Data rescue process in the context of sea level reconstructions: An overview of the methodology, lessons learned, up‐to‐date best practices and recommendations

Latapy, Alexa; Ferret, Yann; Testut, Laurent; Talke, Stefan A.; Aarup, Thorkild; Pons, Frédéric; Jan, Gwénaële; Bradshaw, Elizabeth; Pouvreau, Nicolas

doi:10.1002/gdj3.179

Cited by 6 publications

(4 citation statements)

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“…fr/dataRescue, last access: 30 June 2023); 70 % of those have already been rescued (e.g. scanned), but many remain undigitized (Latapy et al, 2022). Given the time-critical risk of losing this valuable scientific and historic information, it is crucial to urgently rescue these datasets, digitize them, and make them available to the scientific community.…”

Section: Discussionmentioning

confidence: 99%

“…The overall process of digitizing ledgers and charts was time-consuming, which is a known characteristic of this kind of data archaeology exercise (Latapy et al, 2022). This is an obvious consequence of manually digitizing the ledgers from scanned documents to a spreadsheet table, but it is a less obvious consequence of the digitization of charts, which is a software-based extraction.…”

Section: Scanning and Digitizationmentioning

confidence: 99%

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Extension of a high temporal resolution sea level time series at Socoa (Saint-Jean-de-Luz, France) back to 1875

Khan,

Van Den Beld,

Wöppelmann

et al. 2023

Earth Syst. Sci. Data

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Abstract. In this data paper, the sea level time series at Socoa (Saint-Jean-de-Luz, southwestern France) is extended through a data archaeology exercise. We conducted a comprehensive study of national and local archives to catalogue water level records stored in ledgers (handwritten record books) and charts (marigrams from mechanical float gauges), along with other associated documents (metadata). A dedicated effort was undertaken to preserve more than 2000 documents by archiving them in digital formats. Using this large set of rescued documents, the Socoa time series has been extended back to 1875, with more than 58 station-years of additional data. The final time series has hourly sampling, while the raw dataset has a finer sampling frequency of up to 5 min. By analysing precise levelling information, we assessed the continuity of the vertical datum. We also compared the new century-long time series to nearby tide gauge data to ensure its datum consistency. While the overall quality of the time series is generally good, siltation of the stilling well has occasionally affected certain parts of the record. We have successfully identified these impacted periods and flagged the corresponding data as doubtful. This extended high-resolution sea level time series at Socoa, spanning more than 100 years, will be valuable for advancing climate research, particularly when studying the decadal-scale variations in the North Atlantic and investigating the storminess and extreme events along the French Basque coast. The raw digitized water level, the processed dataset, metadata, and the python notebooks used for processing are available at https://doi.org/10.5281/zenodo.7438469 (Khan et al., 2022).

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Section: Discussionmentioning

confidence: 99%

Section: Scanning and Digitizationmentioning

confidence: 99%

Extension of a high temporal resolution sea level time series at Socoa (Saint-Jean-de-Luz, France) back to 1875

Khan,

Van Den Beld,

Wöppelmann

et al. 2023

Earth Syst. Sci. Data

Self Cite

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show abstract

“…This also includes updating metadata related to tidal gauges, which is indispensable 460 for accurately reconstructing and interpretating observed sea level, for instance related to vertical land movement (e.g. Latapy et al, 2023).…”

Section: Discussionmentioning

confidence: 99%

Sea Level Rise in Europe: Knowledge gaps identified through a participatory approach

