Results 61 to 70 of about 2,944 (222)

The predictability of the extratropical stratosphere on monthly time-scales and its impact on the skill of tropospheric forecasts [PDF]

, 2016
This is the final version of the article. Available from Wiley via the DOI in this record.Extreme variability of the winter- and spring-time stratospheric polar vortex has been shown to affect extratropical tropospheric weather.
Baldwin, M, Charlton-Perez, A, Charron, M, Eckermann, SD, Gerber, E, Harrison, RG, Jackson, DR, Kim, B-M, Kuroda, Y, Lang, A, Mahmood, S, Mizuta, R, Roff, G, Sigmond, M, Son, S-W, Tripathi, OP   +15 more
core   +1 more source

Windows of opportunity in subseasonal weather regime forecasting: A statistical–dynamical approach

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study explores how the atmospheric state at initialisation creates windows of opportunity for improving week 3 forecasts of weather regime activity. Greenland blocking activity increases following Madden–Julian Oscillation phases 7, 8, and 1 and weak stratospheric polar vortex states, revealing patterns exploitable by statistical models.
Fabian Mockert, Christian M. Grams, Sebastian Lerch, Julian Quinting   +3 more
wiley   +1 more source

Observed response of stratospheric and mesospheric composition to sudden stratospheric warmings [PDF]

Journal of Atmospheric and Solar-Terrestrial Physics, 2019
Abstract In this study we investigate and quantify the statistical changes that occur in the stratosphere and mesosphere during 37 sudden stratospheric warming (SSW) events from 1989 to 2016. We consider changes in the in-situ ozonesonde observations of the stratosphere from four sites in the northern hemisphere (Ny-Alesund, Sodankyla, Lerwick, and ...
Denton, M.H., Kivi, R., Ulich, T., Rodger, C.J., Clilverd, Mark, Denton, J.S., Lester, M.   +6 more
openaire   +2 more sources

The effect of interactive ozone chemistry on weak and strong stratospheric polar vortex events [PDF]

Atmospheric Chemistry and Physics, 2020
Modeling and observational studies have reported effects of stratospheric ozone extremes on Northern Hemisphere spring climate. Recent work has further suggested that the coupling of ozone chemistry and dynamics amplifies the surface response to ...
J. Oehrlein, G. Chiodo, G. Chiodo, L. M. Polvani   +3 more
doaj   +1 more source

The association between stratospheric weak polar vortex events and cold air outbreaks

, 2009
Previous studies have identified an association between near-surface temperature anomalies in the Northern Hemisphere and weak stratospheric polar westerlies.
Baldwin, Baldwin, Baldwin, Barnett, Bracegirdle, Bueh, Cai, Cellitti, Charlton, Charney, Chen, Chen, Cohen, Cordero, Garfinkel, Hurrell, Hurrell, Jeong, Kalnay, Kenyon, Kolstad, Konrad, Kuroda, Limpasuvan, Limpasuvan, Lorenz, Martius, Matsuno, Matsuno, McIntyre, Mercer, Mukougawa, Otterå, Pickart, Pinto, Polvani, Reichler, Renfrew, Scaife, Scaife, Skogseth, Song, Stephenson, Takaya, Thompson, Thompson, Thompson, Walsh   +47 more
core   +1 more source

Assessing the impact of model biases on subseasonal forecast skill

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Relaxation experiments where the nudging was performed towards bias‐corrected integrations of the same model display significantly improved skill at weeks 3 and 4, particularly in the northern extratropics. This indicates that there is a large potential for improving dynamical subseasonal forecasting skill by improved treatment of model biases.
Frédéric Vitart, Magdalena Balmaseda
wiley   +1 more source

Exceptionally poor and good medium‐range forecasts of the large‐scale circulation over Europe in ERA5 reforecasts

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study investigates year‐round exceptionally poor and good day‐6 forecasts of the 500‐hPa geopotential height field over Europe using 45 years of ERA5 reforecasts and applies a weather regime perspective to analyse large‐scale pattern evolution and regime transitions.
Seraphine Hauser, Steven M. Cavallo, Linus Magnusson, Jonathan E. Martin, David B. Parsons   +4 more
wiley   +1 more source

Association of the 11-year solar cycle with correlation and teleconnection structures in tropospheric circulation

Journal of Space Weather and Space Climate
Analyzing spatial correlation structures and teleconnections in the 500 hPa heights of the Northern Hemisphere Extratropics in winter shows substantial differences between months with high and low solar activity.
Huth Radan, Stryhal Jan
doaj   +1 more source

Observation of the Ionosphere in Middle Latitudes during 2009, 2018 and 2018/2019 Sudden Stratospheric Warming Events

Atmosphere, 2021
The ionospheric weather is affected not only from above by the Sun but also from below by processes in the lower-lying atmospheric layers. One of the most pronounced atmospheric phenomena is the sudden stratospheric warming (SSW).
Zbyšek Mošna, Ilya Edemskiy, Jan Laštovička, Michal Kozubek, Petra Koucká Knížová, Daniel Kouba, Tarique Adnan Siddiqui   +6 more
doaj   +1 more source

Rare Lightning and Convection Characteristics During Two Successive Tornadoes in Southern China

High Voltage, EarlyView.
ABSTRACT Systematic investigations into lightning characteristics of tornado storms in China remain scarce. This study comprehensively analyses rare lightning behaviour and overshooting top characteristics for two successive tornadoes during a long‐lived supercell in southern China on 27 April 2024.
Fengquan Li, Jiangling Zhi, Yu Wang, Hantao Tao, Zhaoming Li, Shanqiang Gu, Zhe Li, Zeyu Zhang, Lei Zhang, Guoying Tang   +9 more
wiley   +1 more source