The co-occurrence of MHW characteristics and in situ sampling from CCE-CalCOFI Augmented Cruises in the California Current System,1983~2021

The intensity and duration of each MHW event and the anomalies of in situ nitracline and plankton abundance in the Southern California Current System (the region south of line 76.7; 29-36°N, 117-125°W) were calculated. In situ data are available from ~quarterly CalCOFI cruises. Data collected from 1983 onward were utilized, including nitrate, picoplankton and bacteria abundance, size-fractionated Chla concentration, vertically-integrated Chla, vertically-integrated primary production, phytoplankton taxon-specific pigments from High-Performance Liquid-Chromatography (HPLC) analysis, zooplankton displacement volume (ZDV), zooplankton taxon-specific abundance, and fish egg and larvae abundance.