Results 51 to 60 of about 9,396 (179)

Long-term climatology of air mass transport through the Tropical Tropopause Layer (TTL) during NH winter [PDF]

, 2007
A long-term climatology of air mass transport through the tropical tropopause layer (TTL) is presented, covering the period from 1962–2005. The transport through the TTL is calculated with a Lagrangian approach using radiative heating rates as vertical ...
Krüger, Kirstin, Rex, Markus, Tegtmeier, Susann   +2 more
core   +3 more sources

Elliptical Orbit Representation for the Annual Evolution of the Northern Hemisphere Stratospheric Polar Vortex. Part I: Diagnosing Interannual Variability

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract Using a single annual frequency with each year defined from July 1 to June 30 of the following calendar year, this study fits an ellipse to the yearly phase space trajectory of the daily time series of MU (stratospheric mass‐weighted zonally integrated zonal wind at 60°N) and M (total polar stratospheric air mass over 60–90°N) to represent the
Michael Secor, Jie Sun, Yueyue Yu, Zhaohua Wu, Ming Cai   +4 more
wiley   +1 more source

Role of the quasi-biennial oscillation in alleviating biases in the semi-annual oscillation [PDF]

Weather and Climate Dynamics
Model representations of the stratospheric semi-annual oscillation (SAO) show a common easterly bias, with a weaker westerly phase and stronger easterly phase compared to observations.
A. M. Jaison, A. M. Jaison, L. J. Gray, L. J. Gray, S. M. Osprey, S. M. Osprey, J. R. Knight, M. B. Andrews   +7 more
doaj   +1 more source

Quasi-Biennial Oscillation and Sudden Stratospheric Warmings during the Last Glacial Maximum

Atmosphere, 2020
The quasi-biennial oscillation (QBO) and sudden stratospheric warmings (SSWs) during the Last Glacial Maximum (LGM) are investigated in simulations using the Whole Atmosphere Community Climate Model version 6 (WACCM6).
Qiang Fu, Mingcheng Wang, Rachel H. White, Hamid A. Pahlavan, Becky Alexander, John M. Wallace   +5 more
doaj   +1 more source

Statistical evidence links exceptional 1995 Atlantic hurricane season to record sea warming [PDF]

, 2004
Tropical cyclones rank above earthquakes as the major geophysical cause of loss of life and property (Bryant, 1991; Houghton, 1994). In the United States alone, the damage bill from mainland landfalling hurricanes over the last 50 years averages $2.0 ...
Harris, AR, Saunders, MA
core   +1 more source

Elliptical Orbit Representation for the Annual Evolution of the Northern Hemisphere Stratospheric Polar Vortex. Part II: Long‐Lead Forecasts of Wintertime S2S Anomalies

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract In Part I, we represent the annual evolution of the Northern Hemisphere stratospheric polar vortex (SPV) in individual years using an ellipse, defined through six ellipse parameters, for the phase‐space trajectory of the daily time series of MU (mass‐weighted zonally integrated zonal wind at 60°N above 400 K) and M (stratospheric air mass over
Michael Secor, Jie Sun, Yueyue Yu, Zhaohua Wu, Ming Cai   +4 more
wiley   +1 more source

A Puzzling Quasi‐Periodic Variability in the Tropical Middle Atmosphere

Geophysical Research Letters
The Quasi‐Biennial Oscillation and the Semiannual Oscillation have been identified to be the leading modes of variability in the tropical middle atmosphere.
N. Koushik, K. Kishore Kumar
doaj   +1 more source

Beyond Geostrophic and Gradient Wind: Enhancing the Estimation of Climatic Wind Fields From Radio Occultation

Earth and Space Science, Volume 13, Issue 3, March 2026.
Abstract Wind approximations, such as geostrophic and gradient wind, are limited in their ability to accurately represent atmospheric conditions in the presence of significant planetary wave activity. Those approximations, while widely applied in synoptic‐scale wind field estimation, fail to capture the full complexity of atmospheric dynamics under ...
Johannes Unegg, I. Nimac, J. Danzer
wiley   +1 more source

An Idealized Two‐Dimensional Atmospheric Model of the Quasi‐Biennial Oscillation and Wave‐Mean Flow Interactions in the Equatorial Channel

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 3, March 2026.
Abstract The quasi‐biennial oscillation (QBO) is a fundamental mode of atmospheric variability and a textbook example of wave‐mean flow interactions. While its general theory has been established about 50 years ago by the seminal works of Holton, Lindzen and Plumb (HLP), it remains an unsettled problem of geophysical fluid dynamics and a challenge for ...
Vincent Brémaud, Aurélien Podglajen, Albert Hertzog, Riwal Plougonven   +3 more
wiley   +1 more source

Cross-scale causal information flow from the El Niño–Southern Oscillation to precipitation in eastern China [PDF]

Earth System Dynamics
The El Niño–Southern Oscillation (ENSO) is a dominant mode of climate variability influencing temperature and precipitation in distant parts of the world. Traditionally, the ENSO influence is assessed considering its amplitude.
Y. Latif, K. Fan, K. Fan, G. Wang, M. Paluš   +4 more
doaj   +1 more source