A pervasive and persistent Asian dust event over North America during spring 2010: lidar and sunphotometer observations
Among the many well-documented cases of springtime trans-Pacific transport of crustal dust from Asia to North America (significant events include those of 1998, 2001, and 2005), the events of March and April 2010 were extraordinary both in the extent of the dust distribution and in the unique meteor...
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ftdoajarticles:oai:doaj.org/article:d20b471782c042298d056dfc45f78841 2023-05-15T13:06:53+02:00 A pervasive and persistent Asian dust event over North America during spring 2010: lidar and sunphotometer observations P. Cottle K. Strawbridge I. McKendry N. O'Neill A. Saha 2013-05-01T00:00:00Z https://doi.org/10.5194/acp-13-4515-2013 https://doaj.org/article/d20b471782c042298d056dfc45f78841 EN eng Copernicus Publications http://www.atmos-chem-phys.net/13/4515/2013/acp-13-4515-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-13-4515-2013 1680-7316 1680-7324 https://doaj.org/article/d20b471782c042298d056dfc45f78841 Atmospheric Chemistry and Physics, Vol 13, Iss 9, Pp 4515-4527 (2013) Physics QC1-999 Chemistry QD1-999 article 2013 ftdoajarticles https://doi.org/10.5194/acp-13-4515-2013 2022-12-31T02:07:34Z Among the many well-documented cases of springtime trans-Pacific transport of crustal dust from Asia to North America (significant events include those of 1998, 2001, and 2005), the events of March and April 2010 were extraordinary both in the extent of the dust distribution and in the unique meteorological conditions that caused the dust layers in the free troposphere to linger and be detectable across Canada and the northern United States for over a month. This study focuses on extending previous research by combining data from CORALNet (Canadian Operational Research Aerosol Lidar Network) lidars in Vancouver, BC, and Egbert, ON, with AERONET (AErosol RObotic NETwork) sunphotometer retrievals and model results from HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectory) and NAAPS (Navy Aerosol Analysis and Prediction System) to monitor the arrival and distribution of dust layers across North America. This is the first documented instance of lidar detection of Asian dust from the Egbert CORALNet installation, where layers identified as dust using depolarization ratios corresponded with retrievals of coarse-mode optical depth at the co-located AEROCAN/AERONET site. In Vancouver dust layer depolarization ratios varied from 0.27 for dust above 6 km to less than 0.10 for the first 1.5–2 km above the surface. Similar layers of elevated dust exhibited much lower volume depolarization ratios for all altitudes in Egbert, ON, where maximum depolarization ratios stayed below 0.15 for all layers from 2–8 km with no clear variation with altitude, or over time. The relative lack of variation is an indication that as the layers of dust were transported across North America the rates of change in their optical properties slowed. HYSPLIT back trajectories performed throughout the free troposphere above these sites showed a majority of air parcels originating from central Asia on the days in question. Using these techniques, it was shown that elevated layers of aerosol reaching the west coast of North America as early ... Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Canada Egbert ENVELOPE(-69.649,-69.649,-69.951,-69.951) Pacific Atmospheric Chemistry and Physics 13 9 4515 4527 |
institution |
Open Polar |
collection |
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 P. Cottle K. Strawbridge I. McKendry N. O'Neill A. Saha A pervasive and persistent Asian dust event over North America during spring 2010: lidar and sunphotometer observations |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Among the many well-documented cases of springtime trans-Pacific transport of crustal dust from Asia to North America (significant events include those of 1998, 2001, and 2005), the events of March and April 2010 were extraordinary both in the extent of the dust distribution and in the unique meteorological conditions that caused the dust layers in the free troposphere to linger and be detectable across Canada and the northern United States for over a month. This study focuses on extending previous research by combining data from CORALNet (Canadian Operational Research Aerosol Lidar Network) lidars in Vancouver, BC, and Egbert, ON, with AERONET (AErosol RObotic NETwork) sunphotometer retrievals and model results from HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectory) and NAAPS (Navy Aerosol Analysis and Prediction System) to monitor the arrival and distribution of dust layers across North America. This is the first documented instance of lidar detection of Asian dust from the Egbert CORALNet installation, where layers identified as dust using depolarization ratios corresponded with retrievals of coarse-mode optical depth at the co-located AEROCAN/AERONET site. In Vancouver dust layer depolarization ratios varied from 0.27 for dust above 6 km to less than 0.10 for the first 1.5–2 km above the surface. Similar layers of elevated dust exhibited much lower volume depolarization ratios for all altitudes in Egbert, ON, where maximum depolarization ratios stayed below 0.15 for all layers from 2–8 km with no clear variation with altitude, or over time. The relative lack of variation is an indication that as the layers of dust were transported across North America the rates of change in their optical properties slowed. HYSPLIT back trajectories performed throughout the free troposphere above these sites showed a majority of air parcels originating from central Asia on the days in question. Using these techniques, it was shown that elevated layers of aerosol reaching the west coast of North America as early ... |
format |
Article in Journal/Newspaper |
author |
P. Cottle K. Strawbridge I. McKendry N. O'Neill A. Saha |
author_facet |
P. Cottle K. Strawbridge I. McKendry N. O'Neill A. Saha |
author_sort |
P. Cottle |
title |
A pervasive and persistent Asian dust event over North America during spring 2010: lidar and sunphotometer observations |
title_short |
A pervasive and persistent Asian dust event over North America during spring 2010: lidar and sunphotometer observations |
title_full |
A pervasive and persistent Asian dust event over North America during spring 2010: lidar and sunphotometer observations |
title_fullStr |
A pervasive and persistent Asian dust event over North America during spring 2010: lidar and sunphotometer observations |
title_full_unstemmed |
A pervasive and persistent Asian dust event over North America during spring 2010: lidar and sunphotometer observations |
title_sort |
pervasive and persistent asian dust event over north america during spring 2010: lidar and sunphotometer observations |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/acp-13-4515-2013 https://doaj.org/article/d20b471782c042298d056dfc45f78841 |
long_lat |
ENVELOPE(-69.649,-69.649,-69.951,-69.951) |
geographic |
Canada Egbert Pacific |
geographic_facet |
Canada Egbert Pacific |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Chemistry and Physics, Vol 13, Iss 9, Pp 4515-4527 (2013) |
op_relation |
http://www.atmos-chem-phys.net/13/4515/2013/acp-13-4515-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-13-4515-2013 1680-7316 1680-7324 https://doaj.org/article/d20b471782c042298d056dfc45f78841 |
op_doi |
https://doi.org/10.5194/acp-13-4515-2013 |
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Atmospheric Chemistry and Physics |
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13 |
container_issue |
9 |
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4515 |
op_container_end_page |
4527 |
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1766025300357939200 |