Browsing by Author "Giralt, Santiago"
Now showing items 1-18 of 18
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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 ... -
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 ... -
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 ... -
Geomorphology, Geoarchaeology, and Geochronology of the Upper Pleistocene Archaeological Site of El Olivo Cave (Llanera, Asturias, Northern Spain)
Sanjurjo-Sánchez, Jorge; Jordá Pardo, Jesús F.; Ballesteros, Daniel; Giralt, Santiago; Álvarez-Alonso, David; Andrés Herrero, María de; Carral González, Pilar; Hevia-Carrillo, Aitor; Jiménez Sánchez, M. (MDPI, 2023)[Abstract] El Olivo Cave (Pruvia de Arriba, Llanera, Asturias, Spain) is a small karst cave located in the Aboño River basin and formed in the Cretaceous limestone of the Mesozoic cover of the Cantabrian Mountains (north ... -
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 ... -
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 ... -
Recent Global Warming Induces the Coupling of Dissimilar Long-Term Sedimentary Signatures in Two Adjacent Volcanic Lakes (Azores Archipelago, Portugal)
Vázquez-Loureiro, David; Sáez, Alberto; Gonçalves, Vítor; Buchaca, Teresa; Hernández, Armand; Raposeiro, Pedro; Boer, Erik de; Masqué, Pere; Giralt, Santiago; Bao, Roberto (Elsevier, 2023-01-30)[Abstract] Paleoclimatological information derived from the study of lacustrine sedimentary records is not only biased by taphonomical processes but also by potential differences in the expression of climate variability ... -
The Timing of the Deglaciation in the Atlantic Iberian Mountains: Insights From the Stratigraphic Analysis of a Lake Sequence in Serra Da Estrela (Portugal)
Hernández, Armand; Sáez, Alberto; Santos, Ricardo N.; Rodrigues, Teresa; Martín-Puertas, Celia; Gil-Romera, Graciela; Abbott, Mark; Carballeira, Rafael; Costa, Pedro J. M.; Giralt, Santiago; Gomes, Sandra D.; Griffore, Melissa; Ibáñez-Insa, Jordi; Leira, Manel; Moreno, João; Naughton, Filipa; Oliveira, Dulce; Raposeiro, Pedro M.; Trigo, Ricardo M.; Vieira, Gonçalo; Ramos, Alexandre M. (Wiley, 2023-02-07)[Abstract] Understanding the environmental response to the last glacial termination in regions located in transitional climate zones such as the Atlantic Iberian mountains is crucial to estimate potential changes in regions ... -
The Vanishing and the Establishment of a New Ecosystem on an Oceanic Island: Anthropogenic Impacts With No Return Ticket
Ritter, Catarina; Gonçalves, Vítor; Pla-Rabes, Sergi; de Boer, Erik; Bao, Roberto; Sáez, Alberto; Hernández, Armand; Sixto, Marta; Richter, Nora; Benavente Marín, Mario; Prego, Ricardo; Giralt, Santiago; Raposeiro, Pedro (Elsevier, 2022-03-31)[Abstract] A multiproxy approach was applied to a sediment core retrieved from the deep crater Lake Funda, located in the middle of the North Atlantic Ocean on Flores Island, Azores archipelago (Portugal). The purpose of ... -
Towards a Digital Twin of the Earth System: Geo-Soft-CoRe, a Geoscientific Software & Code Repository
DeFelipe, Irene; Alcalde, Juan; Baykiev, Eldar; Bernal, Isabel; Boonma, Kittiphon; Carbonell, Ramón; Flude, Stephanie; Folch, Arnau; Fullea, Javier; García-Castellanos, Daniel; Geyer, Adelina; Giralt, Santiago; Hernández, Armand; Jiménez-Munt, Ivone; Kumar, Ajay; Llorens, María-Gema; Martí, Joan; Molina, Cecilia; Olivar-Castaño, Andrés; Parnell, Andrew; Schimmel, Martin; Torné, Montserrat; Ventosa, Sergi (Frontiers, 2022-04-26)[Abstract] The immense advances in computer power achieved in the last decades have had a significant impact in Earth science, providing valuable research outputs that allow the simulation of complex natural processes and ... -
Vegetation and landscape dynamics under natural and anthropogenic forcing on the Azores Islands: A 700-year pollen record from the São Miguel Island
Rull, Valentí; Lara, Arantza; Rubio-Inglés, María Jesús; Giralt, Santiago; Gonçalves, Vítor; Raposeiro, Pedro; Hernández, Armand; Sánchez-López, Guiomar; Vázquez-Loureiro, David; Bao, Roberto (Elsevier, 2017)