Latest Neogene monsoon of the Chotanagpur Plateau, eastern India, as revealed by fossil leaf architectural signatures

Taposhi Hazra; Robert A. Spicer; Manoshi Hazra; Sumana Mahato; Teresa E V Spicer; S Bera; Paul J Valdes; Alexander J Farnsworth; Alice Hughes; Jian Yang; Mahasin Khan

doi:10.1016/j.palaeo.2020.109641

Latest Neogene monsoon of the Chotanagpur Plateau, eastern India, as revealed by fossil leaf architectural signatures

Taposhi Hazra, Robert A. Spicer, Manoshi Hazra, Sumana Mahato, Teresa E V Spicer, S Bera, Paul J Valdes, Alexander J Farnsworth, Alice Hughes, Jian Yang, Mahasin Khan^*

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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Abstract

A fossil leaf assemblage from latest Neogene (Pliocene) sediments exposed in Jharkhand of Chotonagpur Plateau, eastern India, is subjected to a CLAMP (Climate Leaf Analysis Multivariate Program) analysis using a new high spatial resolution (~1 km2) WorldClim2 gridded climate data and PhysgAsia2 calibration. The CLAMP analysis of 80 different morphotypes of fossil leaves indicates a mean annual temperature (MAT) of 21.9 °C ± 2.3 °C; a cold month mean temperature (CMMT) of 16.7 °C ± 3.5 °C and a warm month mean temperature (WMMT) of 26.9 °C ± 2.9 °C. Precipitation estimates have high uncertainties but suggest a weak monsoon with a growing season (11.7 ± 1 months) precipitation (GSP) of 201.2 ± 64.3 cm. The new calibration also provides for the first time in India more detailed insights into the hydrological regime through the return of annual and seasonal vapour pressure deficit (VPD) and potential evapotranspiration (PET) estimates, as well as new thermal overviews through measures of thermicity and growing degree days. The new results confirm the overall warmth of the region. Although rainfall estimates have large uncertainties due to year-round wet soils, measures of VPD and PET show persistent high humidity, but with higher evaporative stress in the summer during late Neogene times than now.

Original language	English
Article number	109641
Number of pages	14
Journal	Palaeogeography, Palaeoclimatology, Palaeoecology
Volume	545
Early online date	8 Feb 2020
DOIs	https://doi.org/10.1016/j.palaeo.2020.109641
Publication status	Published - 1 May 2020

Keywords

Fossil leaves
Jharkhand
CLAMP
Pliocene
Environmental variables
Precipitation seasonality

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10.1016/j.palaeo.2020.109641

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Hazra, T., Spicer, R. A., Hazra, M., Mahato, S., Spicer, T. E. V., Bera, S., Valdes, P. J., Farnsworth, A. J., Hughes, A., Yang, J., & Khan, M. (2020). Latest Neogene monsoon of the Chotanagpur Plateau, eastern India, as revealed by fossil leaf architectural signatures. Palaeogeography, Palaeoclimatology, Palaeoecology, 545, [109641]. https://doi.org/10.1016/j.palaeo.2020.109641

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title = "Latest Neogene monsoon of the Chotanagpur Plateau, eastern India, as revealed by fossil leaf architectural signatures",

abstract = "A fossil leaf assemblage from latest Neogene (Pliocene) sediments exposed in Jharkhand of Chotonagpur Plateau, eastern India, is subjected to a CLAMP (Climate Leaf Analysis Multivariate Program) analysis using a new high spatial resolution (~1 km2) WorldClim2 gridded climate data and PhysgAsia2 calibration. The CLAMP analysis of 80 different morphotypes of fossil leaves indicates a mean annual temperature (MAT) of 21.9 °C ± 2.3 °C; a cold month mean temperature (CMMT) of 16.7 °C ± 3.5 °C and a warm month mean temperature (WMMT) of 26.9 °C ± 2.9 °C. Precipitation estimates have high uncertainties but suggest a weak monsoon with a growing season (11.7 ± 1 months) precipitation (GSP) of 201.2 ± 64.3 cm. The new calibration also provides for the first time in India more detailed insights into the hydrological regime through the return of annual and seasonal vapour pressure deficit (VPD) and potential evapotranspiration (PET) estimates, as well as new thermal overviews through measures of thermicity and growing degree days. The new results confirm the overall warmth of the region. Although rainfall estimates have large uncertainties due to year-round wet soils, measures of VPD and PET show persistent high humidity, but with higher evaporative stress in the summer during late Neogene times than now.",

keywords = "Fossil leaves, Jharkhand, CLAMP, Pliocene, Environmental variables, Precipitation seasonality",

author = "Taposhi Hazra and Spicer, {Robert A.} and Manoshi Hazra and Sumana Mahato and Spicer, {Teresa E V} and S Bera and Valdes, {Paul J} and Farnsworth, {Alexander J} and Alice Hughes and Jian Yang and Mahasin Khan",

