A sea surface temperature product for monitoring marine heatwaves in the northeast Pacific / by Andrea Hilborn, Lu Guan, Di Wan and Angelica Peña.: Fs97-18/394E-PDF

"There is an urgent need to monitor marine heatwaves. Their frequency, extent and magnitude are expected to increase with climate change, negatively impacting marine ecosystems. This report describes acquisition and processing of Optimum Interpolation Sea Surface Temperature, a gap-filled sea-surface temperature dataset at 0.25° spatial resolution, for Marine Heatwave monitoring in the Northeast Pacific. First, to assess the accuracy of this dataset in the Northeast Pacific and the Canadian Pacific Exclusive Economic Zone, its values were compared to observed ocean temperatures measured by buoys maintained by Environment and Climate Change Canada and Fisheries and Oceans Canada. The sea-surface temperature and buoy temperature data sources had good agreement, with the Optimum Interpolation Sea Surface Temperature dataset having an overall cool bias of -0.13 ± 0.44°C, particularly during the summer months. Second, 30-year Optimum Interpolation Sea Surface Temperature climatologies, anomalies, and Marine Heatwave maps were produced for weekly monitoring of Marine Heatwave extent in the Northeast Pacific. Daily statistics showing spatial coverage of the Canadian Pacific Exclusive Economic Zone and Federal Marine Bioregions were also produced. Finally, future improvements and further data sources and monitoring work are detailed. The information provided in this report, along with the code in the R programming language, was made available online and continues to update weekly"--Abstract, page iv.

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