Based on the retrieval data of sea ice concentration from the U.S. National Snow and Ice Data Center and ERA-Interim data from 1979 to 2020, this paper makes use of the ensemble empirical mode decomposition method to analyze the variations of the sea ice and atmospheric wind/pressure field during this period. The results are shown below. (1) The sea ice coverage area has shown a decreasing trend in the past 40 years, and the decreasing rate is about 1.4×103 km²/(10 a). Among them, the decreasing trend of the sea ice concentration in the Barents Sea and Kara Sea is the most significant. At the same time, the sea ice coverage area reaches a minimum in September (summer) and a maximum in March (winter). (2) The polar sea-level pressure field shows a decreasing trend in the center of the Arctic and an increasing trend outside the Arctic from 1979 to 2014, and its spatial distribution characteristics are similar to those of the positive phase of the Arctic Oscillation. At the same time, the surface wind blowing from the Atlantic Ocean to the Barents Sea has an increasing trend from 1979 to 2014. Considering the dragging effect of the surface wind field on the surface current and sea ice, it is speculated that the warm water from the Atlantic Ocean will increase in the Barents Sea, which may cause the sea ice to melt in the area.