The volume of Pacific Water flowing
northward in the Bering Strait is increasing, with an annual average of 0.7 ×106 m3 s-1 in
2001 and 1.2 ×106 m3 s-1 in
2014 (Woodgate, PiO, 2018), and the northward heat transport by the Pacific
Summer Water through the Bering Strait is also increasing (the purple line in
the figure below). This increase in the northward heat transport is thought to result in reduced sea ice in the Chukchi Sea, promoting solar heating. Therefore, the calculation of the cumulative
throughout the Chukchi Sea from May to September between 1999
and 2015 showed an increasing trend (the red line in the figure below).
Considering cooling by latent heat, in addition to heat
transport and solar heating by the northward current in the Bering Strait, the investigation
of the interannual variability of total heating in the Chukchi
Sea in summer showed a strong correlation with solar heating and northward
heat transport in the Bering Strait. These results suggest that in the years with
high northward heat transport in the Bering Strait, the heat transport is
further amplified by solar heating in the Chukchi Sea,
transporting more heat to the Arctic Ocean basin.
Cumulative solar heating, northward heat transport by the Bering
Strait, “latent heat + sensible heat + long wave heat release,” and interannual
variability in heat of fusion of sea water (1020J) throughout the Chukchi Sea from May to September between 1999
and 2015. Modified figure from Tsukada, Ueno et al. Polar Science (2018).