Identification

Title

A synthesis inversion to constrain global emissions of two very short lived chlorocarbons: Dichloromethane, and perchloroethylene

Abstract

Dichloromethane (CH2Cl2) and perchloroethylene (C2Cl4) are chlorinated very short lived substances (Cl-VSLS) with anthropogenic sources. Recent studies highlight the increasing influence of such compounds, particularly CH2Cl2, on the stratospheric chlorine budget and therefore on ozone depletion. Here, a multiyear global-scale synthesis inversion was performed to optimize CH2Cl2(2006-2017) and C2Cl4(2007-2017) emissions. The approach combines long-term surface observations from global monitoring networks, output from a three-dimensional chemical transport model (TOMCAT), and novel bottom-up information on prior industry emissions. Our posterior results show an increase in global CH(2)Cl(2)emissions from 637 +/- 36 Gg yr(-1)in 2006 to 1,171 +/- 45 Gg yr(-1)in 2017, with Asian emissions accounting for 68% and 89% of these totals, respectively. In absolute terms, Asian CH(2)Cl(2)emissions increased annually by 51 Gg yr(-1)over the study period, while European and North American emissions declined, indicating a continental-scale shift in emission distribution since the mid-2000s. For C2Cl4, we estimate a decrease in global emissions from 141 +/- 14 Gg yr(-1)in 2007 to 106 +/- 12 Gg yr(-1)in 2017. The time-varying posterior emissions offer significant improvements over the prior. Utilizing the posterior emissions leads to modeled tropospheric CH(2)Cl(2)and C(2)Cl(4)abundances and trends in good agreement to those observed (including independent observations to the inversion). A shorter C(2)Cl(4)lifetime, from including an uncertain Cl sink, leads to larger global C(2)Cl(4)emissions by a factor of similar to 1.5, which in some places improves model-measurement agreement. The sensitivity of our findings to assumptions in the inversion procedure, including CH(2)Cl(2)oceanic emissions, is discussed.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7qc06s7

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

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Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2020-06-27T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

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name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

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

Metadata on metadata

Metadata point of contact