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. Tracer flux ratio methodology was applied to airbornemeasurements to quantify methane (CH4) emissions from two dairy farmsin central California during the summer. An aircraft flew around theperimeter of each farm measuring downwind enhancements of CH4 and atracer species released from the ground at a known rate. Estimates ofCH4 emission rates from this analysis were determined for whole sitesand major sources within a site (animal housing and liquid manure lagoons).Whole-site CH4 flux rates for each farm, Dairy 1 (6108±821 kg CH4 d−1,95 % confidence interval) and Dairy 2 (4018±456 kg CH4 d−1,95 % confidence interval), closely resembledfindings by established methods: ground-based tracer flux ratio and massbalance. Individual source emission rates indicate a greater fraction of thewhole-site emissions come from liquid manure management than animal housingactivity, similar to bottom-up estimates. Despite differences in altitude,we observed that the tracer release method gave consistent results whenusing ground or air platforms.

atmospheric measurement techniques

Using the tracer flux ratio method with flight measurements to estimate dairy farm CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; emissions in central California