Long-term glider observations of temperature, salinity, and dissolved oxygen in the California Current System

Sustained observations of the central and southern California Current System have been made by the California Underwater Glider Network (CUGN) since 2006. Glider observations along three across-shore transects, line 66.7, 80.0, and 90.0, have allowed for calculations of temperature and salinity anomalies since 2006, including interannual variations in ocean temperature and salinity. A high salinity extreme was observed from 2017-2019 while high temperatures were observed from 2014-2019. Subsurface salinity and temperature anomalies are observed to propagate offshore, evidence of subthermocline eddies that are important for the transport of coastal water masses. A new addition to the sustained observing system of CUGN is the regular measurement of dissolved oxygen. Calibrated dissolved oxygen observations since December 2016 have been used to analyze the seasonal cycle. CUGN now has the ability to monitor interannual variations in dissolved oxygen in the California Current System.