Results 81 to 90 of about 34,894 (282)

EnKF and expectation‐maximization based parameter estimation of a convective gravity‐wave parameterization using Strateole 2 constant‐level balloon data

Quarterly Journal of the Royal Meteorological Society, EarlyView.
An offline methodology is applied to estimate parameters of a convective gravity‐wave scheme using momentum flux (MF) observations from constant‐level balloons (left panels: pdfs of east and west MFs in green from observations and black from EnKF). The approach integrates an ensemble Kalman filter with an expectation‐maximization algorithm and permits ...
F. Lott, P. Tandeo, M. Pulido, D. Bardet
wiley   +1 more source

Moist bias in the Pacific upper troposphere and lower stratosphere (UTLS) in climate models affects regional circulation patterns [PDF]

Atmospheric Chemistry and Physics
Water vapour in the upper troposphere and lower stratosphere (UTLS) is a key radiative agent and a crucial factor in the Earth's climate system. Here, we investigate a common regional moist bias in the Pacific UTLS during Northern Hemisphere summer in ...
F. Ploeger, F. Ploeger, T. Birner, E. Charlesworth, P. Konopka, R. Müller   +5 more
doaj   +1 more source

Improved predictability of the troposphere using stratospheric final warmings [PDF]

, 2011
The final warming of the stratospheric polar vortex at the end of northern hemisphere winter is examined in ECMWF ERA-Interim reanalysis data and an ensemble of chemistry climate models, using 20 years of data from each.
Braesicke, Peter, Michou, M., Shaw, T., Peter Braesicke, Hardiman, S. C., Hardiman, S., Martyn Chipperfield, Akiyoshi, Hideharu, Garcia, Rolando R., Shaw, Tiffany A., Garcia, R., Hideharu Akiyoshi, Martin Dameris, Chipperfield, Martyn, Kiyotaka Shibata, Neal Butchart, Shaw, T. A., Hardiman, Steven, Tiffany A. Shaw, Slimane Bekki, Akiyoshi, H., Charlton-Perez, A., Baumgaertner, Andreas, Hardiman, Steven C., Braesicke, P., Dameris, Martin, Baumgaertner, A., Chipperfield, M., Garcia, R. R., Bekki, Slimane, Butchart, Neal, Eugene Rozanov, Charlton‐Perez, Andrew J., Butchart, Neil, Steven C. Hardiman, Dameris, M., Steven Pawson, Andrew J. Charlton-Perez, Bekki, S., Andreas Baumgaertner, Rozanov, Eugene, Martine Michou, Rolando R. Garcia, Charlton-Perez, Andrew J., Shibata, Kiyotaka, Shibata, K., Pawson, Steven, Butchart, N., Rozanov, E., Michou, Martine, Pawson, S., Charlton-Perez, A. J.   +51 more
core   +1 more source

Dry intrusions and warm‐core development in Medicanes: Insights from a multi‐case analysis and the peculiar evolution of Ianos

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Mediterranean tropical‐like cyclones show a clear seasonality, with September cyclones exhibiting the deepest convection and Ianos representing the most extreme case. While one or more dry intrusions are typically detected during the cyclone life cycle, Ianos instead features two much weaker descending airflows.
Daniele Nigro, Lorenzo Giovannini, Simona Bordoni, Stavros Dafis, Mario Marcello Miglietta   +4 more
wiley   +1 more source

Asymmetry in the effect of North Atlantic sea surface temperature on the eddy‐driven jet

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Projections of climate over Europe and the Atlantic are uncertain due to the uncertainty surrounding future changes in North Atlantic sea surface temperatures (SSTs). Here, we demonstrate that warming in the North Atlantic Ocean is linked to a transition to a negative phase of the North Atlantic Oscillation, as well as to an equatorward displacement of
Paul‐Arthur Monerie, Jon Robson, Christopher O'Reilly, Rowan Sutton   +3 more
wiley   +1 more source

Chlorine peroxide reaction explains observed wintertime hydrogen chloride in the Antarctic vortex

Communications Earth & Environment
It is well established that the drastic ozone loss in the Antarctic stratosphere, commonly known as the ozone hole, is primarily driven by gas-phase and heterogeneous chemical processes. While chemistry transport models generally reproduce observed ozone
Jens-Uwe Grooß, Rolf Müller, John N. Crowley, Michaela I. Hegglin   +3 more
doaj   +1 more source

