Chemical composition of snow-water and scavenging ratios over costal Antarctica
Chemical composition of snow-water and scavenging ratios over costal Antarctica
复制标题
南极洲沿海雪水的化学成分和清除率
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
P. Safai
中科院分区：
文献类型：
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作者：
K. Budhavant;P. Rao;P. Safai
在12月进行的第29次印度南极考察期间，在南极洲沿海拉斯曼山和迈特里附近收集了雪样本和气溶胶样本，2009年至2010年3月。本研究的主要目的是在南极洲沿海的新鲜和表面的雪的化学成分的特点，并确定清除率使用雪和气溶胶样品的组合物。地表和新鲜雪的pH值分别为6.03和5.64。沿沿着127 km的样带从冰架的向海边缘到南极高原收集了表层雪样品，并分析了主要无机组分SO 4 2-、NO3 -、Cl-、NH 4+、Na+、K+、Ca 2+和Mg 2+的存在。据观察，Na+和Cl-是南极最丰富的离子。在新鲜雪和表层雪中也发现了相当数量的SO 42-，这可能是由于来自北方的远距离输送以及海洋浮游植物氧化产生的DMS所致。新鲜雪中离子的百分比较高可能是因为其中的颗粒物质被捕获。海盐成分，即，Na+、Cl-和Mg 2+随离海岸距离的增加而减少。酸性组分主要被NH 4+和Ca 2+中和。对Na+的清除率最大，对NO3 -的清除率最小，表明粗颗粒物的清除率较高，细颗粒物的清除率较低。此外，我们还试图找出所观察到的雪水化学物种的可能来源。
Snow samples and aerosol samples were collected at coastal Antarctica near Larsemann Hills and Maitri, during the 29th Indian Antarctic Expedition carried out during Dec., 2009 to March 2010. The main objective of this study was to characterize the chemical composition of fresh and surface snow at coastal Antarctica and to determine the scavenging ratios using composition of snow and aerosol samples. The pH of surface and fresh snow were 6.03 and 5.64 respectively. The surface snow samples were collected along a 127-km transect from the seaward edge of the ice shelf to the Antarctic plateau and analyzed for the presence of the major inorganic components SO4 2-, NO3 -, Cl-, NH4 +, Na+, K+, Ca2+ and Mg2+. It was observed that Na+ and Cl- were the most abundantly occurring ions at Antarctica. Considerable amount of SO4 2- was also found in the both fresh and surface snow which may be attributed to the long range transport from Northern Hemisphere as well as to the oxidation of DMS produced by marine phytoplankton. A higher percentage of the ions in fresh snow may be because of trapping of the particulate matter in it. The sea-salt components i.e., Na+, Cl- and Mg2+ decreased with increasing distance from the coast. The acidic components were neutralized mainly by NH4 + and Ca2 +. The scavenging ratio was maximum for Na+ and minimum for NO3 -, indicating that the scavenging efficiency was higher for coarse size particles and lower for fine size particles. In addition, we have attempted to find out the possible sources of the observed chemical species in snow-water.
影响因子：
5.2
作者：
D. Spracklen;S. Arnold;J. Sciare;K. Carslaw;C. Pio
通讯作者：
D. Spracklen;S. Arnold;J. Sciare;K. Carslaw;C. Pio