SciELO - Scientific Electronic Library Online

 
vol.60 issue3Nuclear abnormalities in erythrocytes and morphometric indexes in the catfish Cathorops spixii (Ariidae) from different sites on the southeastern Brazilian coastPopulation biology and diet of the southern kingcroaker Menticirrhus americanus (Linnaeus, 1758) (Perciformes: Sciaenidae) in Caraguatatuba Bay, southeastern Brazil author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Brazilian Journal of Oceanography

Print version ISSN 1679-8759

Abstract

COSTA, Mabel Calim  and  BERNARDES, Marcos Eduardo Cordeiro. Remote wind stress influence on mean sea level in a subtropical coastal region. Braz. j. oceanogr. [online]. 2012, vol.60, n.3, pp. 331-342. ISSN 1679-8759.  http://dx.doi.org/10.1590/S1679-87592012000300006.

The purpose of this study was to assess the relative influence of remote wind stress on mean sea level (MSL) variations in the coastal region of Cananeia (Sao Paulo State, Southern Brazil) during the period from 1/1/1955 to 12/31/1993. An optimized low-pass Thompson filter for the study area, and spectral analysis (cross spectrum, coherence and phase lag) of the relationship between the MSL and both parallel (T//) and perpendicular (T|) wind stress components were applied. These were extracted from four grid points of the NCEP/NCAR global model. The predominance of annual oscillations as those of greatest coherence and energy, of periods of approximately 341 days (frequency of 0.00293 cpd) and 410 days (frequency of 0.00244 cpd), respectively, were observed. Offshore NCEP/NCAR grid points were those with the highest coherence and energy throughout the study in relation to the observed MSL. This may be linked to the restriction of the NCEP/NCAR model as regards the inland limit. It is also concluded that remote wind stress may play an important role in several MSL time scales, including the annual ones. Based on criteria such as coherence and energy peaks, the wind stress component of greatest effect on MSL was the parallel one.

Keywords : Thompson filter; Spectral analysis; NCEP [NCAR]; Cananeia; Brazil.

        · abstract in Portuguese     · text in English     · pdf in English