Alejandro Cearreta
Dados Biográficos
| ID | 1542685 |
|---|---|
| NOME | Alejandro Cearreta |
| PRENOMES | Alejandro |
| SOBRENOME | Cearreta |
| ASSINATURA | CEARRETA A |
| AFILIAÇÕES | University of the Basque Country |
| ORCID | 0000-0003-0100-1454 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 21 |
| TOTAL DE CITAÇÕES | 412 |
| TOTAL COMO AUTOR | 21 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 2000 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2020 |
| ÍNDICE H | 5 |
Quaternary research in Spain
Recent coastal anthropogenic impact recorded in the Basque mud patch (southern Bay of Biscay shelf)
The Working Group on the Anthropocene
Scale and diversity of the physical technosphere
We assess the scale and extent of the physical technosphere, defined here as the summed material output of the contemporary human enterprise. It includes active urban, agricultural and marine components, used to sustain energy and material flow for current human life, and a growing residue layer, currently only in small part recycled back into the active component. Preliminary estimates suggest a technosphere mass of approximately 30 trillion ton…
The Anthropocene is functionally and stratigraphically distinct from the Holocene
Evidence of an Anthropocene epoch Humans are undoubtedly altering many geological processes on Earth—and have been for some time. But what is the stratigraphic evidence for officially distinguishing this new human-dominated time period, termed the “Anthropocene,” from the preceding Holocene epoch? Waters et al. review climatic, biological, and geochemical signatures of human activity in sediments and ice cores. Combined with deposits of new mater…
Accretion rates in coastal wetlands of the southeastern Gulf of California and their relationship with sea-level rise
Sea-level rise (SLR) is one of the most conspicuous examples of the environmental impact of recent climate change. Since SLR rates are not uniform around the planet, local and regional data are needed for proper adaptation plans. 210 Pb-dated sediment cores were analyzed to determine the trends of sediment accretion rates (SARs) at three tropical saltmarshes in the Estero de Urias lagoon (Gulf of California, Mexico), in order to estimate the SLR …
Holocene palaeoenvironmental evolution of the Ebro Delta (Western Mediterranean Sea)
Major Mediterranean deltas began to develop during a period between 8000 and 6000 yr BP when the rate of fluvial sediment input overtook the declining rate of sea-level rise. However, different authors have argued that the Ebro Delta primarily formed during the late Middle Ages as a consequence of increased anthropogenic pressure on its river basin and these arguments are supported by the scarcity of previous geological studies and available radi…
The geological cycle of plastics and their use as a stratigraphic indicator of the Anthropocene
Relative sea-level changes in the Basque coast (northern Spain, Bay of Biscay) during the Holocene and Anthropocene
Tribute to Lydia Zapata
Chemostratigraphic and lithostratigraphic signatures of the Anthropocene in estuarine areas from the eastern Cantabrian coast (N. Spain)
Quaternary of the Western Pyrenean region
Sand-spit accumulations at the mouths of the eastern Cantabrian estuaries
When did the Anthropocene begin? A mid-twentieth century boundary level is stratigraphically optimal
Colonization of the Americas, 'Little Ice Age' climate, and bomb-produced carbon
A recently published analysis by Lewis and Maslin (Lewis SL and Maslin MA (2015) Defining the Anthropocene. Nature 519: 171-180) has identified two new potential horizons for the Holocene−Anthropocene boundary: 1610 (associated with European colonization of the Americas), or 1964 (the peak of the excess radiocarbon signal arising from atom bomb tests). We discuss both of these novel suggestions, and consider that there is insufficient stratigraph…
Lateglacial and Holocene coastal evolution in the Minho estuary (N Portugal)
The absence of accurate sea-level index points in SW Europe has long precluded the development of Holocene sea-level curves and the correct understanding of tectonic activity. In order to understand the coastal evolution and the major drivers in the Minho area, Portugal, we have combined micropaleontological and sedimentological data, where the chronological framework is provided by 13 radiocarbon ages. The stratigraphic reconstruction is in agre…
Historical signature of Roman mining activities in the Bidasoa estuary (Basque Country, northern Spain)
Assessing the performance of a foraminifera-based transfer function to estimate sea-level changes in northern Portugal
We assessed the performance of a transfer function model for sea-level studies using salt-marsh foraminifera from two estuaries of northern Portugal. An independent data set of 12 samples and 13 sub-fossil samples from a core were used to evaluate if reconstructions and errors derived from current models are adequate. Initial transfer function models provided very strong results as indicated by cross-validation (component 2; r 2 = 0.80–0.82; RMSE…
Distribution of foraminifera in salt marshes along the Atlantic coast of SW Europe
Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 2
