Hydrogen Peroxide, Formaldehyde, and Sub-Annual Snow Accumulation in West Antarctica: Participation in West Antarctic Traverse

该奖项支持一个项目，以提高对南极西部大气光化学的了解，如雪、雪和冰中记录的那样。大气和雪花采样将作为美国国际跨南极科学考察(US ITASE)穿越的一部分进行。将对这些样品进行过氧化氢(H_2O_2)和甲醛(HCHO)的测量，并将使用最近开发的基于物理的大气到雪转移模型来将这些成分的光化学模型估计与大气和雪中这些参数的浓度联系起来。大气向雪的转移效率和这些组分的保存与积雪的速度和时间密切相关。这些信息将通过分析过氧化氢、硝酸和氧的稳定同位素等季节性依赖物种的浓度来获得。沿美国ITASE导线采集样品将允许在广泛的地点进行采样，反映了许多不同的沉积环境，并覆盖了西南极地区的大部分地区。

This award supports a project to improve understanding of atmospheric photochemistry over West Antarctica, as recorded in snow, firn and ice. Atmospheric and firn sampling will be undertaken as part of the U.S. International Trans-Antarctic Scientific Expedition (US ITASE) traverses. Measurements of hydrogen peroxide (H2O2) and formaldehyde (HCHO) will be made on these samples and a recently developed, physically based atmosphere-to-snow transfer model will be used to relate photochemical model estimates of these components to the concentrations of these parameters in the atmosphere and snow. The efficiency of atmosphere-to-snow transfer and the preservation of these components is strongly related to the rate and timing of snow accumulation. This information will be obtained by analyzing the concentration of seasonally dependent species such as hydrogen peroxide, nitric acid and stable isotopes of oxygen. Collection of samples along the US ITASE traverses will allow sampling at a wide variety of locations, reflecting both a number of different depositional environments and covering much of the West Antarctic region.