Sun-stirred Kraken Mare: Circulation in Titan’s seas induced by solar heating and methane precipitation

Sun-stirred Kraken Mare: Circulation in Titan’s seas induced by solar heating and methane precipitation
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太阳搅动的克拉肯海:由太阳加热和甲烷沉淀引起的泰坦海洋环流

DOI:
10.1016/j.icarus.2015.08.033
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发表时间:
2015
期刊:
影响因子:
3.2
通讯作者:
R. Lorenz
R. Lorenz
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Tokano;R. Lorenz

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土卫六的海洋密度驱动的环流迫使太阳加热和甲烷蒸发/降水的海洋环流模式进行了模拟。如果海水对阳光是透明的,太阳能加热可以在海面附近诱发逆时针涡旋,在海底附近诱发顺时针涡旋。涡旋在径向对称压力梯度力和科里奥利力之间处于地转平衡。相反,如果海水浑浊,大部分阳光在海面附近被吸收,海洋在温暖的季节会分层,环流仍然很弱。降水导致海洋成分分层,使海洋表面温度低于海洋内部温度,而不会引起对流翻转。不均匀的降水也可以产生甲烷摩尔分数和密度的纬度梯度,这驱动了赤道翻转与赤道电流附近的海面和极地电流附近的海底。然而,涡旋比纬向翻转更普遍。
Density-driven circulation in Titan’s seas forced by solar heating and methane evaporation/precipitation is simulated by an ocean circulation model. If the sea is transparent to sunlight, solar heating can induce anti-clockwise gyres near the sea surface and clockwise gyres near the sea bottom. The gyres are in geostrophic balance between the radially symmetric pressure gradient force and Coriolis force. If instead the sea is turbid and most sunlight is absorbed near the sea surface, the sea gets stratified in warm seasons and the circulation remains weak. Precipitation causes compositional stratification of the sea to an extent that the sea surface temperature can be lower than the sea interior temperature without causing a convective overturning. Non-uniform precipitation can also generate a latitudinal gradient in the methane mole fraction and density, which drives a meridional overturning with equatorward currents near the sea surface and poleward currents near the sea bottom. However, gyres are more ubiquitous than meridional overturning.
泰坦海域的风驱动环流
DOI: 10.1002/2014je004751
发表时间: 2015
期刊: Journal of Geophysical Research: Planets
影响因子: --
作者:
Tokano;Lorenz
通讯作者: Lorenz
DOI: 10.1016/j.icarus.2014.08.021
发表时间: 2014
期刊: Icarus
影响因子: 3.2
作者:
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通讯作者: Van Hoolst
卡西尼号无线电掩星证明泰坦对流层中全球甲烷分布不均匀
DOI: 10.1016/j.icarus.2013.11.030
发表时间: 2014
期刊: Icarus
影响因子: 3.2
作者:
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泰坦极地海域上空可能出现热带气旋吗?
DOI: 10.1016/j.icarus.2013.01.023
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期刊: Icarus
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