We report the first airborne detection of CO 2 degassing from diffuse volcanic sources. Airborne measurement of diffuse CO 2 degassing offers a rapid alternative for monitoring CO 2 emission rates at Mammoth Mountain. CO 2 concentrations, temperatures, and barometric pressures were measured at ∼2,500 GPS‐referenced locations during a one‐hour, eleven‐orbit survey of air around Mammoth Mountain at ∼3 km from the summit and altitudes of 2,895–3,657 m. A volcanic CO 2 anomaly 4–5 km across with CO 2 levels ∼1 ppm above background was revealed downwind of tree‐kill areas. It contained a 1‐km core with concentrations exceeding background by >3 ppm. Emission rates of ∼250 t d −1 are indicated. Orographic winds may play a key role in transporting the diffusely degassed CO 2 upslope to elevations where it is lofted into the regional wind system.
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Gerlach et al. (1999) studied this question.
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