• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>other >Intra-annual variations of regional aerosol optical depth vertical distribution and particle types from multiple satellite and ground-based observational datasets
【2h】

Intra-annual variations of regional aerosol optical depth vertical distribution and particle types from multiple satellite and ground-based observational datasets

机译：来自多个卫星和地面观测数据集的区域气溶胶光学深度垂直分布和颗粒类型的年内变化

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The climatic and health effects of aerosols are strongly dependent on the intra-annual variations in their loading and properties. While the seasonal variations of regional aerosol optical depth (AOD) have been extensively studied, understanding the temporal variations in aerosol vertical distribution and particle types is also important for an accurate estimate of aerosol climatic effects. In this paper, we combine the observations from four satellite-borne sensors and several ground-based networks to investigate the seasonal variations of aerosol column loading, vertical distribution, and particle types over three populous regions: the Eastern United States (EUS), Western Europe (WEU), and Eastern and Central China (ECC). In all three regions, column AOD, as well as AOD at heights above 800 m, peaks in summer/spring, probably due to accelerated formation of secondary aerosols and hygroscopic growth. In contrast, AOD below 800m peaks in winter over WEU and ECC regions because more aerosols are confined to lower heights due to the weaker vertical mixing. In the EUS region, AOD below 800m shows two maximums, one in summer and the other in winter. The temporal trends in low-level AOD are consistent with those in surface fine particle (PM2.5) concentrations. AOD due to fine particles (< 0.7 μm diameter) is much larger in spring/summer than in winter over all three regions. However, the coarse mode AOD (> 1.4 μm diameter), generally shows small variability, except that a peak occurs in spring in the ECC region due to the prevalence of airborne dust during this season. When aerosols are classified according to sources, the dominant type is associated with anthropogenic air pollution, which has a similar seasonal pattern as total AOD. Dust and sea-spray aerosols in the WEU region peak in summer and winter, respectively, but do not show an obvious seasonal pattern in the EUS region. Smoke aerosols, as well as absorbing aerosols, present an obvious unimodal distribution with a maximum occurring in summer over the EUS and WEU regions, whereas they follow a bimodal distribution with peaks in August and March (due to crop residue burning) over the ECC region.
机译：气溶胶对气候和健康的影响在很大程度上取决于其载量和特性的年内变化。虽然已经广泛研究了区域气溶胶光学深度（AOD）的季节性变化，但了解气溶胶垂直分布和颗粒类型的时间变化对于准确估算气溶胶气候影响也很重要。在本文中，我们结合了来自四个卫星传感器和几个地面网络的观测结果，研究了三个人口稠密地区（美国东部，美国西部）的气溶胶柱载荷，垂直分布和颗粒类型的季节性变化。欧洲（WEU）和中国东部和中部（ECC）。在所有三个区域中，AOD柱以及800 m以上高度的AOD在夏季/春季达到峰值，这可能是由于次级气溶胶形成加快和吸湿性增长所致。相反，由于垂直混合较弱，更多的气溶胶被限制在较低的高度，因此WEU和ECC地区冬季的AOD高峰在冬季800m以下。在EUS地区，低于800m的AOD显示两个最大值，一个在夏天，另一个在冬天。低水平AOD的时间趋势与表面微粒（PM2.5）浓度的时间趋势一致。在所有三个区域中，春季/夏季由于细颗粒（直径<0.7μm）引起的AOD都比冬季大得多。但是，粗模式AOD（直径> 1.4μm）通常显示出较小的变化，除了由于该季节中空气中尘埃的盛行，ECC区域的春季出现一个峰值。根据来源对气雾剂进行分类时，主要类型与人为空气污染有关，其人为污染与总AOD相似。 WEU地区的沙尘气溶胶和海喷雾气溶胶分别在夏季和冬季达到峰值，但在EUS地区则没有明显的季节性模式。烟雾气溶胶以及吸收性气溶胶呈现出明显的单峰分布，在夏季在EUS和WEU地区出现最大值，而在ECC区则遵循双峰分布，在8月和3月达到峰值（由于作物残渣燃烧）。 。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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