The role of climate, marine influence and sedimentation rates in late-Holocene estuarine evolution (SW Portugal)/ (Record no. 12813)
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Personal name | Costa, Ana Maria |
245 ## - TITLE STATEMENT | |
Title | The role of climate, marine influence and sedimentation rates in late-Holocene estuarine evolution (SW Portugal)/ |
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
Name of publisher, distributor, etc | Sage, |
Date of publication, distribution, etc | 2019. |
300 ## - PHYSICAL DESCRIPTION | |
Pages | Vol 29, issue 4, 2019 : (622-632 p.). |
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Summary, etc | Estuaries are sensitive to changes in global to regional sea level, to climate-driven variation in rainfall and to fluvial discharge. In this study, we use source and environmentally sensitive proxies together with radiocarbon dating to examine a 7-m-thick sedimentary record from the Sado estuary accumulated throughout the last 3.6 kyr. The lithofacies, geochemistry and diatom assemblages in the sediments accumulated between 3570 and 3240 cal. BP indicate a mixture between terrestrial and marine sources. The relative contribution of each source varied through time as sedimentation progressed in a low intertidal to high subtidal and low-energy accreting tidal flat. The sedimentation proceeded under a general pattern of drier and higher aridity conditions, punctuated by century-long changes of the rainfall regime that mirror an increase in storminess that affected SW Portugal and Europe. The sediment sequence contains evidence of two periods characterized by downstream displacement of the estuarine/freshwater transitional boundary, dated to 3570–3400 cal. BP and 3300–3240 cal. BP. These are intercalated by one episode where marine influence shifted upstream. All sedimentation episodes developed under high terrestrial sediment delivery to this transitional region, leading to exceptionally high sedimentation rates, independently of the relative expression of terrestrial/marine influences in sediment facies. Our data show that these disturbances are mainly climate-driven and related to variations in rainfall and only secondarily with regional sea-level oscillations. From 3240 cal. BP onwards, an abrupt change in sediment facies is noted, in which the silting estuarine bottom reaches mean sea level and continued accreting until present under prevailing freshwater conditions, the tidal flat changing to an alluvial plain. The environmental modification is accompanied by a pronounced change in sedimentation rate that decreased by two orders of magnitude, reflecting the loss of accommodation space rather than the influence of climate or regional sea-level drivers. |
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Subject | climate variability, |
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Subject | environmental proxies, |
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Subject | fluvial discharge, |
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Subject | sea-level oscillation, |
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Subject | storminess |
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Added Entry Personal Name | Freitas, Maria da Conceição |
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Added Entry Personal Name | Leira, Manel |
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Added Entry Personal Name | Costas, Susana |
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Added Entry Personal Name | Costa, Pedro JM |
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Added Entry Personal Name | Andrade, César |
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Added Entry Personal Name | Bao, Roberto |
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Added Entry Personal Name | Duarte, João |
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Added Entry Personal Name | Rodrigues, Aurora |
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Added Entry Personal Name | Cachão, Mário |
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Added Entry Personal Name | Araújo, Ana Cristina |
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Added Entry Personal Name | Diniz, Mariana |
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Added Entry Personal Name | Arias, Pablo |
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Host Biblionumber | 12756 |
Host Itemnumber | 16504 |
Place, publisher, and date of publication | London: Sage Publication Ltd, 2019. |
Title | Holocene/ |
International Standard Serial Number | 09596836 |
856 ## - ELECTRONIC LOCATION AND ACCESS | |
Uniform Resource Identifier | https://doi.org/10.1177/0959683618824768 |
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Koha item type | Articles |
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