Fig. 7
From: A role for orbital eccentricity in Earth’s seasonal climate
a Earth’s continental distribution has a longitudinal asymmetry: the ‘Marine’ hemisphere centered over the Pacific is mostly ocean, whereas the opposing ‘Continental’ hemisphere centered over Africa is largely land. Insolation variations due to the distance effect act on the thermal difference between these hemispheres to produce the zonal wavenumber 1 seasonal response. b One consequence of the zonal interhemispheric seasonal response to the distance effect is an east–west seasonal migration of the Walker uplift region. It is the distance-effect analog of the north–south ITCZ migration from the tilt effect. The blue shading indicates the annual mean rainfall climatology (1998–2018) from the Tropical Rainfall Measuring Mission 3B43 dataset (Huffman et al. 2007)