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Paracas dust storms: Sources, trajectories and associated meteorological conditions

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dc.contributor.author Briceno-Zuluaga, F.
dc.contributor.author Castagna, A.
dc.contributor.author Rutllant, J. A.
dc.contributor.author Flores-Aqueveque, V.
dc.contributor.author Caquineau, S.
dc.contributor.author Sifeddine, A.
dc.contributor.author Velazco, F.
dc.contributor.author Gutierrez Aguilar, Dimitri Alexey
dc.contributor.author Cardich Salazar, Jorge Aquiles
dc.date.accessioned 2019-01-25T16:20:58Z
dc.date.available 2019-01-25T16:20:58Z
dc.date.issued 2017
dc.identifier.uri https://hdl.handle.net/20.500.12866/4817
dc.description.abstract Dust storms that develop along the Pisco-Ica desert in Southern Peru, locally known as "Paracas" winds have ecological, health and economic repercussions. Here we identify dust sources through MODIS (Moderate Resolution Imaging Spectroradiometer) imagery and analyze HYSPLIT (Hybrid Single Particles Lagrangian Integrated Trajectory) model trajectories and dispersion patterns, along with concomitant synoptic-scale meteorological conditions from National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis (NCEP/NCAR). Additionally, surface pressure data from the hourly METeorological Aerodrome Report (METAR) at Arica (18.5 degrees S, 70.3 degrees W) and Pisco (13.7 degrees S, 76.2 degrees W) were used to calculate Alongshore (sea-level) Pressure Gradient (APG) anomalies during Paracas dust storms, their duration and associated wind-speeds and wind directions. This study provides a review on the occurrence and strength of the Paracas dust storms as reported in the Pisco airfield for five-year period and their correspondence with MODIS true-color imagery in terms of dust-emission source areas. Our results show that most of the particle fluxes moving into the Ica-Pisco desert area during Paracas wind events originate over the coastal zone, where strong winds forced by steep APGs develop as the axis of a deep mid-troposphere trough sets in along north-central Chile. Direct relationships between Paracas wind intensity, number of active dust-emission sources and APGs are also documented, although the scarcity of simultaneous METAR/MODIS data for clearly observed MODIS dust plumes prevents any significant statistical inference. Synoptic-scale meteorological composites from NCEP/NCAR reanalysis data show that Paracas wind events (steep APGs) are mostly associated with the strengthening of anticyclonic conditions in northern Chile, that can be attributed to cold air advection associated with the incoming trough. Compared to the MODIS images, HYSPLIT outputs were able to spatially reproduce trajectories and dust dispersion plumes during the Paracas wind storms. HYSPLIT trajectories revealed that part of the wind-eroded lithological material can be transported downwind several kilometers along the Peruvian coast and also deposited over the nearby coastal ocean, giving support to the presence of an aeolian signal in continental shelf sediments, of great importance for paleoenvironmental studies. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Atmospheric Environment
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Environmental Sciences & Ecology en_US
dc.subject Aeolian transport en_US
dc.subject aerosols en_US
dc.subject circulation en_US
dc.subject deposition en_US
dc.subject Dust storms en_US
dc.subject HYSPLIT trajectories en_US
dc.subject intensification en_US
dc.subject Meteorology & Atmospheric Sciences en_US
dc.subject sediments en_US
dc.subject size distribution en_US
dc.subject south-america en_US
dc.subject Southern Peru en_US
dc.subject Synoptic-scale meteorological patterns en_US
dc.subject transport en_US
dc.subject west-coast en_US
dc.subject wind en_US
dc.title Paracas dust storms: Sources, trajectories and associated meteorological conditions en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.atmosenv.2017.06.019
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.08
dc.relation.issn 1873-2844


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