Analysis Of Antarctic Sea Ice Variations From 2011 To 2018

Sea ice is an important indicator of the polar climate change.As the interface between the atmosphere and the ocean,it hinders the exchange of heat and solar radiation,and keeps the balance of radiation and energy exchange of ocean.Antarctic sea ice is an important part of global sea ice and profoundly affects global climate change.However,the changes in the Antarctic sea ice area and thickness have remained unknown for the past decade.In order to quantitatively assess the changes in Antarctic sea ice in the past decade,it is urgent to develop an Antarctic sea ice area and thickness data set and analyze its temporal and spatial changes.In this paper,the sea ice intensity data of the US Snow and Ice Center in 2011-2018 was used for area retrieval,and the SSMIS passive microwave data was used for the Antarctic snow depth retrieval.With the help of snow depth data,CS-2 data was used for the sea ice thickness retrieval by the hydrostatic equilibrium algorithm.Then,the change of the Antarctic sea ice in area and thickness can be known.In addition,this paper uses the ocean surface temperature data provided by the NOAA Earth System Research Laboratory and the ERA-Interim surface net solar radiation data provided by the European Mesoscale Climate Forecast Center to analyze the interrelationship between climate elements and sea ice changes.The results show that from 2011 to 2018,whether the sea ice area or the sea ice thickness of the Antarctic is declining.The sea ice area reduction trend is about0.1517×106km2/a and the sea ice thickness reduction trend is about0.021 m/a.In the seasonal changes,the sea ice area in the four seasons showed a decreasing trend,with the spring decreasing trend being the largest and the summer decreasing trend being the smallest,which was-0.251×106km2/a and-0.1107×106km2/a,respectively.The sea ice thickness in all four seasons showed a decreasing trend,with the summer decreasing trend being the largest and the winter trend being the smallest,the decreasing trend is-0.03m/a and-0.009m/a,respectively.In the region,the sea ice area of the Pacific Ocean,Ross Sea and Bellingshausen/amundsen Sea show a decreasing trend,while Ross Sea and the Indian Ocean show an increasing trend.In addition to the increasing trend of sea ice thickness in the Indian Ocean,the sea ice in other sea areas showed a decreasing trend,among which the Ross Sea(-0.053m/a)had the largest decreasing trend,and the Bellingshausen/amundsen Sea(-0.0008m/a)has the smallest decreasing trend.The change in sea surface temperature and surface net solar radiation is opposite to the change in sea ice,showing a trend of increased volatility.Among them,the increase trend of sea surface temperature is0.0138 ?/a,and the increase trend of surface net solar radiation is 0.0643W/m2/a.Since the thickness of sea ice is affected by ice for one year,in order to better analyze the relationship between sea ice thickness and climatic factors,many years of ice were used in the study to analyze the influence of climatic factors on sea ice thickness.Sea surface temperature and whether sea ice area or many years of ice thickness showed good negative correlation.Among them,the correlation coefficient between sea surface temperature and Antarctic sea ice area reached-0.979:the correlation coefficient between sea ice area and sea surface temperature of the Ross Sea in the five seas was the highest,and the lowest in the Bellingshausen Sea,which the correlation coefficient was-0.974 and-0.907.The correlation coefficient between ice and sea surface temperature in Antarctica is-0.867.The correlation coefficient between the ice thickness and sea surface temperature of Weddell Sea in the five seas is the highest,and the Western Pacific is the lowest,which is-0.838 and-0.753,respectively.