Group seminar on 31. May, 14:15 CET
Influence of the South American Low-Level Jet on precipitation over the South-Western Andes of Peru
The South American Low-Level Jet (SALLJ) is one of the main climate patterns associated with precipitation from Amazonia along the lee side of the Andes. A recent definition of this jet was conducted by C. Jones (2019) classifying it in (1) Northern, (2) Central, and (3) Simultaneous branches, all with characteristic tropical-extratropical atmospheric wave train propagation signatures. In this seminar, I will present regional analysis research carried out together with a joint climate group in Brasil on the SALLJ. I will describe the atmospheric influence of the spatial distribution of this jet on extreme rainfall variability in the Southern Peruvian highlands (SPH) during the austral early rainy season (January - February). I will explain the main large-scale atmospheric teleconnections related to wet spells and the SALLJ branches by showing statistical and composite analysis with daily meteorological observations and hourly ERA5-reanalysis information. Results of our study suggest atmospheric mechanisms associated with the jet branches and the relationship with the enhancement of extreme rainfall spells over a known climatic dry zone along the South-Western Andes of Peru. The conceptual teleconnections framework can help to improve the weather and climate prediction of extremes in the region.