Decoupled Asian monsoon intensity and precipitation during glacial-interglacial transitions on the Chinese Loess Plateau
2022-09-14 NATURE COMMUNICATIONS 2022 13(卷), 1(期), (null页)
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The discrepancies among the variations in global ice volume, cave stalagmite delta O-18 and rainfall reconstructed by cosmogenic Be-10 tremendously restrain our understanding of the evolution of the East Asian summer monsoon (EASM). Here, we present a 430-ka EASM mean annual precipitation record on the Chinese Loess Plateau obtained using branched glycerol dialkyl glycerol tetraethers based on a deep learning neural network; this rainfall record corresponds well with cave-derived delta O-18 data from southern China but differs from precipitation reconstructed by Be-10. Both branched tetraether membrane lipids and cave delta O-18 may be affected by soil moisture and atmospheric temperature when glacial and interglacial conditions alternated and were thus decoupled from atmospheric precipitation; instead, they represent variations in the intensity of the EASM. Furthermore, we demonstrate that the brGDGT-DLNN method can significantly extend the temporal scale record of the EASM and is not restricted by geographic location compared with stalagmite records.
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