• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmosphere >Decreasing Aerosol Loading in the North American Monsoon Region
【24h】

Decreasing Aerosol Loading in the North American Monsoon Region

机译：减少北美季风区的气溶胶负荷

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We examine the spatio-temporal variability of aerosol loading in the recent decade (2005–2014) over the North American Monsoon (NAM) region. Emerging patterns are characterized using aerosol optical depth (AOD) retrievals from the NASA Terra/Moderate Resolution Imaging Spectroradiometer (MODIS) instrument along with a suite of satellite retrievals of atmospheric and land-surface properties. We selected 20 aerosol hotspots and classified them into fire, anthropogenic, dust, and NAM alley clusters based on the dominant driver influencing aerosol variability. We then analyzed multivariate statistics of associated anomalies during pre-, monsoon, and post-monsoon periods. Our results show a decrease in aerosol loading for the entire NAM region, confirming previous reports of a declining AOD trend over the continental United States. This is evident during pre-monsoon and monsoon for fire and anthropogenic clusters, which are associated with a decrease in the lower and upper quartile of fire counts and carbon monoxide, respectively. The overall pattern is obfuscated in the NAM alley, especially during monsoon and post-monsoon seasons. While the NAM alley is mostly affected by monsoon precipitation, the frequent occurrence of dust storms in the area modulates this trend. We find that aerosol loading in the dust cluster is associated with observed vegetation index and has only slightly decreased in the recent decade.
机译：我们研究了北美季风（NAM）地区最近十年（2005-2014）的气溶胶负荷时空变化。新兴模式的特征是使用NASA地/中分辨率成像光谱仪（MODIS）仪器的气溶胶光学深度（AOD）检索以及大气和陆地表面特性的卫星检索套件。我们根据影响气溶胶变异性的主要驱动因素，选择了20个气溶胶热点，并将其分为火灾，人为，粉尘和NAM胡同类。然后，我们分析了季风前，季风后和季风后相关异常的多元统计数据。我们的结果表明，整个NAM地区的气溶胶载量都下降了，这证实了美国大陆上AOD趋势下降的先前报道。在季风前和季风期间，火和人为星团很明显，这分别与火场数和一氧化碳的下四分之一和上四分之一减少有关。 NAM胡同中的整体模式变得模糊不清，尤其是在季风和季风后的季节。尽管NAM胡同主要受季风降水的影响，但该地区沙尘暴的频繁发生改变了这一趋势。我们发现，尘埃团中的气溶胶负荷与观测到的植被指数有关，并且在最近十年中仅略有下降。

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