以想象，在威斯康星州后期，南极洲火山灰的广泛喷发也可能在这一时期引发了全球范围的降温--有效地加剧了现有的冰川制度。
Approximately 2000 individual ash falls are preserved in deep cores from Antarctica. The bulk of the debris is composed of dust-sized particles of glass that can probably be attributed to volcanic sources in Antarctica, though sources outside Antarctica cannot be entirely discounted. A period of sustained infall of ash occurred during the interval 30 000 to 16 000 years ago, and isotopic (paleotemperature) data from the same cores indicate that a significant cooling of the atmosphere over Antarctica occurred at the same time. This cooling trend did not terminate until deposition of ash had virtually ceased, suggesting possibly a cause and effect relationship involving the solar-depleting effect of volcanic dust in the Antarctic stratosphere. It is conceivable that widespread eruption of volcanic ash in Antarctica during the latter part of the Wisconsin may also have triggered world-wide cooling during this period — effectively intensifying the existing glacial regime.