Diffuse emission of magmatic CO₂ is one of the main indicators of volcanic unrest at Mammoth Mountain, but the presence of deep seasonal snowpack at the site has hindered year-round CO₂ flux observations. A permanent eddy covariance station was established at the largest area of diffuse CO₂ degassing on Mammoth Mountain (Horseshoe Lake tree kill) that measured CO₂ fluxes (F_c) and meteorological parameters on a half-hourly basis. From July 22, 2014 to May 24, 2020, F_c ranged from −35 to 10,546 g m⁻² d⁻¹. F_c decreased on average by 53% over the study period, tracking the long-term decline in CO₂ emissions following the last major increase that occurred at the Horseshoe Lake tree kill area from 2009 to 2011. Statistical and spectral analyses were applied to the F_c and ancillary meteorological parameter time series to understand (1) relationships between these parameters, (2) their dominant periodicities, and (3) changes in F_c that may be unexplained by meteorological forcing. Variations in detrended F_c (F_cdt) were most strongly correlated with wind direction and atmospheric temperature, followed by atmospheric pressure on diurnal to annual time scales, but wind direction likely exerted the most direct control on F_cdt. Comparison of the smoothed (180-d span) F_cdt time series to the time series of average-daily snow water equivalent measured ~1 km away suggested that snowpack may have suppressed CO₂ emissions. No evidence of a change in CO₂ emissions related to the last major seismic swarm beneath Mammoth Mountain on February 2–18, 2014 was observed.

岩浆CO _{2 的}扩散排放是猛犸山火山动荡的主要指标之一，但该地点存在较深的季节性积雪，阻碍了全年的CO ₂通量观测。在猛犸山（马蹄湖砍树）上最大的扩散 CO ₂脱气区域建立了一个永久性涡流协方差站，每半小时测量一次 CO ₂通量（F _c）和气象参数。从2014年7月22日到2020年5月24日，F _c范围从-35到10,546 gm ^-2 d ^-1。˚F _ç在研究期间平均下降了 53%，跟踪了2009 年至 2011 年马蹄湖树木杀戮区上一次大幅增加后 CO ₂排放量的长期下降。对F _c应用了统计和光谱分析和辅助气象参数时间序列，以了解 (1) 这些参数之间的关系，(2) 它们的主要周期性，以及 (3)可能无法用气象强迫解释的F _c变化。去趋势F _c ( F _cdt) 与风向和大气温度的相关性最强，其次是昼夜到年时间尺度上的大气压力，但风向可能对F _cdt施加了最直接的控制。将平滑的（180 天跨度）F _cdt时间序列与约 1 公里外测量的平均每日雪水当量的时间序列进行比较，表明积雪可能抑制了 CO ₂排放。没有观察到与 2014 年 2 月 2 日至 18 日猛犸山下最后一个主要地震群相关的CO ₂排放量变化的证据。