Results 41 to 50 of about 1,013 (182)

Weakening of the stratospheric polar vortex by Arctic sea-ice loss [PDF]

Nature Communications, 2014
Successive cold winters of severely low temperatures in recent years have had critical social and economic impacts on the mid-latitude continents in the Northern Hemisphere. Although these cold winters are thought to be partly driven by dramatic losses of Arctic sea-ice, the mechanism that links sea-ice loss to cold winters remains a subject of debate.
Kim, BM, Son, SW, Min, SK, Jeong, JH, Kim, SJ, Zhang, XD, Shim, T, Yoon, JH   +7 more
openaire   +4 more sources

Tropospheric forcing of the boreal polar vortex splitting in January 2003 [PDF]

Annales Geophysicae, 2010
The dynamical evolution of the relatively warm stratospheric winter season 2002–2003 in the Northern Hemisphere was studied and compared with the cold winter 2004–2005 based on NCEP-Reanalyses.
D. H. W. Peters, P. Vargin, A. Gabriel, N. Tsvetkova, V. Yushkov   +4 more
doaj   +1 more source

Rossby Waves in Total Ozone over the Arctic in 2000–2021

Remote Sensing, 2022
The purpose of this work is to study Rossby wave parameters in total ozone over the Arctic in 2000–2021. We consider the averages in the January–March period, when stratospheric trace gases (including ozone) in sudden stratospheric warming events are ...
Chenning Zhang, Asen Grytsai, Oleksandr Evtushevsky, Gennadi Milinevsky, Yulia Andrienko, Valery Shulga, Andrew Klekociuk, Yuriy Rapoport, Wei Han   +8 more
doaj   +1 more source

Attribution of subseasonal cold‐spell forecasts to remote drivers using nudging experiments

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Nudging experiments with the European Centre for Medium‐Range Weather Forecasts (ECMWF) model show that Northern European cold spells can arise from different drivers. Some events are predominantly influenced by stratospheric dynamics, while others also involve important tropospheric processes.
Irene Erner, Alexey Karpechko, Inna Polichtchouk, Frédéric Vitart   +3 more
wiley   +1 more source

A three-dimensional model comparison of PSC processing during the Arctic winters of 1991/1992 and 1992/1993 [PDF]

Annales Geophysicae, 1994
A three-dimensional transport model has been used to compare and contrast the extent of processing by polar stratospheric clouds during the northern hemisphere winters of 1991/1992 and 1992/1993.
M. P. Chipperfield
doaj   +1 more source

Revisiting the Contrasting Response of Polar Stratosphere to the Eastern and Central Pacific El Niños

Atmosphere, 2022
El Niño Southern Oscillation (ENSO) invokes the release of a large amount of heat and moisture into the tropical atmosphere, inducing circulation anomalies.
Maria Kolennikova, Daria Gushchina
doaj   +1 more source

Synoptic and large‐scale drivers of extreme precipitation events in the Himalayas

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Months associated with maximum frequency of extreme precipitation events (EPEs). 6102 extreme precipitation days (i.e., exceeding 99th percentile for daily precipitation) occurred across the Karakoram, Western Himalayas (WH), Central Himalayas (CH) and Eastern Himalayas (EH) during 1979 to 2023.
Priya Bharati, Pranab Deb, Kieran M. R. Hunt   +2 more
wiley   +1 more source

Assessment of subseasonal forecast skill of tropical–extratropical cloud bands over the four subtropical convergence zones

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study evaluates the subseasonal predictive skill of tropical–extratropical cloud bands across four subtropical convergence zones in ECMWF reforecasts (2003–2022). Results show that, while exact daily predictions are limited to one week, accounting for temporal displacement improves forecast skill significantly, revealing a systematic early onset ...
Romain Pilon, Daniela I.V. Domeisen
wiley   +1 more source

A thermodynamic climatology of the disturbed stratospheric polar vortex

International Journal of Climatology, 2019
A climatology of polar vortex disturbances in the Northern Hemisphere winter stratosphere is constructed from MERRA2 Reanalysis data for the winter seasons of 1981–2017. Sixty disturbances (splits or displacements) of the polar vortex are identified during the 37 winter seasons using geometric moments of stratospheric potential vorticity.
Thomas S. Ehrmann, Stephen J. Colucci
openaire   +2 more sources

Stratosphere-troposphere coupling during stratospheric extremes in the 2022/23 winter

Weather and Climate Extremes, 2023
Using the ERA5 reanalysis, sea surface temperature, sea ice observations, and the real-time multivariate Madden-Julian Oscillation (MJO) index, the evolution of the stratospheric extreme circulation in the winter of 2022/2023 is explored.
Qian Lu, Jian Rao, Chunhua Shi, Rongcai Ren, Yimin Liu, Siming Liu   +5 more
doaj   +1 more source