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  NOAA/POES EEP fluxes as input for climate modelling

Nesse, H., Salice, J., Sinnhuber, M., Zúñiga López, H. D., Smith-Johnsen, C. (2023): NOAA/POES EEP fluxes as input for climate modelling, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3073

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020481 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020481_1
Genre: Conference Paper

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Nesse, Hilde1, Author
Salice, Josephine1, Author
Sinnhuber, Miriam1, Author
Zúñiga López, Héctor Daniel1, Author
Smith-Johnsen, Christine1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: In recent years, medium energy electrons (MEE) (>30keV) precipitating from the radiation belt has been a topic of increased attention. Studies have revealed large uncertainties in respect to quantify the MEE ionization rates throughout the mesosphere. We report on results from the High Energy Particle Precipitation in the Atmosphere (HEPPA) III intercomparison experiment which is a collective effort to address this point. HEPPA III intercompares eight different estimates MEE which are all based on the Medium Energy Proton and Electron Detector (MEPED) on board the NOAA/POES and EUMETSAT/MetOp spacecraft series. However, different data handling, ionization rate calculations, and background atmospheres result in a wide range of mesospheric electron ionization rates. Although the eight data sets agree well in terms of the temporal variability, they differ by about an order of magnitude in ionization rate strength both during geomagnetic quiet and disturbed periods. The mesospheric NO densities simulated with the Whole Atmospheric Community Climate Model driven by highest and lowest ionization rates differ by more than a factor of eight. Moreover, to understand the importance of accurate of MEE precipitation, we raise the question: How strong MEE fluxes are needed to modulate the atmospheric dynamics? A model study using WACCM demonstrate that even the weakest of the eight MEE ionization rates can directly modulate the mesospheric temperature, zonal wind and the residual circulation affecting NOx transport. We discuss to which degree the impact of the MEE precipitation depends on the dynamical preconditions in the atmosphere itself.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-3073
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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