Local and Regional Indian Summer Monsoon Precipitation Dynamics During Termination II and the Last Interglacial

Matthias Magiera; Franziska A. Lechleitner; Andrea M. Erhardt; Adam Hartland; Ola Kwiecien; Hai Cheng; Harold J. Bradbury; Alexandra V. Turchyn; Sylvia Riechelmann; Lawrence Edwards; Sebastian F.M. Breitenbach

doi:10.1029/2019GL083721

Local and Regional Indian Summer Monsoon Precipitation Dynamics During Termination II and the Last Interglacial

Matthias Magiera
, Franziska A. Lechleitner
, Andrea M. Erhardt
, Adam Hartland
, Ola Kwiecien
, Hai Cheng
, Harold J. Bradbury
, Alexandra V. Turchyn
, Sylvia Riechelmann
, Lawrence Edwards
, Sebastian F.M. Breitenbach

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

To date Indian summer monsoon (ISM) dynamics have been assessed by changes in stalagmite δ¹⁸O. However, stalagmite δ¹⁸O is influenced by multiple environmental factors (e.g., atmospheric moisture transport, rainfall amount at the study site, and ISM seasonality), precluding simple and clear reconstructions of rainfall amount or variability. This study aims to disentangle these environmental factors by combining δ¹⁸O, δ⁴⁴Ca, and elemental data from a stalagmite covering Termination II and the last interglacial from Mawmluh Cave, NE India, to produce a semiquantitative reconstruction of past ISM rainfall. We interpret δ¹⁸O as a mixed signal of rainfall source dynamics and rainfall amount and coupled δ⁴⁴Ca and X/Ca ratios as indicators of local infiltration rate and prior calcite precipitation in the karst zone. The wettest conditions in our studied interval (135 and 100 kyrs BP; BP = before present, with the present being 1950 CE) occurred during Marine Isotope Stage 5e. Our multiproxy data set suggests a likely change in seasonal distribution of Marine Isotope Stage 5e rainfall compared to the Holocene; the wet season was longer with higher-than-modern dry season rainfall. Using the last interglacial as an analogue for future anthropogenic warming, our data suggest a more erratic ISM behavior in a warmer world.

Original language	English
Pages (from-to)	12454-12463
Number of pages	10
Journal	Geophysical Research Letters
Volume	46
Issue number	21
DOIs	https://doi.org/10.1029/2019GL083721
State	Published - Nov 16 2019

Bibliographical note

Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.

Funding

This study received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska‐Curie grant 691037 (to SFMB, OK, AH). Calcium isotope analyses were supported through ERC StG 307582 CARBONSINK (to AVT) and NERC NE/R013519/1 (to HJB). Financial support came from the National Natural Science Foundation of China (NSFC‐41731174, to HC and LE), an award from the palaeoclimate program by the National Science Foundation (NSF‐1702816, to HC and LE), and a Rutherford Discovery Fellowship award (RDF‐UOW1601, to AH). Gregory Diengdoh (Shillong) is thanked for helping during sampling and Ingrid Lindeman (University of Waikato) for assistance in measuring trace elements. We thank Beate Gehnen for assisting with stable isotope analysis. We thank Daniel E. Ibarra and an anonymous reviewer for their critical feedback on earlier versions of this manuscript and the editorial team of GRL for handling our submission All data will be archived on the NOAA website ( https://www.ncdc.noaa.gov/paleo/study/27990 ). This study received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk?odowska-Curie grant 691037 (to SFMB, OK, AH). Calcium isotope analyses were supported through ERC StG 307582 CARBONSINK (to AVT) and NERC NE/R013519/1 (to HJB). Financial support came from the National Natural Science Foundation of China (NSFC-41731174, to HC and LE), an award from the palaeoclimate program by the National Science Foundation (NSF-1702816, to HC and LE), and a Rutherford Discovery Fellowship award (RDF-UOW1601, to AH). Gregory Diengdoh (Shillong) is thanked for helping during sampling and Ingrid Lindeman (University of Waikato) for assistance in measuring trace elements. We thank Beate Gehnen for assisting with stable isotope analysis. We thank Daniel E. Ibarra and an anonymous reviewer for their critical feedback on earlier versions of this manuscript and the editorial team of GRL for handling our submission All data will be archived on the NOAA website (https://www.ncdc.noaa.gov/paleo/study/27990).

Funders	Funder number
European Union's Horizon 2020
European Commission
Rutherford Discovery Fellowship award
H2020 European Research Council
Horizon 2020
UK Industrial Decarbonization Research and Innovation Centre
National Natural Science Foundation of China (NSFC)	NSFC‐41731174
National Science Foundation Arctic Social Science Program	RDF-UOW1601, NSF‐1702816, RDF‐UOW1601
Seventh Framework Programme	307582
Horizon 2020 Framework Programme	691037
Natural Environment Research Council	NE/R013519/1

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 14 Life Below Water

Keywords

Indian summer monsoon
Marine Isotope Stage 5e
Termination II
dry season rainfall
seasonality
speleothem

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

Access to Document

10.1029/2019GL083721

Cite this

Magiera, M., Lechleitner, F. A., Erhardt, A. M., Hartland, A., Kwiecien, O., Cheng, H., Bradbury, H. J., Turchyn, A. V., Riechelmann, S., Edwards, L., & Breitenbach, S. F. M. (2019). Local and Regional Indian Summer Monsoon Precipitation Dynamics During Termination II and the Last Interglacial. Geophysical Research Letters, 46(21), 12454-12463. https://doi.org/10.1029/2019GL083721

