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首页> 外文会议>2nd International Nitrogen Conference , Oct 14-18, 2001, Potomac, Maryland, USA >Class I Areas at Risk: Event-Based Nitrogen Deposition to a High-Elevation, Western Site
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Class I Areas at Risk: Event-Based Nitrogen Deposition to a High-Elevation, Western Site

机译：处于危险中的I类地区：基于事件的氮沉积到高海拔西部地区

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Between June 1, 2000 and September 30, 2000, 32 precipitation events were sampled near Tellu-ride, CO at an elevation of 3200 m. The wet deposition site was operated following protocols of the Atmospheric Integrated Research Monitoring Network (AIRMoN), a network of the National Atmospheric Deposition Network (NADP). Inorganic nitrogen deposition at theTelluride site of 1.41 kg ha~(-1) during the study period was 25 to 50% higher than nearby NADP sites. In turn, nitrogen deposition at these NADP sites was similar to high-elevation sites in and near the Colorado Front Range that have been shown to be impacted by atmospheric deposition of inorganic nitrogen in wetfall. Power plant emissions are a likely source of a major portion of this elevated inorganic nitrogen in wetfall to the San Juan Mountains. Principal component analysis (PCA) shows that solutes formed by gases that are emitted from power plants were clustered tightly together, including nitrate, ammonium, sulfate, and chloride. Trajectory analysis, including both backward and forward trajectories, shows that the air masses that contributed to the precipitation events with high amounts of nitrogen deposition at the Telluride site passed directly over or near power plants. Our results suggest that Class I Wilderness Areas in and near the San Juan Mountains are at risk to ecosystem impairment at present rates of atmospheric deposition of inorganic nitrogen in wetfall. Deployment of proposed power plants to this area will likely increase the risk of degradation of resource values in nearby Class I areas. While these data were collected over a short time span, they indicate that establishment of an official AIRMoN site in the southwestern U.S. may be warranted.
机译：在2000年6月1日至2000年9月30日期间，在科罗拉多州Tellu-ride附近海拔3200 m的地方采样了32次降水事件。湿法沉积站点是根据“大气综合研究监测网络”（AIRMoN）的协议进行操作的，“大气综合研究监测网络”是国家大气沉积网络（NADP）的网络。在研究期间，碲化物位点1.41 kg ha〜（-1）的无机氮沉积量比附近的NADP位点高25％至50％。反过来，在这些NADP站点上的氮沉积与科罗拉多前沿山脉及其附近的高海拔站点相似，这些高海拔站点已显示受降雨中无机氮在大气中的沉积影响。发电厂的排放物很可能是圣胡安山区降雨中无机氮升高的主要部分。主成分分析（PCA）显示，发电厂排放的气体形成的溶质紧密聚集在一起，包括硝酸盐，铵，硫酸盐和氯化物。轨迹分析（包括向后和向前的轨迹）都表明，在碲化物站点的大量氮沉积导致形成降水事件的空气团直接经过了发电厂的上方或附近。我们的结果表明，在目前的降雨中无机氮的大气沉积速率下，圣胡安山脉及其附近的I类荒野地区面临生态系统受损的风险。将提议的电厂部署到该区域可能会增加附近I类区域的资源价值下降的风险。尽管这些数据是在很短的时间内收集的，但它们表明可能有必要在美国西南部建立AIRMoN官方站点。

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