Benthic foraminiferal, ostracod, calcareous nannoplankton and diatom assemblages have been analysed from the 25.45 sedimentary succession of a borehole drilled in the Santo André lagoon (southwestern Portugal). The zones and subzones recognized according to their microfossil content have been used to define six palaeoenvironmental stages extending from the Lateglacial to the present. Stage A and the lower part of stage B (14.2 to 10.0 ka) represe…
AMS 14C dating of Holocene estuarine deposits
Benthic foraminiferal species were used to AMS date Holocene sediments adjacent to trangressive overlap boundaries (TOB) in two high-energy estuaries in northern Spain. It had previously been recognized that the foraminifera could be divided into indigenous and exotic components. Whereas it was known that the exotic forms had been transported into the estuaries from the adjacent inner shelf, it was assumed that the indigenous forms were in situ. …
When did the Anthropocene begin? A mid-twentieth century boundary level is stratigraphically optimal
The Working Group on the Anthropocene
The geological cycle of plastics and their use as a stratigraphic indicator of the Anthropocene
Scale and diversity of the physical technosphere
We assess the scale and extent of the physical technosphere, defined here as the summed material output of the contemporary human enterprise. It includes active urban, agricultural and marine components, used to sustain energy and material flow for current human life, and a growing residue layer, currently only in small part recycled back into the active component. Preliminary estimates suggest a technosphere mass of approximately 30 trillion ton…
Colonization of the Americas, 'Little Ice Age' climate, and bomb-produced carbon
A recently published analysis by Lewis and Maslin (Lewis SL and Maslin MA (2015) Defining the Anthropocene. Nature 519: 171-180) has identified two new potential horizons for the Holocene−Anthropocene boundary: 1610 (associated with European colonization of the Americas), or 1964 (the peak of the excess radiocarbon signal arising from atom bomb tests). We discuss both of these novel suggestions, and consider that there is insufficient stratigraph…
Historical signature of Roman mining activities in the Bidasoa estuary (Basque Country, northern Spain)
Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 2
Benthic foraminiferal, ostracod, calcareous nannoplankton and diatom assemblages have been analysed from the 25.45 sedimentary succession of a borehole drilled in the Santo André lagoon (southwestern Portugal). The zones and subzones recognized according to their microfossil content have been used to define six palaeoenvironmental stages extending from the Lateglacial to the present. Stage A and the lower part of stage B (14.2 to 10.0 ka) represe…
Holocene palaeoenvironmental evolution of the Ebro Delta (Western Mediterranean Sea)
Major Mediterranean deltas began to develop during a period between 8000 and 6000 yr BP when the rate of fluvial sediment input overtook the declining rate of sea-level rise. However, different authors have argued that the Ebro Delta primarily formed during the late Middle Ages as a consequence of increased anthropogenic pressure on its river basin and these arguments are supported by the scarcity of previous geological studies and available radi…
Accretion rates in coastal wetlands of the southeastern Gulf of California and their relationship with sea-level rise
Sea-level rise (SLR) is one of the most conspicuous examples of the environmental impact of recent climate change. Since SLR rates are not uniform around the planet, local and regional data are needed for proper adaptation plans. 210 Pb-dated sediment cores were analyzed to determine the trends of sediment accretion rates (SARs) at three tropical saltmarshes in the Estero de Urias lagoon (Gulf of California, Mexico), in order to estimate the SLR …
Lateglacial and Holocene coastal evolution in the Minho estuary (N Portugal)
The absence of accurate sea-level index points in SW Europe has long precluded the development of Holocene sea-level curves and the correct understanding of tectonic activity. In order to understand the coastal evolution and the major drivers in the Minho area, Portugal, we have combined micropaleontological and sedimentological data, where the chronological framework is provided by 13 radiocarbon ages. The stratigraphic reconstruction is in agre…
AMS 14C dating of Holocene estuarine deposits
Benthic foraminiferal species were used to AMS date Holocene sediments adjacent to trangressive overlap boundaries (TOB) in two high-energy estuaries in northern Spain. It had previously been recognized that the foraminifera could be divided into indigenous and exotic components. Whereas it was known that the exotic forms had been transported into the estuaries from the adjacent inner shelf, it was assumed that the indigenous forms were in situ. …
AMS 14C dating of Holocene estuarine deposits
Benthic foraminiferal species were used to AMS date Holocene sediments adjacent to trangressive overlap boundaries (TOB) in two high-energy estuaries in northern Spain. It had previously been recognized that the foraminifera could be divided into indigenous and exotic components. Whereas it was known that the exotic forms had been transported into the estuaries from the adjacent inner shelf, it was assumed that the indigenous forms were in situ. …
Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 2
