...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmospheric chemistry and physics >Contrasting organic aerosol particles from boreal and tropical forests during HUMPPA-COPEC-2010 and AMAZE-08 using coherent vibrational spectroscopy
【24h】

Contrasting organic aerosol particles from boreal and tropical forests during HUMPPA-COPEC-2010 and AMAZE-08 using coherent vibrational spectroscopy

机译：使用相干振动光谱法研究HUMPPA-COPEC-2010和AMAZE-08期间来自北方和热带森林的有机气溶胶颗粒

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

We present the vibrational sum frequency generation spectra of organic particles collected in a boreal forest in Finland and a tropical forest in Brazil. These spectra are compared to those of secondary organic material produced in the Harvard Environmental Chamber. By comparing coherent vibrational spectra of a variety of terpene and olefin reference compounds, along with the secondary organic material synthesized in the environmental chamber, we show that submicron aerosol particles sampled in Southern Finland during HUMPPA-COPEC-2010 are composed to a large degree of material similar in chemical composition to synthetic α-pinene-derived material. For material collected in Brazil as part of AMAZE-08, the organic component is found to be chemically complex in the coarse mode but highly uniform in the fine mode. When combined with histogram analyses of the isoprene and monoterpene abundance recorded during the HUMPPA-COPEC-2010 and AMAZE-08 campaigns, the findings presented here indicate that if air is rich in monoterpenes, submicron-sized secondary aerosol particles that form under normal OH and O3 concentration levels can be described in terms of their hydrocarbon content as being similar to α-pinene-derived model secondary organic aerosol particles. If the isoprene concentration dominates the chemical composition of organic compounds in forest air, then the hydrocarbon component of secondary organic material in the submicron size range is not simply well-represented by that of isoprene-derived model secondary organic aerosol particles but is more complex. Throughout the climate-relevant size range of the fine mode, however, we find that the chemical composition of the secondary organic particle material from such air is invariant with size, suggesting that the particle growth does not change the chemical composition of the hydrocarbon component of the particles in a significant way.
机译：我们介绍了在芬兰的北方森林和巴西的热带森林中收集的有机颗粒的振动总和频率产生谱。将这些光谱与在哈佛环境商会生产的二次有机材料的光谱进行比较。通过比较各种萜烯和烯烃参考化合物的相干振动光谱以及在环境室中合成的次要有机材料，我们表明，在HUMPPA-COPEC-2010期间在芬兰南部采样的亚微米气溶胶颗粒在很大程度上构成了化学成分与合成的α-pine烯衍生材料相似的材料。对于作为AMAZE-08一部分在巴西收集的材料，发现有机成分在粗模式下是化学复杂的，而在细模式下是高度均匀的。当结合HUMPPA-COPEC-2010和AMAZE-08活动期间记录的异戊二烯和单萜丰度的直方图分析时，此处呈现的发现表明，如果空气中富含单萜，则在正常OH和O3浓度水平可以用碳氢化合物含量来描述，类似于α-pine烯衍生的模型有机有机气溶胶颗粒。如果异戊二烯浓度主导森林空气中有机化合物的化学组成，那么亚微米尺寸范围内的次要有机材料的碳氢化合物组分不能简单地由异戊二烯衍生的模型性次要有机气溶胶颗粒很好地表示，而是更加复杂。但是，在整个精细模式的与气候有关的尺寸范围内，我们发现来自这种空气的次生有机颗粒材料的化学组成随尺寸而变化，这表明颗粒的生长不会改变烃类中碳氢化合物的化学组成。粒子以显着方式。

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