Data repository for: Relative sea-level trends in southern Norway during the last millennium

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Holthuis, Max; Nixon, F. Chantel; Kylander, Malin E.; van der Bilt, Willem G.M.; Hong, Isabel; Joyse, Kristen M.; Lakeman, Thomas R.; Martin, Jake; Peter, Maria; Solheim Holme, Simon; Horton, Benjamin P., 2024, "Data repository for: Relative sea-level trends in southern Norway during the last millennium", https://doi.org/10.18710/QSGWSJ, DataverseNO, V4

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Description	This dataset contains all supplementary data for: Relative sea-level trends in southern Norway during the last millennium. It is organized as follows: - 01 - Tidal data October to December 2023 - 02 - Stable isotopes of surface transect and TV-1 - 03 - Salinity measurements of surface transect - 04 - Grain size TV-1 - 05 - LOI and DBD TV-2 - 06 - XRF and PCA TV-1 - 07 - Chronology TV-1 - 08 - Accretion rates TV-1 - 09 - All data vs modelled age - 10 - QAnalySeries inputs and results - 11 - Quantitative comparison data LOI and PC2 (2025-02-28) Geological reconstructions of relative sea-level (RSL) from southern Norway show falling RSL during the last 7000 cal. a BP, but tide gauge measurements document a slow RSL rise since at least 1960 CE. With an age gap of c. 1400 years between the youngest geologically-reconstructed sea-level index point (SLIP) and the installation of the Tregde tide gauge in southernmost Norway, the exact nature and timing of the onset of RSL rise in southern Norway remains unknown. To fill this gap, we collected peat cores from a salt marsh to reconstruct RSL trends over the past 1000 years using a multiproxy approach, including 210Pb and 14C dating, grain-size analysis, loss-on-ignition (LOI), geochemistry (stable carbon isotopes, carbon/nitrogen ratios and XRF) and diatoms. Our data suggest decreasing tidal current strength and salinity over most of the last millennium, suggesting falling RSL. Sediment geochemistry also appears to vary with wetter and drier climatic periods. An increase in marine-brackish diatoms in combination with an acceleration in sedimentation rates after 1930 CE (1899-1954 CE) suggest that the onset of RSL rise began around this time in southernmost Norway. While most of the proxy data appear to have delayed sensitivity to RSL changes and may be linked to other causal processes, they, nonetheless, provide valuable insight into the environmental response of high-latitude temperate salt marshes to slow rates of RSL change. (2025-02-28)
Subject	Earth and Environmental Sciences
Keyword	Late Holocene, relative sea level rise, salt marsh, southern Norway, stable isotopes of carbon and nitrogen, XRF
Related Publication	Submitted for review.
License/Data Use Agreement	CC0 1.0

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	00_Holthuis_DataverseNO_README.txt Plain Text - 45.1 KB Published Mar 3, 2025 29 Downloads MD5: f0d6def61de52aaaada3b0fda710ba31 Readme file for all the data repository	Preview "00_Holthuis_DataverseNO_README.txt" Access File File Access Public Download Options Plain Text Download Metadata Data File Citation EndNote XML RIS BibTeX
	01_Tidal_logger_data.csv Comma Separated Values - 2.3 MB Published Oct 13, 2024 31 Downloads MD5: dfe4429132b454e20133f9db61e64a6a Tidal logger data over the period of October 2023 - December 2023	Preview "01_Tidal_logger_data.csv" Access File File Access Public Download Options Comma Separated Values Download Metadata Data File Citation EndNote XML RIS BibTeX
	02_1_d13C_CN_TV-1.csv Comma Separated Values - 3.7 KB Published Oct 13, 2024 28 Downloads MD5: 7b0767b0b91c013d86574ad67b03f7c7 Stable isotopes of 13C and 15N and C/N data for core TV-1	Preview "02_1_d13C_CN_TV-1.csv" Access File File Access Public Download Options Comma Separated Values Download Metadata Data File Citation EndNote XML RIS BibTeX
	02_2_d13C_CN_transect_sed.csv Comma Separated Values - 3.2 KB Published Jan 19, 2025 28 Downloads MD5: 9612334859ff61d3a7ccf5a28492f3f8 Stable isotopes of 13C and 15N and C/N data the sediment samples of the salt marsh surface transect.	Preview "02_2_d13C_CN_transect_sed.csv" Access File File Access Public Download Options Comma Separated Values Download Metadata Data File Citation EndNote XML RIS BibTeX
	02_3_d13C_CN_transect_veg.csv Comma Separated Values - 2.1 KB Published Jan 19, 2025 29 Downloads MD5: 15ea559abbd51f44d8530846547d2faf Stable isotopes of 13C and 15N and C/N data the vegetation samples of the salt marsh surface transect.	Preview "02_3_d13C_CN_transect_veg.csv" Access File File Access Public Download Options Comma Separated Values Download Metadata Data File Citation EndNote XML RIS BibTeX
	02_4_pooled_stdev_calc.csv Comma Separated Values - 11.6 KB Published Oct 13, 2024 28 Downloads MD5: 416f9c81dab555aa98e29ba957b8f93b Pooled standard deviation calculations for the data in "02_1", "02_2" and "02_3".	Preview "02_4_pooled_stdev_calc.csv" Access File File Access Public Download Options Comma Separated Values Download Metadata Data File Citation EndNote XML RIS BibTeX
	03_salinity_transect.csv Comma Separated Values - 1.9 KB Published Oct 13, 2024 28 Downloads MD5: 64e48eb5cb4bf5ff5094d6ed31aa39b1 Transect of salinity measurements roughly corresponding the sediment and vegetation sample transect.	Preview "03_salinity_transect.csv" Access File File Access Public Download Options Comma Separated Values Download Metadata Data File Citation EndNote XML RIS BibTeX
	04_1_GS_TV-1_averages.csv Comma Separated Values - 48.2 KB Published Oct 13, 2024 28 Downloads MD5: 511052fd7a6f70f9d05c9e5cf662a4f8 The averages over 5 runs for each sample from core TV-1	Preview "04_1_GS_TV-1_averages.csv" Access File File Access Public Download Options Comma Separated Values Download Metadata Data File Citation EndNote XML RIS BibTeX
	04_2_GS_TV-1_Gradistat.csv Comma Separated Values - 51.5 KB Published Oct 13, 2024 28 Downloads MD5: 34388d53b86bb763ff119bfe49cc7c65 Grain size data after the averages of "04_1" have been processed with the Gradistat software	Preview "04_2_GS_TV-1_Gradistat.csv" Access File File Access Public Download Options Comma Separated Values Download Metadata Data File Citation EndNote XML RIS BibTeX
	04_3_GS_TV-1_Folk_Ward.csv Comma Separated Values - 11.0 KB Published Oct 13, 2024 28 Downloads MD5: b0a47af72c056fb4eede345d35d637eb Summary of the data from "04_2"	Preview "04_3_GS_TV-1_Folk_Ward.csv" Access File File Access Public Download Options Comma Separated Values Download Metadata Data File Citation EndNote XML RIS BibTeX

