Aircraft-based observation of meteoric material in lower-stratospheric aerosol particles between 15 and 68° N
We analyse aerosol particle composition measurements from five research missions between 2014 and 2018 to assess the meridional extent of particles containing meteoric material in the upper troposphere and lower stratosphere (UTLS). Measurements from the Jungfraujoch mountaintop site and a low-altit...
Published in: | Atmospheric Chemistry and Physics |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Other/Unknown Material |
Language: | English |
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2021
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Online Access: | https://doi.org/10.5194/acp-21-989-2021 https://acp.copernicus.org/articles/21/989/2021/ |
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Copernicus Publications: E-Journals |
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We analyse aerosol particle composition measurements from five research missions between 2014 and 2018 to assess the meridional extent of particles containing meteoric material in the upper troposphere and lower stratosphere (UTLS). Measurements from the Jungfraujoch mountaintop site and a low-altitude aircraft mission show that meteoric material is also present within middle- and lower-tropospheric aerosol but within only a very small proportion of particles. For both the UTLS campaigns and the lower- and mid-troposphere observations, the measurements were conducted with single-particle laser ablation mass spectrometers with bipolar-ion detection, which enabled us to measure the chemical composition of particles in a diameter range of approximately 150 nm to 3 µm . The five UTLS aircraft missions cover a latitude range from 15 to 68 ∘ N, altitudes up to 21 km , and a potential temperature range from 280 to 480 K . In total, 338 363 single particles were analysed, of which 147 338 were measured in the stratosphere. Of these total particles, 50 688 were characterized by high abundances of magnesium and iron, together with sulfuric ions, the vast majority (48 610) in the stratosphere, and are interpreted as meteoric material immersed or dissolved within sulfuric acid. It must be noted that the relative abundance of such meteoric particles may be overestimated by about 10 % to 30 % due to the presence of pure sulfuric acid particles in the stratosphere which are not detected by the instruments used here. Below the tropopause, the observed fraction of the meteoric particle type decreased sharply with 0.2 %–1 % abundance at Jungfraujoch, and smaller abundances (0.025 %–0.05 %) were observed during the lower-altitude Canadian Arctic aircraft measurements. The size distribution of the meteoric sulfuric particles measured in the UTLS campaigns is consistent with earlier aircraft-based mass-spectrometric measurements, with only 5 %–10 % fractions in the smallest particles detected (200–300 nm diameter) but with substantial ( > 40 %) abundance fractions for particles from 300–350 up to 900 nm in diameter, suggesting sedimentation is the primary loss mechanism. In the tropical lower stratosphere, only a small fraction ( < 10 %) of the analysed particles contained meteoric material. In contrast, in the extratropics the observed fraction of meteoric particles reached 20 %–40 % directly above the tropopause. At potential temperature levels of more than 40 K above the thermal tropopause, particles containing meteoric material were observed in much higher relative abundances than near the tropopause, and, at these altitudes, they occurred at a similar abundance fraction across all latitudes and seasons measured. Above 440 K , the observed fraction of meteoric particles is above 60 % at latitudes between 20 and 42 ∘ N. Meteoric smoke particles are transported from the mesosphere into the stratosphere within the winter polar vortex and are subsequently distributed towards low latitudes by isentropic mixing, typically below a potential temperature of 440 K . By contrast, the findings from the UTLS measurements show that meteoric material is found in stratospheric aerosol particles at all latitudes and seasons, which suggests that either isentropic mixing is effective also above 440 K or that meteoric fragments may be the source of a substantial proportion of the observed meteoric material. |
format |
Other/Unknown Material |
author |
Schneider, Johannes Weigel, Ralf Klimach, Thomas Dragoneas, Antonis Appel, Oliver Hünig, Andreas Molleker, Sergej Köllner, Franziska Clemen, Hans-Christian Eppers, Oliver Hoppe, Peter Hoor, Peter Mahnke, Christoph Krämer, Martina Rolf, Christian Grooß, Jens-Uwe Zahn, Andreas Obersteiner, Florian Ravegnani, Fabrizio Ulanovsky, Alexey Schlager, Hans Scheibe, Monika Diskin, Glenn S. DiGangi, Joshua P. Nowak, John B. Zöger, Martin Borrmann, Stephan |
spellingShingle |
Schneider, Johannes Weigel, Ralf Klimach, Thomas Dragoneas, Antonis Appel, Oliver Hünig, Andreas Molleker, Sergej Köllner, Franziska Clemen, Hans-Christian Eppers, Oliver Hoppe, Peter Hoor, Peter Mahnke, Christoph Krämer, Martina Rolf, Christian Grooß, Jens-Uwe Zahn, Andreas Obersteiner, Florian Ravegnani, Fabrizio Ulanovsky, Alexey Schlager, Hans Scheibe, Monika Diskin, Glenn S. DiGangi, Joshua P. Nowak, John B. Zöger, Martin Borrmann, Stephan Aircraft-based observation of meteoric material in lower-stratospheric aerosol particles between 15 and 68° N |
author_facet |
Schneider, Johannes Weigel, Ralf Klimach, Thomas Dragoneas, Antonis Appel, Oliver Hünig, Andreas Molleker, Sergej Köllner, Franziska Clemen, Hans-Christian Eppers, Oliver Hoppe, Peter Hoor, Peter Mahnke, Christoph Krämer, Martina Rolf, Christian Grooß, Jens-Uwe Zahn, Andreas Obersteiner, Florian Ravegnani, Fabrizio Ulanovsky, Alexey Schlager, Hans Scheibe, Monika Diskin, Glenn S. DiGangi, Joshua P. Nowak, John B. Zöger, Martin Borrmann, Stephan |
author_sort |
Schneider, Johannes |
title |
Aircraft-based observation of meteoric material in lower-stratospheric aerosol particles between 15 and 68° N |
