A Novel Post-1950 Ad Atmospheric c Record for the Tropics Using Absolutely Dated Tree Rings in the Equatorial Amazon
SSRN, ISSN: 1556-5068
2023
- 118Usage
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Article Description
In this study, we present a comprehensive atmospheric C record spanning from 1940 to 2016, derived from 77 single tree rings of Cedrela odorata located in the Eastern Amazon Basin (EAB). This record, comprising 175 high-precision radiocarbon measurements obtained through accelerator mass spectrometry (AMS), offers a detailed chronology of post-1950 A.D. C fluctuations in the Tropical Low-Pressure Belt (TLPB). To ensure accuracy and reliability, we included C-AMS results from successive cuts of the 1962 and 1963 tree rings and conducted interlaboratory comparisons. In addition, C concentrations in 1962 and 1963 single-yr cuts also allowed to verify tissue growth seasonality. The strategic location of the tree, just above the Amazon River and estuary areas, prevented the influence of local fossil-CO2 emissions from mining and trade activities in the Central Amazon Basin on the C record. Our findings reveal a notable increase in C from land-respired CO2 starting in the 1970s, a decade earlier than previously predicted, followed by a slight decrease after 2000, signaling a transition towards the fossil fuel era. This shift is likely attributed to changes in reservoir sources or global atmospheric dynamics. The EAB C record, when compared with a shorter record from Muna Island, Indonesia, highlights regional differences and contributes to a more nuanced understanding of global C variations at low latitudes. This study not only fills critical spatial gaps in existing C compilations but also aids in refining the demarcation of C variations over South America. The extended tree-ring C record from the EAB is pivotal for reevaluating global patterns, particularly in the context of the current global carbon budget, and underscores the importance of tropical regions in understanding carbon-climate feedbacks.
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