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title = "Local and Regional Indian Summer Monsoon Precipitation Dynamics During Termination II and the Last Interglacial",

abstract = "To date Indian summer monsoon (ISM) dynamics have been assessed by changes in stalagmite δ18O. However, stalagmite δ18O is influenced by multiple environmental factors (e.g., atmospheric moisture transport, rainfall amount at the study site, and ISM seasonality), precluding simple and clear reconstructions of rainfall amount or variability. This study aims to disentangle these environmental factors by combining δ18O, δ44Ca, and elemental data from a stalagmite covering Termination II and the last interglacial from Mawmluh Cave, NE India, to produce a semiquantitative reconstruction of past ISM rainfall. We interpret δ18O as a mixed signal of rainfall source dynamics and rainfall amount and coupled δ44Ca and X/Ca ratios as indicators of local infiltration rate and prior calcite precipitation in the karst zone. The wettest conditions in our studied interval (135 and 100 kyrs BP; BP = before present, with the present being 1950 CE) occurred during Marine Isotope Stage 5e. Our multiproxy data set suggests a likely change in seasonal distribution of Marine Isotope Stage 5e rainfall compared to the Holocene; the wet season was longer with higher-than-modern dry season rainfall. Using the last interglacial as an analogue for future anthropogenic warming, our data suggest a more erratic ISM behavior in a warmer world.",

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Magiera, M, Lechleitner, FA, Erhardt, AM, Hartland, A, Kwiecien, O, Cheng, H, Bradbury, HJ, Turchyn, AV, Riechelmann, S, Edwards, L & Breitenbach, SFM 2019, 'Local and Regional Indian Summer Monsoon Precipitation Dynamics During Termination II and the Last Interglacial', Geophysical Research Letters, vol. 46, no. 21, pp. 12454-12463. https://doi.org/10.1029/2019GL083721

TY - JOUR

T1 - Local and Regional Indian Summer Monsoon Precipitation Dynamics During Termination II and the Last Interglacial

AU - Magiera, Matthias

AU - Lechleitner, Franziska A.

AU - Erhardt, Andrea M.

AU - Hartland, Adam

AU - Kwiecien, Ola

AU - Cheng, Hai

AU - Bradbury, Harold J.

AU - Turchyn, Alexandra V.

AU - Riechelmann, Sylvia

AU - Edwards, Lawrence

AU - Breitenbach, Sebastian F.M.

PY - 2019/11/16

Y1 - 2019/11/16

N2 - To date Indian summer monsoon (ISM) dynamics have been assessed by changes in stalagmite δ18O. However, stalagmite δ18O is influenced by multiple environmental factors (e.g., atmospheric moisture transport, rainfall amount at the study site, and ISM seasonality), precluding simple and clear reconstructions of rainfall amount or variability. This study aims to disentangle these environmental factors by combining δ18O, δ44Ca, and elemental data from a stalagmite covering Termination II and the last interglacial from Mawmluh Cave, NE India, to produce a semiquantitative reconstruction of past ISM rainfall. We interpret δ18O as a mixed signal of rainfall source dynamics and rainfall amount and coupled δ44Ca and X/Ca ratios as indicators of local infiltration rate and prior calcite precipitation in the karst zone. The wettest conditions in our studied interval (135 and 100 kyrs BP; BP = before present, with the present being 1950 CE) occurred during Marine Isotope Stage 5e. Our multiproxy data set suggests a likely change in seasonal distribution of Marine Isotope Stage 5e rainfall compared to the Holocene; the wet season was longer with higher-than-modern dry season rainfall. Using the last interglacial as an analogue for future anthropogenic warming, our data suggest a more erratic ISM behavior in a warmer world.

AB - To date Indian summer monsoon (ISM) dynamics have been assessed by changes in stalagmite δ18O. However, stalagmite δ18O is influenced by multiple environmental factors (e.g., atmospheric moisture transport, rainfall amount at the study site, and ISM seasonality), precluding simple and clear reconstructions of rainfall amount or variability. This study aims to disentangle these environmental factors by combining δ18O, δ44Ca, and elemental data from a stalagmite covering Termination II and the last interglacial from Mawmluh Cave, NE India, to produce a semiquantitative reconstruction of past ISM rainfall. We interpret δ18O as a mixed signal of rainfall source dynamics and rainfall amount and coupled δ44Ca and X/Ca ratios as indicators of local infiltration rate and prior calcite precipitation in the karst zone. The wettest conditions in our studied interval (135 and 100 kyrs BP; BP = before present, with the present being 1950 CE) occurred during Marine Isotope Stage 5e. Our multiproxy data set suggests a likely change in seasonal distribution of Marine Isotope Stage 5e rainfall compared to the Holocene; the wet season was longer with higher-than-modern dry season rainfall. Using the last interglacial as an analogue for future anthropogenic warming, our data suggest a more erratic ISM behavior in a warmer world.

KW - Indian summer monsoon

KW - Marine Isotope Stage 5e

KW - Termination II

KW - dry season rainfall

KW - seasonality

KW - speleothem

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DO - 10.1029/2019GL083721

M3 - Article

AN - SCOPUS:85075289968

SN - 0094-8276

VL - 46

SP - 12454

EP - 12463

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 21

ER -

Local and Regional Indian Summer Monsoon Precipitation Dynamics During Termination II and the Last Interglacial

Abstract

Bibliographical note

Funding

UN SDGs

Keywords

ASJC Scopus subject areas

Access to Document

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