Table 1 Metrics to characterize marine heatwaves (MHWs) for each year at three sites. Number of MHWs, total duration of all MHWs in a year, maximum observed anomaly above the threshold during a MHW, and the sum of daily intensity anomalies (°C days) follow Hobday et al. (2016). Also provided are the number of anomalous days exceeding the 90th percentile threshold value but not meeting the criteria for inclusion as part of a MHW (i.e. non-MHW days) and the range of MHW duration
Site | No. of | Total duration | Non-MHW | MHW | Max. deviation | ||
|---|---|---|---|---|---|---|---|
Year | MHWs | MHWs (d) | anomalies (d) | range (d) | MHW (°C) | °C days | |
ESNERR | 2013 | 2 | 11 | 17 | 5–6 | 1.1 | 5.4 |
2014 | 6 | 121 | 37 | 10–41 | 3.0 | 122.1 | |
2015 | 10 | 206 | 26 | 8–55 | 3.1 | 219.8 | |
2016 | 9 | 105 | 15 | 5–21 | 1.5 | 60.7 | |
2017 | 3 | 45 | 17 | 9–25 | 1.7 | 25.8 | |
2018 | 6 | 113 | 26 | 6–39 | 2.9 | 107.5 | |
HMS | 2013 | 0 | 0 | 1 | 0 | 0.2 | 0.0 |
2014 | 5 | 114 | 32 | 16–30 | 2.4 | 121.7 | |
2015 | 6 | 151 | 22 | 5–58 | 2.5 | 143.2 | |
2016 | 3 | 18 | 70 | 5–8 | 0.9 | 7.4 | |
2017 | 2 | 30 | 18 | 8–22 | 2.8 | 33.4 | |
2018 | 5 | 61 | 25 | 6–19 | 2.2 | 42.7 | |
TRNERR | 2013 | 3 | 25 | 32 | 5–14 | 1.6 | 17.9 |
2014 | 11 | 233 | 26 | 5–78 | 4.1 | 280.9 | |
2015 | 8 | 259 | 11 | 5–109 | 5.2 | 463.8 | |
2016 | 9 | 145 | 30 | 5–37 | 5.1 | 209.1 | |
2017 | 6 | 54 | 48 | 5–16 | 5.2 | 58.3 | |
2018 | 12 | 177 | 20 | 5–32 | 3.8 | 250.0 |