Work Description

Title: Dataset for Instantaneous radiative effect of surface long wave spectral emissivity in a Snowball Earth simulation Open Access Deposited

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Methodology
  • JH and AV ran the ICON climate model to simulate a Snowball Earth state. The resulting simulation data represents climate conditions typical of the formation of a Snowball state. These conditions were used to calculate the effect of surface emissivity on the outgoing long wave radiation (OLR). DSZ, XLH, and XC took the Snowball climate conditions and input them into the MODTRAN radiative transfer code, and altered the surface conditions to be that of a. blackbody, snow, ice, or ocean. Spectral OLR was outputted for each grid cell on the globe (5x4 degree resolution). The OLR was integrated over the RRTMG long wave bands (often used in climate models) and over the broadband long wave spectrum. The difference between the OLR for the surface emissivity case of ocean, ice, or snow and the blackbody case was deemed as the instantaneous radiative effect of spectral surface emissivity. DSZ used Python code to analyze the output from MODTRAN and create the figures. Additionally, a sensitivity study was carried out. OLR was calculated as a function of surface emissivity, atmospheric humidity, and atmospheric profile. Here, the surface emissivities were graybodies and the atmospheric profiles were the averages for tropical, mid-latitude, and polar regions. The effect of emissivity on OLR as a function of total column water vapor was found.
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.

  • ***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.
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Depositor
Contact information
Discipline
Funding agency
  • Other Funding Agency
Other Funding agency
  • University of Michigan
Keyword
Citations to related material
  • 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
Resource type
Curation notes
  • 2025-06-10: Changes to methods, description, files, and new author have been added due to changes during the revision process.
Last modified
  • 06/12/2025
Published
  • 02/18/2025
Language
DOI
  • https://doi.org/10.7302/949x-tw78
License
To Cite this Work:
Zetterberg, D. S., Huang, X., Hörner, J., Voigt, A., Chen, X. (2025). Dataset for Instantaneous radiative effect of surface long wave spectral emissivity in a Snowball Earth simulation [Data set], University of Michigan - Deep Blue Data. https://doi.org/10.7302/949x-tw78

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Files (Count: 9; Size: 2.33 MB)

Thumbnailthumbnail-column Title Original Upload Last Modified File Size Access Actions
emiss_spectral.txt 2025-06-11 2025-06-11 6.01 KB Open Access
README.txt 2025-06-11 2025-06-11 8.54 KB Open Access
broadband_results.nc 2025-06-12 2025-06-12 112 KB Open Access
figure_creator.ipynb 2025-06-12 2025-06-12 894 KB Open Access
monthly_results.nc 2025-06-12 2025-06-12 32.4 KB Open Access
RRTMG_band_results.nc 2025-06-12 2025-06-12 1.2 MB Open Access
sample_emission_spectrum.nc 2025-06-12 2025-06-12 24.6 KB Open Access
sensitivity_results.nc 2025-06-12 2025-06-12 25 KB Open Access
snowball_conditions_plotting_HV2024.nc 2025-06-12 2025-06-12 54.6 KB Open Access

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