CEDAR
Coupling, Energetics and Dynamics of Atmospheric Regions Program
x

Nighttime Atomic Hydrogen Abundance Retrieved From SCIAMACHY Hydroxyl Airglow Measurements in the Mesopause Region

Xiaolin
Wu
National Space Science Center, Chinese Academy of Sciences
Abstract text

Atomic hydrogen (H) abundance is crucial for understanding the photochemistry and energy budget in the mesopause region. However, there is still no consensus on the H abundance in this region. This study presents a new hydrogen dataset derived from Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) OH (9-6) band spectra, based on ozone chemical equilibrium at night. Atomic hydrogen number densities peak at 82-87 km and range from 1.5×10^8 to 4×10^8/cm^3, depending on season and latitude. Two other H datasets obtained from SABER are presented for comparison: the datasets from Mlynczak et al. (2018, https://doi.org/10.1029/2018GL077377) and Panka et al. (2021, https://doi.org/10.1029/2020GL091053) are approximately 30% lower and 50% higher than the SCIAMACHY data at the peak altitudes, respectively. Additionally, the H number density retrieved in this study shows better agreement with the only direct rocket in-situ measurements than do those from SABER.

Authors
Xiaolin Wu, Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
Yajun Zhu, Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
Anne K. Smith, NSF National Center for Atmospheric Research, Boulder, Colorado, USA
Martin Kaufamnn, Institute of Energy and Climate Research (IEK-7), Jülich Research Centre, Jülich 52425, Germany
Jiyao Xu, Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
Student in poster competition
Poster category
MLTS - Mesosphere or Lower Thermosphere General Studies
↑