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Title: Quantifying isentropic stratosphere-troposphere exchange of ozone

Abstract

There is increased evidence that stratosphere-troposphere exchange (STE) of ozone has a significant impact on tropospheric chemistry and radiation. Traditional diagnostics of STE consider the ozone budget in the lowermost stratosphere (LMS) as a whole. However, this can only render the hemispherically integrated ozone flux and therefore does not distinguish the exchange of ozone into low latitudes from that into high latitudes. The exchange of ozone at different latitudes may have different tropospheric impacts. This present study extends the traditional approach from the entire LMS to individual isentropic layers in the LMS and therefore gives the meridional distribution of STE by the latitudes where each isentropic surface intersects the tropopause. The specified dynamics version of the Whole Atmosphere Community Climate Model is used to estimate the STE ozone flux on each isentropic surface. It is found that net troposphere-to-stratosphere ozone transport occurs in low latitudes along the 350–380 K isentropic surfaces and that net stratosphere-to-troposphere ozone transport takes place in the extratropics along the 280–350 K isentropes. Particularly, the seasonal cycle of extratropical STE ozone flux in the Northern Hemisphere displays a maximum in late spring and early summer, following the seasonal migration of the upper tropospheric jet and associatedmore » isentropic mixing. Moreover, differential diabatic heating and isentropic mixing tend to induce STE ozone fluxes in opposite directions, but the net effect results in a spatiotemporal pattern similar to the STE ozone flux associated with isentropic mixing.« less

Authors:
 [1];  [1];  [2];  [1]
  1. Cornell Univ., Ithaca, NY (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Cornell Univ., Ithaca, NY (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
1367979
Report Number(s):
LLNL-JRNL-674860
Journal ID: ISSN 2169-897X
Grant/Contract Number:  
AC52-07NA27344; AGS-1042787
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 121; Journal Issue: 7; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; stratosphere-troposphere exchange; isentropic diagnostics; diabatic heating; mixing

Citation Formats

Yang, Huang, Chen, Gang, Tang, Qi, and Hess, Peter. Quantifying isentropic stratosphere-troposphere exchange of ozone. United States: N. p., 2016. Web. doi:10.1002/2015JD024180.
Yang, Huang, Chen, Gang, Tang, Qi, & Hess, Peter. Quantifying isentropic stratosphere-troposphere exchange of ozone. United States. doi:10.1002/2015JD024180.
Yang, Huang, Chen, Gang, Tang, Qi, and Hess, Peter. Fri . "Quantifying isentropic stratosphere-troposphere exchange of ozone". United States. doi:10.1002/2015JD024180. https://www.osti.gov/servlets/purl/1367979.
@article{osti_1367979,
title = {Quantifying isentropic stratosphere-troposphere exchange of ozone},
author = {Yang, Huang and Chen, Gang and Tang, Qi and Hess, Peter},
abstractNote = {There is increased evidence that stratosphere-troposphere exchange (STE) of ozone has a significant impact on tropospheric chemistry and radiation. Traditional diagnostics of STE consider the ozone budget in the lowermost stratosphere (LMS) as a whole. However, this can only render the hemispherically integrated ozone flux and therefore does not distinguish the exchange of ozone into low latitudes from that into high latitudes. The exchange of ozone at different latitudes may have different tropospheric impacts. This present study extends the traditional approach from the entire LMS to individual isentropic layers in the LMS and therefore gives the meridional distribution of STE by the latitudes where each isentropic surface intersects the tropopause. The specified dynamics version of the Whole Atmosphere Community Climate Model is used to estimate the STE ozone flux on each isentropic surface. It is found that net troposphere-to-stratosphere ozone transport occurs in low latitudes along the 350–380 K isentropic surfaces and that net stratosphere-to-troposphere ozone transport takes place in the extratropics along the 280–350 K isentropes. Particularly, the seasonal cycle of extratropical STE ozone flux in the Northern Hemisphere displays a maximum in late spring and early summer, following the seasonal migration of the upper tropospheric jet and associated isentropic mixing. Moreover, differential diabatic heating and isentropic mixing tend to induce STE ozone fluxes in opposite directions, but the net effect results in a spatiotemporal pattern similar to the STE ozone flux associated with isentropic mixing.},
doi = {10.1002/2015JD024180},
journal = {Journal of Geophysical Research: Atmospheres},
number = 7,
volume = 121,
place = {United States},
year = {2016},
month = {3}
}

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