Chemical compositions of sulfate and chloride salts over the last termination reconstructed from the Dome Fuji ice core, inland Antarctica
Chemical compositions of sulfate and chloride salts over the last termination reconstructed from the Dome Fuji ice core, inland Antarctica
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从南极洲内陆富士圆顶冰芯重建的最后终点的硫酸盐和氯化物盐的化学成分
DOI：
10.1002/2014jd022030
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发表时间：
2014
影响因子：
--
通讯作者：
T. Hondoh
中科院分区：
文献类型：
--
作者：
Oyabu;I.;Y. Iizuka;R. Uemura;T. Miyake;M. Hirabayashi;H. Motoyama;T. Sakurai;T. Suzuki;T. Hondoh
气溶胶的通量和化学成分影响气候。南极冰芯保存了过去大气气溶胶的记录，提供了有关过去大气环境的有用信息。然而，很少有研究直接测量保存在冰芯中的气溶胶颗粒的化学成分。在这里，我们提出的化学成分的硫酸盐和氯化物盐的气溶胶粒子在圆顶富士冰芯。分析方法涉及冰升华，时间段涵盖了最后一次终止，距今25.0-11.0万年（Kyr B. P.），350年的决议。可溶性颗粒的主要成分是CaSO 4、Na 2SO 4和NaCl。在16.8 kyr B. P.，主要的硫酸盐从CaSO 4（冰川型）转变为Na 2SO 4（间冰期型）。硫酸盐通量（CaSO 4 + Na 2SO 4）与富士山δ 18 O在千年的时间尺度呈负相关。这种相关性是一致的想法，硫酸盐气溶胶有助于最后一次冰消期南极内陆变暖减少气溶胶的间接影响。在16.3和11.0 kyr B. P.之间，NaCl的存在表明冬季大气气溶胶被保存下来。12.3和11.0 kyr B. P.之间的高NaCl/Na 2SO 4分数表明，在此期间，冬季大气气溶胶的传输的贡献增加。
The flux and chemical composition of aerosols impact the climate. Antarctic ice cores preserve the record of past atmospheric aerosols, providing useful information about past atmospheric environments. However, few studies have directly measured the chemical composition of aerosol particles preserved in ice cores. Here we present the chemical compositions of sulfate and chloride salts from aerosol particles in the Dome Fuji ice core. The analysis method involves ice sublimation, and the period covers the last termination, 25.0–11.0 thousand years before present (kyr B.P.), with a 350 year resolution. The major components of the soluble particles are CaSO4, Na2SO4, and NaCl. The dominant sulfate salt changes at 16.8 kyr B.P. from CaSO4, a glacial type, to Na2SO4, an interglacial type. The sulfate salt flux (CaSO4plus Na2SO4) inversely correlates with δ18O in Dome Fuji over millennial timescales. This correlation is consistent with the idea that sulfate salt aerosols contributed to the last deglacial warming of inland Antarctica by reducing the aerosol indirect effect. Between 16.3 and 11.0 kyr B.P., the presence of NaCl suggests that winter atmospheric aerosols are preserved. A high NaCl/Na2SO4fraction between 12.3 and 11.0 kyr B.P. indicates that the contribution from the transport of winter atmospheric aerosols increased during this period.