Inter-model comparison of global hydroxyl radical (OH) distributions and their impact on atmospheric methane over the 2000-2016 period

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dc.contributor.authorZhao Y
dc.contributor.authorSaunois M
dc.contributor.authorBousquet P
dc.contributor.authorLin X
dc.contributor.authorBerchet A
dc.contributor.authorHegglin MI
dc.contributor.authorCanadell JG
dc.contributor.authorJackson RB
dc.contributor.authorHauglustaine DA
dc.contributor.authorSzopa S
dc.contributor.authorStavert AR
dc.contributor.authorAbraham NL
dc.contributor.authorArchibald AT
dc.contributor.authorBekki S
dc.contributor.authorDeushi M
dc.contributor.authorJöckel P
dc.contributor.authorJosse B
dc.contributor.authorKinnison D
dc.contributor.authorKirner O
dc.contributor.authorMarécal V
dc.contributor.authorPlummer DA
dc.contributor.authorRevell LE
dc.contributor.authorRozanov E
dc.contributor.authorStenke A
dc.contributor.authorStrode S
dc.contributor.authorTilmes S
dc.contributor.authorDlugokencky EJ
dc.contributor.authorZheng B
dc.contributor.authorO'Connor, F.M.
dc.date.accessioned2019-12-01T19:52:17Z
dc.date.available2019-12-01T19:52:17Z
dc.date.issued2019en
dc.date.updated2019-11-21T04:00:55Z
dc.description.abstractAbstract. The modeling study presented here aims to estimate how uncertainties in global hydroxyl radical (OH) distributions, variability, and trends may contribute to resolving discrepancies between simulated and observed methane (CH4) changes since 2000. A multi-model ensemble of 14 OH fields was analyzed and aggregated into 64 scenarios to force the offline atmospheric chemistry transport model LMDz (Laboratoire de Meteorologie Dynamique) with a standard CH4 emission scenario over the period 2000–2016. The multi-model simulated global volume-weighted tropospheric mean OH concentration ([OH]) averaged over 2000–2010 ranges between 8.7×105 and 12.8×105 molec cm−3. The inter-model differences in tropospheric OH burden and vertical distributions are mainly determined by the differences in the nitrogen oxide (NO) distributions, while the spatial discrepancies between OH fields are mostly due to differences in natural emissions and volatile organic compound (VOC) chemistry. From 2000 to 2010, most simulated OH fields show an increase of 0.1–0.3×105 molec cm−3 in the tropospheric mean [OH], with year-to-year variations much smaller than during the historical period 1960–2000. Once ingested into the LMDz model, these OH changes translated into a 5 to 15 ppbv reduction in the CH4 mixing ratio in 2010, which represents 7 %–20 % of the model-simulated CH4 increase due to surface emissions. Between 2010 and 2016, the ensemble of simulations showed that OH changes could lead to a CH4 mixing ratio uncertainty of &gt;±30 ppbv. Over the full 2000–2016 time period, using a common state-of-the-art but nonoptimized emission scenario, the impact of [OH] changes tested here can explain up to 54 % of the gap between model simulations and observations. This result emphasizes the importance of better representing OH abundance and variations in CH4 forward simulations and emission optimizations performed by atmospheric inversions. </jats:p>en
dc.identifier.citationZhao Y, Saunois M, Bousquet P, Lin X, Berchet A, Hegglin MI, Canadell JG, Jackson RB, Hauglustaine DA, Szopa S, Stavert AR, Abraham NL, Archibald AT, Bekki S, Deushi M, Jöckel P, Josse B, Kinnison D, Kirner O, Marécal V, O&amp;apos;Connor FM, Plummer DA, Revell LE, Rozanov E, Stenke A, Strode S, Tilmes S, Dlugokencky EJ, Zheng B Inter-model comparison of global hydroxyl radical (OH) distributions and their impact on atmospheric methane over the 2000&amp;#8211;2016 period. Atmospheric Chemistry and Physics. 19(21). 13701-13723.en
dc.identifier.doihttps://doi.org/10.5194/acp-19-13701-2019
dc.identifier.issn1680-7324
dc.identifier.urihttp://hdl.handle.net/10092/17722
dc.languageEnglish
dc.language.isoen
dc.publisherCopernicus GmbHen
dc.subject.anzsrcField of Research::04 - Earth Sciences::0401 - Atmospheric Sciences::040199 - Atmospheric Sciences not elsewhere classifieden
dc.titleInter-model comparison of global hydroxyl radical (OH) distributions and their impact on atmospheric methane over the 2000-2016 perioden
dc.typeJournal Articleen
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