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  • Dataset for Instantaneous radiative effect of surface long wave spectral emissivity in a Snowball Earth simulation

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    Creator:
    Zetterberg, Daniel S., Huang, Xianglei, Hörner, Johannes, Voigt, Aiko, and Chen, Xiuhong
    Description:
    The data and code stored in this repository present the results of the paper "Instantaneous radiative effect of surface long wave spectral emissivity in a Snowball Earth simulation." In this paper, we calculate the instantaneous radiative effects of surface spectral emissivity for a Snowball Earth simulation, and find that including surface spectral emissivity has a moderate effect on the radiation budget. For clear-sky conditions, using ice or snow spectral emissivity can decrease outgoing long wave radiation by 2.9 or 1.0 W/m^2, respectively, globally averaged. This large effect could impact the simulated climate state of a Snowball Earth and potentially strengthen the Jormungand mechanism. Additionally, the large difference between ice and snow highlights the importance of precipitation processes in Snowball modeling. , This repository contains the results of the calculations and the data and code needed to recreate the manuscript figures. It contains atmospheric conditions from the simulations run by JH and AV that were processed by DSZ. It also contains emissivity datasets that were compiled by Huang et al. 2016 ("A global data set of surface spectral emissivity for GCM and NWP use"). MODTRAN calculations of the outgoing longwave radiation were processed by DSZ, XLH, and XC. The results of the study are contained in netcdf files. The README file offers a description, and the Jupyter notebook demonstrates how to access, use, and plot the calculations. , and ***Changes on 10 June, 2025*** New data files contain the outgoing longwave radiation from MODTRAN calculations, but with multiple scattering enabled in MODTRAN. The result is that downward atmospheric radiation can reflect off the surface back to the top of the atmosphere. The result is that the effect of surface emissivity is slightly decreased, though the conclusions and discussion remain unchanged. Additionally, Xiuhong Chen was added as an author, as her expertise in MODTRAN aided in resolving this issue. Data for a plot of a sample emission spectrum was also added, as this was used in the revised manuscript. Key points were updated to match those in the related article.
    Keyword:
    Spectral surface emissivity, Snowball Earth, paleoclimate modeling
    Citation to related publication:
    Zetterberg, D.S., Huang, X.L., Hörner, J., & Voigt, A. Instantaneous radiative effect of surface long wave spectral emissivity in a Snowball Earth simulation. Submitted to Journal of Geophysical Research: Atmospheres, February 2025
    Discipline:
    Science