Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics
作者： Carme Huguet , Joyanto Routh , Susanne Fietz , Mahjoor Ahmad Lone , M. S. Kalpana
DOI: 10.1038/S41598-018-23606-W
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摘要: High-resolution paleoclimate data on stable isotopes in a stalagmite were coupled to glycerol dialkyl tetraethers (GDGTs). The Indian Summer Monsoon (ISM) transitioned from limited rainfall during the Last Glacial Maximum (LGM) intense precipitation early Holocene (22 6 ka). This was associated with changes growth, abundance of branched (br) and isoprenoid (iso) GDGTs, as well δ18O, δ13C, Sr/Ca GDGT-derived signals providing both temperature moisture information. reconstructed mean annual air (MAAT) most modern sample at ~19 °C, matches surface cave MAAT, but ~4 °C lower LGM. Warming end LGM occurred before ISM strengthened indicate ka lag consistent sea records. isotope records Younger Dryas show rapid progressions dry conditions weak monsoons, these shifts are not TEX86. Moreover, change wetter stronger ISM, along warmer continuous indicating decoupling local temperatures ISM.
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