Index

Grupo VARECLIM
Variabilidad y Reconstrucción
del Clima


Lunes, 15 de Julio del 2024








INCITE: Northerly winds in the EM & ISM


Long term variability of the northerly winds over the Eastern Mediterranean as seen from historical wind observations.


The summer circulation over the eastern Mediterranean is characterized by a persistent northerly regime whose interannual variability is modulated both by mid and tropical latitudes. In this paper, we use historical wind observations taken aboard ships to assemble the first purely instrumental index quantifying this wind system since 1880. This has allowed evaluating the multidecadal and interannual variability of the northerlies in the Eastern Mediterranean over the longest time period so far. Our results indicate that the first half of the 20th century was characterized by more frequent and persistent northerly winds in the eastern Mediterranean than the second half. We have also found that the well-known teleconnection between the eastern Mediterranean summertime winds and the Indian Summer Monsoon, with enhanced northerlies concurrent with a stronger monsoon, has not been steady along the 20th century. It is shown that the Indian summer monsoon modulation of convection over the western Indian


Key Words: Reconstruction; logbook; Eastern Mediterranean; northerly winds; ISM; Rossby waves

Reference: Gómez-Delgado, F. de Paula, D. Gallego, C. Peña-Ortiz, I. Vega, R. García-Herrera and P. Ribera, 2019: Long term variability of the northerly winds over the Eastern Mediterranean as seen from historical wind observations. Global and Planetary Change, 172, 355–364, doi:10.1016/j.gloplacha.2018.10.008





Figure 1: NWI (Northerly Wind Index) evolution for the 1880-2014 period. Black contours denote frequency values over 70%.





© I.Vega 2017