Results 61 to 70 of about 66,671 (212)

Structural changes in the shallow and transition branch of the Brewer–Dobson circulation induced by El Niño [PDF]

Atmospheric Chemistry and Physics, 2019
The stratospheric Brewer–Dobson circulation (BDC) determines the transport and atmospheric lifetime of key radiatively active trace gases and further impacts surface climate through downward coupling.
M. Diallo, M. Diallo, P. Konopka, M. L. Santee, R. Müller, M. Tao, K. A. Walker, B. Legras, M. Riese, M. Ern, F. Ploeger, F. Ploeger   +11 more
doaj   +1 more source

The Rich Chemistry of Ionized Methanol With Sulfur Dioxide: Pathways to Prebiotic and Elusive Species in Earth's Atmosphere and Space

Chemistry – A European Journal, EarlyView.
The reaction between the methanol radical cation and sulfur dioxide is remarkably fast and forms several ionic and neutral products (HOSOH+, CH2OSO+, CH2OH+, CH2O, H2O, HSO2). The chemistry goes beyond simple proton or hydrogen transfer, revealing a close interaction between the two species, relevant to atmospheric and astrochemical environments where ...
Mauro Satta, Daniele Catone, Mattea Carmen Castrovilli, Antonella Cartoni   +3 more
wiley   +1 more source

The strength of the meridional overturning circulation of the stratosphere

Nature Geoscience, 2017
The distribution of gases such as ozone and water vapour in the stratosphere — which affect surface climate — is influenced by the meridional overturning of mass in the stratosphere, the Brewer–Dobson circulation.
M. Linz, R. A. Plumb, E. Gerber, F. Haenel, G. Stiller, D. Kinnison, A. Ming, J. Neu, J. Neu   +8 more
semanticscholar   +1 more source

Machine Learning‐Based Correction of Reanalysis Surface Radiation Fluxes Using Ground‐Measured Data in the Southern Brazilian Pampa Biome

International Journal of Climatology, EarlyView.
This study demonstrates that ERA5 provides more accurate surface radiation flux estimates than MERRA2 across the Southern Brazilian Pampa. Machine learning models, particularly Random Forest, further improved the precision of reanalysis data for climate applications.
Olusola Samuel Ojo, Michel Baptistella Stefanello, Alecsander Mergen, Maria Eduarda Oliveira Pinheiro, Vanessa de Arruda Souza, Débora Regina Roberti   +5 more
wiley   +1 more source

Global analysis for periodic variations in gravity wave squared amplitudes and momentum fluxes in the middle atmosphere [PDF]

Annales Geophysicae, 2019
Atmospheric gravity waves (GWs) are an important coupling mechanism in the middle atmosphere. For instance, they provide a large part of the driving of long-period atmospheric oscillations such as the Quasi-Biennial Oscillation (QBO) and the semiannual ...
D. Chen, D. Chen, C. Strube, M. Ern, P. Preusse, M. Riese   +5 more
doaj   +1 more source

Atmospheric Chemistry of CF3C(Cl)═CH2 (HCFO‐1233xf)

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT 2‐chloro‐3,3,3‐trifluoropropene, CF3C(Cl)═CH2 (HCFO‐1233xf), is a volatile hydrochlorofluoroolefin, commonly used in industrial synthesis of other halogenated olefins. Kinetics and reaction mechanisms for the reactions of OH radicals, Cl atoms, and O3 with CF3C(Cl)═CH2 were investigated using FTIR/smog chamber studies in 700 Torr of air/N2 ...
Bethanie Curiel, Connor Blair, Morten Frausig, Luisa Pennacchio, Thomas G. Minehan, Ole John Nielsen, Mads P. Sulbaek Andersen   +6 more
wiley   +1 more source

Seasonal winter forecasts and the stratosphere

, 2016
We investigate seasonal forecasts of the winter North Atlantic Oscillation (NAO) and their relationship with the stratosphere. Climatological frequencies of sudden stratospheric warming (SSW) and strong polar vortex (SPV) events are well represented and ...
Adam A. Scaife, A. Karpechko, M. Baldwin, A. Brookshaw, A. Butler, R. Eade, M. Gordon, C. MacLachlan, N. Martin, N. Dunstone, D. Smith   +10 more
semanticscholar   +1 more source

Reaction Rate Coefficients and Adduct Formation in the Cl Atom + (E)‐CF3CF2CH=CHCF2CF3 Reaction

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT In this work, rate coefficients for the Cl‐atom + (E)‐CF3CF2CH═CHCF2CF3 (HFO‐153‐10mczz, F22E) gas‐phase reaction were measured as a function of temperature and pressure, k(243–323 K, 50–300 Torr), using a pulsed laser photolysis‐resonance fluorescence (PLP‐RF) technique.
Maria‐Areti I. Spanoudaki, Daniel Van Hoomissen, Vassileios C. Papadimitriou, James B. Burkholder   +3 more
wiley   +1 more source

Tomographic reconstruction of atmospheric gravity wave parameters from airglow observations [PDF]

Atmospheric Measurement Techniques, 2017
Gravity waves (GWs) play an important role in the dynamics of the mesosphere and lower thermosphere (MLT). Therefore, global observations of GWs in the MLT region are of particular interest.
R. Song, R. Song, M. Kaufmann, J. Ungermann, M. Ern, G. Liu, M. Riese, M. Riese   +7 more
doaj   +1 more source

The benefits of a hybrid‐3DEnVar data assimilation scheme for the convection‐permitting NWP model AROME–Austria

Quarterly Journal of the Royal Meteorological Society, EarlyView.
The climatological‐error covariance matrix used in three‐dimensional variational data assimilation (3DVar) provides smooth and isotropic increments spread to long distances. In contrast, three‐dimensional ensemble variational data assimilation (3DEnVar) with a purely ensemble‐error covariance matrix provides inhomogeneous increments and contains the ...
Kaushambi Jyoti, Philipp Griewank, Florian Meier, Martin Weissmann   +3 more
wiley   +1 more source