the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
A Global land snow scheme (GLASS) v1.0 for the GFDL Earth System Model: Formulation and evaluation at instrumented sites
Abstract. Snowpack modulates water storage over extended land regions, and at the same time plays a central role in the surface albedo feedback, impacting the climate system energy balance. Despite the complexity of snow processes and their importance for both land hydrology and global climate, several state-of-the-art land surface models and Earth System Models still employ relatively simple descriptions of snowpack dynamics. In this study we present a newly-developed snow scheme tailored to the Geophysical Fluid Dynamics Laboratory (GFDL) Land Model version 4.1. This new snowpack model, named GLASS ("Global LAnd-Snow Scheme"), includes a refined and dynamical vertical layering snow structure which allows us to track in each snow layer the temporal evolution of snow grain properties, while at the same time limiting the model computational expense, as necessary for a model suited to global-scale climate simulations. In GLASS, the evolution of snow grain size and shape is explicitly resolved, with implications for predicted bulk snow properties, as they directly impact snow depth, snow thermal conductivity and optical properties. Here we describe the physical processes in GLASS and their implementation, as well as the interactions with other surface processes and the land-atmosphere coupling in the GFDL Earth System Model. The performance of GLASS is tested over 10 experimental sites, where in-situ observations allow for a comprehensive model evaluation. We find that, when compared to previous version of GFDL snow model, GLASS improves predictions of seasonal snow water equivalent and soil temperature under the snowpack.
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Status: open (until 31 May 2024)
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CEC1: 'Comment on egusphere-2024-506', Juan Antonio Añel, 28 Mar 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.htmlFirst, the "Code and Data Availability" section in your manuscript points out two Git repositories. Git repositories are not valid for scientific publication. This is clearly stated in our policy. Moreover, the links that you provide to the repositories do not work. At least the repositories do not load when writing this comment.
You have included a Zenodo repository in the information for your manuscript. However, this is not visible or available for readers and anyone who would like to comment on your manuscript during the Discussions stage, therefore impeding a proper evaluation of it by the community members. To partially solve this issue, I publish here the information for the repository containing code and data here:Code for the Global Land Snow Scheme (GLASS) v1.0.0: https://zenodo.org/records/10681526
However, in any potentially reviewed version of your work, you must include the Zenodo repository information (link and DOI) in the "Code and Data Availability" section and remove the links to the Git repositories.
Secondly, you have developed a snowpack model run as part of the GFDL ESM 4.1. Therefore, it is only possible to replicate your work with the complete GFDL ESM 4.1 code, as your code is run as part of it. This means that you must include a new repository (e.g., again Zenodo - or any other acceptable according to our policy) and its DOI in the "Code and Data Availability" section with your work. 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 it should be available before the Discussions stage. Later, if your manuscript is accepted for publication or goes through a new round of reviews, you must include the information in the text of the manuscript.
If you do not fix this problem and promptly reply to this comment with the requested information, we will have to reject your manuscript for publication in our journal. I should note that, given this lack of compliance with our policy, your manuscript should not have been accepted in Discussions. Therefore, the current situation with your manuscript is irregular.Juan A. Añel
Geosci. Model Dev. Executive EditorCitation: https://doi.org/10.5194/egusphere-2024-506-CEC1 -
AC1: 'Reply on CEC1', Enrico Zorzetto, 01 Apr 2024
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Dear Editor,
Thank you for your comment regarding our manuscript.
About the first point raised in the comment: We would like to note that the Zenodo repository with our model software and data is already reported in the manuscript in the "code and data availability" statement at line 745, which reads:
"Code and data availability. The source code of GLASS v1.0 as well as the input data and model output are shared in a public repository:https://zenodo.org/records/10681526"
The mention of the two git repositories at line 675 of the manuscript is erroneous and should have been removed in the final version of the manuscript. They do not contain any additional information with respect to the Zenodo repository and were used only as a placeholder before submitting our software and data to the Zenodo repository. We will be sure to remove mention of these git repositories in any updated version of the manuscript, and hope readers and reviewers will refer to the existing code and data availability statement at line 745 of the current manuscript, which contains a link to the Zenodo repository with data and software. The same DOI is reported in the online assets.
About the second point raised in the comment, concerning the model code of GLASS v1.0 within ESM4.1: The snow model we developed is indeed a component of ESM4.1. We did not include the entire ESM4.1 source code in our repository as this is a published software appropriately referenced in the manuscript. The Zenodo repository mentioned in the manuscript contains the new code component as well as new input data developed as part of this work.
As requested, we have now submitted a new version of our software on Zenodo which, in addition to the snow model GLASS developed in our work, includes the entire land model (LM4) used in our work. This new repository includes the entire codebase used in our study, as well as the input data used. The DOI of this updated repository, which we will include in any revised version of the manuscript, is reported here:
https://zenodo.org/records/10901373Please let me know whether this answer is satisfactory and whether any additional clarification may be needed.
Enrico Zorzetto,
On behalf of all authors
Citation: https://doi.org/10.5194/egusphere-2024-506-AC1 -
CEC2: 'Reply on AC1', Juan Antonio Añel, 01 Apr 2024
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Dear authors,
Thanks for your reply. Indeed, it is quite unfortunate that you have included erroneously two "Code and Data Availability" sections in your manuscript. To clarify it, the correct place for this section is where in the preprint is currently the information about the Git repositories, not at the bottom of the manuscript.
Regarding the ESM4.1 code, unfortunately, your reply does not comply with our policy. It is my understanding that the land model is run as a module of the full model, and that it is what you have used for your work. Therefore, you have to deposit in the repository the full model, not only the land component. That is, the repository must contain all the software that you have used to perform your work.
Juan A. Añel
Geosci. Model Dev. Executive Editor
Citation: https://doi.org/10.5194/egusphere-2024-506-CEC2 -
AC2: 'Reply on CEC2', Enrico Zorzetto, 01 Apr 2024
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With respect to the content of the repository:
The code we provide in the revised repository (the entire land model of ESM4.1 including the snow model GLASS) is exactly the source code we compile and run to obtain the results in the paper. There is no additional source code required to replicate our results. As mentioned in the paper and in the documentation of the Zenodo repository, what we present in the manuscript is the result of a standalone land model simulation. The atmospheric forcing is observed rather than modeled, and we include the input atmospheric data we used for this purpose as part of the code and data release. We will make sure to further clarify this point in the revised manuscript.
Enrico Zorzetto,
on behalf of all authors
Citation: https://doi.org/10.5194/egusphere-2024-506-AC2 -
CEC3: 'Reply on AC2', Juan Antonio Añel, 02 Apr 2024
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Dear authros,
Thanks for the clarification. Not being the topical editor handling your manuscript, I had not read it thoroughly and was unaware that the atmosphere was observed data. This way, we can consider your manuscript in compliance with our journal code policy.
Regards,
Juan A. Añel
Geosci. Model Dev. Executive Editor
Citation: https://doi.org/10.5194/egusphere-2024-506-CEC3
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CEC3: 'Reply on AC2', Juan Antonio Añel, 02 Apr 2024
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AC2: 'Reply on CEC2', Enrico Zorzetto, 01 Apr 2024
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CEC2: 'Reply on AC1', Juan Antonio Añel, 01 Apr 2024
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AC1: 'Reply on CEC1', Enrico Zorzetto, 01 Apr 2024
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Data sets
A Global Land Snow Scheme (GLASS) v1.0.0 Enrico Zorzetto https://zenodo.org/records/10681526
Model code and software
A Global Land Snow Scheme (GLASS) v1.0.0 Enrico Zorzetto https://zenodo.org/records/10681526
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