Ultrathin Tropical Tropopause Clouds (UTTCs) : I. Cloud morphology and occurrence [PDF]

, 2003
Subvisible cirrus clouds (SVCs) may contribute to dehydration close to the tropical tropopause. The higher and colder SVCs and the larger their ice crystals, the more likely they represent the last efficient point of contact of the gas phase with the ice
V. A. Yushkov, Santacesaria, Vincenzo, Flentje, H., Adriani, A., Luo, Beiping, C. Kiemle, Di Donfrancesco, Guido, Khattatov, Vyacheslav, Toci, Guido, R. A. MacKenzie, Volk, C.M., MacKenzie, R., Schiller, C., MacKenzie, R. A., Th. Peter, Carslaw, Kenneth S., Santacesaria, V., H. Flentje, Yushkov, Vladimir, Borrmann, Stephan, MacKenzie, Robert A., MacKenzie, A.R., Luo, B. P., Kiemle, Christoph, Mazzinghi, Piero, Cairo, F., Yushkov, Vladimir A., Carslaw, K., Flentje, Harald, Rudakov, Vladimir V., T. Trautmann, Noone, K., Noone, Kevin, Luo, B., P. Mazzinghi, K. Noone, Ström, J., Kiemle, C., Thomas, Andreas, G. Toci, Mazzinghi, P., Di Don-Francesco, Guido, Beuermann, J., C. Schiller, Mitev, V., Wirth, M., Khattatov, V., Trautmann, T., S. Borrmann, Volk, C.-Michael, J. Beuermann, Wernli, H., Di Donfrancesco, G., Carslaw, K.S., Schiller, Cornelius, C. M. Volk, Peter, Thomas, V. Rudakov, F. Cairo, Thomas, A., Stefanutti, Leopoldo, Trautmann, Thomas, Cairo, Francesco, MacKenzie, Robert, Strom, Johan, Carslaw, K. S., Di Don-Francesco, G., B. P. Luo, Beuermann, Jürgen, A. Adriani, Borrmann, S., Rudakov, V., J. Strom, Volk, C., V. Mitev, V. Santacesaria, V. Khattatov, Peter, Th., Yushkov, V., K. S. Carslaw, Volk, C. M., A. Thomas, L. Stefanutti, Adriani, Alberto, M. Wirth, Peter, T., Yushkov, V. A., Stefanutti, L., G. Di Donfrancesco, Toci, G., Wirth, Martin, Mitev, Valentin   +91 more
core   +2 more sources

Characteristics of upper‐level updrafts and downdrafts in the anvils of tropical deep convective clouds

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study investigates the thermodynamic and microphysical characteristics of updrafts and downdrafts of tropical deep convective anvil clouds using in situ measurements. We found that parts of the downdrafts are in ice supersaturation in these clouds.
Sreehari Kizhuveettil, Jordi Vila‐Guerau de Arellano, Martina Krämer, Armin Afchine, Luiz A. T. Machado, Martin Zöger, Wiebke Frey   +6 more
wiley   +1 more source

NASA GEOS Composition Forecast Modeling System GEOS‐CF v1.0: Stratospheric Composition

Journal of Advances in Modeling Earth Systems, 2022
The NASA Goddard Earth Observing System (GEOS) Composition Forecast (GEOS‐CF) provides recent estimates and 5‐day forecasts of atmospheric composition to the public in near‐real time.
K. E. Knowland, C. A. Keller, P. A. Wales, K. Wargan, L. Coy, M. S. Johnson, J. Liu, R. A. Lucchesi, S. D. Eastham, E. Fleming, Q. Liang, T. Leblanc, N. J. Livesey, K. A. Walker, L. E. Ott, S. Pawson   +15 more
doaj   +1 more source

Further development of adaptive parameter tuning in the numerical weather prediction models of Deutscher Wetterdienst

Quarterly Journal of the Royal Meteorological Society, EarlyView.
The introduction of adaptive parameter tuning in the numerical weather prediction models of DWD in 2022 substantially improved the forecast quality of near‐surface variables like 2‐m temperature and 2‐m humidity. Since 2023, refinements and extensions, primarily affecting the surface evaporation and its diurnal cycle, have led to further advances ...
Günther Zängl
wiley   +1 more source