Listar GI-GRICA - Artigos por autor "Bao, Roberto"
Mostrando ítems 1-20 de 26
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A 68 ka precipitation record from the hyperarid core of the Atacama Desert in northern Chile
Diederich, Julia L.; Wennrich, Volker; Bao, Roberto; Büttner, Christoph; Bolten, Andreas; Brill, Dominik; Buske, Stefan; Campos, Eduardo; Fernández-Galego, Emma; Gödickmeier, Peggy; Ninnemann, Lukas; Reyers, Mark; Ritter, Benedikt; Ritterbach, Laura; Rolf, Christian; Scheidt, Stephanie; Dunai, Tibor J.; Melles, Martin (Elsevier, 2020-01)[Abstract] The Atacama Desert in northern Chile is one of the driest deserts on Earth. Hyperaridity persists at least since the Miocene and was punctuated by pluvial phases. However, very little is known about the timing, ... -
Biogeochemical Processes Controlling Oxygen and Carbon Isotopes of Diatom Silica in Late Glacial to Holocene Lacustrine Rhythmites
Hernández, Armand; Bao, Roberto; Giralt, Santiago; Barker, Philip; Leng, Melanie; Sloane, Hilary; Sáez, Alberto (Elsevier, 2010-05-19)[Abstract] Biogeochemical cycles and sedimentary records in lakes are related to climate controls on hydrology and catchment processes. Changes in the isotopic composition of the diatom frustules (δ18Odiatom and δ13Cdiatom) ... -
Biogeography and lake morphometry drive diatom and chironomid assemblages’ composition in lacustrine surface sediments of oceanic islands
Pereira, Cátia Lúcio; Raposeiro, Pedro; Costa, Ana Cristina; Bao, Roberto; Giralt, Santiago; Gonçalves, Vítor (Springer, 2014)[Abstract] Subfossil biotic assemblages in lakes’ surface sediments have been used to infer ecological conditions across environmental gradients. Local variables are usually the major drivers of assemblage composition, but ... -
Carbonate and Organic Matter Sedimentation and Isotopic Signatures in Lake Chungará, Chilean Altiplano, During the Last 12.3 kyr
Pueyo Mur, Juan José; Sáez, Alberto; Giralt, Santiago; Valero Garcés, Blas; Moreno, Ana; Bao, Roberto; Schwalb, Antje; Herrera, Christian; Klosowska, Bogumila; Taberner, Conxita (Elsevier, 2011-05-22)[Abstract] Sediments in lakes in the Andean volcanic setting are often made up of diatomaceous ooze together with volcaniclastics and small amounts of carbonates. Despite their scarcity, carbonates along with organic matter ... -
Centennial-scale precipitation anomalies in the southern Altiplano (18° S) suggest an extratropical driver for the South American summer monsoon during the late Holocene
Jara, Ignacio A.; Maldonado, Antonio; González, Leticia; Hernández, Armand; Sáez, Alberto; Giralt, Santiago; Bao, Roberto; Valero Garcés, B. L. (European Geosciences Union, 2019-10-16)[Abstract] Modern precipitation anomalies in the Altiplano, South America, are closely linked to the strength of the South American summer monsoon (SASM), which is influenced by large-scale climate features sourced in the ... -
Challenging Easter Island’s Collapse: The Need for Interdisciplinary Synergies
Rull, V.; Cañellas-Boltà, Núria; Sáez, Alberto; Margalef, Olga; Bao, Roberto; Pla-Rábes, Sergi; Valero Garcés, Blas; Giralt, Santiago (Frontiers, 2013-12-17)[Abstract] The reigning paradigm holds that Easter Island suffered a socio-ecological collapse (ecocidal or not) sometime in the last millennium, prior to European contact (AD 1720). We discuss some novel paleoecological ... -
Climate Change Facilitated the Early Colonization of the Azores Archipelago During Medieval Times
Raposeiro, Pedro; Hernández, Armand; Pla-Rábes, Sergi; Gonçalves, Vítor; Bao, Roberto; Sáez, Alberto; Shanahan, Timothy; Benavente Marín, Mario; Boer, Erik de; Richter, Nora; Gordon, Verónica; Marques, Helena; Sousa, Pedro M.; Souto, M.; Matias, Miguel G.; Aguiar, Nicole; Pereira, Cátia; Ritter, Catarina; Rubio-Inglés, María Jesús; Salcedo Albert, Marina; Vázquez-Loureiro, David; Margalef, Olga; Amaral-Zettler, Linda; Costa, Ana Cristina; Huang, Yongsong; Leeuwen, Jacqueline F. N. van; Masque, Pere; Prego, Ricardo; Ruiz-Fernández, Ana Carolina; Sánchez-Cabeza, Joan-Albert; Trigo, R. M.; Giralt, Santiago (National Academy of Sciences of the United States of America, 2021-08-27)[Abstract] Humans have made such dramatic and permanent changes to Earth's landscapes that much of it is now substantially and irreversibly altered from its preanthropogenic state. Remote islands, until recently isolated ... -
Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central Andean Altiplano during the Lateglacial and Early Holocene
Hernández, Armand; Bao, Roberto; Giralt, Santiago; Sáez, Alberto; Leng, Melanie J.; Barker, Philip A.; Kendrick, Chris P.; Sloane, Hilary J. (Elsevier, 2013)Diatom-based carbon and oxygen isotope analyses (δ13Cdiatom and δ18Odiatom) were performed on diatom-rich laminated sediments of Lake Chungará (Andean Altiplano, northern Chile) deposited during the Lateglacial and Early ... -
Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
Bao, Roberto; Hernández, Armand; Sáez, Alberto; Giralt, Santiago; Prego, R.; Pueyo Mur, Juan José; Moreno Caballud, Ana; Valero Garcés, B. L. (Elsevier, 2015-12)The coupling of lake dynamics with catchment biogeochemistry is considered the key element controlling primary production in mountain lakes at time scales of a few decades to millennia, yet little is known on the impacts ... -
Climatic Fluctuations in the Hyperarid Core of the Atacama Desert During the Past 215 ka
Ritter, Benedikt; Wennrich, Volker; Medialdea, Alicia; Brill, Dominik; King, Georgina; Schneiderwind, Sascha; Niemann, Karin; Fernández-Galego, Emma; Diederich, Julia; Rolf, Christian; Bao, Roberto; Melles, Martin; Dunai, Tibor János (Springer Nature, 2019-03-27)[Abstract] Paleoclimate records from the Atacama Desert are rare and mostly discontinuous, mainly recording runoff from the Precordillera to the east, rather than local precipitation. Until now, paleoclimate records have ... -
Diatom-inferred ecological responses of an oceanic lake system to volcanism and anthropogenic perturbations since 1290 CE
Vázquez-Loureiro, David; Gonçalves, Vítor; Sáez, Alberto; Hernández, Armand; Raposeiro, Pedro; Giralt, Santiago; Rubio-Inglés, María Jesús; Rull, Valentí; Bao, Roberto (Elsevier, 2019-07-29)[Abstract] The impacts of natural- and human-induced processes on lake ecosystems in remote oceanic islands remain to be fully elucidated. These lakes are excellent candidates to analyze the importance of anthropogenic ... -
Dinámica de los sistemas dunares costeros ante el Cambio Global: la necesidad de una gestión sostenible
Hernández, Armand; González-Villanueva, Rita; Carballeira, Rafael; Bao, Roberto; Sáez, Alberto (Asociación Española para el Estudio del Cuaternario (AEQUA), 2023-06-20)[Resumen] El desarrollo y evolución de los sistemas arenosos costeros está gobernado por un frágil equilibrio dinámico entre la interacción de múltiples factores ambientales, y por ello estos sistemas naturales son altamente ... -
ENSO and Solar Activity Signals From Oxygen Isotopes in Diatom Silica During Late Glacial-Holocene Transition in Central Andes (18°S)
Hernández, Armand; Giralt, Santiago; Bao, Roberto; Sáez, Alberto; Leng, Melanie; Barker, Philip (Springer, 2010-02)[Abstract] The late glacial-Holocene transition from the Lago Chungará sedimentary record in northern Chilean Altiplano (18°S) is made up of laminated sediments composed of light-white and dark-green pluriannual couplets ... -
Formation and Evolution of Back-Barrier Perched Lakes in Rocky Coasts: An Example of a Holocene System in North-West Spain
Sáez, Alberto; Carballeira, Rafael; Pueyo Mur, Juan José; Vázquez-Loureiro, David; Leira, Manel; Hernández, Armand; Valero Garcés, Blas; Bao, Roberto (Wiley, 2018-09-22)[Abstract] Coastal back-barrier perched lakes are freshwater bodies that are elevated over sea-level and are not directly subjected to the inflow of seawater. This study provides a detailed reconstruction of the Doniños ... -
Holocene Sea Level and Climate Interactions on Wet Dune Slack Evolution in SW Portugal: A Model for Future Scenarios?
