ENVIRONMENTAL SYSTEMS RESEARCH
Online ISSN : 1884-8117
Print ISSN : 0915-0390
ISSN-L : 0915-0390
Production of nitrous oxide in estuaries and coastal area
Masahiro IMAMURATetsuya KUSUDA
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JOURNAL FREE ACCESS

1998 Volume 26 Pages 151-156

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Abstract
The estuary and its adjacent coastal area is a hot spot acting as afilter as well as a reactor between land and ocean. The functions are associated with several processes suchas biological, biochemical, geochemical and physical ones. Of the biological process, nitrification anddenitrification occur both near the surface of sediments and in water column. Nitrous oxide (N20), greenhouseeffect gas, is one of the intermediates, in the nitrification and denitrification processes. The gasinthe atmosphere is low in concentration, about 320ppbv at present it, however, has been increasing by 0.8 ppbv annualy.
Distributions of N20 and other nutrients were surveyed in Hakata Bay in 1994 and 1995. N20 concentration rose close to the outfalls of treated waste water and up to 20μg/1 in the middle of water column inthe bay
Nutrient loading with treated waste water was very high, especially, NO3-N wasmore than 1.0t/day. N2O consentration in water surface ranged from 5.0 to 38μg, /l, oversaturated atalmost stations. N2O emission rate into the atmosphere from Hakata Bay reached 16t/day.
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© by Japan Society of Civil Engineers
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