The near-global mesospheric potassium layer: Observations and modeling.
The near-global mesospheric potassium layer: Observations and modeling.
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DOI：
10.1002/2015jd023212
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发表时间：
2015-08-16
期刊：
影响因子：
--
通讯作者：
Feng W
中科院分区：
文献类型：
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作者：
Dawkins EC;Plane JM;Chipperfield MP;Feng W
流星金属层是上层大气化学和动力学的独特示踪剂。现有的激光雷达研究从几个地点表明，K表现出半年的季节性（冬季和夏季最大值），与Na和Fe的年度季节性（冬季最大值和夏季最小值）完全不同。这项工作使用Odin卫星上的光学光谱仪和红外成像仪系统仪器进行的星载观测，首次检索近全球K层。卫星数据（2004年至2013年中期）用于验证最近提出的全大气化学气候模式中钾化学方案的实施，该方案为这种半年一次的季节行为提供了化学基础。卫星和模式资料表明，这种半年一次的季节性变化在全球范围内是接近的，在中高纬度地区变化最大。K层的柱丰度、质心层高度和均方根宽度与有限的可用激光雷达记录一致。然后，K数据集被用来调查在夏季高纬度地区的金属层的极地中层云的影响。最后，零星的K层的发生频率和他们可能的联系，零星的E层进行了检查。利用卫星数据对全球K层进行首次研究以验证一个新模式极地中层云对K的去除证据确定全球零星K层出现频率
The meteoric metal layers act as unique tracers of chemistry and dynamics in the upper atmosphere. Existing lidar studies from a few locations show that K exhibits a semiannual seasonality (winter and summer maxima), quite unlike the annual seasonality (winter maximum and summer minimum) seen with Na and Fe. This work uses spaceborne observations made with the Optical Spectrograph and InfraRed Imager System instrument on the Odin satellite to retrieve the near‐global K layer for the first time. The satellite data (2004 to mid‐2013) are used to validate the implementation of a recently proposed potassium chemistry scheme in a whole atmosphere chemistry climate model, which provides a chemical basis for this semiannual seasonal behavior. The satellite and model data show that this semiannual seasonality is near global in extent, with the strongest variation at middle and high latitudes. The column abundance, centroid layer height, and root‐mean‐square width of the K layer are consistent with the limited available lidar record. The K data set is then used to investigate the impact of polar mesospheric clouds on the metal layers at high latitudes during summer. Finally, the occurrence frequency of sporadic K layers and their possible link to sporadic E layers are examined. First study of the global K layer using satellite data to validate a new model Evidence of removal of K by polar mesospheric clouds Determination of the global occurrence frequency of sporadic K layers