Heat Insulation and Dissipation Processes in Nordic Seas in the Summer
Tóm tắt
The Nordic Seas have a significant impact on the climate system. Here 23-day air-sea heat fluxes were analyzed from an in situ air-sea coupled buoy deployed in the Lofoten Basin from 5 August 2012 to 27 August 2012. The buoy captured two stages of strong south and north winds. The observations indicate that warm and wet air transported by the south wind can lead to decreased sensible and latent heat fluxes and net longwave radiation. The total oceanic heat loss was 50–60 W m−2. Thus, this stage was called the heat insulation process. By contrast, the heat dissipation process occurred with the north wind condition during advection of the cold and dry air. During this process, sensible and latent heat fluxes and net longwave radiation notably increased. The total oceanic heat loss during the heat dissipation process reached 240 W m−2, which was four-fold greater than that in the heat insulation process. Given that the heat insulation process is dominant in summertime, the ocean lost minimal heat but absorbed strong solar energy. Thus, a large quantity of energy was stored in the ocean. Heat was transported to the Arctic Ocean and accelerated Arctic warming. The heat dissipation process is dominant in autumn and winter when the ocean releases considerably more energy. The two processes revealed in this paper can be applied to warm-water areas in high latitudes.
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