Diurnal variation of the potassium layer in the upper atmosphere.
Diurnal variation of the potassium layer in the upper atmosphere.
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DOI：
10.1002/2015gl063718
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发表时间：
2015-05-16
影响因子：
5.2
通讯作者：
Plane JM
中科院分区：
文献类型：
--
作者：
Feng W;Höffner J;Marsh DR;Chipperfield MP;Dawkins EC;Viehl TP;Plane JM
10 月份（2004-2011 年）使用德国屈隆斯博恩（北纬 54.1°，东经 11.7°）的多普勒激光雷达对 80 至 110 公里之间的钾 (K) 原子昼夜周期进行了测量。通过在三维化学气候模型中使用 K 的中性和电离化学的详细描述来探索 K 数密度的明显昼夜变化。该模型捕获了该层的日变化和半日变化的幅度和相位，尽管 90 公里左右的峰值日幅度被高估了。模型表明，总钾密度（≈ K + K+ + KHCO3）在每个海拔高度上表现出很小的日变化，并且日变化很大程度上是由这些库物种之间的光化学转化驱动的。相比之下，潮汐驱动的垂直输送在这个中纬度位置的影响很小，并且温度的昼夜波动意义不大，因为它们很小并且钾的化学性质相对与温度无关。 K 数密度中明显的局部时间依赖性 WACCM-K 模拟了 K 的日变化，与观测结果非常吻合 光化学在 K 的日变化中起着重要作用
Measurements of the diurnal cycle of potassium (K) atoms between 80 and 110 km have been made during October (for the years 2004–2011) using a Doppler lidar at Kühlungsborn, Germany (54.1°N, 11.7°E). A pronounced diurnal variation is observed in the K number density, which is explored by using a detailed description of the neutral and ionized chemistry of K in a three‐dimensional chemistry climate model. The model captures both the amplitude and phase of the diurnal and semidiurnal variability of the layer, although the peak diurnal amplitude around 90 km is overestimated. The model shows that the total potassium density (≈ K + K+ + KHCO3) exhibits little diurnal variation at each altitude, and the diurnal variations are largely driven by photochemical conversion between these reservoir species. In contrast, tidally driven vertical transport has a small effect at this midlatitude location, and diurnal fluctuations in temperature are of little significance because they are small and the chemistry of K is relatively temperature independent. Pronounced local time dependency in the K number density WACCM‐K simulates the diurnal variation of K in good agreement with observation Photochemistry plays an important role in the diurnal variation of K