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Open AccessArticle

Change of the Rainfall Seasonality Over Central Peruvian Andes: Onset, End, Duration and Its Relationship With Large-Scale Atmospheric Circulation

1
Instituto Geofísico del Perú (IGP), Lima 15012, Peru
2
Universidad Nacional Agraria la Molina (UNALM), Programa de Doctorado en Recursos Hídricos, Lima 15024, Peru
*
Author to whom correspondence should be addressed.
Current address: Calle Badajoz 169 Urb. Mayorazgo IV Etapa, Ate, Lima 15012, Peru.
Climate 2020, 8(2), 23; https://doi.org/10.3390/cli8020023
Received: 5 January 2020 / Accepted: 20 January 2020 / Published: 28 January 2020
(This article belongs to the Special Issue From Local to Global Precipitation Dynamics and Climate Interaction)
Changes of the onset dates, end dates, and duration of the rainy season over central Peruvian Andes (Mantaro river basin, MRB) could severely affect water resources management and the main economic activities (e.g., rainfed agriculture, raising cattle, among others). Nonetheless, these changes have not been documented for the Tropical Andes. To asses that, we used daily datasets of observed rainfall during the 1965–2013 period. For this period, the average onset (end) date of the rainy season over the MRB occurs in the pentad 17 (19–23 September) [pentad 57 (7–11 April)]. The duration of the rainy season mainly is modulated by the onset dates due to it has higher variability than end dates. There is a reduction of 3 days/decade in the duration of wet season over the MRB for the last four decades due to the delay of the onset days. Furthermore, El Niño favors late-onset and early end of the rainy season, while La Niña favors early onset and late end of the rainy season in the MRB. Onset dates are related to the propagation of the convective region of the South American Monsoon System (SAMS), from the Caribbean region toward the central Amazon basin. Early (late)-onset days are associated with a southward (northward) shift of the South Atlantic Convergence Zone (SACZ) and weak (strong) convection over equatorial Atlantic that induces the southernmost propagation (eastward shift) of the SAMS. View Full-Text
Keywords: rainy season duration; onset and end dates; central Peruvian Andes; rainfall seasonality; Mantaro river basin rainy season duration; onset and end dates; central Peruvian Andes; rainfall seasonality; Mantaro river basin
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MDPI and ACS Style

Giráldez, L.; Silva, Y.; Zubieta, R.; Sulca, J. Change of the Rainfall Seasonality Over Central Peruvian Andes: Onset, End, Duration and Its Relationship With Large-Scale Atmospheric Circulation. Climate 2020, 8, 23.

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