ELA LTER Chemistry

Lake 239 is one of five reference lakes at the Experimental Lakes Area monitored as control lakes for other manipulation experiments. In recent years, the value of these lakes as whole ecosystem LTER observatories has become clear as signals arise from natural (forest fires, beaver dams, extreme weather) and anthropogenic (long-range pollutant deposition, climate change) sources.239号湖是实验湖区（Experimental Lakes Area）的五个参考湖泊之一，被作为其他操控实验的对照湖泊开展监测。近年来，这些湖泊作为完整生态系统长期生态研究（Long-Term Ecological Research, LTER）观测站的价值愈发凸显，源自自然因素（森林火灾、海狸坝、极端天气）与人为因素（远距离污染物沉降、气候变化）的信号已逐步显现。