The amount of CO₂ exiting headwater streams through degassing plays an important role in the global carbon cycle, yet quantification of CO₂ degassing remains challenging because of the morphology of headwater streams and because of uncertainty about whether floating or suspended chambers provide valid measurements in moving water. We show that experiments using large and small floating chambers in flowing water over a moderate range of water velocities (0.13–0.23 m s⁻¹) in a laboratory flume resulted in similar k₆₀₀s to published field measurements with similar water velocities. We confirmed the flume experiments with paired stirred-still beaker experiments, where resulting k₆₀₀s fell within the extrapolated trend of the flume experiments. We propose that the floating chambers can provide good estimates of CO₂ degassing, particularly in shallow, low-velocity, morphologically complex headwater streams, permitting quantification of this important contributor to the global carbon cycle.

通过脱气排出的CO ₂的量在全球碳循环中起着重要的作用，但是由于上游水流的形态以及由于浮动室或悬浮室能否在移动过程中提供有效的测量值的不确定性，CO ₂脱气的量化仍然具有挑战性水。我们表明，在实验室水槽中使用中等大小的水速范围（0.13-0.23 ms ^-1）的流动水中使用大型和小型浮动腔室进行的实验得出的k ₆₀₀ s与已发布的具有类似水速的现场测量结果相似。我们通过配对的搅拌-烧杯实验确认了水槽实验，结果k ₆₀₀落在水槽实验的外推趋势之内。我们建议浮动腔室可以提供对CO ₂脱气的良好估算，尤其是在浅，低速，形态复杂的源头水流中，从而可以量化这一对全球碳循环的重要贡献。