Leira, Manel; Freitas, Maria da Conceição; Ferreira, T.; Cruces, Anabela; Connor, Simon; Andrade, C.; Lopes, Vera; Bao, Roberto (Sage, 2018)[Abstract] We examine the Holocene environmental changes in a wet dune slack of the Portuguese coast, Poço do Barbarroxa de Baixo. Lithology, organic matter, biological proxies and high-resolution chronology provide ... -
Identification of the main driving mechanisms in the evolution of a small coastal wetland (Traba, Galicia, NW Spain) since its origin 5700 cal yr BP
Bao, Roberto; Alonso, Ángela; Delgado, Cristina; Pagés, Jose Luis (Elsevier, 2007)This paper examines the interdependence among the different forcing factors in the evolution of the Traba coastal wetland (Galicia, NW Spain) based on lithofacies and diatom analyses of three cores reaching the basement. ... -
Impact of the historical introduction of exotic fishes on the chironomid community of Lake Azul (Azores Islands)
Raposeiro, Pedro; Rubio, Maria Jesus; González, Alba; Hernández, Armand; Sánchez-López, Guiomar; Vázquez-Loureiro, David; Rull, Valentí; Bao, Roberto; Costa, Ana Cristina; Gonçalves, Vítor; Sáez, Alberto; Giralt, Santiago (Elsevier, 2017)Little is known about the effect of top predator introduction in historically fishless communities, especially on remote islands. This issue is important because it might strongly affect climate reconstructions derived from ... -
Lake-level and salinity reconstruction from diatom analyses in Quillagua formation (late Neogene, Central Andean forearc, northern Chile)
Bao, Roberto; Sáez, Alberto; Servant-Vildary, Simone; Cabrera, Lluı́s (Elsevier, 1999)A sedimentary and micropaleontological study of the Quillagua Formation provides a detailed paleohydrological reconstruction of the lacustrine system which occupied the present-day hyperarid Quillagua–Llamara fore-arc Basin ... -
Long-Term Hydroclimate Variability in the Sub-Tropical North Atlantic and Anthropogenic Impacts on Lake Ecosystems: A Case Study From Flores Island, the Azores
Richter, Nora; Russell, James M.; Amaral-Zettler, Linda; DeGroff, Wylie; Raposeiro, Pedro; Gonçalves, Vítor; Boer, Erik de; Pla-Rábes, Sergi; Hernández, Armand; Benavente Marín, Mario; Ritter, Catarina; Sáez, Alberto; Bao, Roberto; Trigo, R. M.; Prego, Ricardo; Giralt, Santiago (Elsevier, 2022-06-01)[Abstract] Human land use and climate change threaten ecosystems and natural resources, particularly on remote islands such as the Azores Archipelago in the North Atlantic. Since the official Portuguese settlement of the ... -
Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?
Prego, Ricardo; Carballeira, Rafael; Pazos, Yolanda; Bao, Roberto (MDPI, 2023-07-02)[Abstract] Harmful algal blooms are one of the leading causes of mortality in salmon aquaculture, with significant economic consequences. From 15 to 31 October 1996, a bloom of the skeletonized form of Octactis speculum ...