Key Laboratory of Marine Environment and Ecology, Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
Center for Ocean and Climate Research, First Institute of Oceanography, SOA, Qingdao 266061, China.
Mar Pollut Bull. 2017 Nov 15;124(1):449-458. doi: 10.1016/j.marpolbul.2017.07.055. Epub 2017 Aug 3.
Aerobic respiration and nitrification are important processes for dissolved inorganic nitrogen (DIN) composition change and CO production in human-perturbed coastal waters. On-site incubations and field investigations were conducted in the eastern Jiaozhou Bay, a high-urbanization region, from May to August 2014. Results show that aerobic respiration rates reached 15.58μmolOLd, and NH and NO oxidation rates were 0.53 and 0.13μmolNLd, respectively, in the human-perturbed northeastern area. The intense aerobic respiration there contributed to high-concentration NH, and meanwhile caused a pH decrease of 0.042units and a pCO increase of 166μatm per day. Moreover, the linear relationship between excess CO and apparent oxygen utilization suggested that the excess CO in the entire eastern Jiaozhou Bay was mainly from the aerobic respiration. This study may help us better understand the role of aerobic respiration in DIN composition and CO sink/source pattern in coastal waters.
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