An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000
Large (>2 μm diameter) HNO_3-containing polar stratospheric cloud (PSC) particles were measured in situ by the NOAA NO_y instrument on board the NASA ER-2 aircraft during seven flights in the 1999/2000 Arctic winter vortex. Here we discuss the detection of these large PSC particles, their spatial...
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Format: | Article in Journal/Newspaper |
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American Geophysical Union
2002
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Online Access: | https://authors.library.caltech.edu/59681/ https://authors.library.caltech.edu/59681/1/185-Northway-2002.pdf https://resolver.caltech.edu/CaltechAUTHORS:20150818-100656143 |
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ftcaltechauth:oai:authors.library.caltech.edu:59681 2023-05-15T14:27:59+02:00 An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000 Northway, M. J. Gao, R. S. Popp, P. J. Holecek, J. C. Fahey, D. W. Carslaw, K. S. Tolbert, M. A. Lait, L. R. Dhaniyala, S. Flagan, R. C. Wennberg, P. O. Mahoney, M. J. Herman, R. L. Toon, G. C. Bui, T. P. 2002-10-27 application/pdf https://authors.library.caltech.edu/59681/ https://authors.library.caltech.edu/59681/1/185-Northway-2002.pdf https://resolver.caltech.edu/CaltechAUTHORS:20150818-100656143 en eng American Geophysical Union https://authors.library.caltech.edu/59681/1/185-Northway-2002.pdf Northway, M. J. and Gao, R. S. and Popp, P. J. and Holecek, J. C. and Fahey, D. W. and Carslaw, K. S. and Tolbert, M. A. and Lait, L. R. and Dhaniyala, S. and Flagan, R. C. and Wennberg, P. O. and Mahoney, M. J. and Herman, R. L. and Toon, G. C. and Bui, T. P. (2002) An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000. Journal of Geophysical Research. Atmospheres, 107 (D20). Art. No. 8298. ISSN 2169-897X. doi:10.1029/2001JD001079. https://resolver.caltech.edu/CaltechAUTHORS:20150818-100656143 <https://resolver.caltech.edu/CaltechAUTHORS:20150818-100656143> other Article PeerReviewed 2002 ftcaltechauth https://doi.org/10.1029/2001JD001079 2021-11-11T19:05:34Z Large (>2 μm diameter) HNO_3-containing polar stratospheric cloud (PSC) particles were measured in situ by the NOAA NO_y instrument on board the NASA ER-2 aircraft during seven flights in the 1999/2000 Arctic winter vortex. Here we discuss the detection of these large PSC particles, their spatial distribution, the ambient conditions under which they were detected, and our methods for interpreting NO_y time series with respect to particle sizes and number concentrations. The particles were observed through the use of two NO_y inlets on a particle separator extending below the ER-2 aircraft. The particle phase is assumed to be nitric acid trihydrate (NAT) or nitric acid dihydrate (NAD). Over a 48-day period, particles were sampled in the Arctic vortex over a broad range of latitudes (60–85°N) and altitudes (15–21 km). Typically, regions of the atmosphere up to 4 km above the observed large particle clouds were saturated with respect to NAT. Occasionally, large particles were measured in air subsaturated with respect to NAT, suggesting ongoing particle evaporation. Vortex minimum temperatures in the observation period suggest that synoptic-scale ice saturation conditions are not required for the formation of this type of particle. Three analytical methods are used to estimate size and number concentrations from the NO_y time series. Results indicate particle sizes between 5 and 20 μm diameter and concentrations from 10^(−5) to 10^(−3) cm^(−3). These low number concentrations imply a selective nucleation mechanism. Particle sizes and number concentrations were greater during the midwinter flights than the late winter flights. Knowledge of the geographical extent of large particles, actual sampling conditions, and particle size distributions offers multiple constraints for atmospheric models of PSC formation, which will lead to a better understanding of the process of denitrification and improvements in modeling future ozone loss. Article in Journal/Newspaper Arctic Arctic Caltech Authors (California Institute of Technology) Arctic Midwinter ENVELOPE(139.931,139.931,-66.690,-66.690) Journal of Geophysical Research 107 D20 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
English |
description |
