Results 91 to 100 of about 72,276 (272)

Stratospheric polar vortices

, 2010
The intense cyclonic vortices that form over the winter pole are one of the most prominent features of the stratospheric circulation. The structure and dynamics of these “polar vortices” play a dominant role in the winter and spring stratospheric circulation and are key to determining distribution of trace gases, in particular ozone, and the couplings ...
Waugh, Darryn W., Polvani, Lorenzo M.
openaire   +2 more sources

Quantifying transport into the lowermost stratosphere using simultaneous in-situ measurements of SF6 and CO2 [PDF]

, 2008
The seasonality of transport and mixing of air into the lowermost stratosphere (LMS) is studied using distributions of mean age of air and a mass balance approach, based on in-situ observations of SF6 and CO2 during the SPURT (Spurenstofftransport in der
Birner, Thomas, Bönisch, Harald, Curtius, Joachim, Engel, Andreas, Hoor, Peter   +4 more
core   +1 more source

Forecast verification using information and noise

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Verification of weather forecasts is usually expressed in terms of total error metrics. This is useful for end users of the forecasts but does not allow evaluation of the intrinsic information content of the forecasts. To overcome this limitation, we propose a new total error decomposition into information and noise error measures, connect it to ...
Massimo Bonavita, Alan J. Geer
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

A quasi-Lagrangian coordinate system based on high resolution tracer observations: implementation for the Antarctic polar vortex [PDF]

, 2008
In order to quantitatively analyse the chemical and dynamical evolution of the polar vortex it has proven extremely useful to work with coordinate systems that follow the vortex flow.
Ivanova, Elena V., Klein, Holger, Möbius, Tanja, Ravegnani, Fabrizio, Riediger, Oliver, Schmidt, Ulrich (Prof. Dr.), Sitnikov, Nikolay, Ulanovskii, Alexey, Volk, C.-Michael, Yushkov, Vladimir   +9 more
core  

On the structural changes in the Brewer-Dobson circulation after 2000 [PDF]

, 2010
In this paper we present evidence that the observed increase in tropical upwelling after the year 2000 may be attributed to a change in the Brewer-Dobson circulation pattern.
Birner, Thomas, Bönisch, Harald, Engel, Andreas, Hoor, Peter, Ray, Eric A., Tarasick, David W.   +5 more
core   +2 more sources

Operational all‐sky assimilation of geostationary infrared water‐vapour channels in the regional ICON‐D2 model with an ensemble Kalman filter

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Though many studies have shown potential benefit in assimilating all‐sky infrared radiances from geostationary satellites, at numerical weather prediction centres it is still common practice to assimilate clear‐sky radiances. We present the operationalization of the all‐sky assimilation of the spinning enhanced visible and infrared imager (SEVIRI ...
Annika Schomburg, Christoph Schraff, Christina Köpken‐Watts, Klaus Stephan, Liselotte Schühl, Robin Faulwetter   +5 more
wiley   +1 more source

A dynamics-based separation of deep and shallow stratospheric circulation branches [PDF]

Atmospheric Chemistry and Physics
The wave-driven Brewer–Dobson circulation plays a crucial role in determining the transport of trace gases and aerosols in the stratosphere. We examine the structure of the circulation based on reanalysis data (ERA5, ERA-Interim, MERRA2, and JRA55) and ...
R. Baikhadzhaev, F. Ploeger, F. Ploeger, P. Preusse, M. Ern, T. Birner, T. Birner   +6 more
doaj   +1 more source

Flatness of the setting Sun [PDF]

, 2002
Atmospheric refraction is responsible for the bending of light-rays in the atmosphere. It is a result of the continuous decrease in the refractive index of the air as a function of altitude.
Györi L., S. Volkán-Kacsó, Thomas M. E., Z. Néda   +3 more
core   +2 more sources

Using a causal effect network approach to quantify the impact of ENSO teleconnections on summer monsoon precipitation over the Himalayas and key regional circulations

Quarterly Journal of the Royal Meteorological Society, EarlyView.
We quantified the causal effect (CE) of linkages between four monthly climate indices ENSO, SMHP, RWC, and MHC for 1940–2022 with a time lag of one month. The results show CE values from (1) ENSO to SMHP of −0.33$$ -0.33 $$ to −0.44$$ -0.44 $$ (i.e., a one standard deviation (SD) increase in ENSO causes a decrease in SMHP of −0.33$$ -0.33 $$ to −0.44$$
Grzegorz Muszynski, Andrew Orr, Indrani Roy, Giorgia Di Capua, Hamish D. Pritchard, J. Scott Hosking   +5 more
wiley   +1 more source