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Trends and interannual oscillations in the main sea‐level surface pressure patterns over the Mediterranean 1955–1990
Author(s) -
Ribera P.,
Garcia R.,
Diaz H. F.,
Gimeno L.,
Hernandez E.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl010899
Subject(s) - singular spectrum analysis , climatology , principal component analysis , amplitude , north atlantic oscillation , oscillation (cell signaling) , mediterranean climate , spectral analysis , mediterranean sea , surface pressure , geology , environmental science , frequency domain , sea level , atmospheric sciences , physics , oceanography , singular value decomposition , geography , mathematics , spectroscopy , mathematical analysis , statistics , archaeology , algorithm , quantum mechanics , biology , genetics
The evolution of the main sea level pressure patterns built from Rotated Principal Component Analysis (RPCA) over a domain centered on the Mediterranean for the period 1955–1990 is examined. The annual cycle and the interannual variations are analyzed using Singular Spectrum Analysis (SSA) and three methods of spectral analysis, to detect trends and oscillations in the main patterns. The dominant patterns show oscillations characteristic of NAO and SO. This paper shows that NAO and SO seem to be correlated in a band centered in 6–8 years and that SLP behaviour over the region is dominated by QBO (which controls the oscillation frequency) while NAO modulates the amplitudes.