Guimarães, K.S., Marimon, B.S., Locosselli, G.M. et al. (8 more authors) (2023) Intra-annual stable isotopes in the tree rings of Hymenaea courbaril as a proxy for hydroclimate variations in southern Amazonia. Dendrochronologia, 83. 126151. ISSN 1125-7865
Abstract
The hydrology of Amazonia is changing due to climate and land-use changes, especially in the southern region, which has warmed and dried faster than other tropical regions. Yet there are no long-term hydrological records to put these changes in a historical perspective. Here we investigate the use of tree-ring carbon (δ13C) and oxygen isotopes (δ18O) to assess the seasonal variation in climate for the southern Amazonia basin. We analysed the intra-annual variation of δ13C and δ18O in 10 segments for each tree ring from 2013 to 2017 from individuals of Hymenaea courbaril, a long-lived and widespread neotropical tree species. We find strong seasonal patterns of tree-ring δ13C supporting previous observations of annual growth rhythms for this species. The intra-annual variation in δ18O shows point to the lowest values generally just after the middle of the rings that corresponds to the peak rainy season. We find strong correlations between the δ18O in the middle of the growth ring and vapour pressure deficit (r = 0.92, P = 0.02) and precipitation (r = -0.93, P = 0.02). We further find associations between the oxygen isotopic series and the discharge of the Araguaia basin’s main rivers during the rainy period. Our results show that these δ18O records are sensitive to fluctuations in rainfall and humidity, and thus reflect river discharge in the region, and that longer reconstructions of δ18O tree ring of Hymenaea courbaril could provide a novel proxy to assess past hydrological changes.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2023 Published by Elsevier. This is an author produced version of an article published in Dendrochronologia. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | jatobá-da-mata, oxygen isotopes, carbon isotopes, intra-annual isotopes, river discharge |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds) > Ecology & Global Change (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Dec 2023 12:49 |
Last Modified: | 01 Dec 2024 01:13 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.dendro.2023.126151 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:206311 |
Downloads
Filename: Dendrochronologia.Hymenaea.courbaril.isotopes.pdf
Licence: CC-BY-NC-ND 4.0
Filename: SupplementaryInformation.pdf
Licence: CC-BY-NC-ND 4.0