Imperial College London
Alternate

Professor Joanna D. Haigh

Faculty of Natural Sciences, Department of Physics

Distinguished Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 7770j.haigh Website

 
 
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Assistant

 

Mr Luke Kratzmann +44 (0)20 7594 7770

 
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Location

 

Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ball:2018:10.5194/acp-2017-862,
author = {Ball, WT and Alsing, J and Mortlock, DJ and Staehelin, J and Haigh, JD and Peter, T and Tummon, F and Stübi, R and Stenke, A and Anderson, J and Bourassa, A and Davis, SM and Degenstein, D and Frith, S and Froidevaux, L and Roth, C and Sofieva, V and Wang, R and Wild, J and Yu, P and Ziemke, JR and Rozanov, EV},
doi = {10.5194/acp-2017-862},
journal = {Atmospheric Chemistry and Physics Discussions},
pages = {1379--1394},
title = {Continuous decline in lower stratospheric ozone offsets ozone layer recovery},
url = {http://dx.doi.org/10.5194/acp-2017-862},
volume = {18},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Ozone forms in the Earth's atmosphere from the photodissociation of molecular oxygen, primarily in the tropical stratosphere. It is then transported to the extratropics by the Brewer–Dobson circulation (BDC), forming a protective "ozone layer" around the globe. Human emissions of halogen-containing ozone-depleting substances (hODSs) led to a decline in stratospheric ozone until they were banned by the Montreal Protocol, and since 1998 ozone in the upper stratosphere is rising again, likely the recovery from halogen-induced losses. Total column measurements of ozone between the Earth's surface and the top of the atmosphere indicate that the ozone layer has stopped declining across the globe, but no clear increase has been observed at latitudes between 60°S and 60°N outside the polar regions (60–90°). Here we report evidence from multiple satellite measurements that ozone in the lower stratosphere between 60°S and 60°N has indeed continued to decline since 1998. We find that, even though upper stratospheric ozone is recovering, the continuing downward trend in the lower stratosphere prevails, resulting in a downward trend in stratospheric column ozone between 60°S and 60°N. We find that total column ozone between 60°S and 60°N appears not to have decreased only because of increases in tropospheric column ozone that compensate for the stratospheric decreases. The reasons for the continued reduction of lower stratospheric ozone are not clear; models do not reproduce these trends, and thus the causes now urgently need to be established.
AU  - Ball,WT
AU  - Alsing,J
AU  - Mortlock,DJ
AU  - Staehelin,J
AU  - Haigh,JD
AU  - Peter,T
AU  - Tummon,F
AU  - Stübi,R
AU  - Stenke,A
AU  - Anderson,J
AU  - Bourassa,A
AU  - Davis,SM
AU  - Degenstein,D
AU  - Frith,S
AU  - Froidevaux,L
AU  - Roth,C
AU  - Sofieva,V
AU  - Wang,R
AU  - Wild,J
AU  - Yu,P
AU  - Ziemke,JR
AU  - Rozanov,EV
DO  - 10.5194/acp-2017-862
EP  - 1394
PY  - 2018///
SN  - 1680-7367
SP  - 1379
TI  - Continuous decline in lower stratospheric ozone offsets ozone layer recovery
T2  - Atmospheric Chemistry and Physics Discussions
UR  - http://dx.doi.org/10.5194/acp-2017-862
UR  - http://hdl.handle.net/10044/1/67794
VL  - 18
ER  -
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