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By using a 2-layer AGCM designed by Institute of Atmospheric Physics,Chinese Academy ofSciences.this paper investigates influences of thickness and extent variations in Arctic sea ice onthe atmosphere circulation,particularly on climate variations in East Asia.The simulation resuhshave indicated that sea ice thickness variation in the Arctic exhibits significant influences onsimulation results,particularly on East Asian monsoon.A nearly reasonable distribution of sea icethickness in the model leads directly to stronger winter and summer monsoon over East Asia.andimproves the model’s simulation results for Siberia high and Icelandic low in winter.On the otherhand,sea ice thickness variation can excite a teleconnection wave train across Asian Continent,andin low latitudes,the wave propagates from the western Pacific across the equator to the easternPacific.In addition,the variation of sea ice thickness also influences summer convective activitiesover the low latitudes including South China Sea and around the Philippines.Effects of winter sea ice extents in the Barents Sea on atmospheric circulation in the followingspring and summer are also significant.The simulation result shows that when winter sea iceextent in the target region is larger (smaller) than normal.(1)in the following spring (averagedfrom April to June).positive (negative) SLP anomalies occupy the northern central Pacific.whichleads directly to weakened (deepened)Aleutian low.and further favors the light (heavy) sea icecondition in the Bering Sea:(2)in the following summer,thermal depression in Asian Continent isdeepened (weakened).and the subtropical high in the northwestern Pacific shifts northward(southward) from its normal position and to be strengthened (weakened).
By using a 2-layer AGCM designed by Institute of Atmospheric Physics, Chinese Academy of Sciences. This paper investigator influences of thickness and extent variations in Arctic sea ice on the atmosphere, especially on climate variations in East Asia. The simulation resuhshave indicated that sea ice thickness variation in the Arctic exhibits significant influences on simulation results, particularly on East Asian monsoon. A near reasonable distribution of sea icethickness in the model leads directly to stronger winter and summer monsoon over East Asia. and impressions of the model’s simulation results for Siberia high and Icelandic low in winter.On the otherhand, sea ice thickness variation can excite a teleconnection wave train across Asian Continent, andin low latitudes, the wave propagates from the western Pacific across the equator to the eastern Pacific.In addition, the variation of sea ice thickness also influences summer convective activitiesover the low latitudes including South Chi Effects of winter sea ice extents in the Barents Sea on atmospheric circulation in the followingspring and summer are also significant. The simulation result shows that when winter sea ice extents in the target region is larger (smaller) than normal. (1) in the following spring (averagedfrom April to June) .positive (negative) SLP anomalies occupy the northern central Pacific.whichleads directly to weakened (deepened) Aleutian low. And further favors the light (heavy) sea icecondition in the Bering Sea (2) in the following summer, thermal depression in Asian Continent isdeepened (weakened) .and the subtropical high in the northwestern Pacific shifts northward (southward) from its normal position and to be strengthened (weakened).