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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/cp-2019-154
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-154
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  19 Feb 2020

19 Feb 2020

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This preprint is currently under review for the journal CP.

A global climatology of the ocean surface during the Last Glacial Maximum mapped on a regular grid (GLOMAP)

André Paul1, Stefan Mulitza1, Rüdiger Stein2, and Martin Werner2 André Paul et al.
  • 1MARUM – Center for Marine Environmental Sciences and Department of Geosciences, University of Bremen, Bremen, Germany
  • 2Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), Bremerhaven, Germany

Abstract. We present a climatology of the sea-surface temperature (SST) anomaly and the sea-ice extent during the Last Glacial Maximum (LGM, 23 000–19 000 years before present) mapped on a global regular 1° × 1° grid. It is an extension of the Glacial Atlantic Ocean Mapping (GLAMAP) reconstruction of the Atlantic SST based on the results of the Multiproxy Approach for the Reconstruction of the Glacial Ocean Surface (MARGO) project and several recent estimates of the LGM sea-ice extent. Such a gridded climatology is highly useful for the visualization of the LGM climate, calculation of global and regional SST averages and estimation of the equilibrium climate sensitivity, as well as a boundary condition for atmospheric general circulation models. The gridding of the sparse SST reconstruction was done in an optimal way using the Data-Interpolating Variational Analysis (DIVA) software, which takes into account the uncertainty on the reconstruction and includes the calculation of an error field. The resulting Glacial Ocean Map (GLOMAP) confirmed the previous findings by the MARGO project regarding longitudinal and meridional SST differences that were greater than today in all oceans and an equilibrium climate sensitivity at the lower end of the currently accepted range.

André Paul et al.

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André Paul et al.

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Latest update: 05 Aug 2020
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Short summary
We present monthly maps of sea-surface temperature and sea-ice extent during the Last Glacial Maximum (23 000–19 000 years before present), which are based on the analysis of ocean sediment cores. They allow for visualizing the past climate state, calculating global and regional mean changes and estimating a value of climate sensitivity, which is at the lower end of the currently accepted range. We plan to use these maps as a boundary condition for testing atmospheric general circulation models.
We present monthly maps of sea-surface temperature and sea-ice extent during the Last Glacial...
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