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- Title
Using the tracer flux ratio method with flight measurements to estimate dairy farm CH<sub>4</sub> emissions in central California.
- Authors
Daube, Conner; Yacovitch, Tara I.; Roscioli, Joseph R.; Herndon, Scott C.; Conley, Stephen; Faloona, Ian C.; Arndt, Claudia
- Abstract
Tracer flux ratio methodology was applied to airborne measurements to quantify methane (CH4) emissions from two dairy farms in central California during the summer. An aircraft flew around the perimeter of each farm measuring downwind enhancements of CH4 and a tracer species released from the ground at a known rate. Estimates of CH4 emission rates from this analysis were determined for whole sites and sub-sources (animal housing, liquid manure lagoons). Whole-site CH4 flux rates for each farm, Dairy 1 (5,850 ± 793kgCH4day−1, 95% confidence interval) and Dairy 2 (3,699 ± 685kgCH4day−1, 95% confidence interval), closely resembled findings by established methods: ground-based tracer flux ratio and mass balance. Sub-source emission rates indicate a greater fraction of the whole-site emissions come from liquid manure management than animal housing activity, similar to bottom-up estimates. Despite differences in altitude, we observed that the tracer release method gave consistent results when using ground or air platforms. With no consideration of this analysis methodology during the experimental design, two groups were able to perform three methods quantifying CH4 emitted from these dairy farms over a few summer days.
- Subjects
CALIFORNIA; FLUX (Energy); EMISSIONS (Air pollution)
- Publication
Atmospheric Measurement Techniques Discussions, 2018, p1
- ISSN
1867-8610
- Publication type
Article
- DOI
10.5194/amt-2018-356