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Vicente Pérez Muñuzuri      
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Vicente Pérez Muñuzuri published an article in February 2018.
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Article 2 Reads 0 Citations Tagging moisture sources with Lagrangian and inertial tracers: Application to intense atmospheric river events Vicente Perez-Munuzuri, Jorge Eiras-Barca, Daniel Garaboa-Pa... Published: 16 February 2018
Earth System Dynamics Discussions, doi: 10.5194/esd-2018-8
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Two Lagrangian tracers tools are evaluated for studies on atmospheric moisture sources and pathways. In these methods, a moisture volume is assigned to each particle which is then advected by the wind flow. Usual Lagrangian methods consider this volume to remain constant and the particle follows flow path lines exactly. In a different approach, the initial moisture volume can be considered to depend on time as it is advected by the flow, due to thermodynamic processes. In this case, the tracer volume drag must be taken into account. Equations have been implemented and moisture convection was taken into account for both Lagrangian and inertial models. We apply these methods to evaluate the intense atmospheric rivers that devastated (i) the Pacific North West region of the United States, and (ii) the Western of the Iberian Peninsula, with flooding rains and intense winds in early November 2006, and May 20, 1994, respectively. We note that the usual Lagrangian method underestimates moisture availability in the continent while active tracers achieve more realistic results.
CONFERENCE-ARTICLE 11 Reads 0 Citations <strong>Tagging moisture sources with Eulerian and Lagrangian tracers: Application to an intense atmospheric river event... Vicente Perez-Muñuzuri, Jorge Eiras-Barca, Daniel Garaboa-Pa... Published: 08 November 2017
First International Electronic Conference on the Hydrological Cycle, doi: 10.3390/CHyCle-2017-04864
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One Eulerian and two Lagrangian tracers’ tools are evaluated for studies on atmospheric moisture sources and pathways. The first method has been recently implemented online into the Weather Research and Forecasting (WRF) mesoscale model (Insua-Costa and Míguez-Macho, 2017), while the Lagrangian methods are described here. In these methods, a moisture volume is assigned to each particle which is then advected by the wind flow. Usual Lagrangian methods consider this volume to remain constant and the particle follows exactly the stream lines of the flow (Stohl and James, 2004). On the other hand, the initial moisture volume can be thought to depend on time as the flow is advected due to thermodynamic processes (for example, pressure, and temperature changes). In this case, the drag on the tracer volume must be taken into account. Equations have been implemented and moisture convection (Forster et al., 2007) was taken into account for both Lagrangian models.

We apply these methods to evaluate the intense atmospheric river (AR; i.e., a narrow plume of strong water vapor flux) that devastated the Pacific North Western America with flooding rains and intense winds in early November 2006 (Neiman et al., 2008). We note that the usual Lagrangian method underestimate moisture availability on the continent while the active tracers (both Eulerian and Lagrangian) achieve better results.

 

Forster, C., Stohl, A. and Seibert, P. J. Applied Meteo. and Climatology. 46, 403 (2007).

Insua-Costa, D. and Míguez-Macho, G. Eath Syst. Dyn. (2017).

Neiman, P.J. et al. Monthly Wea. Rev. 136, 4398 (2008).

Stohl, A. and James, P. J. Hidrometeor. 5, 656 (2004).

Article 1 Read 0 Citations Climatology of Lyapunov exponents: The influence of atmospheric rivers on large-scale mixing variability Daniel Garaboa-Paz, Jorge Eiras-Barca, Vicente Pérez-Muñuzur... Published: 26 January 2017
Earth System Dynamics Discussions, doi: 10.5194/esd-2017-1
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Large-scale tropospheric mixing and Lagrangian transport properties have been analyzed for a long-term period 1979–2014 in terms of the finite-time Lyapunov exponents (FTLE). Wind fields reanalysis from the European Centre for Medium-Range Weather Forecasts were used to calculate Lagrangian trajectories of large ensembles of particles. The FTLE climatology shows large correlation values with the baroclinic instability growth rate. Larger values of the inter and intra-annual mixing variabilities highlight El Niño Southern Oscillation, the storm track or the Intertropical Convergence Zone among other large-scale structures. As a case study, the role that atmospheric rivers have on the large-scale atmospheric mixing and the precipitation rates observed in the Sahara-Morocco and British Isles regions have been analyzed. Atmospheric rivers contribution to tropospheric mixing is found to decrease from 15 % in Sahara-Morocco to less than 5 % for UK-Ireland regions, in agreement to their contribution to precipitation that is 40 % larger in the former than for the latter region.
Article 0 Reads 0 Citations Seasonal predictability of the winter precipitation over Iberian Peninsula and its relationship with finite-time Lyapuno... Daniel Garaboa-Paz, Nieves Lorenzo, Vicente Pérez-Muñuzuri Published: 20 December 2016
Nonlinear Processes in Geophysics Discussions, doi: 10.5194/npg-2016-79
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Seasonal forecasts have improved during the last decades, mostly due to an increase of understanding of the coupled ocean-atmosphere dynamics, and the development of models able to predict the atmosphere variability. Correlations between different teleconnection patterns and severe weather in different parts of the world have also evolved during the last years. This paper evaluates the connection between winter precipitation over the Iberian Peninsula and the large-scale tropospheric mixing over the eastern Atlantic ocean. Finite-time Lyapunov exponents (FTLE) have been calculated from 1979 to 2008 to evaluate this mixing. Our study suggests that significant negative correlations exist between summer FTLE anomalies and winter precipitation over Portugal and Spain. To understand the mechanisms behind this correlation, summer anomalies of the FTLE have also been correlated to other circulation and temperature patterns as the sea surface temperature (SST), the sea level pressure (SLP) or the geopotential. The East Atlantic (EA) teleconnection index correlates with the summer FTLE anomalies confirming their role as a seasonal predictor for winter precipitation over the Iberian Peninsula.
PREPRINT 0 Reads 0 Citations Atmospheric rivers as Lagrangian coherent structures Daniel Garaboa, Jorge Eiras-Barca, Florian Huhn, Vicente Pér... Published: 05 January 2015
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We show that filamentous Atmospheric Rivers (ARs) over the Northern Atlantic Ocean are closely linked to attracting Lagrangian Coherent Structures (LCSs) in the large scale wind field. LCSs represent lines of attraction in the evolving flow with a significant impact on all passive tracers. Using Finite-Time Lyapunov Exponents (FTLE), we extract LCSs from a two-dimensional flow derived from water vapor flux of atmospheric reanalysis data and compare them to the three-dimensional LCS obtained from the wind flow. We correlate the typical filamentous water vapor patterns of ARs with LCSs and find that LCSs bound the filaments on the back side. Passive advective transport of water vapor from tropical latitudes is potentially possible.
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