Abstract

Results of lidar observations at a wavelength of 532 nm in Obninsk over the period from 2012 to 2021 are presented. In 2014–2018 the stratosphere aerosol was in a state close to the background. In 2019, aerosol maxima were observed in the 15–30 km layer associated with the eruptions of the Ambae and Raikoke volcanoes. The seasonal behavior of the integral backscattering coefficient in the background period is presented. In the lower layer of the stratosphere of 13–23 km, an increase in backscattering was observed in the second half of the year, associated with an increase in the number of natural fires. In the 23–30 km layer, the maximum backscattering was observed in summer. It was found that the contribution of the lower layer of 10–15 km to the optical thickness of the entire layer of 10–30 km is on average 61%. This implies the need to take into account the aerosol of the lower layer of 10–15 km in the overall balance of stratospheric aerosol in chemical–climatic models of the stratosphere. In the second half of the year, aerosol of natural fires is often observed in the 10–15 km layer. In some episodes, the addition of natural fire aerosol to an optical layer thickness of 10–30 km with respect to the spherical sulfuric acid aerosol ranges from 50 to 150%. At the same time, in annual mean terms, this additive in 2014–2021 on average was only 10%. In the last 5 years, there has been a trend towards an increase in the content of aerosol from natural fires, but so far the content of sulfate aerosol in the stratosphere remains predominant.

中文翻译：

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2012-2021年奥布宁斯克平流层气溶胶激光雷达观测：火山喷发和生物质燃烧的影响

摘要

介绍了 2012 年至 2021 年期间奥布宁斯克波长 532 nm 的激光雷达观测结果。2014-2018年平流层气溶胶处于接近本底的状态。2019 年，在与 Ambae 和 Raikoke 火山喷发相关的 15-30 公里层中观察到气溶胶最大值。给出了背景期间积分后向散射系数的季节性行为。在平流层下层13-23公里处，下半年观察到后向散射增加，这与自然火灾数量的增加有关。在23-30 km层，在夏季观察到最大后向散射。研究发现，下层10-15 km对整个10-30 km层光学厚度的贡献平均为61%。这意味着在平流层化学气候模型的平流层气溶胶总体平衡中需要考虑10-15公里下层的气溶胶。下半年，10~15公里层内常观察到自然火灾气溶胶。在某些情况下，相对于球形硫酸气溶胶，光学层厚度为 10-30 公里的天然火灾气溶胶的添加量范围为 50% 至 150%。同时，以年均值计算，2014-2021年这一添加剂的平均含量仅为10%。过去5年中，自然火灾产生的气溶胶含量呈增加趋势，但迄今为止，平流层中的硫酸盐气溶胶含量仍然占主导地位。