Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs
We compared star-photometry-derived, polar winter aerosol optical depths (AODs), acquired at Eureka, Nunavut, Canada, and Ny-Ålesund, Svalbard, with GEOSChem (GC) simulations as well as ground-based lidar and CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) retrievals over a sampling period...
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COPERNICUS GESELLSCHAFT MBH
2016
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Online Access: | https://epic.awi.de/id/eprint/46151/ https://epic.awi.de/id/eprint/46151/1/acp-16-12753-2016.pdf https://www.atmos-chem-phys.net/16/12753/2016/acp-16-12753-2016.pdf https://hdl.handle.net/10013/epic.776d113d-c2a3-4cb5-93e6-281bdb47edb7 |
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ftawi:oai:epic.awi.de:46151 2024-09-15T18:05:14+00:00 Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs O'Neill, Norman T. Baibakov, Konstantin Hesaraki, Sareh Ivanescu, Liviu Martin, Randall V. Perro, Chris Chaubey, Jai P. Herber, Andreas Duck, Thomas J. 2016-10-13 application/pdf https://epic.awi.de/id/eprint/46151/ https://epic.awi.de/id/eprint/46151/1/acp-16-12753-2016.pdf https://www.atmos-chem-phys.net/16/12753/2016/acp-16-12753-2016.pdf https://hdl.handle.net/10013/epic.776d113d-c2a3-4cb5-93e6-281bdb47edb7 unknown COPERNICUS GESELLSCHAFT MBH https://epic.awi.de/id/eprint/46151/1/acp-16-12753-2016.pdf O'Neill, N. T. , Baibakov, K. , Hesaraki, S. , Ivanescu, L. , Martin, R. V. , Perro, C. , Chaubey, J. P. , Herber, A. orcid:0000-0001-6651-3835 and Duck, T. J. (2016) Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs , Atmospheric Chemistry and Physics, 16 , pp. 12753-12765 . doi:10.5194/acp-16-12753-2016 <https://doi.org/10.5194/acp-16-12753-2016> , hdl:10013/epic.776d113d-c2a3-4cb5-93e6-281bdb47edb7 EPIC3Atmospheric Chemistry and Physics, COPERNICUS GESELLSCHAFT MBH, 16, pp. 12753-12765, ISSN: 1680-7316 Article isiRev 2016 ftawi https://doi.org/10.5194/acp-16-12753-2016 2024-06-24T04:18:50Z We compared star-photometry-derived, polar winter aerosol optical depths (AODs), acquired at Eureka, Nunavut, Canada, and Ny-Ålesund, Svalbard, with GEOSChem (GC) simulations as well as ground-based lidar and CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) retrievals over a sampling period of two polar winters. The results indicate significant cloud and/or low-altitude ice crystal (LIC) contamination which is only partially corrected using temporal cloud screening. Spatially homogeneous clouds and LICs that remain after temporal cloud screening represent an inevitable systematic error in the estimation of AOD: this error was estimated to vary from 78 to 210% at Eureka and from 2 to 157% at Ny-Ålesund. Lidar analysis indicated that LICs appeared to have a disproportionately large influence on the homogeneous coarse-mode optical depths that escape temporal cloud screening. In principle, spectral cloud screening (to yield fine-mode or submicron AODs) reduces pre-cloud-screened AODs to the aerosol contribution if one assumes that coarse-mode (super-micron) aerosols are a minor part of the AOD. Large, low-frequency differences between these retrieved values and their GC analogue appeared to be often linked to strong, spatially extensive planetary boundary layer events whose presence at either site was inferred from CALIOP profiles. These events were either not captured or significantly underestimated by the GC simulations. High-frequency AOD variations of GC fine-mode aerosols at Ny-Ålesund were attributed to sea salt, while low-frequency GC variations at Eureka and NyÅlesund were attributable to sulfates. CALIOP profiles and AODs were invaluable as spatial and temporal redundancy support (or, alternatively, as insightful points of contention) for star photometry retrievals and GC estimates of AOD. Article in Journal/Newspaper Eureka Nunavut Ny Ålesund Ny-Ålesund Svalbard Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Atmospheric Chemistry and Physics 16 19 12753 12765 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
