Decadal Variation Of Inter-annual Relationship Between Arctic Sea Ice And Its Atmospheric Pattern

This paper analyzes ice-melting amount of sea ice at the Arctic and decadal variation of its inter-annual relationship with atmospheric variables by using Hadley sea ice concentration data and NCEP/NCAR reanalysis data. The following conclusions are mainly drawn:(1) Arctic sea ice has significant decadal variation and obviously locality. Average ice-melting amount and variance of sea ice of East Siberian Sea and Beaufort Sea increases, while ice-melting amount and variability of sea ice at east ocean of Greenland all decreases. Empirical orthogonal function(EOF) analysis was made on ice-melting amount of Arctic sea ice within 3 different climate periods; both modalities have significant decadal variation within the 3 different climate periods, increasing of ice-melting amount of sea ice of East Siberian Sea is correlated to decadal variation of the first modality of EOF, while the second modality of EOF causes decadal melting of sea ice of Beaufort Sea significantly.(2) The corresponding general atmospheric circulation also turned up significant decadal variation, their decadal relationship with AO/NAO also has decadal transition, the second modality of ice-melting amount has closer decadal relationship with AO, correlation coefficient between the second modality and AO from 1960 to 1990 is just 0.186, but correlation coefficient from 1980 to 2010 rose to 0.367.(3) Inter-annual relationship between the ice-melting amounts of sea ice of the whole Arctic Ocean and AO also appeared to decadal strengthen,especially the inter-annual relationship between the ice-melting amounts of sea ice in East Siberia region and AO appeared to decadal strengthen, correlation of the both form 1980 to 2010 had reached more than 0.4. While correlation coefficient of ice-melting amounts of sea ice of Beaufort Sea and AO from 1960 to 1990 reached up to -0.488, but it decreased to 0.161 after 1980.However, AO has no significant decadal variation. It is Beaufort high-pressure that causes decadal variation of inter-annual relationship between ice-melting amount of sea ice at the North Pole and its atmospheric variables, their decadal weaken make transportation of sea ice from Pole Region to East Siberia Sea and Beaufort Sea decreased, resulting reduction of sea ice in the two regions,thus causes inter-annual relationship between AO and sea ice at the Arctic to have decadal transition.(4) Each sea of Arctic has significant decadal variation and obviously locality.There are three most important seas. They are Barents Sea, East Siberian Sea and Beaufort Sea. 1960 to 1980 and 1990 to 2010 have significant decadal variation, Sea ice of Barents Sea do not have significant decadal variation with temperature at 1960 to 1980,but have significant decadal variation with temperature at 1990 to 2010 .The weaken of Barents high have important influence on sea ice at East Siberian Sea and Beaufort Sea.