2016
DOI: 10.1002/2016gl070203
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Trends of perchlorate in Antarctic snow: Implications for atmospheric production and preservation in snow

Abstract: Perchlorate concentration ranges from a few to a few hundred ng kg−1 in surface and shallow‐depth snow at three Antarctic locations (South Pole, Dome A, and central West Antarctica), with significant spatial variations dependent on snow accumulation rate and/or atmospheric production rate. An obvious trend of increasing perchlorate since the 1970s is seen in South Pole snow. The trend is possibly the result of stratospheric chlorine levels elevated by anthropogenic chlorine emissions; this is supported by the … Show more

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Cited by 20 publications
(41 citation statements)
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“…A major source of chlorine radicals and oxy-chlorine species in the atmosphere are organic chlorine compounds from both natural and anthropogenic emissions . In a recent study, Jiang et al found higher perchlorate levels in Antarctic snow since the 1970s than those in older snow and suggested that this increase is correlated with stratospheric chlorine, which has increased significantly since the 1970s due to anthropogenic emission of organic chlorine compounds . Because of possible postdepositional change to perchlorate in Antarctic snow, the impact of anthropogenic chlorine on perchlorate was difficult to assess.…”
Section: Resultsmentioning
confidence: 99%
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“…A major source of chlorine radicals and oxy-chlorine species in the atmosphere are organic chlorine compounds from both natural and anthropogenic emissions . In a recent study, Jiang et al found higher perchlorate levels in Antarctic snow since the 1970s than those in older snow and suggested that this increase is correlated with stratospheric chlorine, which has increased significantly since the 1970s due to anthropogenic emission of organic chlorine compounds . Because of possible postdepositional change to perchlorate in Antarctic snow, the impact of anthropogenic chlorine on perchlorate was difficult to assess.…”
Section: Resultsmentioning
confidence: 99%
“…In a recent study, Jiang et al found higher perchlorate levels in Antarctic snow since the 1970s than those in older snow and suggested that this increase is correlated with stratospheric chlorine, which has increased significantly since the 1970s due to anthropogenic emission of organic chlorine compounds . Because of possible postdepositional change to perchlorate in Antarctic snow, the impact of anthropogenic chlorine on perchlorate was difficult to assess. In exploring possible causes of the post-1980 increase in the Arctic, Furdui et al examined , the emission records of several organic chlorine compounds and suggested that the increased emission of methyl chloroform (CH 3 CCl 3 ) since 1970 and the drastic decrease since the mid-1990s are likely the main contributors to the perchlorate trend since 1980.…”
Section: Resultsmentioning
confidence: 99%
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“…2 These compounds have been found to be widespread in the soil, the atmosphere, seawater, rain and snow. [3][4][5][6] Also, there is significant evidence for the existence of perchlorate in the atmosphere and soil of Mars [7][8][9] and elsewhere in the Solar System. 10 Inorganic chlorine in the stratosphere exists as Cl, ClO, HCl, ClONO2, HOCl, and HClO4, and about 50% of the total inorganic chlorine is in the form of HClO4 (0.2 ppb).…”
Section: Introductionmentioning
confidence: 99%