We compared star-photometry-derived, polar winter aerosol optical depths (AODs), acquired at Eureka, Nunavut, Canada, and Ny-Ålesund, Svalbard, with GEOSChem (GC) simulations as well as ground-based lidar and CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) retrievals over a sampling period of two polar winters. The results indicate significant cloud and/or low-altitude ice crystal (LIC) contamination which is only partially corrected using temporal cloud screening. Spatially homogeneous clouds and LICs that remain after temporal cloud screening represent an inevitable systematic error in the estimation of AOD: this error was estimated to vary from 78 to 210% at Eureka and from 2 to 157% at Ny-Ålesund. Lidar analysis indicated that LICs appeared to have a disproportionately large influence on the homogeneous coarse-mode optical depths that escape temporal cloud screening. In principle, spectral cloud screening (to yield fine-mode or submicron AODs) reduces pre-cloud-screened AODs to the aerosol contribution if one assumes that coarse-mode (super-micron) aerosols are a minor part of the AOD. Large, low-frequency differences between these retrieved values and their GC analogue appeared to be often linked to strong, spatially extensive planetary boundary layer events whose presence at either site was inferred from CALIOP profiles. These events were either not captured or significantly underestimated by the GC simulations. High-frequency AOD variations of GC fine-mode aerosols at Ny-Ålesund were attributed to sea salt, while low-frequency GC variations at Eureka and NyÅlesund were attributable to sulfates. CALIOP profiles and AODs were invaluable as spatial and temporal redundancy support (or, alternatively, as insightful points of contention) for star photometry retrievals and GC estimates of AOD. |
format |
Article in Journal/Newspaper |
author |
O'Neill, Norman T. Baibakov, Konstantin Hesaraki, Sareh Ivanescu, Liviu Martin, Randall V. Perro, Chris Chaubey, Jai P. Herber, Andreas Duck, Thomas J. |
spellingShingle |
O'Neill, Norman T. Baibakov, Konstantin Hesaraki, Sareh Ivanescu, Liviu Martin, Randall V. Perro, Chris Chaubey, Jai P. Herber, Andreas Duck, Thomas J. Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs |
author_facet |
O'Neill, Norman T. Baibakov, Konstantin Hesaraki, Sareh Ivanescu, Liviu Martin, Randall V. Perro, Chris Chaubey, Jai P. Herber, Andreas Duck, Thomas J. |
author_sort |
O'Neill, Norman T. |
title |
Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs |
title_short |
Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs |
title_full |
Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs |
title_fullStr |
Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs |
title_full_unstemmed |
Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs |
title_sort |
temporal and spectral cloud screening of polar winter aerosol optical depth (aod): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale aods |
publisher |
COPERNICUS GESELLSCHAFT MBH |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/46151/ https://epic.awi.de/id/eprint/46151/1/acp-16-12753-2016.pdf https://www.atmos-chem-phys.net/16/12753/2016/acp-16-12753-2016.pdf https://hdl.handle.net/10013/epic.776d113d-c2a3-4cb5-93e6-281bdb47edb7 |
genre |
Eureka Nunavut Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Eureka Nunavut Ny Ålesund Ny-Ålesund Svalbard |
op_source |
EPIC3Atmospheric Chemistry and Physics, COPERNICUS GESELLSCHAFT MBH, 16, pp. 12753-12765, ISSN: 1680-7316 |
op_relation |
https://epic.awi.de/id/eprint/46151/1/acp-16-12753-2016.pdf O'Neill, N. T. , Baibakov, K. , Hesaraki, S. , Ivanescu, L. , Martin, R. V. , Perro, C. , Chaubey, J. P. , Herber, A. orcid:0000-0001-6651-3835 and Duck, T. J. (2016) Temporal and spectral cloud screening of polar winter aerosol optical depth (AOD): impact of homogeneous and inhomogeneous clouds and crystal layers on climatological-scale AODs , Atmospheric Chemistry and Physics, 16 , pp. 12753-12765 . doi:10.5194/acp-16-12753-2016 <https://doi.org/10.5194/acp-16-12753-2016> , hdl:10013/epic.776d113d-c2a3-4cb5-93e6-281bdb47edb7 |
op_doi |
https://doi.org/10.5194/acp-16-12753-2016 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
16 |
container_issue |
19 |
container_start_page |
12753 |
op_container_end_page |
12765 |
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1810442813753524224 |