California Current Ecosystem LTER

CCE Biological and Physical Water Column Properties - Annual & Cruise Averages

Title
Cruise measurements (temperature, salinity, density, chlorophyll, C14, phosphate, silicate, nitrate, nitrite) collected from CTD casts aboard CalCOFI cruises in the California Current, and averaged annually and by cruise, from 1984 - 2016 (updated periodically).

Abstract
Water column bottle sample data averaged across up to 46 standard stations (inshore and offshore) per cruise and then averaged over a varying number of cruises in any one year to give an annual average.

Keywords
measurements, temperature, chlorophyll, nitrate, CTD, hydrography, water column

Projects
California Current Ecosystem LTER
CalCOFI - Scripps Institution of Oceanography

Creators
Goericke, Ralf (rgoericke@ucsd.edu)

Contact
CCE LTER Information Manager (ccelter-im@ucsd.edu)

General Methods Annual averages of properties were calculated stepwise: First mixed layer (ML) averages of properties were calculated for each station by averaging property values for all samples collected in the ML. CalCOFI cruise averages were calculated by averaging property values across all 66 standard CalCOFI stations (http://www.calcofi.org/field-work/station-info.html). Annual averages were calculated by averaging properties of the winter, spring, summer and fall CalCOFI cruises for each year. The mixed layer depth is calculated using a density criterion and set either to 12 m or to the half-way point between the two sampling depths where the sigma-theta gradient first reaches values larger than 0.002 per m, whichever is larger. The nitracline depth is defined as the depth where concentrations of nitrate reach values of 1 μM, calculated from measurements at discrete depths using linear interpolation.
CCE LTER / CalCOFI Methods Manual http://cce.lternet.edu/data/methods-manual
Plots CalCOFI Mixed Layer Properties Plots for 1984 - 2016 application/zip 4.76MB

Available Data

Type Name Description Info
Annual Averages Data table containing annual averages and anomalies from CalCOFI cruises in the California Current. Rows: 33
Columns: 25
View / Download
Cruise averages Data table containing cruise averages and anomalies from CalCOFI cruise in the California Current. Rows: 146
Columns: 25
View / Download