Isotopic signatures of methane emissions from dairy farms in California's San Joaquin Valley
Data files
Feb 07, 2022 version files 6.23 MB
-
_2018-09-19__york_data.csv
71.71 KB
-
_2018-09-20__york_data.csv
35.84 KB
-
_2018-09-21__york_data.csv
13.71 KB
-
_2019-03-25__york_data.csv
106.10 KB
-
_2019-03-26__york_data.csv
61.76 KB
-
_2019-03-28__york_data.csv
56.26 KB
-
_2019-06-17__york_data.csv
21.91 KB
-
_2019-06-18__york_data.csv
79.60 KB
-
_2019-06-19__york_data.csv
196.11 KB
-
_2019-06-20__york_data.csv
81.32 KB
-
_2019-06-21__york_data.csv
85.08 KB
-
_2019-06-26__york_data.csv
57.44 KB
-
_2019-09-12__york_data.csv
90.78 KB
-
_2019-09-13__york_data.csv
137.74 KB
-
_2019-09-14__york_data.csv
29.65 KB
-
_2020-01-15__york_data.csv
53.78 KB
-
_2020-01-16__york_data.csv
71.28 KB
-
_2020-01-17__york_data.csv
89.01 KB
-
2018-09-21_171812_172336_15s_NOCO_hotspot_avg.csv
6.34 KB
-
2018-09-21_180501_180930_15s_NOCO_hotspot_avg.csv
5.43 KB
-
2019-03-24_132801_133200_15s_CO_hotspot_avg.csv
5.93 KB
-
2019-03-24_141659_142334_15s_CO_hotspot_avg.csv
9.70 KB
-
2019-03-24_175301_175513_15s_CO_hotspot_avg.csv
3.49 KB
-
2019-06-24_160641_161205_15s_CO_hotspot_avg.csv
7.99 KB
-
2019-06-25_140200_140530_15s_CO_hotspot_avg.csv
5.33 KB
-
2019-06-25_141454_142028_15s_CO_hotspot_avg.csv
8.31 KB
-
2019-06-25_151700_151830_15s_CO_hotspot_avg.csv
2.52 KB
-
2019-06-25_155140_155350_15s_CO_hotspot_avg.csv
3.55 KB
-
2019-06-25_171130_171500_15s_CO_hotspot_avg.csv
5.33 KB
-
chamber_measurements.csv
3.42 KB
-
cow_breath_measurements.csv
4.06 KB
-
Feed_Analysis_Reference_Test_Site.xlsx
16.01 KB
-
final_isotopic_signatures.xlsx
21.63 KB
-
met_15sec_avg_2018-09-21_171812_172336.csv
3.81 KB
-
met_15sec_avg_2018-09-21_180501_180930.csv
3.20 KB
-
met_15sec_avg_2019-03-24_132801_133200.csv
2.84 KB
-
met_15sec_avg_2019-03-24_141659_142334.csv
4.72 KB
-
met_15sec_avg_2019-03-24_175301_175513.csv
1.64 KB
-
met_15sec_avg_2019-06-24_160641_161205.csv
3.86 KB
-
met_15sec_avg_2019-06-25_140200_140530.csv
2.55 KB
-
met_15sec_avg_2019-06-25_141454_142028.csv
4.03 KB
-
met_15sec_avg_2019-06-25_151700_151830.csv
1.15 KB
-
met_15sec_avg_2019-06-25_155140_155350.csv
1.67 KB
-
met_15sec_avg_2019-06-25_171130_171500.csv
2.55 KB
-
picarro-G2210i-20190325_final.csv
2.83 MB
-
picarro-G2210i-20190326_final.csv
1.87 MB
-
README.txt
25.94 KB
-
Reference_Test_Site_Feed_Composition.xlsx
22.24 KB
Abstract
In this study, we present seasonal atmospheric measurements of δ13CCH4 from dairy farms in the San Joaquin Valley of California. We used δ13CCH4 to characterize emissions from enteric fermentation by measuring downwind of cattle housing (e.g., freestall barns, corrals) and from manure management areas (e.g., anaerobic manure lagoons) with a mobile platform equipped with cavity ring-down spectrometers. Across seasons, the δ13CCH4 from enteric fermentation source areas ranged from -69.7 ± 0.6 per mil (‰) to -51.6 ± 0.1‰ while the δ13CCH4 from manure lagoons ranged from -49.5 ± 0.1‰ to -40.5 ± 0.2‰. Measurements of δ13CCH4 of enteric CH4 suggest a greater than 10‰ difference between cattle production groups in accordance with diet. Isotopic signatures of CH4 were used to characterize enteric and manure CH4 from downwind plume sampling of dairies. Our findings show that δ13CCH4 measurements could improve the attribution of CH4 emissions from dairy sources at scales ranging from individual facilities to regions and help constrain the relative contributions from these different sources of emissions to the CH4 budget.