This study examines the impact of greenhouse gases (GHG) on infrared back radiation (IRBR) in extreme desert and midlatitude winter conditions. Employing MODTRAN simulations, pyrgeometer measurements and energy balance fit models, we assess the impacts of CO2, Argon (Ar), N2O and R-134a. Results indicate that increasing CO2 concentrations yield a very limited additional IRBR effect, whereas R-134a exhibits significant radiative forcing even at trace levels. These findings highlight the critical role of synthetic GHGs in climate dynamics and provide insights into radiative forcing in arid regions, enhancing climate model accuracy for desert environments and contribute to the general assessment of the impact of increasing CO2 concentrations in our atmosphere. Likewise, these measurements have shown again that the contribution of CO2 to the total back radiation is largely saturated within the historical concentration boundaries far beyond current levels and back radiation by water vapor is the dominant effect.
References
[1]
Li, X., Xu, H. and Yang, K. (2013) The Impact of Infrared Back-Radiation on the Surface Energy Balance in Deserts. Geophysical Research Letters, 40, 2405-2410.
[2]
Boucher, O. and Reddy, M.S. (2008) Global Climate Change: Implications for the Energy Balance. Nature Geoscience, 1, 713-718.
[3]
Fisher, R.A. and Knutti, R. (2015) The Influence of Surface Properties and Radiative Fluxes on Climate Sensitivity. Nature Climate Change, 5, 3-6.
[4]
Ramanathan, V. and Feng, Y. (2009) Air Pollution, Climate Change, and Global Warming: Global and Regional Perspectives. Atmospheric Environment, 43, 37-41.
[5]
Charney, J.G. and Shukla, J. (1981) The Role of Desertification in the Global Climate System. Science, 213, 979-988. https://doi.org/10.1126/science.213.4510.979
[6]
Stephens, G.L. (2005) Cloud Feedbacks in the Climate System: A Critical Review. JournalofClimate, 18, 237-273. https://doi.org/10.1175/jcli-3243.1
[7]
Wielicki, B.A., Barkstrom, B.R., Harrison, E.F., Lee, R.B., Louis Smith, G. and Cooper, J.E. (1996) Clouds and the Earth’s Radiant Energy System (CERES): An Earth Observing System Experiment. BulletinoftheAmericanMeteorologicalSociety, 77, 853-868. https://doi.org/10.1175/1520-0477(1996)077<0853:catere>2.0.co;2
[8]
Loeb, N.G., et al. (2009) Toward a More Accurate Description of Earth’s Energy Budget: The CERES Mission. Bulletin of the American Meteorological Society, 90, 611-624.
[9]
Loeb, N.G., Doelling, D.R., Wang, H., Su, W., Nguyen, C., Corbett, J.G., et al. (2018) Clouds and the Earth’s Radiant Energy System (CERES) Energy Balanced and Filled (EBAF) Top-of-Atmosphere (TOA) Edition-4.0 Data Product. JournalofClimate, 31, 895-918. https://doi.org/10.1175/jcli-d-17-0208.1
[10]
Salisbury, J.W. and D’Aria, D.M. (1992) Emissivity of Terrestrial Materials in the 8-14 μm Atmospheric Window. RemoteSensingofEnvironment, 42, 83-106. https://doi.org/10.1016/0034-4257(92)90092-x
[11]
Hanel, R.A. and Conrath, B.J. (1970) Thermal Emission Spectra of the Earth and Atmosphere from the Nimbus 4 Michelson Interferometer Experiment. Nature, 228, 143-145. https://doi.org/10.1038/228143a0
[12]
Zhou, L. (2016) Desert Amplification in a Warming Climate. ScientificReports, 6, Article No. 31065. https://doi.org/10.1038/srep31065
[13]
MODTRAN Infrared Light in the Atmosphere. https://climatemodels.uchicago.edu/modtran/modtran.doc.html
[14]
Zhou, C. and Wang, K. (2016) Land Surface Temperature over Global Deserts: Means, Variability, and Trends. JournalofGeophysicalResearch: Atmospheres, 121, 14,344-14,357. https://doi.org/10.1002/2016jd025410
[15]
Ogawa, K. and Schmugge, T. (2004) Mapping Surface Broadband Emissivity of the Sahara Desert Using ASTER and MODIS Data. EarthInteractions, 8, 1-14. https://doi.org/10.1175/1087-3562(2004)008<0001:msbeot>2.0.co;2
[16]
Halling, M. (2024) Greenhouse Energy Balance: A Numerical Approach to Analyze the Influence of Location, Season, and Structural Design of Greenhouses. https://liu.diva-portal.org/smash/get/diva2:1885951/FULLTEXT01.pdf
[17]
Stoffel, T., et al. (2006) Pyrgeometer Calibrations for the Atmospheric Radiation Measurement Program: Updated Approach. ExtendedAbstracts, 16thARMScienceTeamMeeting, Albuquerque, 27-31March 2006, 1-18.
[18]
Philipona, R., Dutton, E.G., Stoffel, T., Michalsky, J., Reda, I., Stifter, A., et al. (2001) Atmospheric Longwave Irradiance Uncertainty: Pyrgeometers Compared to an Absolute Sky‐Scanning Radiometer, Atmospheric Emitted Radiance Interferometer, and Radiative Transfer Model Calculations. JournalofGeophysicalResearch: Atmospheres, 106, 28129-28141. https://doi.org/10.1029/2000jd000196
[19]
Rogers, R.R. and Yau, M.K. (1989) A Short Course in Cloud Physics. 3rd Edition, Pergamon Press, 16.
[20]
Monatsübersicht Wetterstation BOKU-Met Februar 2025. https://meteo.boku.ac.at/wetter/mon-archiv/2025/202502/202502.html
[21]
IPCC (2021) Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press. https://doi.org/10.1017/9781009157896.001
[22]
Soden, B.J. and Held, I.M. (2006) An Assessment of Climate Feedbacks in Coupled Ocean-Atmosphere Models. JournalofClimate, 19, 3354-3360. https://doi.org/10.1175/jcli3799.1
[23]
Pierrehumbert, R.T. (2010) Principles of Planetary Climate. Cambridge University Press. https://doi.org/10.1017/cbo9780511780783
[24]
Hartmann, D.L. (1994) Global Physical Climatology. Academic Press.
[25]
Wallace, J.M. and Hobbs, P.V. (2006) Atmospheric Science: An Introductory Sur-vey. Academic Press.
[26]
Forster, P., et al. (2007) Changes in Atmospheric Constituents and in Radiative Forcing. In: ClimateChange 2007: ThePhysicalScienceBasis. ContributionofWorkingGroupItotheFourthAssessmentReportoftheIntergovernmentalPanelonClimateChange, Cambridge University Press, 129-234.
[27]
Liou, K.N. (2002) An Introduction to Atmospheric Radiation. Vol. 84, Academic Press.
[28]
Myhre, G., et al. (2013) Anthropogenic and Natural Radiative Forcing. In: ClimateChange 2013: ThePhysicalScienceBasis. ContributionofWorkingGroupItotheFifthAssessmentReportoftheIntergovernmentalPanelonClimateChange, Cambridge University Press, 659-740.
[29]
Petty, G.W. (2006) A First Course in Atmospheric Radiation. Sundog Publishing.
[30]
Hammel, E., Steiner, M., Marvan, C., Marvan, M., Retzlaff, K., Bergholz, W., et al. (2024) CO2 Back-Radiation Sensitivity Studies under Laboratory and Field Conditions. AtmosphericandClimateSciences, 14, 407-428. https://doi.org/10.4236/acs.2024.144025
