Multiyear? So what happened in 2016 and in 2017. The Atlantification of the Laptev took a break??
I remember well both springs. 2016 was warm everywhere, but the Laptev coast melting suffered a delay due to the fact that a lot of ice drift streamlines had been converging during winter/spring toward ESS and Laptev, and the transpolar had been disrupted that winter not inducing as much peel-off on the Laptev coasts, leading to a high Laptev ice volume.
In 2017 spring simply started a few weeks late especially in Eurasia due to the high snow cover volume and late thaw. The whole summer was relatively cold.
I bet the relentless reduction of ice in Laptev can be explained by atmospheric climate change without having to resort to the obscure hypotheses of Atlantic Water effects. Global warming effects on oceans is slow and often counterintuitive. Reserves for heat are enormous given the dimensions and the heat capacity. Characteristic times of change are of the order of hundred years.
Granted, it is more entertaining and novel-esque to focus the attention on impossible to verify heat sources and impossible to measure methane time-bombs. To each their own.
Troll is for someone flooding the forum with the same argument over and over, ignoring the contributions of the others members.
Multi year
does NOT mean it is monotonically worst year after year, but that it is a trend. The year 2012 was worst than the year 2007, the year 2016 was worst than the year 2012, and the year 2020 is worst than the year 2016. Perhaps 2021 will be even worst, perhaps not, who know. But only for you does a trend mean each year being monotonically and significantly worst than the preceding year.
And again, at some point which is now probably really not that far away, the trend will overwhelmed the Arctic and tip the Kara sea to a perenially open sea (and the Laptev and Chuckchi are next in line).
In your document, salinity is described as being in the range 22 to 32 PSU at
surface, reaching 33 to 34.5 PSU at one hundred meters (100 meters). Just read...
The temperature and salinity fields show large gradients between the mixing zones of river and sea water and the uniform thermohaline structure of the northern Laptev Sea. In the wintertime, due to a sharp decrease in runoff, increase in ice cover, and decrease in convection processes, the thermohaline structure is relatively homogenous. The water temperature varies from -1.4° in the eastern sea, up to -0.8° in the northwestern sea. The water salinity in the southwestern sea has values of 22-24 0/00, smoothly increasing northward and to the northwest up to 32-34 0/00. Figure 7 shows the vertical temperature and salinity profiles for the western, southeastern, and northern regions of the Laptev Sea in the summertime. In summer the southwestern upper 15 meter layer is warmed to a temperature of 5 ° - 7° . In the southeastern part, temperatures increase to 1° and remain about -1° in the northern areas. In winter a vertical temperature and salinity distribution in the shallow area is quite uniform, the salinity weakly increasing with depth and the temperature being within -0.5° - 1.9° C, depending on the region. In the deep northern Laptev Sea a temperature maximum is observed at a level of 100-400 m, the salinity dramatically increases from the surface to a 100 m level from 29 to 33-34.5 0/00 and changes little at greater depths.
This year, we are speaking of salinity significantly above 34 PSU, nearing 34.5 PSU if we trust MERCATOR, at surface, in winter, in Laptev. Not at a depth of 100 or 800 meters, at surface.
And you don't answer the question, why then the ice boundary is set northward of 81 - 82°N or something like this, from Svalbard to Severnaïa Zemlaïa, if this is just some direct consequence of huge inertia from the Spring heat wave over Siberia (and by the way why there is still probably some bottom melt ongoing there, to be exhaustive).
