TY - GEN
T1 - Emissions of greenhouse gases from naturally ventilated free-stall dairy barns
AU - Joo, Hung Soo
AU - Ndegwa, Pius M.
AU - Heber, Albert J.
AU - Ni, Ji Qin
AU - Bogan, W. W.
AU - Ramirez-Dorronsoro, Juan Carlos
AU - Cortus, Erin
PY - 2013
Y1 - 2013
N2 - Greenhouse gases (GHG) emissions from two naturally-ventilated free-stall dairy barns were measured continuously during a three-month study period (May, July and September, 2009). Barn 1 (B1) housed 400 fresh cows, while Barn 2 (B2) housed 850 lactating cows. Air samples of inlet and outlet of the barns for measurement of GHG (carbon dioxide, nitrous oxide and methane) concentrations were delivered to a photoacoustic gas analyzer (INNOVA model 1412) using a custom-made gas sampling system. Ventilation rates in the barns were determined using three dimensional ultrasonic anemometers mounted on air inlets and outlets. Emissions of carbon dioxide averaged 23.14 in B1 and 18.53kg-CO 2/cow/d in B2, respectively. Methane emissions averaged 326.5 in B1 and 374.5 g-CH4/cow/d in B2. The respective emissions of nitrous oxide in B1 and B2 were 16.00 and 7.86 g-N2O/cow/d, respectively. Emissions of carbon dioxide and methane in both barns were indicated the similar levels. On the other hand, the significant difference in nitrous oxide emissions observed in the two barns was explained by management differences. The half of Barn 1 also did not have stalls and animals on this pen thus rested on dirt. Cows' urine deposited on this dirt was thus rarely removed and explained the significantly higher emissions of N2O from this barn (B1). The correlation between carbon dioxide and nitrous oxide was considerably higher than that with methane emissions, R2 ranged from 0.82 to 0.98.
AB - Greenhouse gases (GHG) emissions from two naturally-ventilated free-stall dairy barns were measured continuously during a three-month study period (May, July and September, 2009). Barn 1 (B1) housed 400 fresh cows, while Barn 2 (B2) housed 850 lactating cows. Air samples of inlet and outlet of the barns for measurement of GHG (carbon dioxide, nitrous oxide and methane) concentrations were delivered to a photoacoustic gas analyzer (INNOVA model 1412) using a custom-made gas sampling system. Ventilation rates in the barns were determined using three dimensional ultrasonic anemometers mounted on air inlets and outlets. Emissions of carbon dioxide averaged 23.14 in B1 and 18.53kg-CO 2/cow/d in B2, respectively. Methane emissions averaged 326.5 in B1 and 374.5 g-CH4/cow/d in B2. The respective emissions of nitrous oxide in B1 and B2 were 16.00 and 7.86 g-N2O/cow/d, respectively. Emissions of carbon dioxide and methane in both barns were indicated the similar levels. On the other hand, the significant difference in nitrous oxide emissions observed in the two barns was explained by management differences. The half of Barn 1 also did not have stalls and animals on this pen thus rested on dirt. Cows' urine deposited on this dirt was thus rarely removed and explained the significantly higher emissions of N2O from this barn (B1). The correlation between carbon dioxide and nitrous oxide was considerably higher than that with methane emissions, R2 ranged from 0.82 to 0.98.
KW - Correlation between carbon dioxide and nitrous oxide emissions
KW - Greenhouse (GHG) gas emissions
KW - Naturally ventilated dairy barn
KW - On-site and real-time continuous monitoring
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M3 - Conference contribution
AN - SCOPUS:84881628932
SN - 9781627486651
T3 - American Society of Agricultural and Biological Engineers Annual International Meeting 2013, ASABE 2013
SP - 1281
EP - 1292
BT - American Society of Agricultural and Biological Engineers Annual International Meeting 2013, ASABE 2013
PB - American Society of Agricultural and Biological Engineers
T2 - American Society of Agricultural and Biological Engineers Annual International Meeting 2013
Y2 - 21 July 2013 through 24 July 2013
ER -