...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Water >Permafrost Boundary Shift in Western Siberia May Not Modify Dissolved Nutrient Concentrations in Rivers
【24h】

Permafrost Boundary Shift in Western Siberia May Not Modify Dissolved Nutrient Concentrations in Rivers

机译：西西伯利亚的多年冻土边界移动可能不会改变河流中溶解的营养物浓度

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

摘要

Identifying the landscape and climate factors that control nutrient export by rivers in high latitude regions is one of the main challenges for understanding the Arctic Ocean response to ongoing climate change. This is especially true for Western Siberian rivers, which are responsible for a significant part of freshwater and solutes delivery to the Arctic Ocean and are draining vast permafrost-affected areas most vulnerable to thaw. Forty-nine small- and medium-sized rivers (10?￠????100,000 km 2 ) were sampled along a 1700 km long N?￠????S transect including both permafrost-affected and permafrost-free zones of the Western Siberian Lowland (WSL) in June and August 2015. The N, P, dissolved organic and inorganic carbon (DOC and DIC, respectively), particular organic carbon (POC), Si, Ca, K, Fe, and Mn were analyzed to assess the role of environmental parameters, such as temperature, runoff, latitude, permafrost, bogs, lake, and forest coverage on nutrient concentration. The size of the watershed had no influence on nutrient concentrations in the rivers. Bogs and lakes retained nutrients whereas forests supplied P, Si, K, Ca, DIC, and Mn to rivers. The river water temperature was negatively correlated with Si and positively correlated with Fe in permafrost-free rivers. In permafrost-bearing rivers, the decrease in T northward was coupled with significant increases in PO 4 , P tot , NH 4 , pH, DIC, Si, Ca, and Mn. North of the permafrost boundary (61???° N), there was no difference in nutrient concentrations among permafrost zones (isolated, sporadic, discontinuous, and continuous). The climate warming in Western Siberia may lead to a permafrost boundary shift northward. Using a substituting space for time scenario, this may decrease or maintain the current levels of N, P, Si, K, Ca, DIC, and DOC concentrations in rivers of continuous permafrost zones compared to the present state. As a result, the export flux of nutrients by the small- and medium-sized rivers of the Western Siberian subarctic to the Arctic Ocean coastal zone may remain constant, or even decrease.
机译：确定高纬度地区河流控制养分输出的景观和气候因素，是了解北冰洋对当前气候变化的反应的主要挑战之一。对于西西伯利亚河尤其如此，西伯利亚河负责将大量淡水和溶质输送到北冰洋，并且正在排泄受冻土影响最广的受多年冻土影响的地区。沿着一条长1700公里的N？S？样带采样了49条中小型河流（10 ??????? 100,000 km 2），包括该地区受多年冻土影响的地区和没有多年冻土的地区。西伯利亚低地（WSL）于2015年6月和8月。分析了氮，磷，溶解的有机碳和无机碳（分别为DOC和DIC），特定的有机碳（POC），Si，Ca，K，Fe和Mn。评估环境参数（例如温度，径流，纬度，多年冻土，沼泽，湖泊和森林覆盖率）对养分浓度的作用。分水岭的大小对河流中的养分含量没有影响。沼泽和湖泊保留了养分，而森林则向河流提供了磷，硅，钾，钙，DIC和锰。在无多年冻土的河流中，河水温度与硅呈负相关，与铁呈正相关。在含多年冻土的河流中，T向北的下降与PO 4，P tot，NH 4，pH，DIC，Si，Ca和Mn的显着增加有关。在多年冻土边界以北（61°C），在多年冻土区（隔离，零星，不连续和连续）之间养分浓度没有差异。西伯利亚西部的气候变暖可能导致永久冻土边界向北移动。如果使用替代空间作为时间情景，则与当前状态相比，这可能会降低或维持当前连续多年冻土带河流中N，P，Si，K，Ca，DIC和DOC浓度的水平。结果，西伯利亚次北极的中小河流到北冰洋沿海地区的养分出口通量可能保持恒定，甚至下降。

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