ITCZ precipitation and cloud cover excursions control Cedrela nebulosa tree-ring oxygen and carbon isotopes in the northwestern Amazon

Vargas, Danny; Pucha-Cofrep, Darwin; Vincenti, Sheila Serrano; Burneo, Angélica; Carlosama, Lisseth; Herrera, Madison; Cerna, Marco; Molnár, Mihály; Jull, A. J. T.; Temovski, Marjan; László, E.; Futó, István; Horváth, Anikó; Palcsu, László

doi:10.1016/j.gloplacha.2022.103791

Cited by 9 publications

(13 citation statements)

References 73 publications

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Section: Study Site and Local Monitoring Campaignmentioning

confidence: 99%

“…at the eastern foothills of the Ecuadorian Andes (Figure 2). The climate is transitional between lowland and montane forests, receiving constant moisture throughout the year [13]. The seasonal distribution of precipitation is bimodal, with an average of 4500 mm annual precipitation.…”

Section: Study Site and Local Monitoring Campaignmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In South America, there has been little discussion about precipitation outside the South American Monsoon (SAM) spanning the equator [13]. This region is characterized by complex local topography interacting with the annual migration of the Intertropical Convergence Zone (ITCZ) [7,[13][14][15][16]. The ITCZ is a tropical belt of deep convective clouds where heat and moisture-laden surface trade winds converge, forming a zone of increased precipitation [2,17].…”

Section: Introductionmentioning

confidence: 99%

“…Previous research has established that the climate of Ecuador is indeed controlled by the ITCZ seasonal excursions and complex Andean orography [7,13,15]. In the first case, the ITCZ excursions throughout the year determine the provenance of air masses with different humidity and temperature conditions [2,7,15].…”

Section: Introductionmentioning

confidence: 99%

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Rainwater Isotopic Composition in the Ecuadorian Andes and Amazon Reflects Cross-Equatorial Flow Seasonality

Vargas

Chimborazo

László

et al. 2022

Water

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The variability of the rainfall stable isotopic values (δ2Hp, δ18Op) in the Ecuadorian Amazon to the Andes presents a marked local “altitude” effect. At the same time, this complex orography creates diverse precipitation regimes (unimodal, bimodal, and three-modal) that make it difficult to establish a relationship with the local amount. Nevertheless, stations along these regions show a similar intra-annual isotopic variability, with lower values during MAM and ON. In contrast, higher values are found during DJF and JAS in a w-shaped pattern, suggesting a common regional controller. A monthly δ2Hp and δ18Op collection campaign was established in Central Ecuador (n = 30) to complement stations biased towards the northern and southern parts. Based on back trajectory analysis, the results demonstrated that moisture arrives from two primary sources: the Tropical North Atlantic (DJFM) and the Amazon Basin (JAS). Nevertheless, their convergence (AMJ and ON) is the crucial factor modulating the lowest isotopic values. Precisely, this convergence is stronger at the V-Index region (5° S–5° N, 65°–75° W), where the wind seasonality and reversal at low levels are enhanced, allowing the inter-hemispheric moisture flux transport (cross-equatorial flow). We propose that the amount of rainfall located at the V-Index region is a more robust approach for explaining the δ2Hp and δ18Op variability rather than the local amount.

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Section: Study Site and Local Monitoring Campaignmentioning

confidence: 99%

Section: Study Site and Local Monitoring Campaignmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rainwater Isotopic Composition in the Ecuadorian Andes and Amazon Reflects Cross-Equatorial Flow Seasonality

Vargas

Chimborazo

László

et al. 2022

Water

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Growth periodicity in semi‐deciduous tropical tree species from the Congo Basin

Luse Belanganayi,

Delvaux,

Kearsley

et al. 2024

Plant Enviro Interactions

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In the tropics, more precisely in equatorial dense rainforest, xylogenesis is driven by a little distinct climatological seasonality, and many tropical trees do not show clear growth rings. This makes retrospective analyses and modeling of future tree performance difficult. This research investigates the presence, the distinctness, and the periodicity of growth ring for dominant tree species in two semi‐deciduous rainforests, which contrast in terms of precipitation dynamics. Eighteen tree species common to both forests were investigated. We used the cambial marking technique and then verified the presence and periodicity of growth‐ring boundaries in the wood produced between pinning and collection by microscopic and macroscopic observation. The study showed that all eighteen species can form visible growth rings in both sites. However, the periodicity of ring formation varied significantly within and between species, and within sites. Trees from the site with clearly defined dry season had a higher likelihood to form periodical growth rings compared to those from the site where rainfall seasonality is less pronounced. The distinctness of the formed rings however did not show a site dependency. Periodical growth‐ring formation was more likely in fast‐growing trees. Furthermore, improvements can be made by a detailed study of the cambial activity through microcores taken at high temporal resolution, to get insight on the phenology of the lateral meristem.

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Evaluation of the non-climatic (age-related) trends of stable oxygen and carbon isotopes in Swiss stone pine (Pinus cembra L.) tree rings from the Eastern Carpathians, Romania

et al. 2023

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ITCZ precipitation and cloud cover excursions control Cedrela nebulosa tree-ring oxygen and carbon isotopes in the northwestern Amazon

Cited by 9 publications

References 73 publications

Rainwater Isotopic Composition in the Ecuadorian Andes and Amazon Reflects Cross-Equatorial Flow Seasonality

Rainwater Isotopic Composition in the Ecuadorian Andes and Amazon Reflects Cross-Equatorial Flow Seasonality

Growth periodicity in semi‐deciduous tropical tree species from the Congo Basin

Evaluation of the non-climatic (age-related) trends of stable oxygen and carbon isotopes in Swiss stone pine (Pinus cembra L.) tree rings from the Eastern Carpathians, Romania

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