There is growing concern regarding the prospect for global
climate change and potential health and environmental effects of
increasing atmospheric concentrations of trace gases. Nitrous
oxide (N20) and nitric oxide (NO) are among the trace gases of
greatest concern. N•_O plays two important roles in global change
processes. First, it contributes to the depletion of stratospheric
ozone [Cicerone, 1987] which protects the biosphere from the
harmful effects of solar ultraviolet radiation [Crutzen, 1981].
Second, relative to other greenhouse gases the radiative forcing
by N•_O is increasing [Shine et al., 1990] and is calculated to
currently contribute about 5% of the anthropogenic greenhouse
effect. N20 emissions from humid tropical forests account for 20-
50% of all global sources of atmospheric N20 [Davidson, 1991 ].
Because the atmospheric lifetime of N•_O is 110-170 years [Ko et
at., 1991], current emissions will affect the atmosphere for a long
time to come. The global budget of N•_O shows a significant
imbalance between the known rate of destruction in the
stratosphere and the estimated rates of natural and anthropogenic
production in soils and the ocean.
Nitric oxide (NO) plays a critical role in regulating the oxidant
balance of the troposphere [Crutzen, 1983]. The major sources of
There is growing concern regarding the prospect for globalclimate change and potential health and environmental effects ofincreasing atmospheric concentrations of trace gases. Nitrousoxide (N20) and nitric oxide (NO) are among the trace gases ofgreatest concern. N•_O plays two important roles in global changeprocesses. First, it contributes to the depletion of stratosphericozone [Cicerone, 1987] which protects the biosphere from theharmful effects of solar ultraviolet radiation [Crutzen, 1981].Second, relative to other greenhouse gases the radiative forcingby N•_O is increasing [Shine et al., 1990] and is calculated tocurrently contribute about 5% of the anthropogenic greenhouseeffect. N20 emissions from humid tropical forests account for 20-50% of all global sources of atmospheric N20 [Davidson, 1991 ].Because the atmospheric lifetime of N•_O is 110-170 years [Ko etat., 1991], current emissions will affect the atmosphere for a longtime to come. The global budget of N•_O shows a significantimbalance between the known rate of destruction in thestratosphere and the estimated rates of natural and anthropogenicproduction in soils and the ocean.Nitric oxide (NO) plays a critical role in regulating the oxidantbalance of the troposphere [Crutzen, 1983]. The major sources of
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