Effects of whole-lake base addition on thermal stratification in three acidic Adirondack lakes
Effects of whole-lake base addition on thermal stratification in three acidic Adirondack lakes
复制标题
全湖碱添加对三个酸性阿迪朗达克湖热分层的影响
DOI：
10.1007/bf00283170
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
C. Driscoll
中科院分区：
文献类型：
--
作者：
P. Bukaveckas;C. Driscoll
研究了全湖碱添加对三个酸性阿迪朗达克湖泊热特性的影响。在无冰期间，从三个石灰湖和附近的一个参照湖收集了描述热分层模式的数据。分析了处理前和处理后的数据，以检验与湖水酸度降低相关的光衰减增加将显著影响热分层的假设。在治疗后的整个过程中，光穿透率显著降低。在两个浅水湖(小红莓湖和伍兹湖)，光衰减的增加伴随着亚极磁场加热率的下降。更深层热通量的减少导致水柱内更强的温度梯度和更大的热稳定性。伍兹湖维持了4年的中性pH。在整个过程中，与处理前相比，亚磁加热速率较低，温跃层深度较浅，热稳定性较高。更强的热层化，加上浮游植物产量的增加，导致亚磁耗氧量显著增加。红莓池塘的再酸化之后，光衰减率逐渐降低。光衰减的减少伴随着更深层次的热通量的增加和水柱热稳定性的降低。在施石灰后的3年内，小红莓池塘的光衰减、亚磁加热速率和热稳定性与处理前的测量值相当。
The effects of whole-lake base addition on the thermal characteristics of three acidic Adirondack lakes were investigated. Data describing patterns of thermal stratification were collected during the ice-free period from three limed lakes and from a nearby reference lake. Pre- and post-treatment data were analyzed to test the hypothesis that increases in light attenuation associated with reductions in lakewater acidity would significantly affect thermal stratification. Light penetration was significantly reduced throughout the post-treatment period. At the two shallow lakes (Cranberry Pond and Woods Lake), increases in light attenuation were accompanied by a decrease in hypolimnetic heating rates. Reductions in heat flux to deeper layers resulted in stronger temperature gradients within the water column and greater thermal stability. Woods Lake was maintained at a circumneutral pH for 4 yr. Throughout this period, hypolimnetic heating rates were lower, thermocline depth was shallower and thermal stability was higher relative to pre-treatment conditions. Stronger thermal stratification, coupled with increased phytoplankton production, resulted in a significant increase in hypolimnetic oxygen depletion. The reacidification of Cranberry Pond was followed by a gradual decrease in light attenuation. Decreases in light attenuation were accompanied by higher rates of heat flux to deeper layers and reductions in the thermal stability of the water column. Within 3 yr following liming, light attenuation, hypolimnetic heating rates and thermal stability in Cranberry Pond were comparable to values measured before treatment.