Browsing by Author "Roundy, Paul"

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    Climatology of extreme cold events in the Central Peruvian Andes during austral Summer: Origin, types and teleconnections
    (Wiley, 2018-10) Sulca Jota, Juan Carlos; Vuille, Mathias; Roundy, Paul; Takahashi, Ken; Espinoza, Jhan Carlo; Silva Vidal, Yamina; Trasmonte Soto, Grace Liliam; Zubieta Barragán, Ricardo
    The climatological and large‐scale characteristics of the extreme cold events (ECEs) in the central Peruvian Andes (Mantaro basin (MB)) during austral summer (January–March) are examined using reanalysis, gridded and in‐situ surface minimum temperature (Tmin) data for the 1979‐2010 period. To describe the influence of the Madden‐Julian Oscillation (MJO) on ECEs in the MB, two ECE groups are defined on basis of the sign of the OLR anomalies in the MJO band (30‐100 days, 0‐9 eastward) at (75°W, 12.5°S). Type 1‐ ECEs occur during the suppressed convection phase of the MJO (OLR anomalies ≥ +2 W m²) while Type 2‐ECEs occur during the enhanced convection phase of the MJO (OLR anomalies ≤ ‐2 W m²). ECEs in the MB are associated with the advection of cold and dry air along the east of the Andes through equatorward propagation of extratropical Rossby wave trains (ERWTs). This cold advection weakens the Bolivian High‐Nordeste Low (BH‐NL) system over South America (SA) at upper‐tropospheric levels. The MJO is an important driver of ECEs in the MB, favoring the cold advection along the Andes during specific MJO phases. 59% of Type‐1 ECE's and 86% of Type‐2 ECE's occur in MJO Phases 7‐2. Type‐1 and 2 ECE's feature a weakened BH over SA at upper‐tropospheric levels. For Type‐1, ERWTs emanate from southeastern Africa in MJO Phases 8‐1 while ERWTs are strenghened when crossing the subtropical southern Pacific Ocean during MJO Phases 2 and 7. With respect to Type‐2, MJO Phases 7‐2 feature circumpolar Rossby wave trains propagation toward SA. Ultimately, MJO Phases 7‐2 induce negative Tmin anomalies over MB, while MJO Phases 3‐6 induce positive Tmin anomalies. El Niño and La Niña strengthen negative Tmin anomalies over the MB during MJO Phases 7‐8 while they weaken positive Tmin anomalies over the MB during MJO Phases 3‐6.
    Palabras clave:Atmospheric teleconnectionsBolivian highCentral Peruvian Andes
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    Impactos de la concurrencia de la Oscilación Madden-Julian (MJO) y de El Niño-Oscilación Sur (ENOS) en las temperaturas mínimas de verano en los Andes centrales del Perú
    (Instituto Geofísico del Perú, 2018-11) Sulca Jota, Juan Carlos; Vuille, Mathias; Roundy, Paul; Takahashi, Ken; Espinoza, Jhan Carlo; Silva Vidal, Yamina; Trasmonte, Grace; Zubieta Barragán, Ricardo
    El presente estudio tiene por objetivo caracterizar los patrones de anomalías de Tmin cuando coinciden la MJO y las diferentes fases del ENOS durante el verano. La principal expectativa de este estudio es proporcionar material para la mejora del sistema de monitoreo de eventos fríos extremos en los Andes centrales peruanos y así reducir los daños en los cultivos locales.
    Palabras clave:Circulación atmosféricaEl NiñoFenómeno El Niño