title_short |
Aircraft-based observation of meteoric material in lower-stratospheric aerosol particles between 15 and 68° N |
title_full |
Aircraft-based observation of meteoric material in lower-stratospheric aerosol particles between 15 and 68° N |
title_fullStr |
Aircraft-based observation of meteoric material in lower-stratospheric aerosol particles between 15 and 68° N |
title_full_unstemmed |
Aircraft-based observation of meteoric material in lower-stratospheric aerosol particles between 15 and 68° N |
title_sort |
aircraft-based observation of meteoric material in lower-stratospheric aerosol particles between 15 and 68° n |
publishDate |
2021 |
url |
https://doi.org/10.5194/acp-21-989-2021 https://acp.copernicus.org/articles/21/989/2021/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
eISSN: 1680-7324 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/603557 info:eu-repo/grantAgreement/EC/FP7/321040 doi:10.5194/acp-21-989-2021 https://acp.copernicus.org/articles/21/989/2021/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-21-989-2021 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
21 |
container_issue |
2 |
container_start_page |
989 |
op_container_end_page |
1013 |
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1766349976217059328 |
spelling |
ftcopernicus:oai:publications.copernicus.org:acp86753 2023-05-15T15:19:46+02:00 Aircraft-based observation of meteoric material in lower-stratospheric aerosol particles between 15 and 68° N Schneider, Johannes Weigel, Ralf Klimach, Thomas Dragoneas, Antonis Appel, Oliver Hünig, Andreas Molleker, Sergej Köllner, Franziska Clemen, Hans-Christian Eppers, Oliver Hoppe, Peter Hoor, Peter Mahnke, Christoph Krämer, Martina Rolf, Christian Grooß, Jens-Uwe Zahn, Andreas Obersteiner, Florian Ravegnani, Fabrizio Ulanovsky, Alexey Schlager, Hans Scheibe, Monika Diskin, Glenn S. DiGangi, Joshua P. Nowak, John B. Zöger, Martin Borrmann, Stephan 2021-01-26 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/acp-21-989-2021 https://acp.copernicus.org/articles/21/989/2021/ eng eng info:eu-repo/grantAgreement/EC/FP7/603557 info:eu-repo/grantAgreement/EC/FP7/321040 doi:10.5194/acp-21-989-2021 https://acp.copernicus.org/articles/21/989/2021/ info:eu-repo/semantics/openAccess eISSN: 1680-7324 info:eu-repo/semantics/Text 2021 ftcopernicus https://doi.org/10.5194/acp-21-989-2021 2021-02-01T17:21:49Z We analyse aerosol particle composition measurements from five research missions between 2014 and 2018 to assess the meridional extent of particles containing meteoric material in the upper troposphere and lower stratosphere (UTLS). Measurements from the Jungfraujoch mountaintop site and a low-altitude aircraft mission show that meteoric material is also present within middle- and lower-tropospheric aerosol but within only a very small proportion of particles. For both the UTLS campaigns and the lower- and mid-troposphere observations, the measurements were conducted with single-particle laser ablation mass spectrometers with bipolar-ion detection, which enabled us to measure the chemical composition of particles in a diameter range of approximately 150 nm to 3 µm . The five UTLS aircraft missions cover a latitude range from 15 to 68 ∘ N, altitudes up to 21 km , and a potential temperature range from 280 to 480 K . In total, 338 363 single particles were analysed, of which 147 338 were measured in the stratosphere. Of these total particles, 50 688 were characterized by high abundances of magnesium and iron, together with sulfuric ions, the vast majority (48 610) in the stratosphere, and are interpreted as meteoric material immersed or dissolved within sulfuric acid. It must be noted that the relative abundance of such meteoric particles may be overestimated by about 10 % to 30 % due to the presence of pure sulfuric acid particles in the stratosphere which are not detected by the instruments used here. Below the tropopause, the observed fraction of the meteoric particle type decreased sharply with 0.2 %–1 % abundance at Jungfraujoch, and smaller abundances (0.025 %–0.05 %) were observed during the lower-altitude Canadian Arctic aircraft measurements. The size distribution of the meteoric sulfuric particles measured in the UTLS campaigns is consistent with earlier aircraft-based mass-spectrometric measurements, with only 5 %–10 % fractions in the smallest particles detected (200–300 nm diameter) but with substantial ( > 40 %) abundance fractions for particles from 300–350 up to 900 nm in diameter, suggesting sedimentation is the primary loss mechanism. In the tropical lower stratosphere, only a small fraction ( < 10 %) of the analysed particles contained meteoric material. In contrast, in the extratropics the observed fraction of meteoric particles reached 20 %–40 % directly above the tropopause. At potential temperature levels of more than 40 K above the thermal tropopause, particles containing meteoric material were observed in much higher relative abundances than near the tropopause, and, at these altitudes, they occurred at a similar abundance fraction across all latitudes and seasons measured. Above 440 K , the observed fraction of meteoric particles is above 60 % at latitudes between 20 and 42 ∘ N. Meteoric smoke particles are transported from the mesosphere into the stratosphere within the winter polar vortex and are subsequently distributed towards low latitudes by isentropic mixing, typically below a potential temperature of 440 K . By contrast, the findings from the UTLS measurements show that meteoric material is found in stratospheric aerosol particles at all latitudes and seasons, which suggests that either isentropic mixing is effective also above 440 K or that meteoric fragments may be the source of a substantial proportion of the observed meteoric material. Other/Unknown Material Arctic Copernicus Publications: E-Journals Arctic Atmospheric Chemistry and Physics 21 2 989 1013 |