Benthic foraminiferal, ostracod, calcareous nannoplankton and diatom assemblages have been analysed from the 25.45 sedimentary succession of a borehole drilled in the Santo André lagoon (southwestern Portugal). The zones and subzones recognized according to their microfossil content have been used to define six palaeoenvironmental stages extending from the Lateglacial to the present. Stage A and the lower part of stage B (14.2 to 10.0 ka) represe…
Distribution of foraminifera in salt marshes along the Atlantic coast of SW Europe
Assessing the performance of a foraminifera-based transfer function to estimate sea-level changes in northern Portugal
We assessed the performance of a transfer function model for sea-level studies using salt-marsh foraminifera from two estuaries of northern Portugal. An independent data set of 12 samples and 13 sub-fossil samples from a core were used to evaluate if reconstructions and errors derived from current models are adequate. Initial transfer function models provided very strong results as indicated by cross-validation (component 2; r 2 = 0.80–0.82; RMSE…
Lateglacial and Holocene coastal evolution in the Minho estuary (N Portugal)
The absence of accurate sea-level index points in SW Europe has long precluded the development of Holocene sea-level curves and the correct understanding of tectonic activity. In order to understand the coastal evolution and the major drivers in the Minho area, Portugal, we have combined micropaleontological and sedimentological data, where the chronological framework is provided by 13 radiocarbon ages. The stratigraphic reconstruction is in agre…
Historical signature of Roman mining activities in the Bidasoa estuary (Basque Country, northern Spain)
Relative sea-level changes in the Basque coast (northern Spain, Bay of Biscay) during the Holocene and Anthropocene
Tribute to Lydia Zapata
Chemostratigraphic and lithostratigraphic signatures of the Anthropocene in estuarine areas from the eastern Cantabrian coast (N. Spain)
Quaternary of the Western Pyrenean region
Sand-spit accumulations at the mouths of the eastern Cantabrian estuaries
When did the Anthropocene begin? A mid-twentieth century boundary level is stratigraphically optimal
Colonization of the Americas, 'Little Ice Age' climate, and bomb-produced carbon
A recently published analysis by Lewis and Maslin (Lewis SL and Maslin MA (2015) Defining the Anthropocene. Nature 519: 171-180) has identified two new potential horizons for the Holocene−Anthropocene boundary: 1610 (associated with European colonization of the Americas), or 1964 (the peak of the excess radiocarbon signal arising from atom bomb tests). We discuss both of these novel suggestions, and consider that there is insufficient stratigraph…
The Anthropocene is functionally and stratigraphically distinct from the Holocene
Evidence of an Anthropocene epoch Humans are undoubtedly altering many geological processes on Earth—and have been for some time. But what is the stratigraphic evidence for officially distinguishing this new human-dominated time period, termed the “Anthropocene,” from the preceding Holocene epoch? Waters et al. review climatic, biological, and geochemical signatures of human activity in sediments and ice cores. Combined with deposits of new mater…
Accretion rates in coastal wetlands of the southeastern Gulf of California and their relationship with sea-level rise
Sea-level rise (SLR) is one of the most conspicuous examples of the environmental impact of recent climate change. Since SLR rates are not uniform around the planet, local and regional data are needed for proper adaptation plans. 210 Pb-dated sediment cores were analyzed to determine the trends of sediment accretion rates (SARs) at three tropical saltmarshes in the Estero de Urias lagoon (Gulf of California, Mexico), in order to estimate the SLR …
Holocene palaeoenvironmental evolution of the Ebro Delta (Western Mediterranean Sea)
Major Mediterranean deltas began to develop during a period between 8000 and 6000 yr BP when the rate of fluvial sediment input overtook the declining rate of sea-level rise. However, different authors have argued that the Ebro Delta primarily formed during the late Middle Ages as a consequence of increased anthropogenic pressure on its river basin and these arguments are supported by the scarcity of previous geological studies and available radi…
The geological cycle of plastics and their use as a stratigraphic indicator of the Anthropocene
The Working Group on the Anthropocene
Scale and diversity of the physical technosphere
We assess the scale and extent of the physical technosphere, defined here as the summed material output of the contemporary human enterprise. It includes active urban, agricultural and marine components, used to sustain energy and material flow for current human life, and a growing residue layer, currently only in small part recycled back into the active component. Preliminary estimates suggest a technosphere mass of approximately 30 trillion ton…
Quaternary research in Spain
Recent coastal anthropogenic impact recorded in the Basque mud patch (southern Bay of Biscay shelf)
Geology (17 obras) · Geology and Paleoclimatology Research (14 obras) · Paleontology (14 obras) · Oceanography (11 obras) · Geography (10 obras) · Archaeology (9 obras) · Estuary (9 obras) · Ecology (8 obras) · Holocene (8 obras) · Anthropocene (6 obras)