South Atlantic explosive cyclones in 2014-2015: study employing NCEP2 and MERRA-2 reanalyses

Abstract

An analysis of explosive cyclone cases was produced by comparing the reanalysis of MERRA-2 (high spatial resolution) and NCEP2 (low spatial resolution) to South Atlantic in the 2014-2015 period. A total of 51 cases were found, of which 49 were detected by the first reanalysis and 33 by the second (2 cases identified by NCEP2 were not identified by MERRA-2). Spring was the dominant season in the formation of the cases in both reanalyses. It was observed that most systems are formed preferentially eastward of a preexisting trough at higher levels, while others are formed under an almost zonal upper airstream. This difference is more evident in the NCEP2. It was also diagnosed that the MERRA-2 shows more clearly the diffluence in the 250 hPa flow.The analysis of the composite fields revealed a negative horizontal tilt of the trough in 500 hPa, influenced by intense convection as the system develops. Besides, it pointed to a more pronounced jet stream in intense explosive cyclones and more prominent diffluence in non-intense cases. Since the NCEP2 reanalysis detected fewer cases (and only 2 intense) than MERRA-2, it was considered that the former is less suited to the analysis of this type of event.

Análisis climático del Alto Valle de Río Negro para implementación de estrategias de diseño bioclimático

“…Estos datos, horarios, mensuales o anuales son estimaciones climatológicas dedicadas a proporcionar datos confiables de recursos solares y meteorológicos en cualquier punto del planeta, y son de utilidad fundamentalmente en regiones donde las mediciones de la superficie son escasas o inexistentes. Si bien se trata de estimaciones, existen antecedentes que validan la aplicación de esta metodología para fines agrícolas(Rosales et al, 2020), meteorología(Andrade et al, 2022) o energías renovables(Richardson & Andrews, 2014).Ante la revisión bibliográfica realizada, se detecta que existen publicados datos insuficientes, parciales, con diferentes estructuras, que se presentan en la Tabla 1; luego contamos con datos obtenidos a pedido al SMN, y finalmente con datos satelitales tele-detectados que requieren validación y contrastación con registros empíricos. 9 ¿Qué estrategias bioclimáticas se deben implementar en esta región para alcanzar condiciones de confort higrotérmico sin energía adicional?…”