Space-time analysis of sea level in the North Atlantic from TOPEX/Poseidon satellite altimetry

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2005

Autores

Barbosa, SM (Autor) FCUP; Fernandes, MJ (Autor) FCUP; Silva, ME (Autor) FCUP

Ata de Conferência Internacional

Título: Gravity, Geoid and Space Missions

Páginas: 248-253

IAG International Symposium on Gravity, Geoid and Space Missions (GGSM 2004)

Oporto, PORTUGAL, AUG 30-SEP 03, 2004

Indexação

ISI Web of Knowledge - 6 Citações

Scopus - 6 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

Outras Informações

ID Authenticus: P-000-5SY

DOI: 10.1007/3-540-26932-0_43

Abstract (EN): Spatial and temporal sea level variability in the North Atlantic is investigated from Topex/Poseidon (T/P) altimetry data. Time series of sea level anomalies on a regular 5 degrees grid are analysed. Non-linear denoising through thresholding in the wavelet transform domain is carried out for each series in order to remove noise while preserving non-smooth features. Principal Component Analysis (PCA) is used to obtain a spatio-temporal description of the sea level field, To avoid modal mixing and improve interpretation of the principal modes, PCA is implemented separately for seasonal and trend components of the sea level field obtained from a wavelet-based multiresolution analysis. The leading pattern of the seasonal field reflects the dominance of a stable annual cycle over the study area and the change in the seasonal regime approaching the equator with contribution of the semi-annual cycle and phase-shift in the annual cycle in the tropical Atlantic. The leading pattern of the trend field is a broad spatial pattern associated with North Atlantic Oscillation (NAO), reflecting the influence of atmospheric conditions on interannual sea level variability.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6