Results 61 to 70 of about 681 (182)

The Coupled Stratosphere–Troposphere Response to Impulsive Forcing from the Troposphere

Journal of the Atmospheric Sciences, 2005
Abstract A simple atmospheric general circulation model (GCM) is used to investigate the transient response of the stratosphere–troposphere system to externally imposed pulses of lower-tropospheric planetary wave activity. The atmospheric GCM is a dry, hydrostatic, global primitive-equations model, whose circulation includes an active ...
Reichler, Thomas, Kushner, Paul J., Polvani, Lorenzo M.   +2 more
openaire   +3 more sources

Probing Atmospheric Gravity‐Wave‐Relevant Representations in a Weather Foundation Model via Multi‐Method Fine‐Tuning

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract Weather foundation models pretrained on reanalysis data may encode subgrid‐scale physics beyond their forecasting objectives. Using Aurora, we probe this with a multi‐method fine‐tuning framework: agreement across structurally different adaptation strategies signals shared backbone information, while a matched randomly initialized control ...
Yanan Guo, Junqiang Song, Chuanfeng Zhao, Xiaoqun Cao, Yikun Yang, Hongze Leng   +5 more
wiley   +1 more source

Hemispheric stationary-eddy activity of the winter North Atlantic oscillation

Environmental Research: Climate
The winter North Atlantic Oscillation (NAO), key driver of climate variability in the Euro-Atlantic sector, remains unsettled as to its spatio-temporal characteristics in the Northern Hemisphere.
M Brotons, J García-Serrano, R J Haarsma   +2 more
doaj   +1 more source

The tropospheric response to zonally asymmetric momentum torques: implications for the downward response to wave reflection and SSW events [PDF]

Weather and Climate Dynamics
The role of zonal structure in the stratospheric polar vortex for the surface response to weak vortex states and concurrently occurring wave reflection events is isolated using an intermediate-complexity moist general circulation model.
W. Ning, C. I. Garfinkel, J. Cohen, J. Cohen, I. P. White, J. Rao   +5 more
doaj   +1 more source

Multidecadal Changes in Atmospheric Dryness Over East Asia Dominated by Internal Climate Variability

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract Summer near‐surface vapor pressure deficit (VPD), a key measure of atmospheric dryness, has increased markedly across East Asia since 1980, yet the relative roles of external forcing and internal variability (IV) in its multidecadal changes remain unclear.
Xi Wang, Wenjian Hua, Aiguo Dai, Lu Zhou, Minhua Qin, Haishan Chen   +5 more
wiley   +1 more source

Stratosphere-troposphere coupling under the extreme conditions of the No-Montreal-Protocol scenario

, 2023
The Montreal Protocol and its amendments (MPA) have been a major success in preventing serious health damage from the destruction of the stratospheric ozone layer by chlorofluorocarbons (CFCs). Additionally, unabated CFC emissions would have significantly accelerated global warming and affected large-scale tropospheric circulation.
Timofei Sukhodolov, Franziska Zilker, Gabriel Chiodo, Tatiana Egorova, Marina Friedel, Eugene Rozanov, Jan Sedlacek, Svenja Seeber, Thomas Peter   +8 more
openaire   +2 more sources

Interannual Influence of Antarctic Sea Ice on Southern Hemisphere Stratosphere‐Troposphere Coupling

Geophysical Research Letters
While weakening of the boreal polar vortex may be caused by autumnal Arctic sea ice loss, less is known about the interannual influence of Antarctic sea ice on stratosphere‐troposphere coupling in the Southern Hemisphere.
Divya Rea, Dillon Elsbury, Amy H. Butler, Lantao Sun, Yannick Peings, Gudrun Magnusdottir   +5 more
doaj   +1 more source

Super Warm Early Eocene Simulations With HadGEM3‐GC31‐LL

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 19, 16 October 2026.
Abstract The early Eocene Climatic Optimum (EECO; 53.3–49.1 million years ago) represents the period of greatest sustained warmth in the Cenozoic (last 66 million years), with proxy‐data indicating global‐mean temperatures 10–16°C above preindustrial and atmospheric CO2 ${\text{CO}}_{2}$ concentrations of 1,200–2,500 ppmv.
Sebastian Steinig, Charles J. R. Williams, Natalie J. Burls, Marlow J. Cramwinckel, Alex Farnsworth, Gavin L. Foster, Peter O. Hopcroft, Gordon N. Inglis, Caroline H. Lear, Annette Osprey, Richard D. Pancost, Zikun Ren, William H. G. Roberts, Alistair A. Sellar, Emma L. Stone, Richard Wood, Jiang Zhu, Daniel J. Lunt   +17 more
wiley   +1 more source

Intraseasonal Linkages of Winter Surface Air Temperature Between Eurasia and North America

Geophysical Research Letters
Wintertime temperature extremes sometimes show a continental linkage between Eurasia and North America (NA), but whether these connections are coincidental or dynamically robust remains unclear.
Xiaocen Shen, Lin Wang, Adam A. Scaife, Steven C. Hardiman   +3 more
doaj   +1 more source

A Generation Mechanism of Thorpe‐Detected Turbulence: A Case Study Using WRF Model Simulation

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract Turbulence in the free atmosphere has been widely estimated using the Thorpe method, which identifies vertical inversions in potential temperature profiles as evidence of overturning. However, the mechanisms driving Thorpe‐detected turbulence remain poorly understood, due largely to limitations in spatial and temporal resolution of ...
Han‐Chang Ko, Hye‐Yeong Chun
wiley   +1 more source