Results 11 to 20 of about 753 (136)

Beyond the Training Data: Confidence‐Guided Mixing of Parameterizations in a Hybrid AI‐Climate Model

Journal of Advances in Modeling Earth Systems
Persistent systematic errors in Earth system models (ESMs) arise from difficulties in representing the full diversity of subgrid, multiscale atmospheric convection and turbulence.
Helge Heuer, Tom Beucler, Mierk Schwabe, Julien Savre, Manuel Schlund, Veronika Eyring   +5 more
doaj   +2 more sources

Aerosol - Cloud Target Classification in HALO Lidar/Radar Collocated Measurements [PDF]

EPJ Web of Conferences, 2020
Particle attenuated backscatter and depolarization ratio at 532 nm from the WALES (Water Vapor Lidar Experiment in Space) instrument are used in combination with the radar reflectivity from the 35 GHz MIRA35 cloud radar in order to perform an aerosol ...
Marinou Eleni, Ewald Florian, Gross Silke, Wirth Martin, Schaefler Andreas, Cazenave Quitterie, Delanoë Julien   +6 more
doaj   +1 more source

Dynamics and composition of the Asian summer monsoon anticyclone [PDF]

Atmospheric Chemistry and Physics, 2018
This study places HALO research aircraft observations in the upper-tropospheric Asian summer monsoon anticyclone (ASMA) into the context of regional, intra-annual variability by hindcasts with the ECHAM/MESSy Atmospheric Chemistry (EMAC) model.
K.-D. Gottschaldt, H. Schlager, R. Baumann, D. S. Cai, V. Eyring, P. Graf, V. Grewe, V. Grewe, P. Jöckel, T. Jurkat-Witschas, C. Voigt, C. Voigt, A. Zahn, H. Ziereis   +13 more
doaj   +1 more source

Chlorine partitioning in the lowermost Arctic vortex during the cold winter 2015/2016 [PDF]

Atmospheric Chemistry and Physics, 2019
Activated chlorine compounds in the polar winter stratosphere drive catalytic cycles that deplete ozone and methane, whose abundances are highly relevant to the evolution of global climate.
A. Marsing, A. Marsing, T. Jurkat-Witschas, J.-U. Grooß, S. Kaufmann, R. Heller, A. Engel, P. Hoor, J. Krause, J. Krause, C. Voigt, C. Voigt   +11 more
doaj   +1 more source

A combined observational and modelling approach to evaluate aerosol–cirrus interactions at high and mid-latitudes [PDF]

Atmospheric Chemistry and Physics
Aerosol–cirrus interactions remain a major source of uncertainty in climate models due to the complex interplay of aerosol properties, ice nucleation pathways, and atmospheric conditions.
E. De La Torre Castro, C. G. Beer, T. Jurkat-Witschas, D. Sauer, M. Righi, J. Hendricks, C. Voigt, C. Voigt   +7 more
doaj   +1 more source

Airborne Lidar Measurements of Anthropogenic Methane Sources with CHARM-F during the CoMet 2.0 Arctic Campaign [PDF]

EPJ Web of Conferences
The airborne Integrated Path Differential Absorption Lidar CHARM-F for accurate column concentration measurements of CH4 and CO2 has been very successfully deployed on a HALO aircraft campaign over Canada in late summer 2022. The scientific target areas,
Fruck Christian, Quatrevalet Mathieu, Wolff Sebastian, Wirth Martin, Kiemle Christoph, Ehret Gerhard, Fix Andreas   +6 more
doaj   +1 more source

Validation of the MERLIN Data Products by the Airborne Demonstrator CHARM-F [PDF]

EPJ Web of Conferences
Validation of the MERLIN data products by the airborne demonstrator CHARM-F is regarded a key mission element. Deployment of this instrument on the German HALO or French ATR aircrafts during several scientific campaigns enabled to improve the measurement
Zechlau Sabrina, Ehret Gerhard, Fix Andreas, Fruck Christian, Quatrevalet Mathieu, Wirth Martin, Wolff Sebastian   +6 more
doaj   +1 more source

Wintertime Saharan dust transport towards the Caribbean: an airborne lidar case study during EUREC⁴A [PDF]

Atmospheric Chemistry and Physics, 2022
Wintertime Saharan dust plumes in the vicinity of Barbados are investigated by means of airborne lidar measurements. The measurements were conducted in the framework of the EUREC4A (Elucidating the Role of Cloud-Circulation Coupling in Climate) field ...
M. Gutleben, M. Gutleben, S. Groß, C. Heske, M. Wirth   +4 more
doaj   +1 more source

Slow feedbacks resulting from strongly enhanced atmospheric methane mixing ratios in a chemistry–climate model with mixed-layer ocean [PDF]

Atmospheric Chemistry and Physics, 2021
In a previous study the quasi-instantaneous chemical impacts (rapid adjustments) of strongly enhanced methane (CH4) mixing ratios have been analysed. However, to quantify the influence of the respective slow climate feedbacks on the chemical composition ...
L. Stecher, F. Winterstein, M. Dameris, P. Jöckel, M. Ponater, M. Kunze   +5 more
doaj   +1 more source

“Cloud slicing” retrievals of the methane concentration in the planetary boundary layer from CHARM-F XCH4 measurements over the Northern Scandinavian wetlands [PDF]

EPJ Web of Conferences
Airborne or spaceborne Integral Path Differential Absorption (IPDA) lidar has the potential to deliver the highly accurate column measurements of trace gases that are needed to reduce the uncertainties on the surface fluxes of anthropogenic greenhouse ...
Quatrevalet Mathieu, Fix Andreas, Wirth Martin, Bodenbach Tanja, Rossi Philipp   +4 more
doaj   +1 more source