Collaborative Research: Deposition of the HFC Degradation Product Trifluoroacetate in Antarctic Snow and Ice

0087776 McConnell该奖项支持一个为期三年的项目，以获取南极雪中三氟乙酸盐（TFA）浓度的数据。 三氟乙酸是卤代乙烷衍生物（HCFC，HFC）的一种高度持久的大气降解产物，已作为环境友好的氯氟烃（CFC）替代品引入。 然而，人们担心广泛引入HCFC和HFC会导致TFA在水生生态系统中积累。 目前关于前工业化时期大气和地表沃茨（包括南极冰）中反式脂肪酸背景浓度的数据尚不明确，人为反式脂肪酸对这些背景浓度的影响尚不清楚。 冰芯记录可以提供背景和人为TFA沉积的替代记录。 本研究的主要目的是利用南极的冰芯和雪坑来建立一个跨越1000年的TFA沉积的时间记录，但重点是过去20年。 从工业化前到现在，南极和南极西部近地表冰雪中TFA的记录将是独一无二的，将有助于更好地了解这种污染物在南极洲乃至地球仪上的起源、迁移和归宿。 此外，了解污染物的自然和人为来源、区域和远距离移动以及最终归宿，对于评估对南极生态系统的潜在影响至关重要。

0087776McConnellThis award supports a three year project to acquire data on the concentration of trifluoroacetate (TFA) in Antarctic snow. Trifluoroacetate is a highly persistent, atmospheric degradation product of the halogenated ethane derivatives (HCFC, HFC) that have been introduced as environmentally friendly chlorofluorocarbon (CFC) substitutes. However, there is concern that the widespread introduction of HCFC's and HFC's will lead to the accumulation of TFA in aquatic ecosystems. Current data on pre-industrial, background concentration of TFA in meteoric and surface waters, including Antarctic ice, are ambiguous and the impact of anthropogenic TFA on these background concentrations is unclear. Ice core records can provide proxy records of background and anthropogenic TFA deposition. The primary objective of this research is to use ice cores and snow pits at South Pole to develop a temporal record of TFA deposition spanning ~ 1000 years but focused on the past 20 years. The pre-industrial to present record of TFA in near surface snow and ice at South Pole and in West Antarctica will be unique and will lead to a much better understanding of the origin, transport and fate of this contaminant over Antarctica and possibly the globe. In addition, understanding the natural and anthropogenic sources, the regional and long-range movement, and the eventual fate of contaminants is critical to assessing potential impacts on Antarctic ecosystems.