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气旋(即低气压)过境会影响渔获量,早已被人们所知,国内外有关文献中也曾有过记载和描述。然而,对气旋过境引起的海况变化及其对鱼类行动的影响尚分析得不多。本文就春夏之交在长江口一带出海的气旋对长江口渔场(30°N～32°30′N,125°E 以西海区)海况环境的影响及其与机轮底拖网渔获量变动的关系作一分析探讨。限于资料的不足,和以往研究较少,因而本文所作的讨论只能是初步的。一、春夏季长江口一带气旋活动概况:气旋是一种低空气辐合的现象。在北半球,当四周的空气向低压中心辐合时,在地球柯氏力的作用下,将形成一个逆时针方向旋
It has long been known that the cyclone (ie, low-pressure) transit will affect catches, and there have also been records and descriptions in the relevant literature both at home and abroad. However, the changes in the sea conditions caused by cyclone transit and their impact on fish operations are still far from being analyzed. In this paper, the influence of the cyclone over the Yangtze River estuary at the beginning of spring and summer on the sea-environment of the Changjiang estuary fishery (30 ° N ~ 32 ° 30’N, 125 ° E west sea area) To make an analysis of the relationship. Limited to the lack of information, and less research in the past, so the discussion in this article can only be preliminary. First, the spring and summer cyclone activity profile of the Yangtze River estuary: cyclone is a low-air convergence phenomenon. In the northern hemisphere, when the surrounding air converges to the low pressure center, under the action of Earth Coriolis force, a counterclockwise rotation