Cold air mass

Taiwan is currently enveloped in the cold air mass with temperatures continually dropping as expected .

目前台湾郑笼罩在冷气团当中，温度如预期的也一路下降。

Under this condition , there forms a sharp temperature contrast belt between the cold air mass of Meiyu region and the relative warm air mass of the north land .

在这种温度场下，由北部低层变性暖气团与梅雨区偏冷空气形成了明显的温度对比区，文中定义这个区域为梅雨赤道锋。

If the cold air mass is not so strong , its invasion into the center part of a wintertime tropical cyclone strengthens the tropical cyclones .

浅薄冷空气的入侵对热带气旋起加强作用，但强冷空气侵入热带气旋则容易使其减弱消亡。

After landfall , when vapor transportation is reduced and low troposphere is invaded by cold air mass , it normally results in inactive waves and intensity weakening .

当气旋登陆后，水汽输送被切断且冷空气从底层侵入造成对流稳定度增大，使得扰源受到衰减，波动不再活跃，气旋强度减弱。

But rapeseed planting is facing many risks in Hubei . Such as weather is changeable , cold and warm air mass change frequently . Fatal low temperature , flood , arid , and tornado often appeared , etc * Rapeseed is a very important technical crop in winter .

但是湖北省油菜种植面临着许多自然风险，例如气候多变、冷暖气团交替十分频繁，且常有低温、洪涝、干旱、龙卷风等灾害性天气出现。

The major controlling influence is the inflow of a cold , dry , air mass .

主要支配的影响是干冷气团之流入。