Giralt Romeu, Santiago

Giralt Romeu
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Personnel Group:
Scientific Staff
Environmental Geology and Geohazards, Head of Department
Research Group:
Environmental Changes in the Geological Record
U-Th Laboratory Scientific Director
Academic degree:





Educational Background


  • Ph.D., 1998, Geology, Universitat de Barcelona
  • B.Sc., 1992, Geology, Universitat de Barcelona


Research Interests


  • Reconstruction of paleoclimate changes and anthropogenic impacts using highresolution multiproxy study of lacustrine sediments.
  • Reconstruction of highfrequency climate phenomena, such as the North Atlantic Oscillation (NAO) and the El Niño Southern Oscillation (ENSO).
  • Statistical methods for isolating and characterizing paleoenvironmental signals (climate signals vs. tectonic, volcanic and/or anthropogenic signals).
  • Late Glacial and Holocene paleoenvironmental evolution of the Iberian Peninsula.
  • Sedimentary processes in lacustrine environments.
  • Uraniumseries disequilibrium (234U/230Th) dating method.



Publications 2017

Ballesteros, D., M. Jiménez-Sánchez, S. Giralt, I. DeFelipe, and J. García-Sansegundo (2017), Glacial origin for cave rhythmite during MIS 5d-c in a glaciokarst landscape, Picos de Europa (Spain), Geomorphology, 286, 68-77, doi:

Ballesteros, D., L. Rodríguez-Rodríguez, S. González-Lemos, S. Giralt, D. J. Álvarez-Lao, L. Adrados, and M. Jiménez-Sánchez (2017), New evidence of sea-level lowstands and paleoenvironment during MIS 6 and 4 in the Cantabrian coastal karst: The Cobiheru cave (North Iberia), Earth Surface Processes and Landforms, doi: 10.1002/esp.4115.

Frugone-Álvarez, M., et al. (2017), A 7000-year high-resolution lake sediment record from coastal central Chile (Lago Vichuquén, 34°S): implications for past sea level and environmental variability, Journal of Quaternary Science, n/a-n/a, doi: 10.1002/jqs.2936.

Rull, V., et al. (2017), Vegetation and landscape dynamics under natural and anthropogenic forcing on the Azores Islands: A 700-year pollen record from the São Miguel Island, Quaternary Science Reviews, 159, 155-168, doi:

2016 Publications

Aymerich, I. F., M. Oliva, S. Giralt, and J. Martín-Herrero (2016), Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging, PLoS ONE, 11(1), e0146578, doi: 10.1371/journal.pone.0146578.

Barreiro-Lostres, F., A. Moreno, P. González-Sampériz, S. Giralt, E. Nadal-Romero, and B. Valero-Garcés (2016), Erosion in Mediterranean mountain landscapes during the last millennium: A quantitative approach based on lake sediment sequences (Iberian Range, Spain), Catena, doi: 10.1016/j.catena.2016.05.024.

Burjachs, F., S. E. Jones, S. Giralt, and J. Fernández-López de Pablo (2016), Lateglacial to Early Holocene recursive aridity events in the SE Mediterranean Iberian Peninsula: The Salines playa lake case study, Quaternary International, 403, 187-200, doi: 10.1016/j.quaint.2015.10.117

Cañellas-Boltà, N., V. Rull, A. Sáez, O. Margalef, S. Pla-Rabes, B. Valero-Garcés, and S. Giralt (2016), Vegetation dynamics at Raraku Lake catchment (Easter Island) during the past 34,000 years, Palaeogeography, Palaeoclimatology, Palaeoecology, 446, 55-69, doi:10.1016/j.palaeo.2016.01.019.

Fierro, P. T., J. J. Kulemeyer, L. C. Lupo, and S. Giralt (2016), Environmental history of laguna seca, tartagal salta, Northwest Argentina, Revista Brasileira de Paleontologia, 19(2), 325-340, doi: 10.4072/rbp.2016.2.14.

