The Impact of Ozone-Depleting Substances on Tropical Upwelling as Revealed by the Absence of Lower-Stratospheric Cooling since the Late 1990s

Polvani, L. M.; Wang, L.; Aquila, V.; Waugh, D. W.

doi:10.1175/jcli-d-16-0532.1

i

The Impact of Ozone-Depleting Substances on Tropical Upwelling as Revealed by the Absence of Lower-Stratospheric Cooling since the Late 1990s

2017
By Polvani, L. M. ; Wang, L. ; Aquila, V. ; ...

Details

Journal Title:

Journal of Climate
Personal Author:

Polvani, L. M. ; Wang, L. ; Aquila, V. ; Waugh, D. W.
NOAA Program & Office:

NWS (National Weather Service)
Description:

The impact of ozone-depleting substances on global lower-stratospheric temperature trends is widely recognized. In the tropics, however, understanding lower-stratospheric temperature trends has proven more challenging. While the tropical lower-stratospheric cooling observed from 1979 to 1997 has been linked to tropical ozone decreases, those ozone trends cannot be of chemical origin, as active chlorine is not abundant in the tropical lower stratosphere. The 1979–97 tropical ozone trends are believed to originate from enhanced upwelling, which, it is often stated, would be driven by increasing concentrations of well-mixed greenhouse gases. This study, using simple arguments based on observational evidence after 1997, combined with model integrations with incrementally added single forcings, argues that trends in ozone-depleting substances, not well-mixed greenhouse gases, have been the primary driver of temperature and ozone trends in the tropical lower stratosphere until 1997, and this has occurred because ozone-depleting substances are key drivers of tropical upwelling and, more generally, of the entire Brewer–Dobson circulation.
Keywords:

Atmospheric Circulation Climatic Changes Ozone Stratosphere Atmospheric Circulation Climatic Changes
Source:

Journal of Climate, 30(7), 2523-2534
DOI:

https://doi.org/10.1175/jcli-d-16-0532.1
Document Type:

Journal Article
Funding:

Grant no. NA15NWS4680014
Rights Information:

Other
Compliance:

CHORUS
Main Document Checksum:

urn:sha256:2f1c3fbdea08f3c76526553c6013a12d4b8f2f86289350914069da2d4f21bef0
Download URL:

https://repository.library.noaa.gov/view/noaa/48370/noaa_48370_DS1.pdf
File Type:

[PDF - 2.76 MB ]

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