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doi = "10.1016/j.palaeo.2020.109641",

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T1 - Latest Neogene monsoon of the Chotanagpur Plateau, eastern India, as revealed by fossil leaf architectural signatures

AU - Hazra, Taposhi

AU - Spicer, Robert A.

AU - Hazra, Manoshi

AU - Mahato, Sumana

AU - Spicer, Teresa E V

AU - Bera, S

AU - Valdes, Paul J

AU - Farnsworth, Alexander J

AU - Hughes, Alice

AU - Yang, Jian

AU - Khan, Mahasin

PY - 2020/5/1

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N2 - A fossil leaf assemblage from latest Neogene (Pliocene) sediments exposed in Jharkhand of Chotonagpur Plateau, eastern India, is subjected to a CLAMP (Climate Leaf Analysis Multivariate Program) analysis using a new high spatial resolution (~1 km2) WorldClim2 gridded climate data and PhysgAsia2 calibration. The CLAMP analysis of 80 different morphotypes of fossil leaves indicates a mean annual temperature (MAT) of 21.9 °C ± 2.3 °C; a cold month mean temperature (CMMT) of 16.7 °C ± 3.5 °C and a warm month mean temperature (WMMT) of 26.9 °C ± 2.9 °C. Precipitation estimates have high uncertainties but suggest a weak monsoon with a growing season (11.7 ± 1 months) precipitation (GSP) of 201.2 ± 64.3 cm. The new calibration also provides for the first time in India more detailed insights into the hydrological regime through the return of annual and seasonal vapour pressure deficit (VPD) and potential evapotranspiration (PET) estimates, as well as new thermal overviews through measures of thermicity and growing degree days. The new results confirm the overall warmth of the region. Although rainfall estimates have large uncertainties due to year-round wet soils, measures of VPD and PET show persistent high humidity, but with higher evaporative stress in the summer during late Neogene times than now.

AB - A fossil leaf assemblage from latest Neogene (Pliocene) sediments exposed in Jharkhand of Chotonagpur Plateau, eastern India, is subjected to a CLAMP (Climate Leaf Analysis Multivariate Program) analysis using a new high spatial resolution (~1 km2) WorldClim2 gridded climate data and PhysgAsia2 calibration. The CLAMP analysis of 80 different morphotypes of fossil leaves indicates a mean annual temperature (MAT) of 21.9 °C ± 2.3 °C; a cold month mean temperature (CMMT) of 16.7 °C ± 3.5 °C and a warm month mean temperature (WMMT) of 26.9 °C ± 2.9 °C. Precipitation estimates have high uncertainties but suggest a weak monsoon with a growing season (11.7 ± 1 months) precipitation (GSP) of 201.2 ± 64.3 cm. The new calibration also provides for the first time in India more detailed insights into the hydrological regime through the return of annual and seasonal vapour pressure deficit (VPD) and potential evapotranspiration (PET) estimates, as well as new thermal overviews through measures of thermicity and growing degree days. The new results confirm the overall warmth of the region. Although rainfall estimates have large uncertainties due to year-round wet soils, measures of VPD and PET show persistent high humidity, but with higher evaporative stress in the summer during late Neogene times than now.

KW - Fossil leaves

KW - Jharkhand

KW - CLAMP

KW - Pliocene

KW - Environmental variables

KW - Precipitation seasonality

U2 - 10.1016/j.palaeo.2020.109641

DO - 10.1016/j.palaeo.2020.109641

M3 - Article (Academic Journal)

SN - 0031-0182

VL - 545

JO - Palaeogeography, Palaeoclimatology, Palaeoecology

JF - Palaeogeography, Palaeoclimatology, Palaeoecology

M1 - 109641

ER -

Latest Neogene monsoon of the Chotanagpur Plateau, eastern India, as revealed by fossil leaf architectural signatures

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