A5067389335- Planetary Science and Exploration
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Space Exploration and Technology
- Geophysics and Gravity Measurements
- Space Science and Extraterrestrial Life
- Spaceflight effects on biology
- Stellar, planetary, and galactic studies
- Geomagnetism and Paleomagnetism Studies
- Atmospheric and Environmental Gas Dynamics
- Scientific Research and Discoveries
- Earthquake Detection and Analysis
- Methane Hydrates and Related Phenomena
- Ocean Waves and Remote Sensing
- Meteorological Phenomena and Simulations
- Geology and Paleoclimatology Research
- Atmospheric aerosols and clouds
- Spacecraft and Cryogenic Technologies
- Astrophysics and Star Formation Studies
- Engineering Diagnostics and Reliability
- Marine and environmental studies
- Aeolian processes and effects
- Industrial Engineering and Technologies
Max Planck Institute for Solar System Research
2015-2024
Max Planck Society
2008-2019
Moscow Polytechnic University
2014-2019
University of Göttingen
2014-2017
Japan Aerospace Exploration Agency
2010
Max Planck Innovation
2009
Dalhousie University
2003-2004
York University
1995-2001
University of Toronto
2000
University of Maryland, College Park
1999
A parameterization of gravity wave (GW) drag, suitable for implementation into general circulation models (GCMs) extending the thermosphere is presented. Unlike existing schemes, systematically accounts dissipation in upper atmosphere due to molecular viscosity, thermal conduction, ion friction, and radiative damping form Newtonian cooling. This addition using commonly employed breaking/saturation based on either linear Hodges‐Lindzen instability criteria or its nonlinear extension...
The Atmospheric Chemistry Suite (ACS) package is an element of the Russian contribution to ESA-Roscosmos ExoMars 2016 Trace Gas Orbiter (TGO) mission. ACS consists three separate infrared spectrometers, sharing common mechanical, electrical, and thermal interfaces. This ensemble spectrometers has been designed developed in response mission objectives that specifically address requirement high sensitivity instruments enable unambiguous detection trace gases potential geophysical or biological...
A nonlinear spectral gravity wave (GW) drag parameterization systematically accounting for breaking and dissipation in the thermosphere developed by Yiğit et al. (2008) has been implemented into University College London Coupled Middle Atmosphere‐Thermosphere‐2 (CMAT2) general circulation model (GCM). The dynamical role of GWs propagating upward from lower atmosphere studied a series GCM tests June solstice conditions. results suggest that GW is not only nonnegligible above turbopause, but...
For the first time, estimates of heating and cooling in upper thermosphere due to dissipating breaking gravity waves (GWs) tropospheric origin have been obtained with a comprehensive general circulation model (GCM). A GW parameterization specifically designed for thermospheric heights has implemented CMAT2 GCM covering altitudes from tropopause F 2 region, simulations June solstice performed. They reveal that net thermal effect GWs above turbopause is cooling. The largest (up −170 K d −1...
The climatology of ozone produced by the Canadian Middle Atmosphere Model (CMAM) is presented. This three‐dimensional global model incorporates radiative feedbacks and water vapor calculated on‐line with a photochemical module. module includes comprehensive gas‐phase reaction set limited heterogeneous reactions to account for processes occurring on background sulphate aerosols. While transport global, photochemistry solved from about 400 hPa top at ∼95 km. approach provides complete...
Extensions of Weinstock's theory nonlinear gravity waves and a parameterization the related momentum deposition are developed. Our approach, which combines aspects Hines' Doppler spreading with wave diffusion, treats low‐frequency part spectrum as an additional background flow for higher‐frequency waves. This technique allows one to calculate frequency shifting amplitude damping produced by interaction this wind. For nearly monochromatic formulae drag coincide those Lindzen. It is shown that...
[1] Our recently developed nonlinear spectral gravity wave (GW) parameterization has been implemented into a Martian general circulation model (GCM) that extended to ∼130 km height. The simulations reveal very strong influence of subgrid-scale GWs with non-zero phase velocities in the upper mesosphere (100–130 km). momentum deposition provided by breaking/saturating/dissipating lower atmospheric origin significantly decelerate zonal wind, and even produce jet reversals similar those observed...
Propagation of internal gravity waves (GWs) from the lower atmosphere into upper thermosphere, and their dynamical thermal effects have been studied under low high solar activity approximated by F 10.7 parameter. It has done using a nonlinear spectral parameterization in systematic offline calculations with typical wind temperature distributions HWM MSISE‐90 models, interactive simulations University College London Coupled Middle Atmosphere‐Thermosphere‐2 (CMAT2) general circulation model...
Abstract Wavelike perturbations in the Martian upper thermosphere observed by Neutral Gas Ion Mass Spectrometer (NGIMS) onboard Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft have been analyzed. The amplitudes of small‐scale with apparent wavelengths between ~100 ~500 km Ar density around exobase show a clear dependence on temperature ( T 0 ) thermosphere. average amplitude is ~10% dayside ~20% nightside, which about 2 10 times larger than those Venusian low‐latitude region...
For the first time, gravity wave‐induced heating and cooling effects were fully interactively incorporated into a Martian general circulation model (GCM). Simulations with comprehensive GCM an implemented spectral nonlinear wave (GW) parameterization revealed significant thermal of GWs in mesosphere lower thermosphere (MLT) between 100 150 km. Wave‐induced rates are comparable those due to near‐IR CO 2 IR cooling, correspondingly. Accounting for results colder simulated MLT, most taking...
