Evaluation of the moisture sources in two extreme landfalling atmospheric river events using an Eulerian WRF tracers tool
A new 3-D tracer tool is coupled to the WRF model to analyze the origin of the moisture in two extreme atmospheric river (AR) events: the so-called <q>Great Coastal Gale of 2007</q> in the Pacific Ocean and the <q>Great Storm of 1987</q> in the North Atlantic. Results show th...
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ftcopernicus:oai:publications.copernicus.org:esd59780 2023-05-15T17:33:28+02:00 Evaluation of the moisture sources in two extreme landfalling atmospheric river events using an Eulerian WRF tracers tool Eiras-Barca, Jorge Dominguez, Francina Hu, Huancui Garaboa-Paz, Daniel Miguez-Macho, Gonzalo 2018-09-27 application/pdf https://doi.org/10.5194/esd-8-1247-2017 https://esd.copernicus.org/articles/8/1247/2017/ eng eng doi:10.5194/esd-8-1247-2017 https://esd.copernicus.org/articles/8/1247/2017/ eISSN: 2190-4987 Text 2018 ftcopernicus https://doi.org/10.5194/esd-8-1247-2017 2020-07-20T16:23:29Z A new 3-D tracer tool is coupled to the WRF model to analyze the origin of the moisture in two extreme atmospheric river (AR) events: the so-called <q>Great Coastal Gale of 2007</q> in the Pacific Ocean and the <q>Great Storm of 1987</q> in the North Atlantic. Results show that between 80 and 90 % of moisture advected by the ARs, and a high percentage of the total precipitation produced by the systems have a tropical origin. The tropical contribution to precipitation is in general above 50 % and largely exceeds this value in the most affected areas. Local convergence transport is responsible for the remaining moisture and precipitation. The ratio of tropical moisture to total moisture is maximized as the cold front arrives on land. Vertical cross sections of the moisture content suggest that the maximum in tropical humidity does not necessarily coincide with the low-level jet (LLJ) of the extratropical cyclone. Instead, the amount of tropical humidity is maximized in the lowest atmospheric level in southern latitudes and can be located above, below or ahead of the LLJ in northern latitudes in both analyzed cases. Text North Atlantic Copernicus Publications: E-Journals Pacific Earth System Dynamics 8 4 1247 1261 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
A new 3-D tracer tool is coupled to the WRF model to analyze the origin of the moisture in two extreme atmospheric river (AR) events: the so-called <q>Great Coastal Gale of 2007</q> in the Pacific Ocean and the <q>Great Storm of 1987</q> in the North Atlantic. Results show that between 80 and 90 % of moisture advected by the ARs, and a high percentage of the total precipitation produced by the systems have a tropical origin. The tropical contribution to precipitation is in general above 50 % and largely exceeds this value in the most affected areas. Local convergence transport is responsible for the remaining moisture and precipitation. The ratio of tropical moisture to total moisture is maximized as the cold front arrives on land. Vertical cross sections of the moisture content suggest that the maximum in tropical humidity does not necessarily coincide with the low-level jet (LLJ) of the extratropical cyclone. Instead, the amount of tropical humidity is maximized in the lowest atmospheric level in southern latitudes and can be located above, below or ahead of the LLJ in northern latitudes in both analyzed cases. |
format |
Text |
author |
Eiras-Barca, Jorge Dominguez, Francina Hu, Huancui Garaboa-Paz, Daniel Miguez-Macho, Gonzalo |
spellingShingle |
Eiras-Barca, Jorge Dominguez, Francina Hu, Huancui Garaboa-Paz, Daniel Miguez-Macho, Gonzalo Evaluation of the moisture sources in two extreme landfalling atmospheric river events using an Eulerian WRF tracers tool |
author_facet |
Eiras-Barca, Jorge Dominguez, Francina Hu, Huancui Garaboa-Paz, Daniel Miguez-Macho, Gonzalo |
author_sort |
Eiras-Barca, Jorge |
title |
Evaluation of the moisture sources in two extreme landfalling atmospheric river events using an Eulerian WRF tracers tool |
title_short |
Evaluation of the moisture sources in two extreme landfalling atmospheric river events using an Eulerian WRF tracers tool |
title_full |
Evaluation of the moisture sources in two extreme landfalling atmospheric river events using an Eulerian WRF tracers tool |
title_fullStr |
Evaluation of the moisture sources in two extreme landfalling atmospheric river events using an Eulerian WRF tracers tool |
title_full_unstemmed |
Evaluation of the moisture sources in two extreme landfalling atmospheric river events using an Eulerian WRF tracers tool |
title_sort |
evaluation of the moisture sources in two extreme landfalling atmospheric river events using an eulerian wrf tracers tool |
publishDate |
2018 |
url |
https://doi.org/10.5194/esd-8-1247-2017 https://esd.copernicus.org/articles/8/1247/2017/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
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North Atlantic |
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eISSN: 2190-4987 |
op_relation |
doi:10.5194/esd-8-1247-2017 https://esd.copernicus.org/articles/8/1247/2017/ |
op_doi |
https://doi.org/10.5194/esd-8-1247-2017 |
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Earth System Dynamics |
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8 |
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4 |
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1247 |
op_container_end_page |
1261 |
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1766131992884150272 |