Observations of iodine monoxide columns from satellite
Observations of iodine monoxide columns from satellite
复制标题
从卫星观测一氧化碘柱
DOI：
10.5194/acp-8-637-2008
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发表时间：
2007
影响因子：
6.3
通讯作者：
J. Burrows
中科院分区：
文献类型：
--
作者：
A. Schönhardt;A. Richter;F. Wittrock;H. Kirk;H. Oetjen;H. Roscoe;J. Burrows
对流层中的碘物质与臭氧消耗和新粒子的形成有关。在这项研究中，一氧化碘（IO）列检索从测量的SCIAMACHY卫星仪器，加上讨论其不确定性和检测限。最大数量的IO被发现接近春天在南极洲。一氧化碘在南极洲的季节性变化，揭示了高值在春季，略低于IO在夏季期间，并再次在秋季较大的金额。冬季，在卫星测量的地区没有发现高IO水平。这一季节性周期与最近在南极洲进行的地面测量非常吻合。在北极地区，在分析期间没有发现IO水平升高。这意味着在两个极区中存在不同的碘释放条件。要调查可能的释放机制，IO列对流层溴O，和冰覆盖的比较进行了描述和讨论。IO和BrO的时间和空间分布之间的一些平行和有趣的差异被确定。总体而言，卫星检索的IO数据的大空间覆盖范围和长期数据集的可用性提供了有关对流层碘化合物丰度和分布的新见解。
Iodine species in the troposphere are linked to ozone depletion and new particle formation. In this study, a full year of iodine monoxide (IO) columns retrieved from measurements of the SCIAMACHY satellite instrument is presented, coupled with a discussion of their uncertainties and the detection limits. The largest amounts of IO are found near springtime in the Antarctic. A seasonal variation of iodine monoxide in Antarctica is revealed with high values in springtime, slightly less IO in the summer period and again larger amounts in autumn. In winter, no elevated IO levels are found in the areas accessible to satellite measurements. This seasonal cycle is in good agreement with recent ground-based measurements in Antarctica. In the Arctic region, no elevated IO levels were found in the period analysed. This implies that different conditions with respect to iodine release exist in the two Polar Regions. To investigate possible release mechanisms, comparisons of IO columns with those of tropospheric BrO, and ice coverage are described and discussed. Some parallels and interesting differences between IO and BrO temporal and spatial distributions are identified. Overall, the large spatial coverage of satellite retrieved IO data and the availability of a long-term dataset provide new insight about the abundances and distributions of iodine compounds in the troposphere.