the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
An improved model for air–sea exchange of elemental mercury in MITgcm-ECCO v4-Hg: the role of surfactants and waves
Abstract. The air–sea exchange of elemental mercury (Hg0) plays an important role in the global Hg cycle. Existing air–sea exchange models for Hg0 have not considered the impact of sea surfactants and wave breaking on the exchange velocity, leading to insufficient constraints on the flux of Hg0. In this study, we have improved the air–sea exchange model of Hg0 in the three-dimensional ocean transport model MITgcm by incorporating sea surfactants and wave breaking processes through parameterization utilizing the total organic carbon concentration and significant wave height data. The inclusion of these factors results in an increase of over twofold in the transfer velocity of Hg0 relative to the baseline model. Air–sea exchange flux is increased in mid- to high-latitude regions with high wind and wave breaking efficiency, while it is reduced by surfactant and concentration change at low latitudes with low wind speeds and nearshore areas with low wave heights. Compared with previous parameterizations, the updated model demonstrates a stronger dependence of Hg0 air–sea exchange velocity on wind speed. Our results also provide a theoretical explanation for the large variances in estimated transfer velocity between different schemes.
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Status: open (until 30 Jul 2024)
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CEC1: 'Comment on gmd-2024-81', Juan Antonio Añel, 13 Jun 2024
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Dear authors,
Unfortunately, after checking your manuscript, it has come to our attention that it does not comply with our "Code and Data Policy".
https://www.geoscientific-model-development.net/policies/code_and_data_policy.html
You have archived the code of the model you use on GitHub. However, GitHub is not a suitable repository for scientific publication. GitHub itself instructs authors to use other alternatives for long-term archival and publishing, such as Zenodo. Therefore, please, publish your code in one of the appropriate repositories, and reply to this comment with the relevant information (link and DOI) as soon as possible, as we can not accept manuscripts in Discussions that do not comply with our policy. Therefore, the current situation with your manuscript is irregular.In this way, if you do not fix this problem, we will have to reject your manuscript for publication in our journal.
Also, you must include in a potentially reviewed version of your manuscript the modified 'Code and Data Availability' section, the DOI of the code (and another DOI for the dataset if necessary).
Juan A. Añel
Geosci. Model Dev. Executive EditorCitation: https://doi.org/10.5194/gmd-2024-81-CEC1 -
AC1: 'Reply on CEC1', Yanxu Zhang, 14 Jun 2024
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Dear Juan A. Añel,
Thank you for bringing this to our attention and for providing clear guidance on the matter. We have published MITgcm model code and datasets of this paper in Zenodo at https://zenodo.org/records/11645612. And We will also include the DOI of the code in the modified 'Code and Data Availability' section of our manuscript.
Sincerely,
Yanxu Zhang
Citation: https://doi.org/10.5194/gmd-2024-81-AC1 -
CEC2: 'Reply on AC1', Juan Antonio Añel, 14 Jun 2024
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Dear authors,
Many thanks for addressing this issue so quickly.
Regards,
Juan A. Añel
Geosci. Model Dev. Executive Editor
Citation: https://doi.org/10.5194/gmd-2024-81-CEC2
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CEC2: 'Reply on AC1', Juan Antonio Añel, 14 Jun 2024
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AC1: 'Reply on CEC1', Yanxu Zhang, 14 Jun 2024
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