Results 21 to 30 of about 70,688 (219)

An optimization-based approach to track the Asian summer monsoon anticyclone across daily and interannual variability [PDF]

Atmospheric Chemistry and Physics
The definition of the boundary of the Asian summer monsoon anticyclone (ASMA) in the upper troposphere-lower stratosphere (UTLS) (350–410 K) is a known challenge that highly impacts the information about the anticyclone's behavior and affects the results
O. Kachula, B. Vogel, G. Günther, R. Müller   +3 more
doaj   +1 more source

Measurement report: Comprehensive seasonal study of the composition and sources of submicron aerosol during the JULIAC campaign in Germany [PDF]

Atmospheric Chemistry and Physics
The seasonal variations of aerosol sources and their atmospheric evolution are investigated using observations from the year-long JULIAC (Jülich Atmospheric Chemistry Project) campaign (January–November 2019) in Jülich, Germany.
L. Liu, L. Liu, T. Hohaus, A. Hofzumahaus, F. Holland, H. Fuchs, H. Fuchs, R. Tillmann, B. Bohn, S. Andres, Z. Tan, Z. Tan, F. Rohrer, V. A. Karydis, V. Vardhan, V. Vardhan, P. Franke, A. C. Lange, A. Novelli, B. Winter, C. Cho, C. Cho, I. Gensch, S. Wedel, A. Wahner, A. Kiendler-Scharr   +25 more
doaj   +1 more source

Temperature-dependent rate coefficients for the reactions of OH radicals with selected alkanes, aromatic compounds, and monoterpenes [PDF]

Atmospheric Chemistry and Physics
The rate coefficients of the reaction of hydroxyl radicals (OH) with 12 different volatile organic compounds (VOCs), namely methane, ethane, propane, n-butane, methyl vinyl ketone (MVK), γ-terpinene, Δ3-carene, myrcene, toluene, o-xylene, m-xylene, and ...
F. Berg, A. Novelli, R. Dubus, A. Hofzumahaus, F. Holland, A. Wahner, H. Fuchs, H. Fuchs   +7 more
doaj   +1 more source

The lapse rate and the cold point tropopause in the Asian Summer Monsoon anticyclone [PDF]

Atmospheric Chemistry and Physics
Tropospheric and stratospheric airmasses are separated by the tropopause. Here we investigate the lapse rate tropopause and the cold point tropopause in the Asian summer monsoon anticyclone (ASMA) based on high-altitude airborne measurements in summer ...
R. Müller, B. Vogel, M. Krämer, C. Rolf, N. Spelten, F. Ravegnani   +5 more
doaj   +1 more source

The potential of drone observations to improve air quality predictions by 4D-Var [PDF]

Atmospheric Chemistry and Physics
Vertical profiles of atmospheric pollutants, acquired by uncrewed aerial vehicles (UAVs, known as drones), represent a new type of observation that can help to fill the existing observation gap in the planetary boundary layer (PBL). This article presents
H. Erraji, P. Franke, A. Lampert, T. Schuldt, R. Tillmann, A. Wahner, A. C. Lange   +6 more
doaj   +1 more source

A novel conceptual model for Dansgaard–Oeschger event dynamics based on ice-core data [PDF]

Climate of the Past
This study introduces a novel dynamical systems model designed to capture the highly non-periodic nature of Dansgaard–Oeschger (DO) events. Such events are difficult to model adequately due to their variable durations (some lasting around 1 century ...
J. O. Melcher, S. Halkjær, P. Ditlevsen, P. L. Langen, G. Vettoretti, S. O. Rasmussen   +5 more
doaj   +1 more source

Global perspectives on nitrate aerosol dynamics: a comprehensive sensitivity analysis [PDF]

Atmospheric Chemistry and Physics
In recent years, nitrate aerosols have become a dominant component of atmospheric composition, surpassing sulfate in both concentration and climatic impact. However, accurately simulating nitrate remains a major challenge for global models due to complex
A. Milousis, S. M. C. Scholz, H. Fuchs, H. Fuchs, A. P. Tsimpidi, V. A. Karydis   +5 more
doaj   +1 more source

Kinetics of the reactions of OH with CO, NO, and NO₂ and of HO₂ with NO₂ in air at 1 atm pressure, room temperature, and tropospheric water vapour concentrations [PDF]

Atmospheric Chemistry and Physics
The termolecular reactions of hydroxyl radicals (OH) with carbon monoxide (CO), nitric oxide (NO), and nitrogen dioxides (NO2) and the termolecular reaction of hydroperoxy radicals (HO2) with NO2 greatly impact the atmospheric oxidation efficiency.
M. Rolletter, A. Hofzumahaus, A. Novelli, A. Wahner, H. Fuchs, H. Fuchs   +5 more
doaj   +1 more source

Identifying orographic gravity waves in 3D observations via backward ray tracing [PDF]

Atmospheric Chemistry and Physics
Atmospheric gravity waves (GWs) generated by orography, commonly referred to as mountain waves (MWs), play a key role in driving atmospheric circulation and in modulating phenomena such as sudden stratospheric warmings (SSWs). Their contribution, however,
S. Rhode, P. Preusse, J. Ungermann
doaj   +1 more source

On the occurrence of annual layers in Dome Fuji ice core early Holocene ice [PDF]

Climate of the Past, 2015
Whereas ice cores from high-accumulation sites in coastal Antarctica clearly demonstrate annual layering, it is debated whether a seasonal signal is also preserved in ice cores from lower-accumulation sites further inland and particularly on the East ...
A. Svensson, S. Fujita, M. Bigler, M. Braun, R. Dallmayr, V. Gkinis, K. Goto-Azuma, M. Hirabayashi, K. Kawamura, S. Kipfstuhl, H. A. Kjær, T. Popp, M. Simonsen, J. P. Steffensen, P. Vallelonga, B. M. Vinther   +15 more
doaj   +1 more source