Identification

Title

The role of natural halogens in global tropospheric ozone chemistry and budget under different 21st century climate scenarios

Abstract

Tropospheric ozone (urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0001) is an important greenhouse gas and a surface pollutant. The future evolution of urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0002 abundances and chemical processing are uncertain due to a changing climate, socioeconomic developments, and missing chemistry in global models. Here, we use an Earth System Model with natural halogen chemistry to investigate the changes in the urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0003 budget over the 21st century following Representative Concentration Pathway (RCP)6.0 and RCP8.5 climate scenarios. Our results indicate that the global tropospheric urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0004 net chemical change (NCC, chemical gross production minus destruction) will decrease urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0005, notwithstanding increasing or decreasing trends in ozone production and loss. However, a wide range of surface NCC variations (from −60urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0006 to 150urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0007) are projected over polluted regions with stringent abatements in urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0008 precursor emissions. Water vapor and iodine are found to be key drivers of future tropospheric urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0009 destruction, while the largest changes in urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0010 production are determined by the future evolution of peroxy radicals. We show that natural halogens, currently not considered in climate models, significantly impact on the present-day and future global urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0011 burden reducing urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-001230–35 Tg (11–15urn:x-wiley:2169897X:media:jgrd57367:jgrd57367-math-0013) of tropospheric ozone throughout the 21st century regardless of the RCP scenario considered. This highlights the importance of including natural halogen chemistry in climate model projections of future tropospheric ozone.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7348pvz

codeSpace

Dataset language

eng

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geoscientificInformation

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title

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reference date

date type

publication

effective date

2016-01-01T00:00:00Z

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date type

publication

effective date

2021-10-27T00:00:00Z

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None

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contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

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