An ensemble reconstruction of global monthly sea surface temperature and sea ice concentration 1000–1849

Samakinwa, Eric; Valler, Veronika; Hand, Ralf; Neukom, Raphael; Gómez-Navarro, Juan José; Kennedy, John; Rayner, Nick A.; Brönnimann, Stefan (2021). An ensemble reconstruction of global monthly sea surface temperature and sea ice concentration 1000–1849. Scientific data, 8(1) Nature Publishing Group 10.1038/s41597-021-01043-1

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This paper describes a global monthly gridded Sea Surface Temperature (SST) and Sea Ice Concentration (SIC) dataset for the period 1000 – 1849, which can be used as boundary conditions for atmospheric model simulations. The reconstruction is based on existing coarse-resolution annual temperature ensemble reconstructions, which are then augmented with intra-annual and sub-grid scale variability. The intra-annual component of HadISST.2.0 and oceanic indices estimated from the reconstructed annual mean are used to develop grid-based linear regressions in a monthly stratified approach. Similarly, we reconstruct SIC using analog resampling of HadISST.2.0 SIC (1941 – 2000), for both hemispheres. Analogs are pooled in four seasons, comprising of 3-months each. The best analogs are selected based on the correlation between each member of the reconstructed SST and its target. For the period 1780 to 1849, we assimilate historical observations of SST and night-time marine air temperature from the ICOADS dataset into our reconstruction using an offline Ensemble Kalman Filter approach. The resulting dataset is physically consistent with information from models, proxies, and observations.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Climatology
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography

UniBE Contributor:

Samakinwa, Eric Kayode; Valler, Veronika; Hand, Ralf and Brönnimann, Stefan

Subjects:

500 Science > 550 Earth sciences & geology
900 History > 910 Geography & travel

ISSN:

2052-4463

Publisher:

Nature Publishing Group

Funders:

[18] European Research Council

Projects:

[UNSPECIFIED] PALAEO-RA

Language:

English

Submitter:

Eric Kayode Samakinwa

Date Deposited:

22 Oct 2021 13:41

Last Modified:

24 Oct 2021 03:27

Publisher DOI:

10.1038/s41597-021-01043-1

BORIS DOI:

10.48350/159905

URI:

https://boris.unibe.ch/id/eprint/159905

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