Liu, E. J., M. Oliva, D. Antoniades, S. Giralt, I. Granados, S. Pla-Rabes, M. Toro, and A. Geyer (2016), Expanding the tephrostratigraphical framework for the South Shetland Islands, Antarctica, by combining compositional and textural tephra characterisation, Sedimentary Geology, 340, 49-61, doi: 10.1016/j.sedgeo.2015.08.002.

Oliva Franganillo, M., D. Antoniades, S. Giralt, I. Granados, S. Pla Rabes, M. Toro, and J. Sanjurjo (2016), La deglaciación de las áreas libres de hielo de las islas Shetland del Sur (Antártida). Ejemplos de Byers (Livingston) y Barton (King George), 2016, 14, doi: 10.17735/cyg.v30i1-2.48665.

Oliva, M., D. Antoniades, S. Giralt, I. Granados, S. Pla-Rabes, M. Toro, E. J. Liu, J. Sanjurjo, and G. Vieira (2016), The Holocene deglaciation of the Byers Peninsula (Livingston Island, Antarctica) based on the dating of lake sedimentary records, Geomorphology, 261, 89-102, doi:

Raposeiro, P. M., et al. (2017), Impact of the historical introduction of exotic fishes on the chironomid community of Lake Azul (Azores Islands), Palaeogeography, Palaeoclimatology, Palaeoecology, 466, 77-88, doi:

Rull, V., N. Cañellas-Boltà, O. Margalef, S. Pla-Rabes, A. Saez, and S. Giralt (2016), Three millennia of climatic, ecological and cultural change on Easter Island: an integrative overview, Frontiers in Ecology and Evolution, 4, doi: 10.3389/fevo.2016.00029.

Sánchez-López, G., et al. (2016), Climate reconstruction for the last two millennia in central Iberia: The role of East Atlantic (EA), North Atlantic Oscillation (NAO) and their interplay over the Iberian Peninsula, Quaternary Science Reviews, 149, 135-150, doi:

Publications 2015

Aranburu, A., M. Arriolabengoa, E. Iriarte, S. Giralt, I. Yusta, V. Martínez-Pillado, M. del Val, J. Moreno, and M. Jiménez-Sánchez (2015), Karst landscape evolution in the littoral area of the Bay of Biscay (north Iberian Peninsula), Quaternary International, 364, 217-230, doi: 10.1016/j.quaint.2014.09.025.

Ballesteros, D., M. Jiménez-Sánchez, S. Giralt, J. García-Sansegundo, and M. Meléndez-Asensio (2015), A multi-method approach for speleogenetic research on alpine karst caves. Torca La Texa shaft, Picos de Europa (Spain), Geomorphology, 247, 35-54, doi: 10.1016/j.geomorph.2015.02.026.

Bao, R., A. Hernández, A. Sáez, S. Giralt, R. Prego, J. J. Pueyo, A. Moreno, and B. L. Valero-Garcés (2015), Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake, Quaternary Science Reviews, 129, 96-110, doi: 10.1016/j.quascirev.2015.09.019.

Barreiro-Lostres, F., E. Brown, A. Moreno, M. Morellón, M. Abbott, A. Hillman, S. Giralt, and B. Valero-Garcés (2015), Sediment delivery and lake dynamics in a Mediterranean mountain watershed: Human-climate interactions during the last millennium (El Tobar Lake record, Iberian Range, Spain), Science of the Total Environment, 533, 506-519, doi: 10.1016/j.scitotenv.2015.06.123.

Burjachs, F., S. E. Jones, S. Giralt, and J. Fernández-López de Pablo (2015), Lateglacial to Early Holocene recursive aridity events in the SE Mediterranean Iberian Peninsula: The Salines playa lake case study, Quaternary International, doi: 10.1016/j.quaint.2015.10.117.

Hernández, A., R. M. Trigo, S. Pla-Rabes, B. L. Valero-Garcés, S. Jerez, M. Rico-Herrero, J. C. Vega, M. Jambrina-Enríquez, and S. Giralt (2015), Sensitivity of two Iberian lakes to North Atlantic atmospheric circulation modes, Climate Dynamics, 45(11-12), 3403-3417, doi: 10.1007/s00382-015-2547-8.

