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Robertson, Lennart
Publications (10 of 50) Show all publications
Colette, A., Collin, G., Besson, F., Blot, E., Guidard, V., Meleux, F., . . . Rouil, L. (2025). Copernicus Atmosphere Monitoring Service - Regional Air Quality Production System v1.0. Geoscientific Model Development, 18(19), 6835-6883
Open this publication in new window or tab >>Copernicus Atmosphere Monitoring Service - Regional Air Quality Production System v1.0
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2025 (English)In: Geoscientific Model Development, ISSN 1991-959X, E-ISSN 1991-9603, Vol. 18, no 19, p. 6835-6883Article in journal (Refereed) Published
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
urn:nbn:se:smhi:diva-6814 (URN)10.5194/gmd-18-6835-2025 (DOI)001587767100001 ()
Available from: 2025-10-21 Created: 2025-10-21 Last updated: 2025-10-21Bibliographically approved
Guevara, M., Colette, A., Guion, A., Petiot, V., Adani, M., Arteta, J., . . . Ye, Z. (2025). Technical note: sensitivity of the CAMS regional air quality modelling system to anthropogenic emission temporal variability. Atmospheric Chemistry And Physics, 25(20), 13245-13278
Open this publication in new window or tab >>Technical note: sensitivity of the CAMS regional air quality modelling system to anthropogenic emission temporal variability
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2025 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 25, no 20, p. 13245-13278Article in journal (Refereed) Published
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
urn:nbn:se:smhi:diva-6819 (URN)10.5194/acp-25-13245-2025 (DOI)001597728300001 ()
Available from: 2025-10-28 Created: 2025-10-28 Last updated: 2025-10-28Bibliographically approved
De Geer, L.-E., Wright, C. M. & Robertson, L. (2024). Establishing the case for a May 2010 low-yield, unannounced nuclear test in North Korea. Journal of Radioanalytical and Nuclear Chemistry
Open this publication in new window or tab >>Establishing the case for a May 2010 low-yield, unannounced nuclear test in North Korea
2024 (English)In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780Article in journal (Refereed) Published
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
urn:nbn:se:smhi:diva-6620 (URN)10.1007/s10967-024-09453-2 (DOI)001230134000005 ()
Available from: 2024-06-04 Created: 2024-06-04 Last updated: 2025-06-12Bibliographically approved
Plu, M., Scherllin-Pirscher, B., Arnold Arias, D., Baro, R., Bigeard, G., Bugliaro, L., . . . Zopp, R. (2021). An ensemble of state-of-the-art ash dispersion models: towards probabilistic forecasts to increase the resilience of air traffic against volcanic eruptions. Natural hazards and earth system sciences, 21(10), 2973-2992
Open this publication in new window or tab >>An ensemble of state-of-the-art ash dispersion models: towards probabilistic forecasts to increase the resilience of air traffic against volcanic eruptions
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2021 (English)In: Natural hazards and earth system sciences, ISSN 1561-8633, E-ISSN 1684-9981, Vol. 21, no 10, p. 2973-2992Article in journal (Refereed) Published
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
urn:nbn:se:smhi:diva-6178 (URN)10.5194/nhess-21-2973-2021 (DOI)000706528100001 ()
Available from: 2021-10-26 Created: 2021-10-26 Last updated: 2025-06-12Bibliographically approved
Barre, J., Petetin, H., Colette, A., Guevara, M., Peuch, V.-H., Rouil, L., . . . Kouznetsov, R. (2021). Estimating lockdown-induced European NO2 changes using satellite and surface observations and air quality models. Atmospheric Chemistry And Physics, 21(9), 7373-7394
Open this publication in new window or tab >>Estimating lockdown-induced European NO2 changes using satellite and surface observations and air quality models
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2021 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 21, no 9, p. 7373-7394Article in journal (Refereed) Published
Abstract [en]

This study provides a comprehensive assessment of NO2 changes across the main European urban areas induced by COVID-19 lockdowns using satellite retrievals from the Tropospheric Monitoring Instrument (TROPOMI) onboard the Sentinel-5p satellite, surface site measurements, and simulations from the Copernicus Atmosphere Monitoring Service (CAMS) regional ensemble of air quality models. Some recent TROPOMI-based estimates of changes in atmospheric NO2 concentrations have neglected the influence of weather variability between the reference and lockdown periods. Here we provide weather-normalized estimates based on a machine learning method (gradient boosting) along with an assessment of the biases that can be expected from methods that omit the influence of weather. We also compare the weather-normalized satellite-estimated NO2 column changes with weather-normalized surface NO2 concentration changes and the CAMS regional ensemble, composed of 11 models, using recently published estimates of emission reductions induced by the lockdown. All estimates show similar NO2 reductions. Locations where the lockdown measures were stricter show stronger reductions, and, conversely, locations where softer measures were implemented show milder reductions in NO2 pollution levels. Average reduction estimates based on either satellite observations (-23 %), surface stations (-43 %), or models (-32 %) are presented, showing the importance of vertical sampling but also the horizontal representativeness. Surface station estimates are significantly changed when sampled to the TROPOMI overpasses (-37 %), pointing out the importance of the variability in time of such estimates. Observation-based machine learning estimates show a stronger temporal variability than model-based estimates.