Jiménez,

Bonaduce,

Depuydt

et al. 2023

Preprint

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Abstract. The Intergovernmental Panel on Climate Change (IPCC) plays a pivotal role in delivering information and knowledge on sea level rise (SLR), a global threat impacting coastlines worldwide. However, considerable disparities still persist in Europe in understanding and applying sea level science, evaluating its repercussions, and devising effective adaptation strategies. These are influenced by local factors such as diverse environments, socioeconomic conditions, policy contexts, and diversity in stakeholder involvement, producing in turn varying knowledge gaps and information needs across European sea basins. In this context, this paper presents the findings of a comprehensive scoping process carried out by the European Knowledge Hub on Sea Level Rise (KH-SLR) to define the outline of the first KH-SLR Assessment Report. It consists of the analysis of stakeholder responses to an online survey and insights shared during four regional workshops, aiming to pinpoint critical gaps in available information on SLR and its potential consequences in European basins, both from a scientific and policy perspective. The analysis was divided into three categories: i) SLR science and information, ii) SLR impacts, and iii) SLR adaptation policies and decision-making. Regarding SLR science and information, many respondents found that significant gaps exist in regional SLR projections and uncertainties, particularly related to long-term SLR induced by potential melting of large icesheets. Interestingly, the perspective on information gaps is different for scientists (emphasizing the need to increase regional projection capabilities) and government users (stressing the availability of accurate projections for their regions). Regarding impacts and hazards, shoreline erosion stands out as a dominant concern in all basins except the Arctic, while emerging issues like saltwater intrusion and the role of SLR in compound risks associated with extreme water levels and river flow were also given significant regional relevance. With regards to policy and decision making, existing adaptation plans are perceived as ineffective and lacking adaptability, with gaps related to underestimated impacts and urban planning. Participants, especially end-users, emphasized the relevance of improved information dissemination and communication to support informed decision-making.

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“…Instantaneous residuals are highly sensitive to temporal shifts in observations. The authors identify several artificial over-and undershoots that can be attributed solely to the time lags between flood and ebb (Fossi, 2022;Latapy et al 2023). Therefore, a detailed analysis of residual water levels and currents was conducted during High Water Springs (HWS), Higher High Water (HHW), Lower…”

Section: Instantaneous Anomalies In Water Levels and Currents At Zigu...mentioning

confidence: 99%

The Influence of tidal distortion on extreme water levels in Casamance estuary, Senegal.

Diouf,

Sakho,

Sow

et al. 2024

Preprint

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The Casamance estuary in Senegal is experiencing hypersalination and silting, which are negatively impacting its mangrove ecosystem and maritime navigation. This is a critical issue for both biodiversity preservation and economic development. However, research and documentation on this estuary, particularly with regard to tides, have been relatively neglected. The focus of this study is on the impact of tidal asymmetry on extreme water levels in the region. Tide data was collected at the river entrance and at Ziguinchor, and analysed using digital tools such as Tide Peaks Toolbox and UTide. The results indicate that the average tidal range at Ziguinchor varies from 33 cm to 65 cm, with peaks in February and March and troughs in January and March. The duration of the ebb tide varies, with a duration of over 4 hours during spring tides and 2 hours during neap tides. During the dry season, the duration is extended to 3 hours and 30 minutes, leading to a greater accumulation of water upstream of the estuary, particularly in July. Maximum velocities of up to 30 cm/s are observed at the start of high tide, mainly in February. Harmonic analysis conducted over a six-month period indicates a reduction in amplitude of over 45% for semi-diurnal and diurnal waves. Additionally, there is a significant amplification of the upper diurnal waves, with a more asymmetry upstream of the estuary. Additionally, the analysis of residual water levels and currents emphasizes the complexity of tidal dynamics, particularly due to non-tidal influences. This study constitutes a good contribution to the understanding of the hydrodynamic functioning of estuarine systems in West Africa marked by a strong climatic contrast.

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Data rescue process in the context of sea level reconstructions: An overview of the methodology, lessons learned, up‐to‐date best practices and recommendations

Cited by 6 publications

References 123 publications

Extension of a high temporal resolution sea level time series at Socoa (Saint-Jean-de-Luz, France) back to 1875

Extension of a high temporal resolution sea level time series at Socoa (Saint-Jean-de-Luz, France) back to 1875

Sea Level Rise in Europe: Knowledge gaps identified through a participatory approach

The Influence of tidal distortion on extreme water levels in Casamance estuary, Senegal.

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