Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.621 IF 1.621
  • IF 5-year value: 1.614 IF 5-year 1.614
  • CiteScore value: 1.61 CiteScore 1.61
  • SNIP value: 0.900 SNIP 0.900
  • SJR value: 0.910 SJR 0.910
  • IPP value: 1.58 IPP 1.58
  • h5-index value: 24 h5-index 24
  • Scimago H index value: 80 Scimago H index 80
Discussion papers | Copyright
https://doi.org/10.5194/angeo-2018-112
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 19 Oct 2018

Regular paper | 19 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

On the relative roles of dynamics and chemistry governing the abundance and diurnal variation of low latitude thermospheric nitric oxide

David E. Siskind1, McArthur Jones Jr.1, Douglas P. Drob1, John P. McCormack1, Mark E. Hervig2, Daniel R. Marsh3, Martin G. Mlynczak5, Scott M. Bailey4, Astrid Maute3, and Nicholas J. Mitchell6 David E. Siskind et al.
  • 1Space Science Division, Naval Research Laboratory,Washington, DC
  • 2GATS Inc., Driggs ID
  • 3NCAR, Boulder CO
  • 4Virginia Polytechnic, Blacksburg VA
  • 5NASA Langely Research Center, Hampton VA
  • 6Centre for Space, Atmospheric and Oceanic Science, University of Bath, UK

Abstract. We use data from two NASA satellites, the Thermosphere Ionosphere Energetics and Dynamics (TIMED) and the Aeronomy of Ice in the Mesosphere (AIM) satellites in conjunction with model simulations from the Thermosphere-Ionosphere-Mesosphere-Electrodynamics General Circulation Model (TIME-GCM) to elucidate the key dynamical and chemical factors governing the abundance and diurnal variation of nitric oxide (NO) at near solar minimum conditions and low latitudes. This analysis was enabled by the recent orbital precession of the AIM satellite which caused the solar occultation pattern measured by the Solar Occultation for Ice Experiment (SOFIE) to migrate down to low and mid latitudes for specific periods of time. We use a month of NO data collected in January 2017 to compare with two versions of the TIME-GCM, one driven solely by climatological tides and analysis-derived planetary waves at the lower boundary and free running at all other altitudes, while the other is constrained by a high-altitude analysis from the Navy Global Environmental Model (NAVGEM) up to the mesopause. We also compare SOFIE data with a NO climatology from the Nitric Oxide Empirical Model (NOEM). Both SOFIE and NOEM yield peak NO abundances of around 4×107cm−3; however, the SOFIE profile peaks about 6–8km lower than NOEM. We show that this difference is likely a local time effect; SOFIE being a dawn measurement and NOEM representing late morning/near noon. The constrained version of TIME-GCM exhibits a low altitude dawn peak while the model that is forced solely at the lower boundary and free running above does not. We attribute this difference due to a phase change in the semi-diurnal tide in the NAVGEM-constrained model causing descent of high NO mixing ratio air near dawn. This phase difference between the two models arises due to differences in the mesospheric zonal mean zonal winds. Regarding the absolute NO abundance, all versions of the TIME-GCM overestimate this. Tuning the model to yield calculated atomic oxygen in agreement with TIMED data helps, but is insufficient. Further, the TIME-GCM underestimates the electron density [e-] as compared with the International Reference Ionosphere empirical model. This suggests a potential conflict with the requirements of NO modeling and [e-] modeling since one solution typically used to increase model [e-] is to increase the solar soft X ray flux which would, in this case, worsen the NO model/data discrepancy.

David E. Siskind et al.
Interactive discussion
Status: open (until 30 Nov 2018)
Status: open (until 30 Nov 2018)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
David E. Siskind et al.
David E. Siskind et al.
Viewed
Total article views: 230 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
202 26 2 230 0 0
  • HTML: 202
  • PDF: 26
  • XML: 2
  • Total: 230
  • BibTeX: 0
  • EndNote: 0
Views and downloads (calculated since 19 Oct 2018)
Cumulative views and downloads (calculated since 19 Oct 2018)
Viewed (geographical distribution)
Total article views: 230 (including HTML, PDF, and XML) Thereof 229 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited
Saved
No saved metrics found.
Discussed
No discussed metrics found.
Latest update: 13 Nov 2018
Publications Copernicus
Download
Short summary
We use data from two NASA satellites and a general circulation model of the upper atmosphere to elucidate the key factors governing the abundance and diurnal variation of nitric oxide (NO) at near solar minimum conditions and low latitudes. This has been difficult to do previously because NO data are typically taken from satellites in sun-synchronous orbits, which means they only acquire data in fixed local times. We overcome this limitation through model simulations of the NO diurnal cycle.
We use data from two NASA satellites and a general circulation model of the upper atmosphere to...
Citation
Share