中央气象台首(shǒu )席预(yù )报(bào )员 方(fāng )翀:在春季(jì )就是说出(chū )现这种忽冷(lěng )忽热的(de )天气(qì )现象的话(huà ),应该来(lái )说还是(shì )比较常见(jiàn )的。在冬天的话(huà ),我国(guó )大(dà )部(bù )地区(qū )都是(shì )受到这种(zhǒng )冷高压(yā ),或者说这种冷(lěng )气(qì )团(tuán )的这么(me )一个控制或(huò )者影响,暖(nuǎn )气团(tuán )相(xiàng )对来(lái )说(shuō )势力比较弱(ruò )小,这(zhè )样(yàng )的话冷暖气流交汇并不(bú )是(shì )很强,相(xiàng )对来说(shuō )气温幅度变化(huà )并不是太大。春季(jì )正处于这么(me )一个冷(lěng )气团和(hé )暖气团(tuán )此消(xiāo )彼长(zhǎng )的季(jì )节。当冷(lěng )气(qì )团势力(lì )积聚(jù )到(dào )一定程度,并且大举南(nán )下的时候,这(zhè )个气(qì )温就会(huì )大幅(fú )度(dù )下降。但是(shì )当(dāng )它(tā )势力(lì )衰弱,而(ér )暖气团开始(shǐ )加(jiā )强的时(shí )候,气(qì )温又会(huì )大幅度上升,所以(yǐ )就出现(xiàn )了这种忽冷忽热(rè )的现象。
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