Zobrazeno 1 - 10
of 244
pro vyhledávání: '"N. Theys"'
Autor:
J.-P. Vernier, T. J. Aubry, C. Timmreck, A. Schmidt, L. Clarisse, F. Prata, N. Theys, A. T. Prata, G. Mann, H. Choi, S. Carn, R. Rigby, S. C. Loughlin, J. A. Stevenson
Publikováno v:
Atmospheric Chemistry and Physics, Vol 24, Pp 5765-5782 (2024)
The 21 June 2019 Raikoke eruption (48° N, 153° E) generated one of the largest amounts of sulfur emission to the stratosphere since the 1991 Mt. Pinatubo eruption. Satellite measurements indicate a consensus best estimate of 1.
Externí odkaz:
https://doaj.org/article/3cb279089a14467495b713f6fb150ed9
Publikováno v:
Atmospheric Chemistry and Physics, Vol 24, Pp 4973-5007 (2024)
Nitrous acid (HONO) is a key atmospheric component, acting as a major source of the hydroxyl radical (OH), the primary oxidant in the Earth's atmosphere. However, understanding its spatial and temporal variability remains a significant challenge. Rec
Externí odkaz:
https://doaj.org/article/28e183ce8d434253b9760025171cc255
Autor:
V. E. Fioletov, C. A. McLinden, D. Griffin, N. A. Krotkov, C. Li, J. Joiner, N. Theys, S. Carn
Publikováno v:
Atmospheric Measurement Techniques, Vol 16, Pp 5575-5592 (2023)
Early versions of satellite nadir-viewing UV SO2 data products did not explicitly account for the effects of snow/ice on retrievals. Snow-covered terrain, with its high reflectance in the UV, typically enhances satellite sensitivity to boundary layer
Externí odkaz:
https://doaj.org/article/59add8535534473da7023af6784eb5a5
Publikováno v:
Atmospheric Measurement Techniques, Vol 16, Pp 1609-1662 (2023)
We investigate effects of the three-dimensional (3D) structure of volcanic plumes on the retrieval results of satellite and ground-based UV–Vis observations. For the analysis of such measurements, 1D scenarios are usually assumed (the atmospheric p
Externí odkaz:
https://doaj.org/article/2a620830c40f47778ce1f15290a896e5
Autor:
S. Martínez‐Alonso, J. P. Veefkind, B. Dix, B. Gaubert, N. Theys, C. Granier, A. Soulié, S. Darras, H. Eskes, W. Tang, H. Worden, J. deGouw, P. F. Levelt
Publikováno v:
Geophysical Research Letters, Vol 50, Iss 19, Pp n/a-n/a (2023)
Abstract We have analyzed Sentinel‐5 Precursor TROPOspheric Monitoring Instrument (TROPOMI) data over the Copperbelt mining region (Democratic Republic of Congo and Zambia). Despite high background values, annual 2019–2022 means of TROPOMI NO2 (n
Externí odkaz:
https://doaj.org/article/9963ab8d863f4152a2505278479a96e9
Publikováno v:
Geophysical Research Letters, Vol 50, Iss 17, Pp n/a-n/a (2023)
Abstract Wildfires are important sources of atmospheric reactive nitrogen. The reactive nitrogen species partitioning generally depends on fire characteristics. One reactive nitrogen compound, nitrous acid (HONO), is a source of hydroxyl radicals and
Externí odkaz:
https://doaj.org/article/12c00797f6c74007b11c772371c143f3
Autor:
V. E. Fioletov, C. A. McLinden, D. Griffin, I. Abboud, N. Krotkov, P. J. T. Leonard, C. Li, J. Joiner, N. Theys, S. Carn
Publikováno v:
Earth System Science Data, Vol 15, Pp 75-93 (2023)
Sulfur dioxide (SO2) measurements from the Ozone Monitoring Instrument (OMI), Ozone Mapping and Profiler Suite (OMPS), and TROPOspheric Monitoring Instrument (TROPOMI) satellite spectrometers were used to update and extend the previously developed gl
Externí odkaz:
https://doaj.org/article/c4e198ad7a5140728efb2a3e87ced82d
Autor:
M. Latsch, A. Richter, H. Eskes, M. Sneep, P. Wang, P. Veefkind, R. Lutz, D. Loyola, A. Argyrouli, P. Valks, T. Wagner, H. Sihler, M. van Roozendael, N. Theys, H. Yu, R. Siddans, J. P. Burrows
Publikováno v:
Atmospheric Measurement Techniques, Vol 15, Pp 6257-6283 (2022)
Clouds have a strong impact on satellite measurements of tropospheric trace gases in the ultraviolet, visible, and near-infrared spectral ranges from space. Therefore, trace gas retrievals rely on information on cloud fraction, cloud albedo, and clou
Externí odkaz:
https://doaj.org/article/d5b8c0c116a142548040937d5913c941
Autor:
N. Theys, C. Lerot, H. Brenot, J. van Gent, I. De Smedt, L. Clarisse, M. Burton, M. Varnam, C. Hayer, B. Esse, M. Van Roozendael
Publikováno v:
Atmospheric Measurement Techniques, Vol 15, Pp 4801-4817 (2022)
Knowledge of sulfur dioxide layer height (SO2 LH) is important to understand volcanic eruption processes, the climate impact of SO2 emissions and to mitigate volcanic risk for civil aviation. However, the estimation of SO2 LH from ground-based instru
Externí odkaz:
https://doaj.org/article/3beaac3bce7148dbb77047886466dc46
Autor:
P. F. Levelt, D. C. Stein Zweers, I. Aben, M. Bauwens, T. Borsdorff, I. De Smedt, H. J. Eskes, C. Lerot, D. G. Loyola, F. Romahn, T. Stavrakou, N. Theys, M. Van Roozendael, J. P. Veefkind, T. Verhoelst
Publikováno v:
Atmospheric Chemistry and Physics, Vol 22, Pp 10319-10351 (2022)
The aim of this paper is to highlight how TROPOspheric Monitoring Instrument (TROPOMI) trace gas data can best be used and interpreted to understand event-based impacts on air quality from regional to city scales around the globe. For this study, we
Externí odkaz:
https://doaj.org/article/333b8d03fbe6489485491cc6b7a0ecb9