globalchange  > 气候减缓与适应
DOI: 10.1029/2018JA025507
Scopus记录号: 2-s2.0-85051085665
论文题名:
Observations and Modeling of Increased Nitric Oxide in the Antarctic Polar Middle Atmosphere Associated With Geomagnetic Storm-Driven Energetic Electron Precipitation
作者: Newnham D.A.; Clilverd M.A.; Rodger C.J.; Hendrickx K.; Megner L.; Kavanagh A.J.; Seppälä A.; Verronen P.T.; Andersson M.E.; Marsh D.R.; Kovács T.; Feng W.; Plane J.M.C.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:7
起始页码: 6009
结束页码: 6025
语种: 英语
英文关键词: D-region chemistry ; energetic particle precipitation ; medium-energy electrons ; millimeter-wave radiometry ; nitric oxide ; polar middle atmosphere
英文摘要: Nitric oxide (NO) produced in the polar middle and upper atmosphere by energetic particle precipitation depletes ozone in the mesosphere and, following vertical transport in the winter polar vortex, in the stratosphere. Medium-energy electron (MEE) ionization by 30–1,000 keV electrons during geomagnetic storms may have a significant role in mesospheric NO production. However, questions remain about the relative importance of direct NO production by MEE at altitudes ~60–90 km versus indirect NO originating from auroral ionization above 90 km. We investigate potential drivers of NO variability in the southern-hemisphere mesosphere and lower thermosphere during 2013–2014. Contrasting geomagnetic activity occurred during the two austral winters, with more numerous moderate storms in the 2013 winter. Ground-based millimeter-wave observations of NO from Halley, Antarctica, are compared with measurements by the Solar Occultation For Ice Experiment (SOFIE) spaceborne spectrometer. NO partial columns over the altitude range 65–140 km from the two observational data sets show large day-to-day variability and significant disagreement, with Halley values on average 49% higher than the corresponding SOFIE data. SOFIE NO number densities, zonally averaged over geomagnetic latitudes −59° to −65°, are up to 3 × 108/cm3 higher in the winter of 2013 compared to 2014. Comparisons with a new version of the Whole Atmosphere Community Climate Model, which includes detailed D-region ion chemistry (WACCM-SIC) and MEE ionization rates, show that the model underestimates NO in the winter lower mesosphere whereas thermospheric abundances are too high. This indicates the need to further improve and verify WACCM-SIC with respect to MEE ionization, thermospheric NO chemistry, and vertical transport. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113669
Appears in Collections:气候减缓与适应

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作者单位: British Antarctic Survey, Cambridge, United Kingdom; Department of Physics, University of Otago, Dunedin, New Zealand; Department of Meteorology (MISU), Stockholm University, Stockholm, Sweden; Formerly at Finnish Meteorological Institute, Helsinki, Finland; Space and Earth Observation Centre, Finnish Meteorological Institute, Helsinki, Finland; Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, United States; School of Chemistry, University of Leeds, Leeds, United Kingdom; National Centre for Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, United Kingdom

Recommended Citation:
Newnham D.A.,Clilverd M.A.,Rodger C.J.,et al. Observations and Modeling of Increased Nitric Oxide in the Antarctic Polar Middle Atmosphere Associated With Geomagnetic Storm-Driven Energetic Electron Precipitation[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(7)
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