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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tree-ring oxygen isotopes record a decrease in Amazon dry season rainfall over the past 40 years

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Cintra, Bruno B. L. [1, 2] ; Gloor, Manuel [1] ; Boom, Arnoud [3] ; Schongart, Jochen [4] ; Baker, Jessica C. A. [5] ; Cruz, Francisco W. [6] ; Clerici, Santiago [1] ; Brienen, Roel J. W. [1]
Total Authors: 8
[1] Univ Leeds, Sch Geog, Garstang North Bldg, Leeds LS2 9JT, W Yorkshire - England
[2] Univ Sao Paulo, Inst Biosci, Rua Matao 14, BR-05508090 Sao Paulo - Brazil
[3] Univ Leicester, Sch Geog Geol & Environm, Bennet Bldg, Univ Rd, Leicester LE1 7RH, Leics - England
[4] Natl Inst Amazon Res, Coordinat Environm Dynam, Av Andre Araujo 2936, BR-69067375 Manaus, Amazonas - Brazil
[5] Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire - England
[6] Univ Sao Paulo, Inst Geosci, Rua Lago 562, BR-05508080 Sao Paulo - Brazil
Total Affiliations: 6
Document type: Journal article
Source: Climate Dynamics; NOV 2021.
Web of Science Citations: 0

Extant climate observations suggest the dry season over large parts of the Amazon Basin has become longer and drier over recent decades. However, such possible intensification of the Amazon dry season and its underlying causes are still a matter of debate. Here we used oxygen isotope ratios in tree rings (delta O-18(TR)) from six floodplain trees from the western Amazon to assess changes in past climate. Our analysis shows that delta O-18(TR) of these trees is negatively related to inter-annual variability of precipitation during the dry season over large parts of the Amazon Basin, consistent with a Rayleigh rainout model. Furthermore delta O-18(TR) increases by approximately 2%c over the last four decades (similar to 1970-2014) providing evidence of an Amazon drying trend independent from satellite and in situ rainfall observations. Using a Rayleigh rainout framework, we estimate basin-wide dry season rainfall to have decreased by up to 30%. The delta O-18(TR) record further suggests such drying trend may not be unprecedented over the past 80 years. Analysis of delta O-18(TR) with sea surface temperatures indicates a strong role of a warming Tropical North Atlantic Ocean in driving this long-term increase in delta O-18(TR) and decrease in dry season rainfall. (AU)

FAPESP's process: 17/50085-3 - PIRE: climate research education in the Americas using tree-ring speleothem examples (PIRE-CREATE)
Grantee:Francisco William da Cruz Junior
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 19/25636-1 - Spatiotemporal patterns of variability of South American Monsoon System in Tropical South America during the last centuries based on speleothem and tree-ring records
Grantee:Bruno Barcante Ladvocat Cintra
Support Opportunities: Scholarships in Brazil - Post-Doctoral