Ten years of hydrographic variability off Central California during the upwelling season
Baltz, Kenneth A
Collins, Curtis A.
Schwing, Franklin B.
MetadataShow full item record
Analysis of mean conditions and variability during the upwelling season off central California was performed on data sets of buoy and shoreline surface measurements and CTD data from ten annual NMFS surveys (1987-1996). Climatologies of the surface conditions (alongshore wind, SST, SSS) revealed that the height of the upwelling season occurred during May and June. Variability in the surface conditions was high both inter-annually and inter- seasonally with maximum equatorward wind, lowest SST, and highest SSS during the months of May and June. Ten year climatologies of hydrographic conditions from CTD data (depth and salinity on density anomaly surfaces, and temperature, salinity, density at discrete depths) indicated complex circulation patterns and water mass properties. The nearshore region contained relatively dense, upwelled water and isopycnal gradients conformed to local bathymetry. A robust upwelling filament off Pt. Reyes and three anticyclonic eddy-like features west of the shelf break appeared in the climatologies. EOF (Empirical Orthogonal Function) analysis of the subsurface variability confirmed the presence of the prominent features that appeared in the climatologies. The geophysical signals of the first three EOF-amplitude pairs represent a cross-shore mean upwelling pattern, an alongshore pattern caused by spatial variations in wind and gradients of water mass characteristics, and a filament-eddy resolving pattern, respectively
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Wind Stress Curl and Ocean Conditions in the Northeast Pacific: A Mechanism for Ocean Climate Change Green, Phaedra; Schwing, Frank; Murphree, Tom (2001);Wind stress and wind stress curl strongly shape upper ocean conditions in the North Pacific on a full range of time scales. The NCEP reanalysis surface daily winds have been processed to define climatologies and monthly ...
Morales, Juan Aguilar. (Monterey, California. Naval Postgraduate School, 2003-09);Moored current meters were used to describe currents over the continental slope off Monterey Bay, California, from March 1998 to March 2003. The water depth at this location was 1800 m and current observations included of ...
The Modulation of the Subtropical and Extratropical Atmosphere in the Pacific Basin in Response to the Madden-Julian Oscillation Moore, Richard W.; Martius, Olivia; Spengler, Thomas (2010-07);The 40-yr ECMWF Re-Analysis (ERA-40) data are combined with a number of novel climatologies to conduct a comprehensive examination of the response of the subtropical and extratropical atmosphere over the Pacific basin ...