Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Carme Huguet; Joyanto Routh; Susanne Fietz; Mahjoor Ahmad Lone; M. S. Kalpana; Prosenjit Ghosh; Augusto Mangini; Vikash Kumar; Ravi Rangarajan

doi:10.1038/s41598-018-23606-w

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Carme Huguet, Joyanto Routh^*, Susanne Fietz, Mahjoor Ahmad Lone, M. S. Kalpana, Prosenjit Ghosh, Augusto Mangini, Vikash Kumar, Ravi Rangarajan

^*Corresponding author for this work

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Abstract

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

Original language	English
Article number	5386
Number of pages	10
Journal	Scientific Reports
Volume	8
Early online date	29 Mar 2018
DOIs	https://doi.org/10.1038/s41598-018-23606-w
Publication status	Published - Dec 2018
Externally published	Yes

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@article{0790e34a0cf143deaa0e762719451249,

title = "Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics",

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

author = "Carme Huguet and Joyanto Routh and Susanne Fietz and Lone, {Mahjoor Ahmad} and Kalpana, {M. S.} and Prosenjit Ghosh and Augusto Mangini and Vikash Kumar and Ravi Rangarajan",

note = "Funding information: JR thanks Teddy Mawlong and PK Theophilus for helping with sampling. We greatly appreciate help from Rene Eichst{\"a}dter and Susanne Karlsson for analytical help in the laboratory. The project was supported by funding from SIDA (Grant 2009–089) to JR. SF acknowledges support from the South African National Research Foundation (Grant 93072, 98905). CH was supported by the FAPA project (PR.3.2015.2423; Los Andes University). MAL acknowledges support from the Ministry of Science and Technology, Taiwan (106-2628-M-002-013, 106-2811-M-002-080). Finally, we greatly appreciate the thoughtful comments by the anonymous reviewers which greatly improved the paper.",

year = "2018",

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doi = "10.1038/s41598-018-23606-w",

language = "English",

volume = "8",

journal = "Scientific Reports",

issn = "2045-2322",

publisher = "Nature Publishing Group",

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T2 - Last Glacial-Interglacial Climate Dynamics

AU - Huguet, Carme

AU - Routh, Joyanto

AU - Fietz, Susanne

AU - Lone, Mahjoor Ahmad

AU - Kalpana, M. S.

AU - Ghosh, Prosenjit

AU - Mangini, Augusto

AU - Kumar, Vikash

AU - Rangarajan, Ravi

N1 - Funding information: JR thanks Teddy Mawlong and PK Theophilus for helping with sampling. We greatly appreciate help from Rene Eichstädter and Susanne Karlsson for analytical help in the laboratory. The project was supported by funding from SIDA (Grant 2009–089) to JR. SF acknowledges support from the South African National Research Foundation (Grant 93072, 98905). CH was supported by the FAPA project (PR.3.2015.2423; Los Andes University). MAL acknowledges support from the Ministry of Science and Technology, Taiwan (106-2628-M-002-013, 106-2811-M-002-080). Finally, we greatly appreciate the thoughtful comments by the anonymous reviewers which greatly improved the paper.

PY - 2018/12

Y1 - 2018/12

N2 - High-resolution paleoclimate data on stable isotopes in a stalagmite were coupled to glycerol dialkyl glycerol tetraethers (GDGTs). The Indian Summer Monsoon (ISM) transitioned from limited rainfall during the Last Glacial Maximum (LGM) to intense precipitation during early Holocene (22 to 6 ka). This was associated with changes in stalagmite growth, abundance of branched (br) and isoprenoid (iso) GDGTs, as well as δ18O, δ13C, Sr/Ca and GDGT-derived signals providing both temperature and moisture information. The reconstructed mean annual air temperature (MAAT) of the most modern stalagmite sample at ~19 °C, matches the surface and cave MAAT, but was ~4 °C lower during LGM. Warming at the end of LGM occurred before ISM strengthened and indicate 6 ka lag consistent with sea surface temperature records. The isotope records during the Younger Dryas show rapid progressions to dry conditions and weak monsoons, but these shifts are not coupled to TEX86. Moreover, change to wetter and stronger ISM, along with warmer Holocene conditions are not continuous indicating a decoupling of local temperatures from ISM.

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

U2 - 10.1038/s41598-018-23606-w

DO - 10.1038/s41598-018-23606-w

M3 - Article

SN - 2045-2322

VL - 8

JO - Scientific Reports

JF - Scientific Reports

M1 - 5386

ER -

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

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