A contribution to the study of action centres in the North Atlantic
A contribution to the study of action centres in the North Atlantic
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对北大西洋行动中心研究的贡献
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
H. Sahsamanoglou
中科院分区：
文献类型：
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作者：
H. Sahsamanoglou
北大西洋高压在研究期间（1873-1980年）开始到本世纪初出现明显减弱。从那时到1930年，它的中心压力不断增加。从这一时期开始到1914年，北大西洋高压有明显的加强趋势，同时也有向西移动的趋势。从1915年到1963年，它呈现出减弱的趋势和东移的趋势。北大西洋低压的中心气压没有明显的变化趋势，但有向西移动的趋势。一般来说，这两个作用中心的压力之间存在负相关关系，而这两个中心的纬度位置之间存在正相关关系。在两个活动中心之间产生的气压梯度的纬向分量，在西风带频率低的时期出现低值，而在西风带频率较高的时期出现高值。
The North Atlantic High appears notably weakened from the beginning of the examined period (1873–1980) until the beginning of this century. From then until 1930, it exhibits an increased central pressure. From the beginning of the period until 1914, the North Atlantic High exhibits a significant trend of intensification and at the same time a trend of displacement to the west. From 1915 until 1963 it exhibits a trend of weakening and a trend of eastward displacement. The North Atlantic Low has not exhibited a significant trend of its central pressure, but it has shown a small trend of displacement to the west. There is generally a negative correlation between the pressures of these two centres of action and a positive correlation between latitudinal position of the centres. The meridional component of the pressure gradient created between the two action centres, appears to have low values during epochs of low frequency of westerlies and high values when the westerlies are more frequent.