Liu, E. J., M. Oliva, D. Antoniades, S. Giralt, I. Granados, S. Pla-Rabes, M. Toro, and A. Geyer (2015), Expanding the tephrostratigraphical framework for the South Shetland Islands, Antarctica, by combining compositional and textural tephra characterisation, Sedimentary Geology, doi: 10.1016/j.sedgeo.2015.08.002.

Nieto-Moreno, V., F. Martínez-Ruiz, D. Gallego-Torres, D. Gallego-Torres, S. Giralt, J. García-Orellana, P. Masqué, P. Masqué, P. Masqué, J. S. Sinninghe Damsté, and M. Ortega-Huertas (2015), Palaeoclimate and palaeoceanographic conditions in the westernmost mediterranean over the last millennium: An integrated organic and inorganic approach, Journal of the Geological Society, 172(2), 264-271, doi: 10.1144/jgs2013-105.

Rejas, M., C. Taberner, J. J. Pueyo, S. Giralt, M. P. Mata, J. María de Gibert, and V. Díaz del Río (2015), Origin of carbonate concretions from mud mounds in the Gulf of Cadiz (SW Iberian Peninsula), Boletin Geologico y Minero, 126(2-3), 553-574.

Rull, V., N. Cañellas-Boltà, O. Margalef, A. Sáez, S. Pla-Rabes, and S. Giralt (2015a), Late Holocene vegetation dynamics and deforestation in Rano Aroi: Implications for Easter Island's ecological and cultural history, Quaternary Science Reviews, 126, 219-226, doi: 10.1016/j.quascirev.2015.09.008.

Sáez, A., S. Giralt, A. Hernández, R. Bao, J. J. Pueyo, A. Moreno, and B. L. Valero-Garcés (2015), Comment on "Climate in the Western Cordillera of the Central Andes over the last 4300 years", by Engel etal. (2014), Quaternary Science Reviews, 109, 126-130, doi: 10.1016/j.quascirev.2014.12.005.

Sánchez-López, G., A. Hernández, S. Pla-Rabes, M. Toro, I. Granados, J. Sigró, R. M. Trigo, M. J. Rubio-Inglés, L. Camarero, B. Valero-Garcés, and S. Giralt (2015), The effects of the NAO on the ice phenology of Spanish alpine lakes, Climatic Change, 130(2), 101-113, doi: 10.1007/s10584-015-1353-y.

Previous selected publications

Valero-Garcés, B., M. Morellón, A. Moreno, J. P. Corella, C. Martín-Puertas, F. Barreiro, A. Pérez, S. Giralt, and M. P. Mata-Campo (2014), Lacustrine carbonates of Iberian Karst Lakes: Sources, processes and depositional environments, Sedimentary Geology, 299, 1-29, doi: 10.1016/j.sedgeo.2013.10.007.

Barreiro-Lostres, F., A. Moreno, S. Giralt, and B. L. Valero-Garcés (2013), Sedimentary evolution of La Parra karstic lake (Cuenca) over the last 1600 years: Paleohydrology, climate, and human impact, Evolución sedimentaria del lago kárstico de La Parra (Cuenca) durante los últimos 1600 años: Paleohidrología, clima e impacto humano, 39(1), 179-193.

Cañellas-Boltà, N., V. Rull, A. Sáez, O. Margalef, R. Bao, S. Pla-Rabes, M. Blaauw, B. Valero-Garcés, and S. Giralt (2013), Vegetation changes and human settlement of Easter Island during the last millennia: A multiproxy study of the Lake Raraku sediments, Quaternary Science Reviews, 72, 36-48, doi: 10.1016/j.quascirev.2013.04.004.

