波弗特海海冰范围退缩的时空变化研究

Based on the daily and sea scale data of the American Snow and Snow Data Center (NSIDC), the sea ice concentration was 15% as the threshold to determine the sea ice edge line, and the sea ice margin line in the Beaufort sea area was extracted, The sea ice concentration, sea ice range and sea ice area in the Beaufort Sea were calculated, and the spatial and temporal changes of the edgeline of the Beverly Sea were analyzed by the interannual and seasonal variation of the sea ice range and the sea ice boundary line Characteristics and trends. The experimental results show that the sea ice concentration, sea ice range and sea ice area in the Beaufort Sea from 1978 to 2015 are consistent and the trend is decreasing. Over the past 37 years, the sea ice concentration has decreased by an average of about 0.3% per year, and the sea ice range has decreased by an average of 3235 km2 per year. The average area of sea ice has been reduced by 5084 km2 per year. There was no obvious decrease trend of sea ice concentration in 1979 ~ 1996, and the trend of decreasing from 1996 to 2015 was obvious. The range of sea ice in the Beaufort Sea Sea is generally the smallest in September and is maintained at the maximum (full ice coverage) from November to May; the sea ice area is generally the smallest in September, or in December or 1 Month to reach the maximum. The minimum time of sea ice range has a tendency to delay, and the coverage of the whole ice has a tendency to start at a relatively late time, and the ending time is getting older and the duration is getting shorter and the average duration is 212 days.