The anomaly for a given location and day is defined as the difference between its temperature and its climatological value for this place on this day of the year. The climatological value isthe long-term representative value and is computed for every point in a grid of 0.125x0.125 degree (approximately 14 x 11 km) and for every day of the year from the histograms of the data collected from 1982 to 2019. The SST data used to compute the climatology is distributed by CMEMS (product SST_MED_SST_L4_NRT_OBSERVATIONS_010_004)

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Distribution of the positive anomalies.

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Distribution of the positive anomalies.

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Distribution of the positive anomalies.

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Distribution of the positive anomalies.

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Distribution of the positive anomalies.

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In a given place, temperatures above the 90^th percentile are expected, accordingly 1982-2019 measures, only 1 of every 10 days.

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Distribution of the differences above 90 percentile.

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Distribution of the differences above 90 percentile.

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Distribution of the differences above 90 percentile.

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Distribution of the differences above 90 percentile.

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Distribution of the differences above 90 percentile.

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Heat spike is the temperature anomaly when the temperature exceds the 90^th percentile.

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Distribution of heat spike

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Distribution of heat spike

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Distribution of heat spike

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Distribution of heat spike

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Distribution of heat spike

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Mean intensity of the Marine Heat Waves. The mean intensity is defined as the mean difference between the temperature and the climatologic during the warm event.

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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The following plots show the maximum category of the marine heat wave intesity during the warm event. The definition has been adopted according to [Hobday et al 2018] in terms on multiples of the value represented by the local difference between the climatological mean and the climatological 90^th percentile (threshold)

• Category 1 (moderate): Temperature anomaly of magnitude between 1 and 2 times of the threshold
• Category 2 (strong): Temperature anomaly of magnitude between 2 and 3 times of the threshold
• Category 3 (severe): Temperature anomaly of magnitude between 3 and 4 times of the threshold
• Category 4 (extreme): Temperature anomaly of magnitude above 4 times of the threshold

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Distribution of marine heat waves

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Number of days having marine heatwaves in the current year

Number marine heatwaves events in the current year

Maximum marine heatwaves category attained in the current year