Circulation in the Gulf of Mexico induced by tides, wind and the Yucatan Current

A three-dimensional model is used to study the circulation in the Gulf of Mexico. Currents associated with tides, wind and the Yucatan Current are presented. Each one of these forcings is analyzed by itself and as a combined effect of the three. We were able to closely reproduce the circulation and elevation fields due to the tides. By forcing the model with winds, an anticyclonic circulation is obtained in the western region of the gulf. This feature has been associated in other studies with the local wind forcing and with the anticyclonic gyres generated in the eastern part of the gulf. Results of this work suggest that the detachment of the gyres is mainly a baroclinic process. The contribution of the barotropic flux of the Yucatan Current is found to be restricted to the eastern part of the basin

Arangio-Ruiz e i Basilici: uno scritto (quasi) inedito

Il contributo propone uno scritto inedito di Arangio-Ruiz all'allora Ministro dell'Educazione Nazionale, poi ripreso in un suo celebre articolo, sulla questione dell'edizione dei Basilici dai manoscritti conservati a Parig

Principal modes and related frequencies of sea surface temperature variability in the Pacific coast of North America

We examined monthly time-series (1950 to 1999) of sea surface temperature (SST) anomalies in 47 quadrants (2° 2°) along the Pacific coast of North America. Correlation, clustering and principal components analyses were applied to identify the spatial structure in coastal SST. The resulting modes and the individual series were investigated using spectral analysis to identify the most significant time-scales of variability, and the propagation of the main signals was explored by computing the wavenumber-frequency spectrum of each spatial mode. Results showed that coastal SST variability in the northeast Pacific conformed to three main geographical modes. A tropical mode extends from the equator to about the entrance to the Gulf of California. This mode appears related to two low frequency components of the El Niño-Southern Oscillation of about 3 and 5 years. The SST anomaly related to these signals propagates poleward, seemingly at low speeds (~0.08 m s-1). A temperate (or transitional) mode, which includes the coastal areas along the California Current System, also shows the 5-year signal plus a decadal-scale component (periods between 10-17 years). Finally, a subarctic mode includes the coastal areas along the Gulf of Alaska and is dominated by the interdecadal variability that is characterized by the Pacific Decadal Oscillation