Effects of temperature on nitrous oxide (N2O) emission from intensive aquaculture system.
This study examines the effects of temperature on nitrous oxide (N2O) emissions in a bench-scale intensive aquaculture system rearing Koi fish. The water temperature varied from 15 to 24 °C at interval of 3 °C. Both volumetric and specific rate for nitrification and denitrification declined as the temperature decreased. The concentrations of ammonia and nitrite, however, were lower than the inhibitory level for Koi fish regardless of temperature. The effects of temperature on N2O emissions were significant, with the emission rate and emission factor increasing from 1.11 to 1.82 mg N2O-N/d and 0.49 to 0.94 mg N2O-N/kg fish as the temperature decreased from 24 to 15 °C. A global map of N2O emission from aquaculture was established by using the N2O emission factor depending on temperature. This study demonstrates that N2O emission from aquaculture is strongly dependent on regional water temperatures as well as on fish production.
Department of Environmental Engineering, College of Science and Technology, Korea University, Sejong 339-700, Republic of Korea.
Shukra Raj
SR
Paudel
Program in Environmental Technology and Policy, Korea University, Sejong 339-700, Republic of Korea.
Ohkyung
O
Choi
Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA.
Samir Kumar
SK
Khanal
Department of Earth and Environmental Engineering, Columbia University, 500 West 120th Street, New York, NY 10027, USA.
Kartik
K
Chandran
Department of Environmental Engineering, College of Science and Technology, Korea University, Sejong 339-700, Republic of Korea; Program in Environmental Technology and Policy, Korea University, Sejong 339-700, Republic of Korea.
Sungpyo
S
Kim
Department of Environmental Engineering, College of Science and Technology, Korea University, Sejong 339-700, Republic of Korea; Program in Environmental Technology and Policy, Korea University, Sejong 339-700, Republic of Korea. Electronic address: jaewoo@korea.ac.kr.
Jae Woo
JW
Lee
D000393:Air Pollutants / Q000032:analysis*; D017756:Aquaculture; D004784:Environmental Monitoring; D058465:Nitrification; D009609:Nitrous Oxide / Q000032:analysis*; D013696:Temperature
D000393:Air Pollutants; D009609:Nitrous Oxide
Aquaculture system; Denitrification; Greenhouse gas (GHG); Nitrification; Nitrous oxide (N(2)O); Temperature