...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Canadian water resources journal >Elevation-dependent warming of streams in mountainous regions: implications for temperature modeling and headwater climate refugia
【24h】

Elevation-dependent warming of streams in mountainous regions: implications for temperature modeling and headwater climate refugia

机译：Elevation-dependent warming of streams in mountainous regions: implications for temperature modeling and headwater climate refugia

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

Climate change is warming stream temperatures with significant implications for species thatrequire cold temperatures to persist. These species often rely on headwater habitats in mountainousregions where elevation gradients in hydroclimatic conditions may induce differentialpatterns of long-term warming that affect the resistance of refugia. Forecasts from mechanisticand statistical stream temperature models diverge regarding whether this elevation dependencewill cause above- or below-average warming in headwaters during warm summer periods, sowe examined monitoring records for stream temperature (n=271), air temperature (n=690),and stream discharge (n=131) across broad elevation gradients in a mountainous region ofwestern North America to better understand potential future trends. Over a 40-year period characterizedby rapid climate change from 1976–2015, air temperature stations exhibited belowaveragewarming rates at high elevations while stream discharge declined at above averagerates. Between climatically extreme years that involved summer air temperature increases >5 ℃and discharge declines >70, temperatures in high-elevation streams exhibited below averageincreases but otherwise showed negligible elevation dependence during intermediate climateyears. In a subsequent example, it was demonstrated that elevation dependent stream warminghas a minor effect on the amount of thermal habitat loss relative to the average water temperatureincrease within a mountain river network. We conclude that predictions of above averagewarming effects on headwater organisms for this region may be overly pessimistic and discussreasons why different types of temperature models make divergent forecasts. Several researchareas warrant greater attention, including descriptions of elevation-dependent patterns in otherregions for comparative purposes, examination of long-term stream temperature records tounderstand how sensitivity to climate forcing may be evolving, use of new data sources to betterrepresent key processes in temperature models across broad areas, and development ofhybrid models that integrate the best attributes of mechanistic and statistical approaches.

著录项

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