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2100～590 ABP STALAGMITE STABLE ISOTOPE RECORDS FROM TIAN'E CAVE AND THEIR REGIONAL CLIMATE SIGNIFICANCE

Jinquan Li

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Abstract

We present in this paper the 230Th-dated stalagmite stable isotope record from Tian'e Cave in Fujian province,Southeast China.This record provides an Asian Monsoon(AM) history during a time interval from 2 100~590 aBP.In the TE2 δ18O record,the long-term decreasing trend correlates well with the Heshang Cave δ18O change,supporting that the Asian Monsoon intensity is controlled by the migration of Inter-tropical Convergence Zone(ITCZ).A comparison between the stalagmite δ18O record and the Total Solar Irradiance record provides strong evidence for solar forcing of East Asian monsoon on centennial to multi-decadal time-scales.An important characteristic of the TE2 isotopic record is an abrupt large shift of the carbon isotopic ratio(4‰),suggesting intensified soil erosion occurred on the overlain soil due to the destruction of the climax vegetation as a result of constant human disturbance.

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We present in this paper the 230Th-dated stalagmite stable isotope record from Tian'e Cave in Fujian province,Southeast China.This record provides an Asian Monsoon(AM) history during a time interval from 2 100~590 aBP.In the TE2 δ18O record,the long-term decreasing trend correlates well with the Heshang Cave δ18O change,supporting that the Asian Monsoon intensity is controlled by the migration of Inter-tropical Convergence Zone(ITCZ).A comparison between the stalagmite δ18O record and the Total Solar Irradiance record provides strong evidence for solar forcing of East Asian monsoon on centennial to multi-decadal time-scales.An important characteristic of the TE2 isotopic record is an abrupt large shift of the carbon isotopic ratio(4‰),suggesting intensified soil erosion occurred on the overlain soil due to the destruction of the climax vegetation as a result of constant human disturbance.

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Available abstract

We present in this paper the 230Th-dated stalagmite stable isotope record from Tian'e Cave in Fujian province,Southeast China.This record provides an Asian Monsoon(AM) history during a time interval from 2 100~590 aBP.In the TE2 δ18O record,the long-term decreasing trend correlates well with the Heshang Cave δ18O change,supporting that the Asian Monsoon intensity is controlled by the migration of Inter-tropical Convergence Zone(ITCZ).A comparison between the stalagmite δ18O record and the Total Solar Irradiance record provides strong evidence for solar forcing of East Asian monsoon on centennial to multi-decadal time-scales.An important characteristic of the TE2 isotopic record is an abrupt large shift of the carbon isotopic ratio(4‰),suggesting intensified soil erosion occurred on the overlain soil due to the destruction of the climax vegetation as a result of constant human disturbance.

Key concepts: Stalagmite, Geology, δ18O, East Asian Monsoon, Intertropical Convergence Zone, Cave, Climatology, Speleothem

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2100～590 ABP STALAGMITE STABLE ISOTOPE RECORDS FROM TIAN'E CAVE AND THEIR REGIONAL CLIMATE SIGNIFICANCE — Research Paper | ScholarLens