| Summary: | This dataset has been analyzed in a manuscript submitted to Limnology and Oceanography Letters titled: Changing ice-out phenology increases hypolimnetic oxygen despite regional warming in small Arctic lakes. The dataset includes data for analysis of thermal structure and dissolved oxygen responses to seasonal variability. Here, we used long-term monitoring data from Arctic lakes to investigate a) the relative effects of inter-annual variability in ice-out timing and weather conditions (air temperature, wind speed) on lake thermal structure and b) how ice-out driven variability in thermal structure affects summer dissolved oxygen (DO) concentrations. The aim was to refine our understanding of the mechanisms by which ice phenology affects lake ecosystems and disentangle different seasonal signals reflected in interannual variability of lake responses. We analyzed temperature and DO profiles collected intermittently over the past 20 years from 13 oligotrophic lakes in West Greenland. Our results emphasize the importance of ice-out timing and its interactive effects with air temperatures. We found that when ice-out happens earlier in West Greenland lakes, deepwaters are warmer but also contain higher oxygen concentrations during summer which is likely a consequence of prolonged spring mixing that is enabled by relatively cooler temperatures when ice-out happens early. Below we included datasets of a) weather from 1941-2022 in West Greenland , b) lake characteristics and coordinates, c) thermal structure metrics from vertical profiles taken throughout 2011-2022, d) thermal structure metrics from thermistor data collected intermittently since 2003, and e) specific conductivity, and concentrations of dissolved oxygen and dissolved organic carbon in epilimnion and hypolimnion.
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