Large (>2 μm diameter) HNO_3-containing polar stratospheric cloud (PSC) particles were measured in situ by the NOAA NO_y instrument on board the NASA ER-2 aircraft during seven flights in the 1999/2000 Arctic winter vortex. Here we discuss the detection of these large PSC particles, their spatial distribution, the ambient conditions under which they were detected, and our methods for interpreting NO_y time series with respect to particle sizes and number concentrations. The particles were observed through the use of two NO_y inlets on a particle separator extending below the ER-2 aircraft. The particle phase is assumed to be nitric acid trihydrate (NAT) or nitric acid dihydrate (NAD). Over a 48-day period, particles were sampled in the Arctic vortex over a broad range of latitudes (60–85°N) and altitudes (15–21 km). Typically, regions of the atmosphere up to 4 km above the observed large particle clouds were saturated with respect to NAT. Occasionally, large particles were measured in air subsaturated with respect to NAT, suggesting ongoing particle evaporation. Vortex minimum temperatures in the observation period suggest that synoptic-scale ice saturation conditions are not required for the formation of this type of particle. Three analytical methods are used to estimate size and number concentrations from the NO_y time series. Results indicate particle sizes between 5 and 20 μm diameter and concentrations from 10^(−5) to 10^(−3) cm^(−3). These low number concentrations imply a selective nucleation mechanism. Particle sizes and number concentrations were greater during the midwinter flights than the late winter flights. Knowledge of the geographical extent of large particles, actual sampling conditions, and particle size distributions offers multiple constraints for atmospheric models of PSC formation, which will lead to a better understanding of the process of denitrification and improvements in modeling future ozone loss. |
format |
Article in Journal/Newspaper |
author |
Northway, M. J. Gao, R. S. Popp, P. J. Holecek, J. C. Fahey, D. W. Carslaw, K. S. Tolbert, M. A. Lait, L. R. Dhaniyala, S. Flagan, R. C. Wennberg, P. O. Mahoney, M. J. Herman, R. L. Toon, G. C. Bui, T. P. |
spellingShingle |
Northway, M. J. Gao, R. S. Popp, P. J. Holecek, J. C. Fahey, D. W. Carslaw, K. S. Tolbert, M. A. Lait, L. R. Dhaniyala, S. Flagan, R. C. Wennberg, P. O. Mahoney, M. J. Herman, R. L. Toon, G. C. Bui, T. P. An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000 |
author_facet |
Northway, M. J. Gao, R. S. Popp, P. J. Holecek, J. C. Fahey, D. W. Carslaw, K. S. Tolbert, M. A. Lait, L. R. Dhaniyala, S. Flagan, R. C. Wennberg, P. O. Mahoney, M. J. Herman, R. L. Toon, G. C. Bui, T. P. |
author_sort |
Northway, M. J. |
title |
An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000 |
title_short |
An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000 |
title_full |
An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000 |
title_fullStr |
An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000 |
title_full_unstemmed |
An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000 |
title_sort |
analysis of large hno_3-containing particles sampled in the arctic stratosphere during the winter of 1999/2000 |
publisher |
American Geophysical Union |
publishDate |
2002 |
url |
https://authors.library.caltech.edu/59681/ https://authors.library.caltech.edu/59681/1/185-Northway-2002.pdf https://resolver.caltech.edu/CaltechAUTHORS:20150818-100656143 |
long_lat |
ENVELOPE(139.931,139.931,-66.690,-66.690) |
geographic |
Arctic Midwinter |
geographic_facet |
Arctic Midwinter |
genre |
Arctic Arctic |
genre_facet |
Arctic Arctic |
op_relation |
https://authors.library.caltech.edu/59681/1/185-Northway-2002.pdf Northway, M. J. and Gao, R. S. and Popp, P. J. and Holecek, J. C. and Fahey, D. W. and Carslaw, K. S. and Tolbert, M. A. and Lait, L. R. and Dhaniyala, S. and Flagan, R. C. and Wennberg, P. O. and Mahoney, M. J. and Herman, R. L. and Toon, G. C. and Bui, T. P. (2002) An analysis of large HNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000. Journal of Geophysical Research. Atmospheres, 107 (D20). Art. No. 8298. ISSN 2169-897X. doi:10.1029/2001JD001079. https://resolver.caltech.edu/CaltechAUTHORS:20150818-100656143 <https://resolver.caltech.edu/CaltechAUTHORS:20150818-100656143> |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2001JD001079 |
container_title |
Journal of Geophysical Research |
container_volume |
107 |
container_issue |
D20 |
_version_ |
1766302102288596992 |