Nitrous Oxide (N2O): The Dominant Ozone-Depleting Substance Emitted in the 21st Century

  title={Nitrous Oxide (N2O): The Dominant Ozone-Depleting Substance Emitted in the 21st Century},
  author={Akkihebbal R. Ravishankara and John Daniel and Robert W. Portmann},
  pages={123 - 125}
Unwelcome Dominance Stratospheric ozone is depleted by many different chemicals; most prominently, chlorofluorocarbons (CFCs) responsible for causing the Antarctic ozone hole. Nitrous oxide is also an ozone-depleting substance that has natural sources in addition to anthropogenic ones. Moreover, unlike CFCs, its use and emission are not regulated by the Montreal Protocol, which has helped to reverse the rate of growth of the ozone hole. Surprisingly, Ravishankara et al. (p. 123, published… 

The changing ozone depletion potential of N2O in a future climate

Nitrous oxide (N2O), which decomposes in the stratosphere to form nitrogen oxides (NOx), is currently the dominant anthropogenic ozone‐depleting substance emitted. Ozone depletion potentials (ODPs)

Stratospheric ozone depletion due to nitrous oxide: influences of other gases

Reductions in anthropogenic N2O emissions provide a larger opportunity for reduction in future O3 depletion than any of the remaining uncontrolled halocarbon emissions.

Nitrous Oxide: No Laughing Matter

The report by Ravishankara et al. on page 123 of this issue (1) not only adds to the scientific understanding of this important gas, but is a strong reminder that nitrous oxide deserves much more attention and consideration for policy action to control future human-related emissions.

The effectiveness of N2O in depleting stratospheric ozone

Recently, it was shown that of the ozone‐depleting substances currently emitted, N2O emissions (the primary source of stratospheric NOx) dominate, and are likely to do so throughout the 21st century.

Impact of future nitrous oxide and carbon dioxide emissions on the stratospheric ozone layer

The atmospheric levels of human-produced chlorocarbons and bromocarbons are projected to make only small contributions to ozone depletion by 2100. Increases in carbon dioxide (CO2) and nitrous oxide

The Role of Nitrous Oxide on Climate Change

Nitrous oxide is the third most important anthropogenic greenhouse gas in the atmosphere, contributing about 6% to the radiative forcing by long-lived greenhouse gases. In addition to its role as

Reducing nitrous oxide emissions to mitigate climate change and protect the ozone layer.

The results show that from 1990 to 2012, industrial N2O emissions in China grew by some 37-fold, with total accumulated emissions of 1.26 Tg, and from 2012 to 2020, the projected emissions are expected to continue growing rapidly from 174 to 561 Gg under current policies and assuming no additional mitigation measures.

The impact of the rise in atmospheric nitrous oxide on stratospheric ozone

It is known that atmospheric N2O, which is present in the atmosphere in 2020 at a mixing ratio of 332.8 ppb, is not only important for stratospheric ozone but also constitutes the third most important long-lived greenhouse gas (after CO2 and CH4).

Climate change reduces warming potential of nitrous oxide by an enhanced Brewer‐Dobson circulation

The Brewer‐Dobson circulation (BDC), which is an important driver of the stratosphere‐troposphere exchange, is expected to accelerate with climate change. One particular consequence of this

Massive nitrous oxide emissions from the tropical South Pacific Ocean

Nitrous oxide is a potent greenhouse gas and a key compound in stratospheric ozone depletion. In the ocean, nitrous oxide is produced at intermediate depths through nitrification and denitrification,



Ozone calculations with large nitrous oxide and chlorine changes

The purpose of this study is broadly to reinvestigate NOx-Clx interactions relative to ozone control in the stratosphere, using the long-established Lawrence Livermore National Laboratory

N 2 O release from agro-biofuel production negates global warming reduction by replacing fossil fuels

The relationship, on a global basis, between the amount of N fixed by chemical, biological or atmospheric processes entering the terrestrial biosphere, and the total emission of nitrous oxide (N2O),

Indirect radiative forcing of the ozone layer during the 21st century

The response of a coupled two‐dimensional radiative‐chemical‐dynamical model to possible 21st century changes of the greenhouse gasses (GHGs) carbon dioxide, nitrous oxide and methane are explored

On the evaluation of ozone depletion potentials

Observations of methane, CFC-11, and ozone losses are used along with insights from models and observations regarding interrelationships between tracers to develop a semi-empirical framework for

Stratospheric ozone depletion at northern mid latitudes in the 21st century: The importance of future concentrations of greenhouse gases nitrous oxide and methane

There is evidence that the halogen loading of the atmosphere has peaked and stratospheric ozone levels are expected to recover to pre‐1980 levels this century. However, N2O concentrations in the

Chlorocarbon emission scenarios: Potential impact on stratospheric ozone

Prior analyses of chlorocarbons and their effects on stratospheric ozone have primarily concentrated on examining potential perturbations from two chlorofluorocarbons, CFCl3 (CFC-11) and CF2Cl2

The influence of nitrogen oxides on the atmospheric ozone content

The probable importance of NO and NO2 in controlling the ozone concentrations and production rates in the stratosphere is pointed out. Observations on and determinations of nitric acid concentrations

Offsetting the radiative benefit of ocean iron fertilization by enhancing N2O emissions

Ocean iron fertilization is being considered as a strategy for mitigating the buildup of anthropogenic CO2 in the atmosphere. Assessment of this strategy requires consideration of its unintended

The Montreal Protocol on Substances that Deplete the Ozone Layer

1. Owing to the ongoing coronavirus disease (COVID-19) pandemic, it was not possible to convene the forty-second meeting of the Open-ended Working Group of the Parties to the Montreal Protocol on