Results 61 to 70 of about 713 (180)

The preconditioning of major sudden stratospheric warmings [PDF]

Journal of Geophysical Research: Atmospheres, 2012
The preconditioning of major sudden stratospheric warmings (SSWs) is investigated with two long time series using reanalysis (ERA‐40) and model (MAECHAM5/MPI‐OM) data. Applying planetary wave analysis, we distinguish between wavenumber‐1 and wavenumber‐2 major SSWs based on the wave activity of zonal wavenumbers 1 and 2 during the prewarming phase. For
Bancalá, S., Krüger, K., Giorgetta, M. ; https://orcid.org/0000-0002-4278-1963   +2 more
openaire   +2 more sources

Antarctic Ozone Enhancement During the 2019 Sudden Stratospheric Warming Event

Geophysical Research Letters, 2020
We analyze the 2019 sudden stratospheric warming event that occurred in the Southern Hemisphere through its impact on the Antarctic ozone. Using temperature, ozone, and nitric acid data from the Infrared Atmospheric Sounding Interferometer (IASI), our ...
Sarah Safieddine, Marie Bouillon, Ana Claudia Parracho, Julien Jumelet, Florent Tencé, Guillaume Herment, Gaetan Heymes, Andrea Pazmino, Florence Goutail, Catherine Wespes, Slimane Bekki, Anne Boynard, Juliette Hadji‐Lazaro, Pierre‐François Coheur, Daniel Hurtmans, Cathy Clerbaux   +15 more
doaj   +1 more source

Ionospheric F‐Layer Scintillation Variabilities Over the American Sector During Sudden Stratospheric Warming Events

Space Weather, 2021
The present study investigates the ionospheric F‐layer scintillation responses in the American sector (90°W–0°, ±50° dip latitude) during the Northern Hemisphere winter sudden stratospheric warming events of 2007–2008, 2008–2009, 2009–2010, and 2012–2013.
Hailun Ye, Xianghui Xue, Tao Yu, Yang‐Yi Sun, Wen Yi, Chi Long, Weifan Zhang, Xiankang Dou   +7 more
doaj   +1 more source

Atmospheric Constituent Data Assimilation in NASA's Goddard Earth Observing System

Earth and Space Science, Volume 13, Issue 8, August 2026.
Abstract Many of today's most significant and urgent scientific questions, including those about the impact of human activity on air quality and radiative forcing, require the synthesis of observations of atmospheric constituents and scientific theory.
B. Weir, K. Wargan, C. A. Keller, K. E. Knowland, P. A. Wales, V. Shah, B. M. Karpowicz, N. Balashov, L. E. Ott, R. Todling, S. E. Cohn, S. Pawson   +11 more
wiley   +1 more source

Sensitivity of Sudden Stratospheric Warmings to Previous Stratospheric Conditions

Journal of the Atmospheric Sciences, 2017
AbstractThe Whole Atmosphere Community Climate Model, version 4 (WACCM4), is used to investigate the influence of stratospheric conditions on the development of sudden stratospheric warmings (SSWs). To this end, targeted experiments are performed on selected modeled SSW events.
Alvaro de la Cámara, John R. Albers, Thomas Birner, Rolando R. Garcia, Peter Hitchcock, Douglas E. Kinnison, Anne K. Smith   +6 more
openaire   +1 more source

Tertiary‐Ozone‐Maximum‐Like Mesospheric Ozone Increases Driven by Solar Eclipses: Sensitivity Experiments on WACCM‐X

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Solar eclipses offer natural experiments to isolate the photochemical response of mesospheric ozone to solar radiation. Using the WACCM‐X model, we performed mechanism‐oriented sensitivity experiments for the 14 December 2020 eclipse to quantify the tertiary‐ozone‐maximum‐like (TOM‐like) response.
T. Yang, T. Nagahama, A. Mizuno, T. Dang, J. Lei, Joseph M. McInerney   +5 more
wiley   +1 more source

Middle‐Atmosphere Dynamics Observed With a Portable Muon Detector

Earth and Space Science, 2019
In the past years, large particle physics experiments have shown that muon rate variations detected in underground laboratories are sensitive to regional, middle‐atmosphere temperature variations.
M. Tramontini, M. Rosas‐Carbajal, C. Nussbaum, D. Gibert, J. Marteau   +4 more
doaj   +1 more source

Impacts of Ionospheric Conductance During the December 2021 Solar Eclipse on the Coupled Magnetosphere‐Ionosphere‐Thermosphere System

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Solar eclipses provide unique opportunities to investigate geospace dynamics driven by rapid, localized reductions in solar radiation. On December 4th $4\text{t}\text{h}$, 2021, a total solar eclipse occurred over West Antarctica during substorms.
Yu Hong, Yue Deng, Daniel T. Welling, Aaron J. Ridley, Gang Lu, Astrid Maute, Qingyu Zhu, Sebastijan Mrak, Colin Waters, Cheng Sheng, Minjing Li, Ramon Lopez   +11 more
wiley   +1 more source

The influence of the equatorial upper stratosphere on stratospheric sudden warmings [PDF]

Geophysical Research Letters, 2003
A stratosphere mesosphere model is used in a set of idealized experiments to investigate the sensitivity of the Northern Hemisphere winter stratospheric flow to the equatorial zonal winds in the upper and the lower stratosphere. Sensitivity is found to the lower stratospheric winds (below 40 km) only in the early part of the model integration as the ...
openaire   +2 more sources

Solar Proton Events Enhance Polar Upper Stratospheric Downward Transport: Evidence From Ozone‐Traced Descent

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract The Brewer‐Dobson circulation (BDC) is a fundamental driver of trace gas transport in the middle atmosphere. Direct quantification of its descent rate remains observationally challenging. Here, we leverage wintertime solar proton events (SPEs) as natural experiments and use ozone‐depletion trajectories as dynamical tracers to quantify polar ...
Yuting Wang, Hui Li, Yaxuan Li, Yudi Pan, Wei Xu, Binbin Ni, Chi Wang   +6 more
wiley   +1 more source