Mid to late holocene dry events in Colombia’s super humid Western Cordillera reveal changes in regional atmospheric circulation

Jaramillo, Daniel; Vélez, María Isabel Álvarez; Escobar, Jaime; Pardo-Trujillo, Andrés; Vallejo, Franco Alirio; Villegas, Juan Camilo; Acevedo, Alba L.; Curtis, Jason H.; Rincón, Henry; Trejos-Tamayo, Raúl

doi:10.1016/j.quascirev.2021.106937

Cited by 6 publications

(1 citation statement)

References 55 publications

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“…This humid event seems to be recorded in the central Peruvian Andes at 10°S (Kanner et al, 2013), although it is absent in records from the tropical Andes of Peru, Ecuador, and Colombia further north (e.g. Bird et al, 2011;Jaramillo et al, 2021;Haug et al, 2001). These spatial differences prompted the suggestion than an extra-tropical moisture source could have contributed to this event (Bird et al, 2011;Jara et al, 2019;Hooper et al, 2020).…”

Section: Introductionmentioning

confidence: 98%

Exploring the causes of multicentury pluvials in the Altiplano with a climate modelling experiment

Jara,

Astudillo,

Salinas

et al. 2024

Preprint

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Abstract. Proxy records have long documented the existence of multicentury hydroclimate anomalies in the Altiplano of South America. However, the causes and mechanisms of these events are still largely unknown. Here we present the results of an innovative climate modelling experiment that explores the oceanic drivers and atmospheric mechanisms conducive to long-term precipitation variability in the southern part of the Altiplano (18–25° S). For doing so, we performed 100-yr-long hydroclimate simulations using a regional climate model forced by climatological conditions that resulted in pluvial December-January-February (DJF) seasons during historical times. Our modelling simulations produce long-term negative DJF precipitation trends for the southern Altiplano, suggesting that the mechanisms leading to historical wet summers are unable to sustain century-scale pluvials such as the ones documented in paleoclimate records. Our simulations show that permanent La Niña conditions, as well as SSTs anomalies in the southern tropical Atlantic, progressively reinforce upper and lower-troposphere features that inhibit moisture transport towards the Altiplano. We further observed increases in March-April-May precipitation, suggesting the emergence of a long-term seasonal shift. Our simulations reproduce a sustained northward migration of the Atlantic trade winds, resulting in contrasting hydroclimate responses between the Altiplano and the tropical Andes. The atmospheric processes associated with these differences provide a useful analogue for explaining divergences in proxy records. Our study shows how regional climate modelling can be used to test paleoclimate hypothesis, emphasizing the necessity of combining proxy and modelling data to improve our understanding of long-term hydroclimate change.

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Section: Introductionmentioning

confidence: 98%

Exploring the causes of multicentury pluvials in the Altiplano with a climate modelling experiment

Jara,

Astudillo,

Salinas

et al. 2024

Preprint

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Unravelling the distribution of mycorrhizal plants in the Colombian páramos

Diaz,

Leon,

Peyre

2024

Folia Geobot

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The tropicalpine páramo stands out as a unique biodiversity hotspot located in the northern Andes. Over the last decades, páramo plants and animals have been increasingly studied, yet a critical knowledge gap remains on their microbial ecology. Given the crucial importance of mycorrhiza in structural and functional communities, our study aimed to explore their geographic distribution in the Colombian páramos. Specifically, we used information about their host plants as a proxy and modelled their current distribution to unravel spatial patterns related to mycorrhizal status and mycorrhizal types. We constructed species distribution models for 440 vascular plant species representatives of the Colombian páramos using a combination of climatic and edaphic variables. Then we stacked the models following species classification into their mycorrhizal type: arbuscular, ectomycorrhizal, ericoid, orchid, and non-mycorrhizal. Our results suggest that the abundance of mycorrhizal species decreases with increasing elevation and in the west-to-east direction. The arbuscular type of mycorrhiza is chiefly dominant and spreads out widely throughout the Colombian páramos. The other types showed singular patterns, with (i) species having ericoid mycorrhiza being abundant in both the southern (Nariño–Putumayo) and the northern páramos (Sierra Nevada–Perijá); (ii) species with orchid mycorrhiza being abundant in the Western Cordillera and overall at low elevations, (iii) ectomycorrhizal species being absent, and (iv) non-mycorrhizal species being widely spread and reaching high elevations. Our study highlights the potentially high level of mycorrhization of this alpine system and contributes new spatial and environmental information towards a better understanding of mycorrhizal biogeography in tropical mountains.

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Sediment provenance signal of the Northern Andes during the Oligocene-Pliocene: Insights from the detrital record of the forearc and intra-arc basins, northwestern Colombian margin

Echeverri,

Celis,

Pardo-Trujillo

2025

Journal of South American Earth Sciences

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Mid to late holocene dry events in Colombia’s super humid Western Cordillera reveal changes in regional atmospheric circulation

Cited by 6 publications

References 55 publications

Exploring the causes of multicentury pluvials in the Altiplano with a climate modelling experiment

Exploring the causes of multicentury pluvials in the Altiplano with a climate modelling experiment

Unravelling the distribution of mycorrhizal plants in the Colombian páramos

Sediment provenance signal of the Northern Andes during the Oligocene-Pliocene: Insights from the detrital record of the forearc and intra-arc basins, northwestern Colombian margin

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