DOI: 10.1002/jgrd.50845
论文题名: Comparison of modeled and observed effects of radiation belt electron precipitation on mesospheric hydroxyl and ozone
作者: Verronen P.T. ; Andersson M.E. ; Rodger C.J. ; Clilverd M.A. ; Wang S. ; Turunen E.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 11419
结束页码: 11428
语种: 英语
英文关键词: electron precipitation
; hydroxyl
; mesosphere
; ozone
Scopus关键词: Geomagnetism
; Ozone
; Ozone layer
; Protons
; Radiation belts
; Day-to-day variability
; Electron precipitation
; Energetic electron precipitation
; hydroxyl
; mesosphere
; Microwave limb sounder
; Radiation belt electrons
; Satellite observations
; Electrons
; atmospheric modeling
; Aura (satellite)
; comparative study
; concentration (composition)
; DEMETER
; electron
; hydroxyl radical
; ionization
; mesosphere
; ozone
; precipitation (chemistry)
英文摘要: Observations have shown that mesospheric hydroxyl (OH) is affected by energetic electron precipitation (EEP) at magnetic latitudes connected to the outer radiation belt. It is not clear, however, if the current satellite-based electron flux observations can be used to accurately describe EEP in atmospheric models. We use the Sodankylä Ion and Neutral Chemistry (SIC) model to reproduce the changes in OH and ozone observed by the Microwave Limb Sounder (MLS/Aura) during four strong EEP events. The daily mean electron energy-flux spectrum, needed for ionization rate calculations, is determined by combining the Medium Energy Proton and Electron Detector fluxes and spectral form from the instrument for the detection of particles high-energy electron detector on board the DEMETER satellite. We show that in general SIC is able to reproduce the observed day-to-day variability of OH and ozone. In the lower mesosphere, the model tends to underestimate the OH concentration, possibly because of uncertainties in the electron spectra for energies >300 keV. The model predicts OH increases at 60-80 km, reaching several hundred percent at 70-80 km during peak EEP forcing. Increases in OH are followed by ozone depletion, up to several tens of percent. The magnitude of modeled changes is similar to those observed by MLS and comparable to effects of individual solar proton events. Our results suggest that the combined satellite observations of electrons can be used to model the EEP effects above 70 km during geomagnetic storms, without a need for significant adjustments. However, for EEP energies >300 keV impacting altitudes <70 km, correction factors may be required. Key Points Electron precipitation effect can be comparable to that of solar proton events Model results generally agree with satellite observations above 70 km Correction of electron flux observations might be needed at energies > 300 keV ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63277
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Earth Observation, Finnish Meteorological Institute, P.O. Box 503, FI-00101 Helsinki, Finland; Department of Physics, University of Otago, Dunedin, New Zealand; British Antarctic Survey (NERC), Cambridge, United Kingdom; Jet Propulsion Laboratory, California Institute of Technology, Pasadena CA, United States; Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
Recommended Citation:
Verronen P.T.,Andersson M.E.,Rodger C.J.,et al. Comparison of modeled and observed effects of radiation belt electron precipitation on mesospheric hydroxyl and ozone[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)