Large-scale climatic patterns control large lightning fire occurrence in Canada and Alaska forest regions
Large lightning wildfires in Canada and Alaska account for most of the area burnt and are main determiners of the age mosaic of the landscape. Such fires occur when positive midtroposphere height anomalies persist > 10 days during the fire season. Midtroposphere anomalies are part of teleconnecti...
Published in: | Journal of Geophysical Research: Biogeosciences |
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American Geophysical Union
2019
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Online Access: | https://doi.org/10.1029/2006JG000181 https://ora.ox.ac.uk/objects/uuid:7c0b2f57-3371-408a-bb91-266eefe989a5 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:7c0b2f57-3371-408a-bb91-266eefe989a5 2024-09-30T14:31:33+00:00 Large-scale climatic patterns control large lightning fire occurrence in Canada and Alaska forest regions Fauria, M Johnson, E 2019-08-20 https://doi.org/10.1029/2006JG000181 https://ora.ox.ac.uk/objects/uuid:7c0b2f57-3371-408a-bb91-266eefe989a5 unknown American Geophysical Union doi:10.1029/2006JG000181 https://ora.ox.ac.uk/objects/uuid:7c0b2f57-3371-408a-bb91-266eefe989a5 https://doi.org/10.1029/2006JG000181 info:eu-repo/semantics/openAccess Journal article 2019 ftuloxford https://doi.org/10.1029/2006JG000181 2024-09-06T07:47:37Z Large lightning wildfires in Canada and Alaska account for most of the area burnt and are main determiners of the age mosaic of the landscape. Such fires occur when positive midtroposphere height anomalies persist > 10 days during the fire season. Midtroposphere anomalies are part of teleconnections which are created by atmospheric and coupled sea/air dynamics. Large lightning fire occurrence and area burnt data were used to define eight centers of large wildfire variability in Canada and Alaska during 1959-1999. Preferred positions of persistent positive midtroposphere anomalies correlated with the Fire Regions during large fire events. Active fire weather showed strong relations with Pacific Decadal Oscillation (PDO) at interdecadal timescales and with El Niño Southern Oscillation (ENSO) and Arctic Oscillation (AO) mostly at interannual (2 to 6 years) timescales. PDO and ENSO (AO) related large fires were more frequent in the western (eastern) regions. The mountain ranges in western Canada play a major role in the large-scale patterns of large fire occurrence through retention of PDO-related Pacific Ocean moisture, causing the dynamics of large fires each side of the ranges to be mostly in antiphase. The PDO/ENSO regime shift of 1976/1977, together with the strong and persistent positive phase of AO during the late 1980s and 1990s contributed to the increase in area burned in the study area except in British Columbia and Alaska. PDO-ENSO-AO interactions with active fire weather provide an explanation for changes in large fire occurrence frequency during the last centuries in the area. Copyright 2006 by the American Geophysical Union. Article in Journal/Newspaper Arctic Alaska ORA - Oxford University Research Archive Arctic British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Canada Pacific Journal of Geophysical Research: Biogeosciences 111 G4 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
unknown |
description |
Large lightning wildfires in Canada and Alaska account for most of the area burnt and are main determiners of the age mosaic of the landscape. Such fires occur when positive midtroposphere height anomalies persist > 10 days during the fire season. Midtroposphere anomalies are part of teleconnections which are created by atmospheric and coupled sea/air dynamics. Large lightning fire occurrence and area burnt data were used to define eight centers of large wildfire variability in Canada and Alaska during 1959-1999. Preferred positions of persistent positive midtroposphere anomalies correlated with the Fire Regions during large fire events. Active fire weather showed strong relations with Pacific Decadal Oscillation (PDO) at interdecadal timescales and with El Niño Southern Oscillation (ENSO) and Arctic Oscillation (AO) mostly at interannual (2 to 6 years) timescales. PDO and ENSO (AO) related large fires were more frequent in the western (eastern) regions. The mountain ranges in western Canada play a major role in the large-scale patterns of large fire occurrence through retention of PDO-related Pacific Ocean moisture, causing the dynamics of large fires each side of the ranges to be mostly in antiphase. The PDO/ENSO regime shift of 1976/1977, together with the strong and persistent positive phase of AO during the late 1980s and 1990s contributed to the increase in area burned in the study area except in British Columbia and Alaska. PDO-ENSO-AO interactions with active fire weather provide an explanation for changes in large fire occurrence frequency during the last centuries in the area. Copyright 2006 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Fauria, M Johnson, E |
spellingShingle |
Fauria, M Johnson, E Large-scale climatic patterns control large lightning fire occurrence in Canada and Alaska forest regions |
author_facet |
Fauria, M Johnson, E |
author_sort |
Fauria, M |
title |
Large-scale climatic patterns control large lightning fire occurrence in Canada and Alaska forest regions |
title_short |
Large-scale climatic patterns control large lightning fire occurrence in Canada and Alaska forest regions |
title_full |
Large-scale climatic patterns control large lightning fire occurrence in Canada and Alaska forest regions |
title_fullStr |
Large-scale climatic patterns control large lightning fire occurrence in Canada and Alaska forest regions |
title_full_unstemmed |
Large-scale climatic patterns control large lightning fire occurrence in Canada and Alaska forest regions |
title_sort |
large-scale climatic patterns control large lightning fire occurrence in canada and alaska forest regions |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
https://doi.org/10.1029/2006JG000181 https://ora.ox.ac.uk/objects/uuid:7c0b2f57-3371-408a-bb91-266eefe989a5 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
Arctic British Columbia Canada Pacific |
geographic_facet |
Arctic British Columbia Canada Pacific |
genre |
Arctic Alaska |
genre_facet |
Arctic Alaska |
op_relation |
doi:10.1029/2006JG000181 https://ora.ox.ac.uk/objects/uuid:7c0b2f57-3371-408a-bb91-266eefe989a5 https://doi.org/10.1029/2006JG000181 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2006JG000181 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
111 |
container_issue |
G4 |
_version_ |
1811636034438430720 |