In:
Environmental Research: Climate, IOP Publishing, Vol. 1, No. 2 ( 2022-12-01), p. 025010-
Abstract:
Nitrous oxide (N 2 O), a major greenhouse gas and ozone-depleting agent, is generated over land mostly from two key biochemical processes—nitrification and denitrification. Nitrifying and denitrifying N 2 O production occurs preferably under alternative oxic and anoxic conditions, which are closely linked with variations in water filled soil pores, and thus indirectly with precipitation. We show here that the interannual anomalies in the annual growth rate of the global land N 2 O emissions are significantly ( P 〈 0.001) correlated with precipitation anomalies, with an overall sensitivity ( α PRE , changes of land N 2 O emission variations per precipitation anomalies) of 2.50 ± 0.98 Tg N 2 O–N per 100 mm of precipitation across the global land (1998–2016). The sensitivity ( α PRE ) and precipitation-driven N 2 O anomalies increased during 1998–2016, partly due to increased nitrogen inputs to agricultural lands and enhanced precipitation anomalies. Spatially, we find that the α PRE increases with aridity. We predict a larger α PRE under future climate conditions (with radiative forcing levels of 4.5, 7.0 and 8.5 Wm −2 ) by the year 2100 if nitrogen fertilization follows the present practice.
Type of Medium:
Online Resource
ISSN:
2752-5295
DOI:
10.1088/2752-5295/aca2d1
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2022
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