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.本研究计算了南加州海流系统（即76.7号线以南区域，北纬29°-36°、西经117°-125°）内每一次海洋热浪（Marine Heatwave, MHW）事件的强度与持续时长，以及原位硝酸盐跃层和浮游生物丰度的异常值。该数据集的原位数据来自约每季度一次的加州合作海洋渔业调查（California Cooperative Oceanic Fisheries Investigations, CalCOFI）航次。本研究使用了1983年以来收集的多类数据，涵盖硝酸盐浓度、超微型浮游生物与细菌丰度、分粒径叶绿素a（Chlorophyll a, Chla）浓度、垂直积分叶绿素a、垂直积分初级生产力、经高效液相色谱（HPLC）分析得到的浮游植物类群特异性色素、浮游动物置换体积（ZDV）、浮游动物类群特异性丰度，以及鱼卵和仔鱼丰度。