Brief communication: Spatial and temporal variations in surface snow chemistry along a traverse from coastal East Antarctica to the ice sheet summit (Dome A)

• Published in: The Cryosphere
• Main Authors: Shi, Guitao, Ma, Hongmei, Hu, Zhengyi, Chen, Zhenlou, An, Chunlei, Jiang, Su, Li, Yuansheng, Ma, Tianming, Yu, Jinhai, Wang, Danhe, Lu, Siyu, Sun, Bo, Hastings, Meredith G.
• Format: Text
• Language: English
• Published: 2021
• Subjects: Antarctic; The Antarctic; East Antarctica; Antarc*; Antarctica; Ice Sheet; Sea ice
• Online Access: https://doi.org/10.5194/tc-15-1087-2021; https://tc.copernicus.org/articles/15/1087/2021/

To better understand snow chemistry in different environments across the Antarctic ice sheet, we investigated snow ions on a traverse from the coast to Dome A. Results show that the non-sea-salt (nss) fractions of K + , Mg 2+ , and Ca 2+ are mainly from terrestrial particle mass and nssCl − is associated with HCl. Spatially, the non-sea-salt fractions of ions to the totals are higher in the interior areas than on the coast, and seasonally, the proportions are higher in summer than in winter. Negative <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msubsup><mi mathvariant="normal">nssSO</mi><mn mathvariant="normal">4</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="46pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="c5a996146bf72d5f219abc3c0f708bea"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-15-1087-2021-ie00001.svg" width="46pt" height="17pt" src="tc-15-1087-2021-ie00001.png"/></svg:svg> on the coast indicates sea salts from the sea ice, and marine biogenic emissions dominate snow <math xmlns="http://www.w3.org/1998/Math/MathML" id="M6" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msubsup><mi mathvariant="normal">SO</mi><mn mathvariant="normal">4</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="29pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="a8455a3a3390243c17ea2f3ca419ac4e"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-15-1087-2021-ie00002.svg" width="29pt" height="17pt" src="tc-15-1087-2021-ie00002.png"/></svg:svg> in interior areas throughout the year.