A model for large glacial–interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): palaeoclimatic implications and prospects for refining ice core chronologies
A model for large glacial–interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): palaeoclimatic implications and prospects for refining ice core chronologies
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大型冰期-间冰期气候引起的深层冰芯（南极洲中部）灰尘和海盐浓度变化的模型：古气候影响和完善冰芯年代学的前景
DOI：
10.1111/j.1600-0889.2009.00437.x
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
B. Delmonte
中科院分区：
文献类型：
--
作者：
J. Petit;B. Delmonte
已经开发了一个半经验模型，以再现在南极内陆冰芯中观察到的大陆尘埃和海洋钠浓度（因子分别为1.50和1.55）的冰川-间冰期变化。该模型使用高对流层内气溶胶的概念路径;假设南极表面上的干沉积杂质;使用独立于气候的气溶胶过境时间的估计;假设中纬度气溶胶路径期间的温度依赖性去除过程。该模型拟合的数据在过去的四个气候周期从东方和EPICA圆顶C南极网站。随着温度的冷却，气溶胶的响应表明不同纬度之间的气候耦合模式不同，这可能是连续的或低于温度阈值的钠和灰尘，分别。该模型估计，南美洲南部的尘埃源活动在冰期比全新世高出两到三倍，南大洋的冰川温度比全新世低3-5摄氏度。这两个估计数似乎与独立观察一致。去除温度影响后，尘埃和钠残留的两个网站显示轨道频率在相反的相位在岁差时标。这种长期的与日照有关的陆地和海洋气溶胶输入调制，可以提供一个化学起搏器，用于完善冰芯年表。
A semi-empirical model has been developed to reproduce glacial–interglacial changes of continental dust and marine sodium concentrations (factor of ∼50 and ∼5, respectively) observed in inland Antarctic ice cores. The model uses conceptual pathways of aerosols within the high troposphere; assumes the dry deposition of impurities on the Antarctic surface; uses estimates of aerosol transit times taken independent of climate; assumes a temperature-dependent removal process during aerosol pathways from the mid-latitudes. The model is fitted to the data over the last four climate cycles from Vostok and EPICA Dome C Antarctic sites. As temperature is cooling, the aerosol response suggests different modes of climate couplings between latitudes, which can be continuous or below temperature thresholds for sodium and dust, respectively. The model estimates a southern South America dust source activity two to three times higher for glacial periods than for the Holocene and a glacial temperature over the Southern Ocean 3–5 ◦C cooler. Both estimates appear consistent with independent observations. After removal of temperature effects, dust and sodium residuals for both sites show orbital frequencies in opposite phase at the precession timescale. Such long-term insolation-related modulation of terrestrial and marine aerosol input, could provide a chemical pacemaker useful for refining ice core chronologies.
影响因子：
56.9
作者：
Lamy, F;Kaiser, J;Stoner, J
通讯作者：
Stoner, J