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- W4238483670 abstract "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 ± 793 kg CH4 day−1, 95 % confidence interval) and Dairy 2 (3,699 ± 685 kg CH4 day−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." @default.
- W4238483670 created "2022-05-12" @default.
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- W4238483670 date "2018-11-12" @default.
- W4238483670 modified "2023-10-01" @default.
- W4238483670 title "Using the tracer flux ratio method with flight measurements to estimate dairy farm CH<sub>4</sub> emissions in central California" @default.
- W4238483670 doi "https://doi.org/10.5194/amt-2018-356" @default.
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