The global atmospheric circulation on moist isentropes.
The global atmospheric circulation on moist isentropes.
复制标题
全球大气环流湿等熵。
DOI：
10.1126/science.1159649
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Pauluis O
中科院分区：
文献类型：
--
作者：
Pauluis O
全球大气环流通过向极地流动的高能和熵流以及向赤道流动的具有较低能量和熵含量的空气，将能量从赤道地区输送到高纬度地区。由于其湍流性质，这种环流只能在某种平均意义上进行描述。在这里，我们表明，在潮湿等熵上平均时，循环的总质量传输是在干燥等熵上平均时的两倍。潮湿等熵上的额外质量传输对应于地球表面附近温暖潮湿空气向极地流动，该空气上升到中纬度地区的对流层上层，并占极地地区对流层上层空气的一半。
The global atmospheric circulation transports energy from the equatorial regions to higher latitudes through a poleward flow of high-energy and -entropy parcels and an equatorward flow of air with lower energy and entropy content. Because of its turbulent nature, this circulation can only be described in some averaged sense. Here, we show that the total mass transport by the circulation is twice as large when averaged on moist isentropes than when averaged on dry isentropes. The additional mass transport on moist isentropes corresponds to a poleward flow of warm moist air near Earth's surface that rises into the upper troposphere within mid-latitudes and accounts for up to half of the air in the upper troposphere in polar regions.