...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmospheric chemistry and physics >Columnar aerosol properties from sun-and-star photometry: Statistical comparisons and day-to-night dynamic
【24h】

Columnar aerosol properties from sun-and-star photometry: Statistical comparisons and day-to-night dynamic

机译：太阳和星星光度法测量的柱状气溶胶特性：统计比较和昼夜动态

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This work presents the first analysis of long-term correlative day-to-night columnar aerosol optical properties. The aim is to better understand columnar aerosol dynamic from ground-based observations, which are poorly studied until now. To this end we have used a combination of sun-and-star photometry measurements acquired in the city of Granada (37.16?° N, 3.60?° W, 680 m a.s.l.; South-East of Spain) from 2007 to 2010. For the whole study period, mean aerosol optical depth (AOD) around 440 nm (± standard deviation) is 0.18 ± 0.10 and 0.19 ± 0.11 for daytime and nighttime, respectively, while the mean Angstr??m exponent (?±) is 1.0 ± 0.4 and 0.9 ± 0.4 for daytime and nighttime. The ANOVA statistical tests reveal that there are no significant differences between AOD and α obtained at daytime and those at nighttime. Additionally, the mean daytime values of AOD and α obtained during this study period are coherent with the values obtained in the surrounding AERONET stations. On the other hand, AOD around 440 nm present evident seasonal patterns characterised by large values in summer (mean value of 0.20 ± 0.10 both at daytime and nighttime) and low values in winter (mean value of 0.15 ± 0.09 at daytime and 0.17 ± 0.10 at nighttime). The Angstr??m exponents also present seasonal patterns, but with low values in summer (mean values of 0.8 ± 0.4 and 0.9 ± 0.4 at day- and night-time) and relatively large values in winter (mean values of 1.2 ± 0.4 and 1.0 ± 0.3 at daytime and nighttime). These seasonal patterns are explained by the differences in the meteorological conditions and by the differences in the strength of the aerosol sources. To take more insight about the changes in aerosol particles between day and night, the spectral differences of the Angstr??m exponent as function of the Angstr??m exponent are also studied. These analyses reveal increases of the fine mode radius and of the fine mode contribution to AOD during nighttime, being more remarkable in the summer seasons. These variations are explained by the changes of the local aerosol sources and by the meteorological conditions between daytime and nighttime, as well as aerosol aging processes. Case studies during summer and winter for different aerosol loads and types are also presented to clearly illustrate these findings.
机译：这项工作提出了长期相关的昼夜柱状气溶胶光学特性的长期分析。目的是从地面研究中更好地了解圆柱状气溶胶动力学，到目前为止，研究还很少。为此，我们结合了2007年至2010年在格拉纳达市（西班牙东南部37.16°N，3.60°W，680 m asl;西班牙东南部）获得的太阳和星光测光测量结果的组合。在整个研究期间，白天和夜间的平均气溶胶光学深度（AOD）约为440 nm（±标准偏差）为0.18±0.10和0.19±0.11，而平均Angstr ?? m指数（Δ±）为1.0±0.4白天和黑夜为0.9±0.4。 ANOVA统计检验表明，白天和夜间获得的AOD和α之间没有显着差异。此外，在此研究期间获得的AOD和α的平均白天值与周围AERONET站获得的值一致。另一方面，在440 nm附近的AOD呈现明显的季节性模式，其特征在于夏季的数值较大（白天和夜间的平均值为0.20±0.10），而冬季的数值较低（白天的平均值为0.15±0.09，而0.17±0.10）在夜间）。 Angstr ?? m指数也表现出季节性规律，但夏季的数值较低（白天和夜间的平均值为0.8±0.4和0.9±0.4），冬季的数值较大（冬季的平均值为1.2±0.4和0.4）。白天和晚上为1.0±0.3）。这些季节模式是由气象条件的差异和气溶胶源强度的差异引起的。为了更深入地了解白天和晚上之间气溶胶颗粒的变化，还研究了Angstr ?? m指数随Angstr ?? m指数变化的光谱差异。这些分析揭示了夜间精细模式半径的增加以及精细模式对AOD的贡献，在夏季尤为明显。这些变化可以通过当地气溶胶来源的变化以及白天和晚上之间的气象条件以及气溶胶老化过程来解释。还提供了夏季和冬季不同气溶胶负荷和类型的案例研究，以清楚地说明这些发现。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号