Variabilidad y Reconstrucción
del Clima

Lunes, 15 de Julio del 2024



A new generation of INstrumental Climatic Indexes. Application to the study of the monsoon-Mediterranean TEleconection

The Mediterranean climate is affected by tropical, subtropical and mid-latitude systems simultaneously. In consequence, its climate is determined both by the mid-latitude circulation and the monsoonal systems developed in both, the Atlantic and Indian Oceans. The connection between the mid-latitudes and the Mediterranean climate is relatively well understood, in part due to the existence of climatic indexes such as the “North Atlantic Oscillation Index” whose record span more than 200 years. On the other hand, the determination of the Mediterranean dependence on the tropical circulation is usually damped by the absence of long instrumental indices analogous to that of the NAO for the tropics. This fact limits our understanding of the tropics-Mediterranean relationship to studies based in relatively short time periods or in pure modelling. To improve our understanding of this subjet, the generation of new instrumental climatic indexes over the tropics is mandatory.

These new series should be long enough to allow for the characterisation of the climatic variability at secular scales. Only very recently, a new methodology based in the analysis of old logbook data have been set up to build reliable atmospheric circulation indices based in observations in areas where no other observations are available (such as the tropics). With this motivation, this proposal sets two main objectives:

  • The generation of new instrumental climatic indexes to characterise the atmospheric circulation associated to the Asian monsoon, the African monsoon and the Mediterranean basin.
  • The application of these indices to the analysis of the Mediterranean climatic variability at secular scales.

  • Among the expected results are:

  • The development of a new generation of climatic indices for the monsoon.
  • The assessment of the synoptic scale climatic patterns related to extremes of the new indices.
  • Determination of the combined effect over Mediterranean climate variability of the mid-latitudes and monsoonal circulations.
  • The variability at secular scale of the climatic patterns related to the new indices, with enphasis in the analysis of the spatiotemporal estability of the relation.

  • Key words: ICOADS, monsoon, ENSO, WASM, ISM, WNPSM, Australian summer monsoon, Etesian winds

    Research funded by the Spanish Ministry of Economy and Competitiveness through the project CGL2013-44530-P and the grant BES-2014-069733.

    West African Monsoon Indian Summer Monsoon Northerly winds in EM

    Western North Pacific Summer Monsoon Australian Monsoon

    © I.Vega 2017