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The recent decline in the Arctic sea ice has coincided with more cold winters in Eurasia.It has been hypothesized that the Arctic sea ice loss is causing more mid-latitude cold extremes and cold winters,yet there is lack of consensus in modeling studies on the impact of Arctic sea ice loss.Here we conducted modeling experiments with Community Atmosphere Model Version 5(CAM5) to investigate the sensitivity and linearity of Eurasian winter temperature response to the Atlantic sector and Pacific sector of the Arctic sea ice loss.Our experiments indicate that the Arctic sea ice reduction can significantly affect the atmospheric circulation by strengthening the Siberian High,exciting the stationary Rossby wave train,and weakening the polar jet stream,which in turn induce the cooling in Eurasia.The temperature decreases by more than 1°C in response to the ice loss in the Atlantic sector and the cooling is less and more shifts southward in response to the ice loss in the Pacific sector.More interestingly,sea ice loss in the Atlantic and Pacific sectors together barely induces cold temperatures in Eurasia,suggesting the nonlinearity of the atmospheric response to the Arctic sea ice loss.  相似文献
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为了检验一个准全球的海洋环流模式中热带太平洋对风应力变化的响应,使用NCEP月平均再分析资料计算的强迫场强迫该模式进行控制试验,在(10.5°S~9.5°N,159.75°E~110.25°W)的区域增大或减小风应力拖曳系数进行敏感性试验,并把试验结果与同时段的SODA资料进行分析比较.该模式基本能模拟出海洋环流的基本气候态,但是对一些细节描述还不够准确.试验结果表明,风应力减小时可以改善模式对热带东太平洋冷舌的模拟,而对次表层温度和流场的刻画能力较弱.增大风应力则对次表层温度和流场的模拟有所改善.通过对模式中热量收支的分析可知,平流过程、扩散过程对热带太平洋海表温度的变化起到了重要的作用;海表面热交换可以促使海温距平向相反的方向发展.垂直输送对赤道中东太平洋表层的降温起重要作用,抑制了次表层的增暖,水平平流过程则促进了赤道太平洋次表层的增暖.  相似文献
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Recent investigation suggests that volume transport through the Tsushima/Korea Strait often has double peaks during the summer to autumn period with decreasing transport in September. The satellite-observed wind changes from weak northwestward (across-strait) in summer to strong southwestward (along-strait) in early autumn (September) in the strait. Such a strong along-strait wind is related to tropical cyclones, which frequently pass through the East China Sea in September. The effect of the along-strait wind component on the transport variation is examined using a three-dimensional numerical model. The simulated volume transport through the Tsushima/Korea Strait shows realistic seasonal and intra-seasonal variations. According to sensitivity experiments on local winds, the transport variations in September are mainly generated by strong along-strait (southwestward) wind rather than weak across-strait wind. The strait transport responds to the along-strait wind (southeastward), which produces a sea level increase along the Korean coast, resulting in the geostrophic balance across the strait. The transport minimum through the Tsushima/Korea Strait in September can be determined by the combination of the across-strait geostrophic and along-strait ageostrophic balances. The Editor-in-Chief does not recommend the usage of the term “Japan/East Sea” in place of “Sea of Japan”.  相似文献
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本文利用多种观测资料、再分析资料及WRF(Weather Research and Forecasting Model)模式,对2017年12月23—25日发生于中国东部沿海入海加强的一个强暴发性气旋进行了研究,并探讨了海陆地形和热力差异对暴发性气旋发展的影响。该暴发性气旋的最大加深率为1.7Bergerons,其下垫面经历的“海洋-陆地-海洋”的复杂变化对其发展过程产生了显著影响。该气旋登陆朝鲜半岛时,气温降低,水平风速减小,上升运动增强,降水增加;而离开朝鲜半岛后,气温升高,上升运动减弱,降水减少。海陆差异的敏感性试验表明,陆地下垫面对气旋发展的动力作用主要是通过地面摩擦和地形抬升来实现的,而海洋对气旋发展的作用则主要表现在海表面热量和水汽传输方面。当气旋经过陆地时,由于陆地表面摩擦较大,气旋中心近地面水平风速减小。而较高的地形则会产生较强的上升运动,形成较强降水,促进类CISK(Conditional Instability of Second Kind)机制,使气旋加强。当气旋位于海面上时,冬季海面温度高于陆地,海洋向气旋输送更多的热量和水汽,从而更有利于气旋的发展。  相似文献
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