Long-term lake dissolved oxygen and temperature data, 1941-2018

The concentration of oxygen dissolved in water regulates many aspects of aquatic ecosystems, including habitat suitability for biota, greenhouse gas emissions, nutrient cycling, and metal toxicity. However, little is known about how dissolved oxygen (DO) concentrations in lakes are changing through time. The solubility of oxygen in water declines with increasing water temperatures, but other temperature-sensitive processes may suppress or amplify trends through time, making long-term observations essential to understanding DO dynamics and trends. This dataset includes measurements of dissolved oxygen and temperature from greater than 400 widely geographically-distributed lakes, as well as a suite of associated measurements in or around many of the lakes, including watershed land use, water clarity, limiting nutrient concentrations, and chlorophyll concentrations. Analysis of these data reveal widespread losses in dissolved oxygen through time in both surface and deep waters.

水中溶解氧(DO)的浓度调控着水生生态系统的诸多方面，涵盖生物群落的栖息地适宜性、温室气体排放、养分循环以及金属毒性等环节。然而，目前学界对湖泊中溶解氧浓度随时间的变化规律尚知之甚少。氧气在水中的溶解度随水温升高而降低，但其他温度敏感过程可能会抑制或放大这类随时间演变的趋势，因此长期观测对于理解溶解氧的动态变化与演变趋势至关重要。本数据集包含了400余个地理分布广泛的湖泊的溶解氧与温度实测数据，同时配套收录了众多湖泊内部或周边的多项关联测量指标，包括流域土地利用、水体透明度、限制性养分浓度以及叶绿素浓度。对这些数据的分析表明，无论表层还是深层水体，溶解氧均出现了大范围的随时间衰减现象。