Corella, J. P., V. Stefanova, A. El Anjoumi, E. Rico, S. Giralt, A. Moreno, A. Plata-Montero, and B. L. Valero-Garcés (2013), A 2500-year multi-proxy reconstruction of climate change and human activities in northern Spain: The Lake Arreo record, Palaeogeography, Palaeoclimatology, Palaeoecology, 386, 555-568, doi: 10.1016/j.palaeo.2013.06.022.

Hernández, A., R. Bao, S. Giralt, A. Sáez, M. J. Leng, P. A. Barker, C. P. Kendrick, and H. J. Sloane (2013), 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, Quaternary Science Reviews, 66, 64-73, doi: 10.1016/j.quascirev.2012.10.013.

Margalef, O., et al. (2013), A 70,000 year multiproxy record of climatic and environmental change from Rano Aroi peatland (Easter Island), Global and Planetary Change, 108, 72-84, doi: 10.1016/j.gloplacha.2013.05.016.

Nieto-Moreno, V., F. Martinez-Ruiz, S. Giralt, D. Gallego-Torres, J. García-Orellana, P. Masqué, and M. Ortega-Huertas (2013), Climate imprints during the 'Medieval Climate Anomaly' and the 'Little Ice Age' in marine records from the Alboran Sea basin, Holocene, 23(9), 1227-1237, doi: 10.1177/0959683613484613.

Toro, M., I. Granados, S. Pla, S. Giralt, D. Antoniades, L. Galán, A. M. Cortizas, H. S. Lim, and P. G. Appleby (2013), Chronostratigraphy of the sedimentary record of Limnopolar Lake, Byers Peninsula, Livingston Island, Antarctica, Antarctic Science, 25(2), 198-212, doi: 10.1017/S0954102012000788.

Bernárdez, P., R. Prego, S. Giralt, J. Esteve, M. Caetano, S. Parra, and G. Francés (2012), Geochemical and mineralogical characterization of surficial sediments from the Northern Rias: Implications for sediment provenance and impact of the source rocks, Marine Geology, 291-294, 63-72, doi: 10.1016/j.margeo.2011.11.003.

Cañellas-Boltà, N., V. Rull, A. Sáez, O. Margalef, S. Giralt, J. J. Pueyo, H. H. Birks, H. J. B. Birks, and S. Pla-Rabes (2012), Macrofossils in Raraku Lake (Easter Island) integrated with sedimentary and geochemical records: Towards a palaeoecological synthesis for the last 34,000 years, Quaternary Science Reviews, 34, 113-126, doi: 10.1016/j.quascirev.2011.12.013.

Gómez-Paccard, M., J. C. Larrasoaa, S. Giralt, and A. P. Roberts (2012), First paleomagnetic results of mid-to late Holocene sediments from Lake Issyk-Kul (Kyrgyzstan): Implications for paleosecular variation in central Asia, Geochemistry, Geophysics, Geosystems, 13(1), doi: 10.1029/2011GC004015.

Vegas-Vilarrúbia, T., J. Sigró, and S. Giralt (2012), Connection between El Niño-Southern Oscillation events and river nitrate concentrations in a Mediterranean river, Science of the Total Environment, 426, 446-453, doi: 10.1016/j.scitotenv.2012.03.079.

Ballesteros, D., M. Jiménez-Sánchez, J. García-Sansegundo, and S. Giralt (2011), Geological methods applied to speleogenetical research in vertical caves: The example of Torca Teyera shaft (Picos de Europa, northern Spain), Carbonates and Evaporites, 26(1), 29-40, doi: 10.1007/s13146-011-0052-7.

Colonese, A. C., E. Camarós, E. Verdún, J. Estévez, S. Giralt, and M. Rejas (2011), Integrated archaeozoological research of shell middens: New insights into hunter-gatherer-fisher coastal exploitation in Tierra del Fuego, Journal of Island and Coastal Archaeology, 6(2), 235-254, doi: 10.1080/15564894.2011.586088.

Corella, J. P., A. Moreno, M. Morellón, V. Rull, S. Giralt, M. T. Rico, A. Pérez-Sanz, and B. L. Valero-Garcés (2011), Climate and human impact on a meromictic lake during the last 6,000 years (Montcortès Lake, Central Pyrenees, Spain), Journal of Paleolimnology, 46(3), 351-367, doi: 10.1007/s10933-010-9443-3.

