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New Insights into the South American Low-Level Jet from RELAMPAGO Observations

C. Sasaki,A. Rowe,L. McMurdie,K. Rasmussen

Published 2022 in Monthly Weather Review

ABSTRACT

The Remote sensing of Electrification, Lightning, And Mesoscale/microscale Processes with Adaptive Ground Observations (RELAMPAGO) campaign produced unparalleled observations of the South American Low-Level Jet (SALLJ) in Central Argentina with high temporal observations located in the path of the jet and upstream of rapidly growing convection. The vertical and temporal structure of the jet is characterized using 3-hourly soundings launched at two fixed sites near the Sierras de Córdoba (SDC), along with high-resolution reanalysis data. Objective SALLJ identification criteria are applied to each sounding to determine the presence, timing, and vertical characteristics of the jet. The observations largely confirm prior results showing that SALLJs most frequently come from the north, occur overnight, and peak in the low levels, though LLJs notably peaked higher near the end of longer duration events during RELAMPAGO. This study categorizes SALLJs into shorter duration events with jet cores peaking overnight in the low levels and longer 5-6-day events with elevated jets near the end of the period that lack a clear diurnal cycle. Evidence of both boundary layer processes and large-scale forcing were observed during shorter duration events, whereas synoptic forcing dominated the longer 5-6-day events. The highest amounts of moisture and larger convective coverage east of the SDC occurred near the end of the 5-6-day SALLJ events.

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