National Category
Meteorology and Atmospheric Sciences
Research subject
Environment
Identifiers
urn:nbn:se:smhi:diva-6119 (URN)10.5194/acp-21-7373-2021 (DOI)000653523100002 ()
Available from: 2021-06-16 Created: 2021-06-16 Last updated: 2025-06-12Bibliographically approved
Brenot, H., Theys, N., Clarisse, L., van Gent, J., Hurtmans, D. R., Vandenbussche, S., . . . Wotawa, G. (2021). EUNADICS-AV early warning system dedicated to supporting aviation in the case of a crisis from natural airborne hazards and radionuclide clouds. Natural hazards and earth system sciences, 21(11), 3367-3405
Open this publication in new window or tab >>EUNADICS-AV early warning system dedicated to supporting aviation in the case of a crisis from natural airborne hazards and radionuclide clouds
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2021 (English)In: Natural hazards and earth system sciences, ISSN 1561-8633, E-ISSN 1684-9981, Vol. 21, no 11, p. 3367-3405Article in journal (Refereed) Published
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
urn:nbn:se:smhi:diva-6193 (URN)10.5194/nhess-21-3367-2021 (DOI)000716716200001 ()
Available from: 2021-11-23 Created: 2021-11-23 Last updated: 2025-06-12Bibliographically approved
Hirtl, M., Arnold, D., Baro, R., Brenot, H., Coltelli, M., Eschbacher, K., . . . Zopp, R. (2020). A volcanic-hazard demonstration exercise to assess and mitigate the impacts of volcanic ash clouds on civil and military aviation. Natural hazards and earth system sciences, 20(6), 1719-1739
Open this publication in new window or tab >>A volcanic-hazard demonstration exercise to assess and mitigate the impacts of volcanic ash clouds on civil and military aviation
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2020 (English)In: Natural hazards and earth system sciences, ISSN 1561-8633, E-ISSN 1684-9981, Vol. 20, no 6, p. 1719-1739Article in journal (Refereed) Published
National Category
Environmental Sciences
Research subject
Environment
Identifiers
urn:nbn:se:smhi:diva-5764 (URN)10.5194/nhess-20-1719-2020 (DOI)000541724700001 ()
Available from: 2020-08-17 Created: 2020-08-17 Last updated: 2025-06-12Bibliographically approved
Sofiev, M., Ritenberga, O., Albertini, R., Arteta, J., Belmonte, J., Bernstein, C. G., . . . Vokou, D. (2017). Multi-model ensemble simulations of olive pollen distribution in Europe in 2014: current status and outlook. Atmospheric Chemistry And Physics, 17(20), 12341-12360
Open this publication in new window or tab >>Multi-model ensemble simulations of olive pollen distribution in Europe in 2014: current status and outlook
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2017 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 17, no 20, p. 12341-12360Article in journal (Refereed) Published
National Category
Environmental Sciences
Research subject
Environment
Identifiers
urn:nbn:se:smhi:diva-4306 (URN)10.5194/acp-17-12341-2017 (DOI)000413112300002 ()
Available from: 2017-11-13 Created: 2017-11-13 Last updated: 2025-06-12Bibliographically approved
Andersson, C., Alpfjord, H., Robertson, L., Karlsson, P. E. & Engardt, M. (2017). Reanalysis of and attribution to near-surface ozone concentrations in Sweden during 1990-2013. Atmospheric Chemistry And Physics, 17(22)
Open this publication in new window or tab >>Reanalysis of and attribution to near-surface ozone concentrations in Sweden during 1990-2013
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2017 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 17, no 22Article in journal (Refereed) Published
National Category
Earth and Related Environmental Sciences
Research subject
Environment
Identifiers
urn:nbn:se:smhi:diva-4452 (URN)10.5194/acp-17-13869-2017 (DOI)000416001700001 ()
Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2025-06-12Bibliographically approved
Thomas, M., Brannstrom, N., Persson, C., Grahn, H., von Schoenberg, P. & Robertson, L. (2017). Surface air quality implications of volcanic injection heights. Atmospheric Environment, 166, 510-518
Open this publication in new window or tab >>Surface air quality implications of volcanic injection heights
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2017 (English)In: Atmospheric Environment, ISSN 1352-2310, E-ISSN 1873-2844, Vol. 166, p. 510-518Article in journal (Refereed) Published
National Category
Environmental Sciences
Research subject
Environment
Identifiers
urn:nbn:se:smhi:diva-4316 (URN)10.1016/j.atmosenv.2017.07.045 (DOI)000411298800046 ()
Available from: 2017-11-13 Created: 2017-11-13 Last updated: 2025-06-12Bibliographically approved
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