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https://doi.org/10.5194/esd-2017-63
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
27 Jun 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Earth System Dynamics (ESD) and is expected to appear here in due course.
Evaluation of the Moisture Sources in two Extreme Landfalling Atmospheric River Events using an Eulerian WRF-Tracers tool
Jorge Eiras-Barca1, Francina Dominguez2, Huancui Hu2, A. Daniel Garaboa-Paz1, and Gonzalo Miguez-Macho1 1Non-Linear Physics Group, Universidad de Santiago de Compostela, Galicia, Spain
2Departament of Atmopsheric Sciences, University of Illinois at Urbana-Champaign, IL
Abstract. A new 3D 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 Great Coast Gale of 2007 in the Pacific Basin, and the Great Storm of 1987 in the North Atlantic. Results show that between 80 % and 90 % of the moisture advected by the ARs, as well as between 70 % and 80 % of the associated precipitation have a tropical or subtropical origin. 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 to land. Vertical cross sections of the moisture suggest that the maximum in 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 the LLJ in northern latitudes in both analyzed cases.

Citation: Eiras-Barca, J., Dominguez, F., Hu, H., Garaboa-Paz, A. D., and Miguez-Macho, G.: Evaluation of the Moisture Sources in two Extreme Landfalling Atmospheric River Events using an Eulerian WRF-Tracers tool, Earth Syst. Dynam. Discuss., https://doi.org/10.5194/esd-2017-63, in review, 2017.
Jorge Eiras-Barca et al.
Jorge Eiras-Barca et al.

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Short summary
This paper analizes the origin of the moisture in two extremely important Atmospheric River (and extreme precipitation) events. The distribution of the moisture with regard to the low-level jet is analized as well, and the classic association of the Atmospheric River to the former is discussed.
This paper analizes the origin of the moisture in two extremely important Atmospheric River (and...
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