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Orbital Forcing Controlling Dry Time Carbonate Precipitation Temperature Over Landmass in the Northern Mid-Latitude during Last 50,000 Years Revealed from Carbonate Clumped Isotope Thermometry


Affiliations
1 Interdisciplinary Centre for Water Research, Indian Institute of Science, Bengaluru 560 012, India
2 Centre for Earth Sciences, Indian Institute of Science, Bengaluru 560 012, India
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, India
 

Indian Summer Monsoon is an integrated component of the global climate system. The spatial movement of ITCZ at seasonal and orbital time scales is revealed in the ensemble of terrestrial and marine records covering the last 50,000 years. We deduced an evolutionary shift in the precipitation pattern near western North America, Mediterranean and South East Asia based on the estimated water isotopic composition from the δ18Ocarbonate and Δ47 thermometer. Record revealed three stages of climate transition: mid-Holocene optima, Younger Dryas and Last glacial maxima. Estimated mean arid air temperature was 9–21°C and 12–35°C during the glacial and interglacial periods respectively. The June summer solar insolation at 65°N is captured in the temperature record linked with ice volume, atmospheric CO2 levels and sea surface temperature; factors influencing the monsoon precipitation near mid-latitude region worldwide.

Keywords

Clumped Isotopes, Monsoon, Orbital Forcing.
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  • Orbital Forcing Controlling Dry Time Carbonate Precipitation Temperature Over Landmass in the Northern Mid-Latitude during Last 50,000 Years Revealed from Carbonate Clumped Isotope Thermometry

Abstract Views: 339  |  PDF Views: 128

Authors

Yogaraj Banerjee
Interdisciplinary Centre for Water Research, Indian Institute of Science, Bengaluru 560 012, India
S. Thamizharasan
Centre for Earth Sciences, Indian Institute of Science, Bengaluru 560 012, India
Prosenjit Ghosh
Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, India

Abstract


Indian Summer Monsoon is an integrated component of the global climate system. The spatial movement of ITCZ at seasonal and orbital time scales is revealed in the ensemble of terrestrial and marine records covering the last 50,000 years. We deduced an evolutionary shift in the precipitation pattern near western North America, Mediterranean and South East Asia based on the estimated water isotopic composition from the δ18Ocarbonate and Δ47 thermometer. Record revealed three stages of climate transition: mid-Holocene optima, Younger Dryas and Last glacial maxima. Estimated mean arid air temperature was 9–21°C and 12–35°C during the glacial and interglacial periods respectively. The June summer solar insolation at 65°N is captured in the temperature record linked with ice volume, atmospheric CO2 levels and sea surface temperature; factors influencing the monsoon precipitation near mid-latitude region worldwide.

Keywords


Clumped Isotopes, Monsoon, Orbital Forcing.



DOI: https://doi.org/10.18520/cs%2Fv119%2Fi2%2F265-272