Traveling waves in the Northern Hemisphere of Mars
Traveling waves in the Northern Hemisphere of Mars
复制标题
火星北半球的行波
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Michael D. Smith
中科院分区：
文献类型：
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作者：
R. J. Wilson;D. Banfield;B. Conrath;Michael D. Smith
对火星全球探测器热发射光谱仪数据的温度反演分析揭示了北方半球存在规则的向东传播的波。在初冬（Ls = 220-270°），一个大振幅、长周期的纬向波1（1020 sol）尤为突出。在Ls = 270°以后，传播速度更快（6.5个太阳周期）的纬向波1占主导地位。这些波具有与冬季半球西风急流轴相关的深层垂直结构（>40 km）。用火星大气环流模型进行的模拟表明，由于火星表面强烈的纬向温度梯度，快波与斜压不稳定性有关，并且与维京海盗着陆器数据中看到的表面压力振荡一致。相比之下，慢波具有大振幅Rossby波的外观，与副热带的惯性不稳定区域相耦合。
Analysis of temperature retrievals from Mars Global Surveyor Thermal Emission Spectrometer data has revealed the presence of regular, eastward propagating waves in the Northern Hemisphere. A large amplitude, zonal wave 1 with a long (∼20 sol) period is particularly prominent during early winter (Ls = 220–270°). After Ls = 270°, a weaker and more rapidly propagating (6.5 sol period) zonal wave 1 is dominant. These waves have a deep vertical structure (>40 km) correlated with the axis of the winter hemisphere westerly jet. Simulations with a Mars general circulation model suggest that the fast wave is associated with baroclinic instability due to the strong meridional temperature gradient at the surface and is consistent with surface pressure oscillations seen in Viking Lander data. By contrast, the slow wave has the appearance of a large‐amplitude Rossby wave that is coupled with an inertially unstable region in the subtropics.