Changes and trends of Hadley circulation on hydroclimatic variability in the subtropical Andes

JUAN A. RIVERA; MAXIMILIANO VIALE; ELIZABETH B. NARANJO TAMAYO

Sao Paulo

Otro; Annual Meeting Paleoclimate Reconstruction School; 2019

The recent changes observed in the latitudinal position of the branch of descent ofthe Hadley circulation suggest a probable expansion towards the poles from the1970s, although with a significant interannual variability (IPCC, 2013). These resultsare independent of the data set selected for evaluation, whose expansion rate is 0.5 °of latitude per decade according to recent studies (Staten et al., 2018), althoughprevious work indicates that the expansion oscillates between 0 ° and 3 ° of latitudeper decade, which accounts for the uncertainties associated with its quantification(Birner, 2010, Davis and Rosenlof, 2012).As for future projections, it is likely that Hadley's branch of descent desplacementtowards the poles as a consequence of the increase in greenhouse gasconcentrations throughout the 21st century