Results 51 to 60 of about 1,935 (190)

Seasonal Predictability over Europe Arising from El Nino and Stratospheric Variability in the MPI-ESM Seasonal Prediction System [PDF]

, 2014
Predictability on seasonal time scales over the North Atlantic–Europe region is assessed using a seasonal prediction system based on an initialized version of the Max Planck Institute Earth System Model (MPI-ESM).
Baehr, Johanna, Bittner, Matthias, Butler, Amy H., Domeisen, Daniela I.V., Fröhlich, Kristina, Müller, Wolfgang A.   +5 more
core   +1 more source

Tropical cooling in the case of stratospheric sudden warming in January 2009: focus on the tropical tropopause layer [PDF]

, 2011
Temperature changes in the tropics, especially in the tropical tropopause layer, are investigated at the time of a major stratospheric sudden warming (SSW) event that started on about 16 January 2009. During the SSW, the temperature in the tropical upper
K. Yamazaki, K. Yoshida
core   +2 more sources

Solar quiet current response in the African sector due to a 2009 sudden stratospheric warming event [PDF]

, 2016
We present solar quiet (Sq) variation of the horizontal (H) magnetic field intensity deduced from Magnetic Data Acquisition System (MAGDAS) records over Africa during an unusual strong and prolonged 2009 sudden stratospheric warming (SSW) event.
Amory-Mazaudier, C., Bolaji, O.S., Fujimoto, A., Okoh, D., Onanuga, O.K., Owolabi, O.P., Oyeyemi, E.O., Rabiu, A.B., Seemala, G.K., Yamazaki, Yosuke, Yoshikawa, A.   +10 more
core   +4 more sources

A Minimal, Adiabatic Example of Sudden Stratospheric Warming

Journal of Advances in Modeling Earth Systems
Sudden Stratospheric Warming (SSW) are extreme weather events that can significantly impact weather patterns on short to subseasonal to seasonal timescales. In this study, we present a new idealized test case of a Sudden Stratospheric Warming (SSW) event
Joseph Mouallem, Weiye Yao, Lucas Harris, Shian‐Jiann Lin, Xi Chen   +4 more
doaj   +1 more source

Enhancement of Arctic surface ozone during the 2020–2021 winter associated with the sudden stratospheric warming

Environmental Research Letters, 2023
Surface ozone is an important pollutant causing damage to human health and ecosystems. Here, we find that the Arctic surface ozone during the 2020–2021 winter was evidently enhanced after the sudden stratospheric warming (SSW) onset based on reanalysis ...
Yan Xia, Fei Xie, Xiao Lu
doaj   +1 more source

Long-term variation of Arctic Sudden Stratospheric Warmings (SSW) and potential causes

Earth and Planetary Physics
Utilizing the European Centre for Medium-Range Weather Forecast (ECMWF) Reanalysis v5 (ERA5), for the first time, we have confirmed close links among Sudden Stratospheric Warmings (SSWs) in the Northern Hemisphere (NH), the polar vortices, and stratospheric Planetary Waves (PWs) by analyzing and comparing their trends.
QingRan Li, ShaoDong Zhang, KaiMing Huang, ChunMing Huang, Yun Gong, WenTao Tang, Zheng Ma   +6 more
openaire   +2 more sources

Contribution of stratospheric warmings to temperature trends in the middle atmosphere from the lidar series obtained at Haute-Provence Observatory (44°N) [PDF]

, 2012
International audienceThis study describes a method to calculate long-term temperature trends, as an alternative to the ones based on monthly mean temperatures, which are highly impacted by the high winter variability partially due to wave-mean flow ...
Angot, Guillaume, Claud, Chantal, Hauchecorne, Alain, Keckhut, Philippe   +3 more
core   +4 more sources

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

Stratospheric and tropospheric seasonality and its implications for observation requirements in numerical weather prediction

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Daily time series of zonal‐mean zonal wind (m·s−1) at 10 hPa and 60° N from 1950 to 2021 from the ERA5 reanalysis. This shows huge variability in some seasons and very little in others. We provide evidence that high‐level observations, radiosonde and satellite, are more important during the extended winter season with its very large variability ...
Bruce Ingleby, Inna Polichtchouk
wiley   +1 more source

Modeling of the effect of internal gravity waves on upper atmospheric conditions during sudden stratospheric warming

Solar-Terrestrial Physics, 2016
We present results of modeling of the effect of internal gravity waves (IGW), excited in the region of development of a sudden stratospheric warming (SSW), on upper atmospheric conditions.
Vasilyev P.A., Karpov I.V., Kshevetskii S.P.   +2 more
doaj   +1 more source