Fig. 4: Comparison of weathering records in tropical regions (Central West Africa and South Asia) with tropical temperature and nearby simulated rainfall records, as well as their corresponding spectral analysis results (right). | npj Climate and Atmospheric Science

Fig. 4: Comparison of weathering records in tropical regions (Central West Africa and South Asia) with tropical temperature and nearby simulated rainfall records, as well as their corresponding spectral analysis results (right).

From: Heterogeneity in ice sheets- vs. monsoon rainfall-induced silicate weathering from high to low latitudes

Fig. 4

a Indian summer rainfall record reconstructed from the Bittoo Cave speleothem (black line)62 and June 21 insolation differential between 30°N and 30°S (sky blue line)10. b Simulated rainfall (July–August–September (JAS) average) in South Asia (sediment source of the Bay of Bengal), (c) Smectite/(illite + chlorite) ratios from Site MD77-16932, (d) Simulated rainfall (August–September–October (ASO) average) in Central West Africa (sediment source of the Gulf of Guinea), (e) K/Al ratios from Site GeoB1008-334, (f) Average sea surface temperature (SST) in tropical regions63,64, (g) 57 stacked, globally distributed benthic δ18O records (LR04 stack)4. Note: In the spectral analysis, the red dotted lines indicate the 90% significance level.

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