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Hydroxyl in the stratosphere and mesosphere - Part 1: Diurnal variability

机译：平流层和中层中的羟基-第1部分：日变化

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Diurnal variations in hydroxyl (OH) in the stratosphere and mesosphere are analyzed using measurements from the Aura Microwave Limb Sounder (MLS). The primary driver for OH diurnal variations is the ultraviolet actinic flux that initiates the photochemical production of reactive hydrogen species. The magnitude of this flux is governed largely by changes in solar zenith angle (SZA) throughout the day, and OH diurnal variations are well approximated by an exponential function of the secant of SZA. Measured OH concentrations are fit to a function of the form exp[-β(SZA)], where the parameter β is a function of altitude. We examine the magnitude of β and show that it is related to the optical depths of ultraviolet absorption by ozone and molecular oxygen. Values of β from SLIMCAT model simulations show the same vertical structure as those from MLS and the average level of agreement between model and measurements is 6%. The vertical profile of β from MLS can be represented by a simple analytic formulation involving the ozone and water vapor photodissociation rates. This formulation is used to infer the altitude dependence of the primary production mechanisms for OH: the reaction of excited-state atomic oxygen with water vapor versus the direct photodissociation of water vapor.
机译：平流层和中层中羟基（OH）的昼夜变化使用Aura微波肢体测深仪（MLS）的测量进行分析。 OH日变化的主要驱动力是紫外光化通量，该光化通量引发反应性氢物种的光化学产生。该通量的大小在很大程度上取决于一天中太阳天顶角（SZA）的变化，OH日变化可以通过SZA的割线的指数函数很好地近似。测得的OH浓度适合于exp [-β（SZA）]形式的函数，其中参数β是海拔的函数。我们检查了β的大小，发现它与臭氧和分子氧对紫外线的吸收的光学深度有关。来自SLIMCAT模型仿真的β值显示出与MLS相同的垂直结构，模型与测量值之间的平均一致性为6％。来自MLS的β的垂直分布可以通过涉及臭氧和水蒸气光解离速率的简单分析公式来表示。此公式用于推断OH的主要生成机理的高度依赖性：激发态原子氧与水蒸气的反应与水蒸气的直接光解离。

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