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On the Relationship of a Low-Level Jet and the Formation of a Heavy-Rainfall-Producing Mesoscale Vortex over the Yangtze River Basin
Open AccessArticle

Recent Changes in the Low-Level Jet along the Subtropical West Coast of South America

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Center for Climate and Resilience Research (CR)2, Santiago 8320000, Chile
2
Escuela de Ingeniería Civil Oceánica, Facultad de Ingeniería, Universidad de Valparaíso, Valparaíso 2340000, Chile
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Millennium Nucleus Understanding Past Coastal Upwelling Systems and Environmental Local and Lasting Impacts (UPWELL), Agencia Nacional de Investigación y Desarrollo (ANID) Millennium Science Initiative, Coquimbo 1780000, Chile
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Centro de Observación Marino Para Estudios de Riesgos del Ambiente Costero, COSTAR, Valparaíso 2340000, Chile
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Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago 8320000, Chile
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Millennium Nucleus Paleoclimate, Agencia Nacional de Investigación y Desarrollo (ANID) Millennium Science Initiative, Ñuñoa 7750000, Chile
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Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo 1780000, Chile
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Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago 8320000, Chile
*
Author to whom correspondence should be addressed.
Academic Editors: Massimiliano Burlando and Pedro M. M. Soares
Atmosphere 2021, 12(4), 465; https://doi.org/10.3390/atmos12040465
Received: 20 February 2021 / Revised: 26 March 2021 / Accepted: 1 April 2021 / Published: 8 April 2021
(This article belongs to the Special Issue Characteristics of Coastal Low Level Wind Jet)
Surface winds along the subtropical west coast of South America are characterized by the quasi-weekly occurrences of low-level jet events. These short lived but intense wind events impact the coastal ocean environment. Hence, identifying long-term trends in the coastal low-level jet (CLLJ) is essential for understanding changes in marine ecosystems. Here we use ERA5 reanalysis (1979–2019) and an objective algorithm to track anticyclones to investigate recent changes in CLLJ events off central Chile (25–43 °S). Results present evidence that the number of days with intense wind (≥10 ms−1), and the number and duration of CLLJ events have significantly changed off central Chile in recent decades. There is an increase in the number of CLLJ events in the whole study area during winter (June-July-August; JJA), while during summer (December–January–February; DJF) a decrease is observed at lower latitudes (29–34 °S), and an increase is found at the southern boundary of the Humboldt system. We suggest that changes in the central pressures and frequency of extratropical, migratory anticyclones that reach the coast of South America, which force CLLJs, have played an important role in the recent CLLJ changes observed in this region. View Full-Text
Keywords: coastal winds; coastal low-level jet; upwelling favorable wind events; Humboldt upwelling system; ERA5 reanalysis coastal winds; coastal low-level jet; upwelling favorable wind events; Humboldt upwelling system; ERA5 reanalysis
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MDPI and ACS Style

Aguirre, C.; Flores-Aqueveque, V.; Vilches, P.; Vásquez, A.; Rutllant, J.A.; Garreaud, R. Recent Changes in the Low-Level Jet along the Subtropical West Coast of South America. Atmosphere 2021, 12, 465. https://doi.org/10.3390/atmos12040465

AMA Style

Aguirre C, Flores-Aqueveque V, Vilches P, Vásquez A, Rutllant JA, Garreaud R. Recent Changes in the Low-Level Jet along the Subtropical West Coast of South America. Atmosphere. 2021; 12(4):465. https://doi.org/10.3390/atmos12040465

Chicago/Turabian Style

Aguirre, Catalina; Flores-Aqueveque, Valentina; Vilches, Pablo; Vásquez, Alicia; Rutllant, José A.; Garreaud, René. 2021. "Recent Changes in the Low-Level Jet along the Subtropical West Coast of South America" Atmosphere 12, no. 4: 465. https://doi.org/10.3390/atmos12040465

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