Preprints
https://doi.org/10.5194/essd-2025-555
https://doi.org/10.5194/essd-2025-555
01 Oct 2025
 | 01 Oct 2025
Status: this preprint is currently under review for the journal ESSD.

Long-term sea surface temperature time series from Malin Head, Ireland

Sarah Daves, Guy Westbrook, Glenn Nolan, Rob Thomas, and Eoghan Daly

Abstract. A 67-year, ongoing Sea Surface Temperature time series from Malin Head, in the north of Ireland, has been developed from data collected by Met Éireann and the Marine Institute. Over the course of the time-series, multiple measurement methodologies, sampling frequencies, and sub-site positions have been used for different periods. Resulting from this, two separate datasets have been created and publicised for usage, the quality controlled full-resolution measurement dataset (https://doi.org/10.20393/85D35444-2FB3-4791-A977-AE29BB3B3CFC; Marine Institute, 2025b), and a standardised daily average dataset (https://doi.org/10.20393/314DE8E2-79F0-4D36-B2BE-EE2A7E5590E2; Marine Institute, 2025a), the latter of which has undergone various processing steps, including removal of a diurnal signal. The standardised dataset creates and will continue a valuable, longstanding continuous time series which allows for more simplified long-term trend analysis compared with observation collections, which differ in measurement types and frequencies. The Malin Head sea surface temperature data, alongside a co-located tide gauge dataset are instrumental in understanding coastal ocean climate change in the region. Both datasets included are made available through the Marine Institute's Data Catalogue, have been assigned DOIs, and are made available from the Marine Institute's ERDDAP service.

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Sarah Daves, Guy Westbrook, Glenn Nolan, Rob Thomas, and Eoghan Daly

Status: open (until 07 Nov 2025)

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Sarah Daves, Guy Westbrook, Glenn Nolan, Rob Thomas, and Eoghan Daly

Data sets

Malin Head Sea Surface Temperature data collection, from 1958 to near-present Marine Institute https://erddap.marine.ie/erddap/tabledap/climate_malin.html

Malin Head Sea Surface Temperature daily averaged product, from 1958 to near-present Marine Institute https://erddap.marine.ie/erddap/tabledap/climate_malin_daily_average.html

Sarah Daves, Guy Westbrook, Glenn Nolan, Rob Thomas, and Eoghan Daly
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Short summary
This paper presents two datasets coming from a 67-year ongoing sea surface temperature time series from Malin Head, Ireland: a full-resolution measured dataset and a standardised data product. The latter of which has been stitched together from different measurement techniques and frequencies to make a more continuous and consistent time series. They have been used in a range of scientific papers to date and an annual warming trend of 0.015–0.022 °C has been found from the data.
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