Giralt, S., M. T. Rico-Herrero, J. C. Vega, and B. L. Valero-Garcés (2011), Quantitative climate reconstruction linking meteorological, limnological and XRF core scanner datasets: The Lake Sanabria case study, NW Spain, Journal of Paleolimnology, 46(3), 487-502, doi: 10.1007/s10933-011-9509-x.

Hernández, A., R. Bao, S. Giralt, P. A. Barker, M. J. Leng, H. J. Sloane, and A. Sáez (2011), Biogeochemical processes controlling oxygen and carbon isotopes of diatom silica in Late Glacial to Holocene lacustrine rhythmites, Palaeogeography, Palaeoclimatology, Palaeoecology, 299(3-4), 413-425, doi: 10.1016/j.palaeo.2010.11.020.

Larrasoaña, J. C., M. Gómez-Paccard, S. Giralt, and A. P. Roberts (2011), Rapid locking of tectonic magnetic fabrics in weakly deformed mudrocks, Tectonophysics, 507(1-4), 16-25, doi: 10.1016/j.tecto.2011.05.003.

Martín-Puertas, C., B. L. Valero-Garcés, M. P. Mata, A. Moreno, S. Giralt, F. Martínez-Ruiz, and F. Jiménez-Espejo (2011), Geochemical processes in a Mediterranean Lake: A high-resolution study of the last 4,000 years in Zoñar Lake, southern Spain, Journal of Paleolimnology, 46(3), 405-421, doi: 10.1007/s10933-009-9373-0.

Nieto-Moreno, V., F. Martínez-Ruiz, S. Giralt, F. Jiménez-Espejo, D. Gallego-Torres, M. Rodrigo-Gámiz, J. García-Orellana, M. Ortega-Huertas, and G. J. De Lange (2011), Tracking climate variability in the western Mediterranean during the Late Holocene: A multiproxy approach, Climate of the Past, 7(4), 1395-1414, doi: 10.5194/cp-7-1395-2011.

Rull, V., P. González-Sampériz, J. P. Corella, M. Morellón, and S. Giralt (2011), Vegetation changes in the southern Pyrenean flank during the last millennium in relation to climate and human activities: The Montcortès lacustrine record, Journal of Paleolimnology, 46(3), 387-404, doi: 10.1007/s10933-010-9444-2.

Giralt, S., L. Cabrera, and E. H. Gierlowski-Kordesch (2010), Paleolimnology, Palaeogeography, Palaeoclimatology, Palaeoecology, 294(1-2), 1-3, doi: 10.1016/j.palaeo.2010.05.030.

Giralt, S., and B. L. Valero-Garcés (2010), Paleolimnology, Journal of Quaternary Science, 25(7), 1049-1050, doi: 10.1002/jqs.1446.

Hernández, A., S. Giralt, R. Bao, A. Sáez, M. J. Leng, and P. A. Barker (2010), ENSO and solar activity signals from oxygen isotopes in diatom silica during late glacial-Holocene transition in central Andes (18°S), Journal of Paleolimnology, 44(2), 413-429, doi: 10.1007/s10933-010-9412-x.

Rull, V., N. Cañellas-Boltà, A. Sáez, S. Giralt, S. Pla, and O. Margalef (2010), Paleoecology of Easter Island: Evidence and uncertainties, Earth-Science Reviews, 99(1-2), 50-60, doi: 10.1016/j.earscirev.2010.02.003.

Sáez, A., B. L. Valero-Garcés, S. Giralt, A. Moreno, R. Bao, J. J. Pueyo, A. Hernández, and D. Casas (2009), Glacial to Holocene climate changes in the SE Pacific. The Raraku Lake sedimentary record (Easter Island, 27°S), Quaternary Science Reviews, 28(25-26), 2743-2759, doi: 10.1016/j.quascirev.2009.06.018.



























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