| As a major component of marine systems, sea ice affect on the global climate system cannot be underestimated. It is the intermediary energy between the ocean and atmosphere, interact to make time and space on the ocean and atmosphere through the heat and move. Hudson Bay sea ice obvious regional, seasonal, inter-annual variation difference. Between 1971 to 2011, the total area of Hudson Bay sea ice and ice concentrations dropped significantly, reducing of the number of seasonal ice, and multi-year ice no longer exist. In this same time, in the summer sea ice increasing the ablation rate. Research on sea ice for the global climate change, ecosystems and human activities is significant. Based on sea ice and atmospheric temperature data from 1971 to 2011. In this paper, five aspects were analyzed. As follows:general features, sea ice concentration variation, seasonal ice and multi-year ice, summer sea ice as well as the impact of temperature on the ice conditions. The results show:(1)Hudson Bay sea ice distribution is uneven, the overall Sea ice concentrations from south to north tends to increase.If the Hundson bay is divided into four areas, Sea ice in northern and eastern waters of the inter annual variability of the most obvious, especially in the northern edge of the waters of the bay. The minimum rate of change of central waters, sea ice coverage in the closest average.In addition, we can also see:sea ice concentration variation is mainly concentrated in the area of edge.Overall, the change of northeast is far greater than the southwest. Hudson Bay ice conditions affect change in the overall situation of the district's in the waters:the total amount of sea ice change occurs mainly in the eastern and northern waters, sea ice trends southwest area is weak.(2)Sea ice concentrations in each sorted in descending order:winter, fall, spring, summer. In all waters, in the middle of the sea ice in the four seasons the most obvious changes. Trends each intensity of sea ice is consistent:Winter ice concentrations largest and most widely distributed range of sea ice, and in the summer sea ice minimum density, small sea ice distribution. Ice concentrations reached a maximum in March, August appears minimum.(3) The seasonal and perennial sea ice record,1981 to 2011, revealed stronger and more statistically significant trends. The perennial change of sea ice aggravated,especially in northern waters. The minimum sea ice concentration distinguished from region is eastern part,the maximum one is central area.The value of northern waters was closest to the average of the Hundson bay. From 1981 to 2011, the fastest rate of decrease in the northern waters, the rate of northwest and central waters are almost flat.(4) Hudson Bay summer sea ice concentrations in order to reduce the overall trend, R value of 0.18.The biggest change was occur in northern and western waters,the smallest value was in eastern area. The slope of every month were similar,and they are all in line with the overall trend of the range.After September the weather turns cold, spring and summer sea ice extent by the reduction becomes an increasing trend, ice concentrations are becoming larger.(5) The average magnitude of the temporal trend for all 36 locations studied is 0.50 days per year for earlier breakup,0.46 days per year for the later freeze-up, and 0.91 days per year for longer ice free period. Of the 36 points,12 points for the breakup period,30 points for the freeze-up period and 22 points for the ice free season have accelerating temporal trends during the past decade. |
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