...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >High concentrations of black carbon over middle latitudes in the North Pacific Ocean
【24h】

High concentrations of black carbon over middle latitudes in the North Pacific Ocean

机译：北太平洋中纬度地区高浓度的黑碳

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

During 4 years of research cruises over the central Pacific Ocean from 1993 through 1996, a region of extremely high concentration of black carbon aerosol (>150 ng C m(-3)) was routinely observed in the middle-latitude zone (27 degrees-48 degrees N) along the 175 degrees E line of longitude (near the International Date Line). In the cruises along the latitude lines of 30 degrees N and 35 degrees N, a strong west-to-east gradient of black carbon was also observed. Backward trajectory analysis shows that the air parcels containing high concentration of black carbon had passed over the Asian continent during the previous 10 days. The concentration of black carbon was relatively well correlated with non-sea-salt (nss.) SO42- in the aerosols. This indicates that the high concentration of black carbon observed originated from the combustion of sulfur-containing materials, presumably coal, on the Asian continent. Mass size distributions of the black carbon exhibit a mode at 0.5-0.7 mu m in aerodynamic diameter, which is unexpectedly large and coincides with the mode of SO42- aerosol. This suggests that black carbon and SO42- were internally mixed, and additional growth in particle size occurred through cloud processing. This study shows that anthropogenic aerosols are transported over greater distances than previously indicated by global dispersion models. The trajectory analysis indicates that this is due to the high-altitude transport of materials which reduces the possibility of encountering precipitating clouds; the aerosols are lofted over the continent initially, transported at relatively high altitudes over the ocean, and then brought to the surface in the central part of the North Pacific Ocean by mesoscale weather systems. The measured mixing ratio of black carbonss.SO42- and the state of the mixture (internal) suggest that the aerosols transported from Asia over the North Pacific Ocean have a low single-scattering albedo. [References: 48]
机译：从1993年到1996年，在太平洋中部进行了4年的研究航行期间，通常在中纬度地区（27度-沿着经度175度E线（在国际日期线附近）达到48度N）。在沿着北纬30度和北纬35度的巡航中，还观察到黑碳从西向东的强烈梯度。向后的轨迹分析显示，在过去的10天中，含有高浓度黑碳的空运包裹已经通过了亚洲大陆。黑碳的浓度与气溶胶中非海盐（nss。）SO42-的相关性相对较好。这表明观察到的高浓度黑碳源自亚洲大陆上含硫物质（可能是煤炭）的燃烧。炭黑的质量尺寸分布在空气动力学直径为0.5-0.7微米时显示出众的模态，这出乎意料的大，并且与SO42-气溶胶的模态一致。这表明黑碳和SO42-在内部混合，并且通过云处理使粒径进一步增加。这项研究表明，人为气溶胶的运输距离比以前全球分散模型所表明的要大。轨迹分析表明，这是由于材料的高空运输而降低了遇到降水云的可能性。气溶胶最初在整个大陆上空飞行，然后在相对较高的海拔高度上空运输，然后通过中尺度天气系统被带到北太平洋中部的地表。测得的黑碳ss.SO42-的混合比和混合物的状态（内部）表明，从亚洲输送到北太平洋的气溶胶的单散射反照率低。 [参考：48]

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