A note on orbital control of equator-pole heat fluxes
A note on orbital control of equator-pole heat fluxes
复制标题
关于赤道极热通量轨道控制的注解
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
Wenwei Pan
中科院分区：
文献类型：
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作者：
R. Lindzen;Wenwei Pan
我们注意到，轨道（米兰科维奇）变化，特别是春分岁差，可以导致从热带到高纬度地区热量通量的深刻变化。其机制包括通过改变夏季纬向平均地表温度的赤道最大位移来改变哈德利环流的强度。分点的岁差使这个量的变化幅度超过2倍。哈德利环流的强度对冬季半球的热通量有重要影响。夏季热通量一般较小。虽然岁差周期以2万年左右的周期为特征，但其变化受偏心率的调节，偏心率的变化以10万年和40万年左右的周期为主。我们展示了小热通量和大热通量导致低降雪量（因此，小冰川积累）的事实如何引起热通量的解调，从而导致冰川作用的主要偏心期。
We note that orbital (Milankovitch) variations, in particular the precession of the equinoxes, can lead to profound variations in the flux of heat from the tropics to higher latitudes. The mechanism involves changing the intensity of the Hadley circulation by varying the maximum displacement from the equator of the zonally averaged surface temperature maximum in summer. The precession of the equinoxes causes this quantity to vary by more than a factor of 2. The intensity of the Hadley circulation has a major influence on the heat fluxes in the winter hemisphere. Summer heat fluxes are generally small. Although the precession cycle is characterized by periods in the neighborhood of 20000 years, the variations are modulated by the eccentricity whose variation is dominated by periods in the neighborhood of 100000 years and 400000 years. We show how the fact that both small and large heat fluxes lead to low snowfall (and, hence, small glacial accumulation) causes the demodulation of the heat flux leading to dominant eccentricity periods in the resulting glaciation.