Semi-automatic determination of the Azores Current axis using satellite altimetry: Application to the study of the current variability during 1995–2006

Satellite altimetry has been widely used to study the variability of the ocean currents such as the Azores Current (AzC) in the North Atlantic. Most analyses are performed over the region that encloses the current, thus being somehow affected by other oceanographic signals, e.g., eddies. In this study, a new approach for extracting the axis of a zonal current solely based on satellite altimetry is presented. This is a semi-automatic procedure that searches for the maximum values of the gradient of absolute dynamic topography (ADT), using the geostrophic velocity as auxiliary information. The advantage of this approach is to allow the analyses to be performed over a buffer centered on the current axis instead of using a wider region. It is here applied to the AzC for the period June 1995–October 2006.     

论东北沦陷时期的爱国抗日文化运动

日本帝国主义侵占中国东北后，积极推行殖民主义的文化侵略政策，企图以此达到永久侵占中国东北的目的。东北人民在中国共产党的领导下积极开展爱国抗日文化运动，通过建立抗日文学团体；打入敌伪报社内部：东北作家群在关内的抗日作品创作；抗日联军的抗日文化活动等方式有力的回击了日本的文化侵略，成为东北抗战历史上光辉的一页。