• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Air and Waste Management Association annual conference and exhibition >Atmospheric Deposition in Durham, North Carolina
【24h】

Atmospheric Deposition in Durham, North Carolina

机译：北卡罗来纳州达勒姆市的大气沉积

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

摘要

The two drinking water reservoirs in the watersheds of the City of Durham have experienced declines in water quality as a result of nutrient (nitrogen and phosphorus) loading. Both Falls Lake and Jordan Lake are classified as nutrient sensitive waters by the NC Environmental Management Commission. To facilitate future planning, Durham commissioned this work to study the contribution of atmospheric deposition of nitrogen and phosphorus species to the watershed loading of these two nutrients. Atmospheric deposition of nitrogen has been shown to be a significant contributor to nutrient loading to ecosystems. For example, EPA has reported that atmospheric deposition of nitrogen is the highest nitrogen input load to the Chesapeake Bay watershed, exceeding the contributions from fertilizer, manure, point sources, and septic systems. We collected wet and dry samples of nitrate, nitric acid, ammonia, ammonium, and organic nitrogen reported as nitrogen at two sites in Durham. The wet concentration data were generally in line with the concentration data measured at the nine National Atmospheric Deposition Program (NADP) sites in North Carolina. Dry nitrate was somewhat higher than the rural sites. This study collected and analyzed dry gaseous ammonia, which is not included in the Clean Air Status and Trends Network (CASTNET) program, and organic nitrogen, which is not included in the NADP program. Therefore, the results reported here provide a more complete accounting of total nitrogen deposition than are provided by the CASTNET and NADP programs. No phosphorus deposition was detected. Deposition data are reported for wet and dry samples as kilograms of nitrogen per hectare per year (kg N/ha/year). Wet deposition comprises the majority of the total deposition, and is dependent on the amount of rainfall. For the North Durham site, total deposition was calculated as 4.9 kg N/ha/year. For the South Durham site, total deposition was calculated as 6.6 kg N/ha/year.
机译：由于营养物质（氮和磷）的负载，达勒姆市流域中的两个饮用水水库的水质有所下降。 NC环境管理委员会将Falls湖和Jordan湖都归类为对营养敏感的水域。为了便于将来的计划，达勒姆（Durham）委托这项工作来研究大气中氮和磷物质的沉积对这两种养分的分水岭负荷的贡献。氮在大气中的沉积已被证明是生态系统养分负载的重要因素。例如，EPA报告说，大气中的氮沉积是切萨皮克湾流域的最高氮输入负荷，超过了肥料，肥料，点源和化粪池系统的贡献。我们在达勒姆（Durham）的两个地点收集了硝酸盐，硝酸，氨，铵和有机氮的干湿样品。湿浓度数据通常与在北卡罗来纳州的9个国家大气沉积计划（NADP）站点测得的浓度数据一致。干硝酸盐含量略高于农村地区。这项研究收集并分析了干燥气态氨（未包括在“清洁空气状态和趋势网络”（CASTNET）计划中）和有机氮（其未包括在NADP程序中）。因此，与CASTNET和NADP程序相比，此处报告的结果提供了更完整的总氮沉积量。没有检测到磷沉积。湿和干样品的沉积数据报告为每年每公顷公斤氮（kg N / ha /年）。湿沉降占总沉积的大部分，并且取决于降雨量。对于北达勒姆厂区，总沉积量计算为4.9千克氮/公顷/年。对于南达勒姆厂区，总沉积量计算为6.6千克氮/公顷/年。

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