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    Evaluation of the N2O Rate of Change to Understand the Stratospheric Brewer-Dobson Circulation in a Chemistry-Climate Model

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    Authors
    Minganti, D.
    Chabrillat, S.
    Errera, Q.
    Prignon, M.
    Kinnison, D.E.
    Garcia, R.R.
    Abalos, M.
    Alsing, J.
    Schneider, M.
    Smale, D.
    Jones, N.
    Mahieu, E.
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    Discipline
    Physical sciences
    Subject
    stratospheric circulation
    Brewer-Dobson circulation
    tracer transport
    trends
    nitrous oxide
    Audience
    Scientific
    Date
    2022
    Metadata
    Show full item record
    Description
    The Brewer-Dobson Circulation (BDC) determines the distribution of long-lived tracers in the stratosphere; therefore, their changes can be used to diagnose changes in the BDC. We evaluate decadal (2005–2018) trends of nitrous oxide (N2O) in two versions of the Whole Atmosphere Chemistry-Climate Model (WACCM) by comparing them with measurements from four Fourier transform infrared (FTIR) ground-based instruments, the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS), and with a chemistry-transport model (CTM) driven by four different reanalyses. The limited sensitivity of the FTIR instruments can hide negative N2O trends in the mid-stratosphere because of the large increase in the lowermost stratosphere. When applying ACE-FTS measurement sampling on model datasets, the reanalyses from the European Center for Medium Range Weather Forecast (ECMWF) compare best with ACE-FTS, but the N2O trends are consistently exaggerated. The N2O trends obtained with WACCM disagree with those obtained from ACE-FTS, but the new WACCM version performs better than the previous above the Southern Hemisphere in the stratosphere. Model sensitivity tests show that the decadal N2O trends reflect changes in the stratospheric transport. We further investigate the N2O Transformed Eulerian Mean (TEM) budget in WACCM and in the CTM simulation driven by the latest ECMWF reanalysis. The TEM analysis shows that enhanced advection affects the stratospheric N2O trends in the Tropics. While no ideal observational dataset currently exists, this model study of N2O trends still provides new insights about the BDC and its changes because of the contribution from relevant sensitivity tests and the TEM analysis.
    Citation
    Minganti, D.; Chabrillat, S.; Errera, Q.; Prignon, M.; Kinnison, D.E.; Garcia, R.R.; Abalos, M.; Alsing, J.; Schneider, M.; Smale, D.; Jones, N.; Mahieu, E. (2022). Evaluation of the N2O Rate of Change to Understand the Stratospheric Brewer-Dobson Circulation in a Chemistry-Climate Model. , Journal of Geophysical Research: Atmospheres, Vol. 127, Issue 22, e2021JD036390, DOI: 10.1029/2021JD036390.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/10687
    doi: http://dx.doi.org/10.1029/2021JD036390
    scopus:
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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