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Intercomparison of atmospheric carbonyl sulfide (TransCom-COS; Part Two): Evaluation of optimized fluxes using ground-based and aircraft observations
  • +15
  • Jin Ma,
  • Marine Remaud,
  • Philippe Peylin,
  • Prabir K. Patra,
  • Yosuke Niwa,
  • Christian Rödenbeck,
  • Mike Cartwright,
  • Jeremy J Harrison,
  • Martyn P. Chipperfield,
  • Richard J Pope,
  • Chris Wilson,
  • Sauveur Belviso,
  • Stephen A. Montzka,
  • Isaac Josef Vimont,
  • Fred L. Moore,
  • Elliot L. Atlas,
  • Efrat Schwartz,
  • Maarten C. Krol
Jin Ma

Corresponding Author:j.ma@uu.nl

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Marine Remaud
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Philippe Peylin
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Prabir K. Patra
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Yosuke Niwa
National Institute for Environmental Studies
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Christian Rödenbeck
Max Planck Institute for Biogeochemistry
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Mike Cartwright
National Centre for Earth Observation, Space Park Leicester, University of Leicester
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Jeremy J Harrison
National Centre for Earth Observation
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Martyn P. Chipperfield
University of Leeds
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Richard J Pope
University of Leeds
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Chris Wilson
Leeds University
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Sauveur Belviso
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Stephen A. Montzka
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Isaac Josef Vimont
NOAA ESRL Global Monitoring Division
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Fred L. Moore
University of Colorado Boulder
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Elliot L. Atlas
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Efrat Schwartz
Weizmann Institute of Science
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Maarten C. Krol
Utrecht University
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We present a comparison of atmospheric transport models that simulate carbonyl sulfide (COS). This is part II of the ongoing Atmospheric Transport Model (ATM) Inter-comparison Project (TransCom–COS). Differently from part I, we focus on seven model intercomparison by transporting two recent COS inversions of NOAA surface data within TM5-4DVAR and LMDz models. The main goals of TransCom-COS part II are (a) to compare the COS simulations using the two sets of optimized fluxes with simulations that use a control scenario (part I) and (b) to evaluate the simulated tropospheric COS abundance with aircraft-based observations from various sources. The output of the seven transport models are grouped in terms of their vertical mixing strength: strong and weak mixing. The results indicate that all transport models capture the meridional distribution of COS at the surface well. Model simulations generally match the aircraft campaigns HIPPO and ATom. Comparisons to HIPPO and ATom demonstrate a gap between observed and modelled COS over the Pacific Ocean at 0–40N, indicating a potential missing source in the free troposphere. The effects of seasonal continental COS uptake by the biosphere, observed on HIPPO and ATom over oceans, is well reproduced by the simulations. We found that the strength of the vertical mixing within the column as represented in the various atmospheric transport models explains much of the model to model differences. We also found that weak-mixing models transporting the optimized flux derived from the strong-mixing TM5 model show a too strong seasonal cycle at high latitudes.
04 May 2023Submitted to ESS Open Archive
05 May 2023Published in ESS Open Archive