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- W3217162387 endingPage "1414" @default.
- W3217162387 startingPage "1401" @default.
- W3217162387 abstract "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 (δ18OTR) from six floodplain trees from the western Amazon to assess changes in past climate. Our analysis shows that δ18OTR 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 δ18OTR increases by approximately 2‰ over the last four decades (~ 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 δ18OTR record further suggests such drying trend may not be unprecedented over the past 80 years. Analysis of δ18OTR with sea surface temperatures indicates a strong role of a warming Tropical North Atlantic Ocean in driving this long-term increase in δ18OTR and decrease in dry season rainfall.The online version contains supplementary material available at 10.1007/s00382-021-06046-7." @default.
- W3217162387 created "2021-12-06" @default.
- W3217162387 creator A5001507127 @default.
- W3217162387 creator A5007210509 @default.
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- W3217162387 creator A5066937680 @default.
- W3217162387 creator A5073308805 @default.
- W3217162387 creator A5074241113 @default.
- W3217162387 creator A5088493254 @default.
- W3217162387 date "2021-11-26" @default.
- W3217162387 modified "2023-10-11" @default.
- W3217162387 title "Tree-ring oxygen isotopes record a decrease in Amazon dry season rainfall over the past 40 years" @default.
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