Year‐round record of surface ozone at coastal (Dumont d'Urville) and inland (Concordia) sites in East Antarctica
Year‐round record of surface ozone at coastal (Dumont d'Urville) and inland (Concordia) sites in East Antarctica
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DOI：
10.1029/2008jd011667
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发表时间：
2009-10
影响因子：
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通讯作者：
M. Legrand;S. Preunkert;B. Jourdain;H. Gallee;F. Goutail;R. Weller;J. Savarino
中科院分区：
文献类型：
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作者：
M. Legrand;S. Preunkert;B. Jourdain;H. Gallee;F. Goutail;R. Weller;J. Savarino
自 2004 年起在杜蒙迪维尔沿海东南极站 (DDU) 和自 2007 年起在位于东南极高原高原的康考迪亚站开始测量地表臭氧。康考迪亚 (Concordia) 的臭氧水平在 7 月份最高达到 35 ppbv，在 2 月份最低达到 21 ppbv。从 11 月到 1 月，臭氧水平经常突然增加，比平均水平高出 15-20 ppbv。它们归因于当地光化学臭氧的产生，正如之前在南极看到的那样。对康科迪亚夏季昼夜臭氧记录的详细检查表明，早上当地的光化学臭氧产量约为 0.2 ppbv h−1。 DDU 的臭氧记录显示，7 月份最高为 35 ppbv，1 月份最低为 18 ppbv。 DDU 的混合比始终高于另一个南极沿海站诺伊迈尔 (NM) 的混合比。两个沿海地点臭氧记录的显着差异在于，与 DDU 相比，新墨西哥州 7 月至 9 月发生的臭氧消耗事件更大，这可能是由于该地点近海海冰覆盖范围更大而导致 BrO 事件更强。第二个区别是从 11 月到 1 月在 DDU 观察到较大的日常波动，但在 NM 则没有。这是由于来自南极高原的气团对DDU的影响比NM更强。东南极洲大气如此高的氧化性所造成的后果将通过二甲硫醚 (DMS) 化学进行讨论。
Surface ozone is measured since 2004 at the coastal East Antarctic station of Dumont d'Urville (DDU) and since 2007 at the Concordia station located on the high East Antarctic plateau. Ozone levels at Concordia reach a maximum of 35 ppbv in July and a minimum of 21 ppbv in February. From November to January, sudden increases of the ozone level, up to 15-20 ppbv above average, often take place. They are attributed to local photochemical ozone production as previously seen at the South Pole. The detailed examination of the diurnal ozone record in summer at Concordia suggests a local photochemical ozone production of around 0.2 ppbv h−1 during the morning. The ozone record at DDU exhibits a maximum of 35 ppbv in July and a minimum of 18 ppbv in January. Mixing ratios at DDU are always higher than those at Neumayer (NM), another coastal Antarctic station. A noticeable difference in the ozone records at the two coastal sites lies in the larger ozone depletion events occurring from July to September at NM compared to DDU, likely due to stronger BrO episodes in relation with a larger sea ice coverage offshore that site. A second difference is the large day-to-day fluctuations which are observed from November to January at DDU but not at NM. That is attributed to a stronger impact at DDU than at NM of air masses coming from the Antarctic plateau. The consequences of such a high oxidizing property of the atmosphere over East Antarctica are discussed with regard to the dimethylsulfide (DMS) chemistry.