Citation Metadata

Persistent Identifier	doi:10.18710/QSGWSJ
Publication Date	2024-10-13
Title	Data repository for: Relative sea-level trends in southern Norway during the last millennium
Author	Holthuis, Max (NTNU – Norwegian University of Science and Technology) - ORCID: 0009-0003-7392-6162 Nixon, F. Chantel (NTNU – Norwegian University of Science and Technology) - ORCID: 0000-0002-6113-100X Kylander, Malin E. (Stockholm University) - ORCID: 0000-0001-8787-5069 van der Bilt, Willem G.M. (University of Bergen) - ORCID: 0000-0003-3157-451X Hong, Isabel (Villanova University) Joyse, Kristen M. (Earth Observatory of Singapore) - ORCID: 0000-0002-4965-8204 Lakeman, Thomas R. (Geological Survey of Norway (NGU)) - ORCID: 0000-0002-4518-5745 Martin, Jake (NTNU – Norwegian University of Science and Technology) - ORCID: 0000-0001-9544-9094 Peter, Maria (NTNU – Norwegian University of Science and Technology) Solheim Holme, Simon (NTNU – Norwegian University of Science and Technology) Horton, Benjamin P. (Earth Observatory of Singapore) - ORCID: 0000-0001-9245-3768
Point of Contact	Use email button above to contact. Holthuis, Max (NTNU – Norwegian University of Science and Technology)
Description	This dataset contains all supplementary data for: Relative sea-level trends in southern Norway during the last millennium. It is organized as follows: - 01 - Tidal data October to December 2023 - 02 - Stable isotopes of surface transect and TV-1 - 03 - Salinity measurements of surface transect - 04 - Grain size TV-1 - 05 - LOI and DBD TV-2 - 06 - XRF and PCA TV-1 - 07 - Chronology TV-1 - 08 - Accretion rates TV-1 - 09 - All data vs modelled age - 10 - QAnalySeries inputs and results - 11 - Quantitative comparison data LOI and PC2 (2025-02-28) Geological reconstructions of relative sea-level (RSL) from southern Norway show falling RSL during the last 7000 cal. a BP, but tide gauge measurements document a slow RSL rise since at least 1960 CE. With an age gap of c. 1400 years between the youngest geologically-reconstructed sea-level index point (SLIP) and the installation of the Tregde tide gauge in southernmost Norway, the exact nature and timing of the onset of RSL rise in southern Norway remains unknown. To fill this gap, we collected peat cores from a salt marsh to reconstruct RSL trends over the past 1000 years using a multiproxy approach, including 210Pb and 14C dating, grain-size analysis, loss-on-ignition (LOI), geochemistry (stable carbon isotopes, carbon/nitrogen ratios and XRF) and diatoms. Our data suggest decreasing tidal current strength and salinity over most of the last millennium, suggesting falling RSL. Sediment geochemistry also appears to vary with wetter and drier climatic periods. An increase in marine-brackish diatoms in combination with an acceleration in sedimentation rates after 1930 CE (1899-1954 CE) suggest that the onset of RSL rise began around this time in southernmost Norway. While most of the proxy data appear to have delayed sensitivity to RSL changes and may be linked to other causal processes, they, nonetheless, provide valuable insight into the environmental response of high-latitude temperate salt marshes to slow rates of RSL change. (2025-02-28)
Subject	Earth and Environmental Sciences
Keyword	Late Holocene relative sea level rise salt marsh southern Norway stable isotopes of carbon and nitrogen XRF
Related Publication	Submitted for review.
Language	English
Producer	NTNU – Norwegian University of Science and Technology (NTNU) https://www.ntnu.edu/
Contributor	Project Leader : Norges Geologiske Undersøkelse
Funding Information	Norges forskningsråd: 303594
Distributor	DataverseNO https://dataverse.no/
Depositor	Holthuis, Max
Deposit Date	2024-09-04
Time Period	Start Date: 990-01-01 ; End Date: 2023-12-23
Date of Collection	Start Date: 2018-09-17 ; End Date: 2024-01-30
Data Type	Survey data
Software	R, Version: 4.3.1 Bacon, Version: 3.1.1 Gradistat, Version: 9.1 SPSS, Version: 29.0.0.0 Excel, Version: 2407

Geospatial Metadata

Geographic Coverage	Norway, Agder, Tranevåg
Geographic Unit	populated place
Geographic Bounding Box	6.934304 6.953917 58.063123 58.050726

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