Results 41 to 50 of about 11,807 (143)

Estimation of Atmospheric Path Delays in TerraSAR-X Data using Models vs. Measurements

Sensors, 2008
Spaceborne synthetic aperture radar (SAR) measurements of the Earth’s surface depend on electromagnetic waves that are subject to atmospheric path delays, in turn affecting geolocation accuracy.
Donat Perler, Michael Jehle, David Small, Adrian Schubert, Erich Meier   +4 more
doaj   +1 more source

GNSS ionospheric TEC and positioning accuracy during intense space and terrestrial weather events in B&H [PDF]

Geodetski Vestnik, 2019
To achieve the high accuracy in GNSS positioning, the various atmospheric effects on GNSS signals need to be mitigated, where the major part present the ionised atmosphere (ionosphere) and the neutral atmosphere (troposphere).
Randa Natraš, Dževad Krdžalić, Džana Horozović, Alma Tabaković, Medžida Mulić   +4 more
doaj   +1 more source

Tropospheric Ozone at Northern Mid-Latitudes: Modeled and Measured Long-Term Changes

Atmosphere, 2017
In this paper, we investigate why current state-of-the-art chemistry-climate models underestimate the tropospheric ozone increase from the 1950s to the 1990s by approximately 50%.
Johannes Staehelin, Fiona Tummon, Laura Revell, Andrea Stenke, Thomas Peter   +4 more
doaj   +1 more source

CARIBIC observations of gaseous mercury in the upper troposphere and lower stratosphere

E3S Web of Conferences, 2013
A unique set of gaseous mercury measurements in the upper troposphere and lower stratosphere (UT/LS) has been obtained during the monthly CARIBIC (www.caribic-atmospheric.com) flights since May 2005.
Slemr F., Ebinghaus R., Weigelt A., Kock H. H., Brenninkmeijer C. A. M., Schuck T., Hermann M., Zahn A., Velthoven P. van, Martinsson B., Ziereis H.   +10 more
doaj   +1 more source

Tropospheric amplification of stratosphere–troposphere coupling

Quarterly Journal of the Royal Meteorological Society
Abstract During northern winter the stratospheric polar vortex is highly variable — even breaking down completely during sudden stratospheric warmings. The strength of the stratospheric polar vortex is observed to be coupled to surface weather, primarily through swings in the phase of the Northern Annular Mode — which is nearly ...
Mark P. Baldwin, Thomas Birner, Blanca Ayarzagüena   +2 more
openaire   +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

Retrieval and Analysis of the Strongest Mixed Layer in the Troposphere

Atmosphere, 2020
In this article, Thorpe analysis, which often retrieves the characteristics of mixing in the free atmosphere from balloon sounding data, is applied to the data of the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC).
Zheng Sheng, Lesong Zhou, Yang He
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

tropospheric oxalate

Geophysical Research Letters, 1983
The existence of oxalate (COO)2= in tropospheric aerosols and in precipitation has been demonstrated using ion chromatography. Mixing ratios have been observed up to 50 pptv in air samples and 0.3 ppm in precipitation. Correlation of airborne oxalate with airborne nitrate suggests a pollution source.
R. B. Norton, J. M. Roberts, B. J. Huebert   +2 more
openaire   +1 more source

Ray Tracing and Applications to an Evaporation Duct Model Based on Data from Oceanographic Buoy Sensors

Journal of Microwaves, Optoelectronics and Electromagnetic Applications
The two-dimensional ray tracing method allows an easy and fast modeling of tropospheric propagation in the microwave frequency range. A version of this method that determines ray trajectories, amplitudes and delays of the electromagnetic field, as well ...
Leonardo L. Freitas, Emanoel Costa
doaj   +1 more source