• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Winter-time climatic control on dissolved organic carbon export and surface water chemistry in an Adirondack forested watershed
【24h】

Winter-time climatic control on dissolved organic carbon export and surface water chemistry in an Adirondack forested watershed

机译：阿迪朗达克森林流域冬季对溶解有机碳出口和地表水化学的气候控制

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

Although most of forested watersheds in temperate and boreal regions are snow-covered for a substantial portion of the year, responses of biogeochemical processes under the snow pack to climatic fluctuations are poorly understood. We investigated responses of dissolved organic carbon (DOC) and surface water chemistry in stream and lake discharge waters draining the Arbutus Lake Watershed in the Adirondacks of New York State to climatic fluctuations during the snow-covered months from December through April. Interannual variability in stream discharge corresponded to changes in air temperature and snow pack depth across the winter months. Concentrations of DOC in stream water draining a subcatchment showed immediate positive responses to rising temperatures and subsequent increases in runoff during most snowmelt events. Increases in DOC concentrations usually coincided with decreases in pH and increases in total aluminum (AI) concentrations, while the correlations between concentrations of DOC and SO42- or base cations were negative. Although changes in air temperature, snow pack depth, and runoff were all significantly correlated with stream water concentrations of major solutes, stepwise linear regression found that runoff was the best predictor of solute concentrations. Results of stepwise linear regression with long-term monthly monitoring data collected at the lake outlet showed weaker but still consistent climatic effects on interannual variations in concentrations of DOC and other solutes. Over the 17 winter periods from December 1983 through April 2000, changes in seasonal average concentrations of DOC, H+, and Al in lake discharge generally corresponded to interannual variations in temperature, precipitation, and runoff, while SO42- and base cations displayed an opposite trend. The results suggest that snowmelt-mediated DOC responses to temperature fluctuations during the winter months might offset increases in the surface water pH caused by decreasing acidic deposition and pose a potential hazard of Al toxicity in surface waters.
机译：尽管温带和北方地区大部分森林流域在一年的大部分时间都被积雪覆盖，但人们对积雪下生物地球化学过程对气候波动的反应知之甚少。我们调查了从12月至4月在积雪覆盖的几个月内，纽约州阿迪朗达克郡的杨梅湖流域排水的溪流和湖泊排放水中溶解有机碳（DOC）和地表水化学对气候波动的响应。溪流排放量的年际变化对应于整个冬季的气温和积雪深度的变化。在大部分融雪事件中，流向子汇水面积的DOC中的DOC浓度立即显示出对温度上升和径流增加的积极响应。 DOC浓度的增加通常与pH值降低和总铝（AI）浓度增加同时发生，而DOC浓度与SO42-或碱金属阳离子之间的相关性为负。尽管气温，积雪深度和径流的变化都与主要溶质的溪流水浓度显着相关，但逐步线性回归发现径流是溶质浓度的最佳预测指标。逐步线性回归的结果与在湖泊出口处收集的长期每月监测数据表明，对DOC和其他溶质浓度的年际变化的气候影响较弱，但仍保持一致。在1983年12月至2000年4月的17个冬季，湖水排放中DOC，H +和Al的季节性平均浓度变化通常与温度，降水和径流量的年际变化相对应，而SO42-和碱性阳离子则呈现相反的趋势。 。结果表明，融雪介导的DOC对冬季温度波动的响应可能抵消了由酸性沉积物减少引起的地表水pH值升高，并潜在地危害了地表水中Al的毒性。

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