RT Journal Article
T1 Climatology of Lyapunov exponents: the link between atmospheric rivers and large-scale mixing variability
A1 Garaboa Paz, Ángel Daniel
A1 Eiras Barca, Jorge
A1 Pérez Muñuzuri, Vicente
AB Large-scale tropospheric mixing and Lagrangian transport properties have been analyzed for thelong-term period 1979–2014 in terms of the finite-time Lyapunov exponents (FTLEs).Wind field reanalyses fromthe European Centre for Medium-Range Weather Forecasts were used to calculate the Lagrangian trajectoriesof large ensembles of particles. Larger values of the interannual and intra-annual mixing variabilities highlightthe El Niño Southern Oscillation, the storm track, or the Intertropical Convergence Zone among other largescalestructures. The mean baroclinic instability growth rate and the mean atmospheric river occurrence showlarge correlation values with the FTLE climatology as an indication of their influence on tropospheric mixing inthe midlatitudes. As a case study, the role that land-falling atmospheric rivers have on large-scale troposphericmixing and the precipitation rates observed in Saharan Morocco and the British Isles has been analyzed. Theatmospheric river contribution to tropospheric mixing is found to decrease from 15% in Saharan Morocco toless than 5% for the UK and Ireland regions, in agreement with their contribution to precipitation that is 40%larger in the former than in the latter region.
PB Copernicus Publications
SN 2190-4979
YR 2017
FD 2017
LK http://hdl.handle.net/10347/22791
UL http://hdl.handle.net/10347/22791
LA eng
NO Garaboa-Paz, D., Eiras-Barca, J., and Pérez-Muñuzuri, V.: Climatology of Lyapunov exponents: the link between atmospheric rivers and large-scale mixing variability, Earth Syst. Dynam., 8, 865–873, https://doi.org/10.5194/esd-8-865-2017, 2017
NO ERA-Interim data were supported byECMWF. This work was financially supported by Ministerio deEconomía y Competitividad and Xunta de Galicia (CGL2013-45932-R, GPC2015/014) and contributions by the COST ActionMP1305 and CRETUS Strategic Partnership (AGRUP2015/02).All these programs are co-funded by ERDF (EU)
DS Minerva
RD 24 abr 2026