Figure 15: Monthly EBR from March
2019 to December 2021. Note that ΔHS were calculated over a 15-m depth
except for November and December 2020 and 2021, for which it was
calculated for an h of 30-m and 44-m depths respectively.
Some uncertainties lie in the evaluation of ΔHS .
The monthly EBR was calculated using a ΔHS for
depths of 0−15 m, 0−30 m or 0−44 m, which correspond to the average
depths of the thermocline for January to October, November and December,
respectively. The water between the surface and these depths represent
good approximations of heat storage in the water column. This is because
the thermal mixing is spatially constrained by the thermocline. However,
there is uncertainty in estimating these thermocline depths, which may
lead to errors in the evaluation of ΔHS .
Note that for 2019, there were no data for depths below 15 m. When we
calculated ΔHS for a 30-m and a 44-m depth, the
EBR for November and December 2020 was 101% and 138% respectively.
This was less that the 150% and 440% calculated for the water between
the surface and 15-m depth.