Reconciling aerosol light extinction measurements from spaceborne lidar observations and in situ measurements in the Arctic
In this study we investigate to what degree it is possible to reconcile continuously recorded particle light extinction coefficients derived from dry in situ measurements at Zeppelin station (78.92° N, 11.85° E; 475 m above sea level), Ny-Ålesund, Svalbard, that are recalculated to ambient relative...
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ftdoajarticles:oai:doaj.org/article:6de6f3f577374989b0c4161d81fa9838 2023-05-15T15:17:04+02:00 Reconciling aerosol light extinction measurements from spaceborne lidar observations and in situ measurements in the Arctic M. Tesche P. Zieger N. Rastak R. J. Charlson P. Glantz P. Tunved H.-C. Hansson 2014-08-01T00:00:00Z https://doi.org/10.5194/acp-14-7869-2014 https://doaj.org/article/6de6f3f577374989b0c4161d81fa9838 EN eng Copernicus Publications http://www.atmos-chem-phys.net/14/7869/2014/acp-14-7869-2014.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-14-7869-2014 https://doaj.org/article/6de6f3f577374989b0c4161d81fa9838 Atmospheric Chemistry and Physics, Vol 14, Iss 15, Pp 7869-7882 (2014) Physics QC1-999 Chemistry QD1-999 article 2014 ftdoajarticles https://doi.org/10.5194/acp-14-7869-2014 2022-12-31T04:40:34Z In this study we investigate to what degree it is possible to reconcile continuously recorded particle light extinction coefficients derived from dry in situ measurements at Zeppelin station (78.92° N, 11.85° E; 475 m above sea level), Ny-Ålesund, Svalbard, that are recalculated to ambient relative humidity, as well as simultaneous ambient observations with the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite. To our knowledge, this represents the first study that compares spaceborne lidar measurements to optical aerosol properties from short-term in situ observations (averaged over 5 h) on a case-by-case basis. Finding suitable comparison cases requires an elaborate screening and matching of the CALIOP data with respect to the location of Zeppelin station as well as the selection of temporal and spatial averaging intervals for both the ground-based and spaceborne observations. Reliable reconciliation of these data cannot be achieved with the closest-approach method, which is often used in matching CALIOP observations to those taken at ground sites. This is due to the transport pathways of the air parcels that were sampled. The use of trajectories allowed us to establish a connection between spaceborne and ground-based observations for 57 individual overpasses out of a total of 2018 that occurred in our region of interest around Svalbard (0 to 25° E, 75 to 82° N) in the considered year of 2008. Matches could only be established during winter and spring, since the low aerosol load during summer in connection with the strong solar background and the high occurrence rate of clouds strongly influences the performance and reliability of CALIOP observations. Extinction coefficients in the range of 2 to 130 Mm −1 at 532 nm were found for successful matches with a difference of a factor of 1.47 (median value for a range from 0.26 to 11.2) between the findings of in situ and spaceborne observations (the latter being ... Article in Journal/Newspaper Arctic Ny Ålesund Ny-Ålesund Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Ny-Ålesund Atmospheric Chemistry and Physics 14 15 7869 7882 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 M. Tesche P. Zieger N. Rastak R. J. Charlson P. Glantz P. Tunved H.-C. Hansson Reconciling aerosol light extinction measurements from spaceborne lidar observations and in situ measurements in the Arctic |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
In this study we investigate to what degree it is possible to reconcile continuously recorded particle light extinction coefficients derived from dry in situ measurements at Zeppelin station (78.92° N, 11.85° E; 475 m above sea level), Ny-Ålesund, Svalbard, that are recalculated to ambient relative humidity, as well as simultaneous ambient observations with the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite. To our knowledge, this represents the first study that compares spaceborne lidar measurements to optical aerosol properties from short-term in situ observations (averaged over 5 h) on a case-by-case basis. Finding suitable comparison cases requires an elaborate screening and matching of the CALIOP data with respect to the location of Zeppelin station as well as the selection of temporal and spatial averaging intervals for both the ground-based and spaceborne observations. Reliable reconciliation of these data cannot be achieved with the closest-approach method, which is often used in matching CALIOP observations to those taken at ground sites. This is due to the transport pathways of the air parcels that were sampled. The use of trajectories allowed us to establish a connection between spaceborne and ground-based observations for 57 individual overpasses out of a total of 2018 that occurred in our region of interest around Svalbard (0 to 25° E, 75 to 82° N) in the considered year of 2008. Matches could only be established during winter and spring, since the low aerosol load during summer in connection with the strong solar background and the high occurrence rate of clouds strongly influences the performance and reliability of CALIOP observations. Extinction coefficients in the range of 2 to 130 Mm −1 at 532 nm were found for successful matches with a difference of a factor of 1.47 (median value for a range from 0.26 to 11.2) between the findings of in situ and spaceborne observations (the latter being ... |
format |
Article in Journal/Newspaper |
author |
M. Tesche P. Zieger N. Rastak R. J. Charlson P. Glantz P. Tunved H.-C. Hansson |
author_facet |
M. Tesche P. Zieger N. Rastak R. J. Charlson P. Glantz P. Tunved H.-C. Hansson |
author_sort |
M. Tesche |
title |
Reconciling aerosol light extinction measurements from spaceborne lidar observations and in situ measurements in the Arctic |
title_short |
Reconciling aerosol light extinction measurements from spaceborne lidar observations and in situ measurements in the Arctic |
title_full |
Reconciling aerosol light extinction measurements from spaceborne lidar observations and in situ measurements in the Arctic |
title_fullStr |
Reconciling aerosol light extinction measurements from spaceborne lidar observations and in situ measurements in the Arctic |
title_full_unstemmed |
Reconciling aerosol light extinction measurements from spaceborne lidar observations and in situ measurements in the Arctic |
title_sort |
reconciling aerosol light extinction measurements from spaceborne lidar observations and in situ measurements in the arctic |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/acp-14-7869-2014 https://doaj.org/article/6de6f3f577374989b0c4161d81fa9838 |
geographic |
Arctic Svalbard Ny-Ålesund |
geographic_facet |
Arctic Svalbard Ny-Ålesund |
genre |
Arctic Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Arctic Ny Ålesund Ny-Ålesund Svalbard |
op_source |
Atmospheric Chemistry and Physics, Vol 14, Iss 15, Pp 7869-7882 (2014) |
op_relation |
http://www.atmos-chem-phys.net/14/7869/2014/acp-14-7869-2014.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-14-7869-2014 https://doaj.org/article/6de6f3f577374989b0c4161d81fa9838 |
op_doi |
https://doi.org/10.5194/acp-14-7869-2014 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
14 |
container_issue |
15 |
container_start_page |
7869 |
op_container_end_page |
7882 |
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1766347343587704832 |