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121.
  • Winterdahl, Mattias, et al. (författare)
  • Intra-annual variability of organic carbon concentrations in running waters : Drivers along a climatic gradient
  • 2014
  • Ingår i: Global Biogeochemical Cycles. - 0886-6236 .- 1944-9224. ; 28:4, s. 451-464
  • Tidskriftsartikel (refereegranskat)abstract
    • Trends in surface water dissolved organic carbon (DOC) concentrations have received considerable scientific interest during recent decades. However, intra-annual DOC variability is often orders of magnitude larger than long-term trends. Unraveling the controls on intra-annual DOC dynamics holds the key to a better understanding of long-term changes and their ecological significance. We quantified and characterized intra-annual DOC variability and compared it with long-term DOC trends in 136 streams and rivers, varying in size and geographical characteristics, across a 1400km latitudinal gradient during 2000-2010. Discharge, temperature, and month of the year were the most significant predictors of intra-annual DOC variability in a majority of the running waters. Relationships between DOC, discharge, and temperature were, however, different along a mean annual temperature (MAT) gradient. Running waters with low MAT generally displayed positive DOC-discharge correlations whereas the relationships in sites with higher MAT were more variable. This reflected contrasting relationships between temperature and discharge with discharge positively correlated with temperature in cold areas, while it was negatively correlated with temperature in catchments with higher MAT. Sites where flow, temperature, and month were poorly related to intra-annual DOC dynamics were large catchments or sites with extensive upstream lake cover. DOC trends were generally much smaller than intra-annual DOC variability and did not show any north-south gradient. Our findings suggest that DOC in running waters could respond to a changing climate in ways not predictable, or even discernible, from extrapolation of recent interannual trends. Key Points Large-scale characterization of intra-annual DOC dynamics in running waters Discharge, temperature and month are significant predictors of DOC variability Shifting patterns in DOC dynamics along a 1400 km climatic gradient
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122.
  • Woolway, R. Iestyn, et al. (författare)
  • Substantial increase in minimum lake surface temperatures under climate change
  • 2019
  • Ingår i: Climatic Change. - : Springer. - 0165-0009 .- 1573-1480. ; 155:1, s. 81-94
  • Tidskriftsartikel (refereegranskat)abstract
    • The annual minimum of lake surface water temperature influences ecological and biogeochemical processes, but variability and change in this extreme have not been investigated. Here, we analysed observational data from eight European lakes and investigated the changes in annual minimum surface water temperature. We found that between 1973 and 2014, the annual minimum lake surface temperature has increased at an average rate of + 0.35 degrees Cdecade(-1), comparable to the rate of summer average lake surface temperature change during the same period (+ 0.32 degrees C decade(-1)). Coherent responses to climatic warming are observed between the increase in annual minimum lake surface temperature and the increase in winter air temperature variations. As a result of the rapid warming of annual minimum lake surface temperatures, some of the studied lakes no longer reach important minimum surface temperature thresholds that occur in winter, with complex and significant potential implications for lakes and the ecosystem services that they provide.
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123.
  • Woolway, R. Iestyn, et al. (författare)
  • Winter inverse lake stratification under historic and future climate change
  • 2021
  • Ingår i: Limnology and Oceanography Letters. - 2378-2242.
  • Tidskriftsartikel (refereegranskat)abstract
    • Millions of lakes inversely stratify during winter. Seemingly subtle variations in the duration of winter stratification can have major ecological effects by, for example, altering the vertical distribution of oxygen and nutrients in lakes. Yet, the influence of climate change on winter stratification has been largely unexplored. To fill this knowledge gap, here we used a lake-climate model ensemble to investigate changes in winter stratification from 1901 to 2099 across 12,242 representative lakes situated throughout the Northern Hemisphere. By the end of the 21st century, winter stratification duration is projected to shorten by an average of 18.5–53.9 d under Representative Concentration Pathways (RCPs) 2.6–8.5. Projected changes are faster in warmer geographical regions, in which 35–69% of lakes will no longer inversely stratify by 2070–2099 under RCPs 2.6–8.5. This shortening and loss of winter stratification will likely have numerous implications for lakes, including the misalignment of lifecycle events causing shifts in biodiversity.
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