20th-Century doubling in dust archived in an Antarctic Peninsula ice core parallels climate change and desertification in South America
20th-Century doubling in dust archived in an Antarctic Peninsula ice core parallels climate change and desertification in South America
复制标题
DOI：
10.1073/pnas.0607657104
复制
发表时间：
2007-04-03
影响因子：
11.1
通讯作者：
Simoes, Jefferson C.
中科院分区：
文献类型：
--
作者：
McConnell, Joseph R.;Aristarain, Alberto J.;Simoes, Jefferson C.
大气中的地壳尘埃通过改变辐射预算并影响云成核和光学特性来直接影响地球的辐射强迫，并通过海洋肥化间接影响地球的辐射强迫，从而改变碳封存。在过去冰期到间冰期转变的冰芯研究中，大气中灰尘的增加与全球气温下降有关。我们提供了近几个世纪以来南极半岛北部（南半球变暖最快的地区）铝沉积的连续冰芯记录；以前没有报道过这样的记录。该记录显示，20 世纪期间，铝硅酸盐尘埃沉积量增加了一倍以上，与南半球变暖约 1 摄氏度同时发生：这种模式与巴塔哥尼亚和阿根廷北部的气温升高、相对湿度降低以及广泛的荒漠化同时发生。这些结果对于了解近期和未来粉尘产生的驱动力以及粉尘水平变化对气候的影响具有深远的影响。
Crustal dust in the atmosphere impacts Earth's radiative forcing directly by modifying the radiation budget and affecting cloud nucleation and optical properties, and indirectly through ocean fertilization, which alters carbon sequestration. Increased dust in the atmosphere has been linked to decreased global air temperature in past ice core studies of glacial to interglacial transitions. We present a continuous ice core record of aluminum deposition during recent centuries in the northern Antarctic Peninsula, the most rapidly warming region of the Southern Hemisphere; such a record has not been reported previously. This record shows that aluminosilicate dust deposition more than doubled during the 20th century, coincident with the approximate to 1 degrees C Southern Hemisphere warming: a pattern in parallel with increasing air temperatures, decreasing relative humidity, and widespread desertification in Patagonia and northern Argentina. These results have far-reaching implications for understanding the forces driving dust generation and impacts of changing dust levels on climate both in the recent past and future.