Simulations with a general circulation model (GCM) have been performed to study the Martian upper atmosphere during two major dust storms. The GCM extending from surface about 160 km included spectral parameterization of subgrid‐scale gravity waves suitable for planetary thermospheres, and prescribed four‐dimensional distributions corresponding storm events near equinox solstice (Martian years 25 28, respectively). results show that wind temperature fields in above ∼100 respond such storms...
We present results of simulations with the Max Planck Institute general circulation model (MPI-MGCM) implementing a hydrological cycle scheme. The reveal seasonal water "pump" mechanism responsible for upward transport vapor. This occurs in high latitudes above 60$^\circ$ southern hemisphere at perihelion, when branch meridional is particularly strong. A combination mean vertical flux variations induced by solar tides facilitates penetration across "bottleneck" approximately 60 km. then...
The dynamical and thermodynamical importance of gravity waves was initially recognized in the atmosphere Earth. Extensive studies over recent decades demonstrated that exist atmospheres other planets, similarly play a significant role vertical coupling atmospheric layers and, thus, must be included numerical general circulation models. Since spatial scales are smaller than typical resolution most models, forcing produced by them parameterized. This paper presents review planetary...
Lower atmospheric global dust storms affect the small- and large-scale weather variability of whole Martian atmosphere. Analysis CO$_2$ density data from Neutral Gas Ion Mass Spectrometer instrument (NGIMS) on board NASA's Mars Atmosphere Volatile EvolutioN (MAVEN) spacecraft show a remarkable increase GW-induced fluctuations in thermosphere during 2018 major storm with distinct latitude local time variability. The mean thermospheric GW activity increases by factor two event. magnitude...
We report on an initial analysis of Herschel/HIFI observations hydrogen chloride (HCl), peroxide (H_2O_2), and molecular oxygen (O_2) in the Martian atmosphere performed 13 16 April 2010 (L_s ~ 77{\deg}). derived a constant volume mixing ratio 1400 +/- 120 ppm for O_2 determined upper limits 200 ppt HCl 2 ppb H_2O_2. Radiative transfer model calculations indicate that vertical profile may not be constant. Photochemical models determine lowest values H_2O_2 to around L_s 75{\deg} but...
We report on the initial analysis of a <i>Herschel<i/>-PACS full range spectrum Neptune, covering 51–220 <i>μ<i/>m with mean resolving power ~3000, and complemented by dedicated observation CH<sub>4<sub/> at 120 <i>μ<i/>m. Numerous spectral features due to HD (R(0) R(1)), H<sub>2<sub/>O, CH<sub>4<sub/>, CO are present, but so far no new species have been found. Our results indicate that (i) Neptune's thermal profile is warmer ~3 K than inferred from <i>Voyager<i/> radio-occultation; (ii) D/H...
Observations show that the lower thermosphere of Mars (∼100–140 km) is up to 40 K colder than current general circulation models (GCMs) can reproduce. Possible candidates for physical processes missing in are larger abundances atomic oxygen facilitating stronger CO2 radiative cooling and thermal effects gravity waves. Using two state-of-the-art Martian GCMs, Laboratoire de Meteorologie Dynamique Max Planck Institute self-consistently cover atmosphere from surface thermosphere, these...
We examine for the first time propagation of gravity waves (GWs) lower atmospheric origin to thermosphere above turbopause during a sudden stratospheric warming (SSW). The study is performed with Coupled Middle Atmosphere‐Thermosphere general circulation model and implemented spectral GW parameterization Yiğit et al. (2008). Simulations reveal strong modulation by SSWs activity, momentum deposition rates, feedbacks at heights up upper (∼270 km). Wave‐induced root mean square wind...
First high-altitude observations of gravity wave (GW)-induced CO$_2$ density perturbations in the Martian thermosphere retrieved from NASA's NGIMS instrument on board MAVEN satellite are presented and interpreted using extended GW parameterization Yi\u{g}it et al. [2008] Mars Climate Database as an input. Observed relative between 180-220 km 20-40 % demonstrate appreciable local time, latitude, altitude variations. Modeling for spatiotemporal conditions suggests that GWs can directly...
We present the results of first investigation influence small‐scale gravity waves (GWs) originating in lower atmosphere on variability high‐latitude thermosphere during a sudden stratospheric warming (SSW). use general circulation model that incorporates spectral GW parameterization Yiğit et al. (2008). During warming, penetration into and resulting momentum deposition rates increase by up to factor 3–6 thermosphere. The associated temporal dynamical effects at ~250 km are enhanced ~10,...
Gravity waves are primarily generated in the lower atmosphere, and can reach thermospheric heights course of their propagation. This paper reviews recent progress understanding role gravity vertical coupling during sudden stratospheric warmings. Modeling wave effects is briefly reviewed, developments field presented. Then, impact these on general circulation upper atmosphere outlined. Finally, between discussed context
Abstract Gravity wave (GW) activity in the lower and middle atmosphere of Mars during global dust storm 2018 has been studied for first time using a high‐resolution (GW‐resolving) general circulation model. Dust simulations were compared with those utilizing climatological distribution absence storms. Both scenarios are based on observations optical depth by Climate Sounder instrument board Reconnaissance Orbiter. The modeling reveals reduction factor 2 or more atmosphere, which...