This volume summarizes the results of the MARGO international
working group, with the aim to develop an updated and harmonised
reconstruction of sea surface temperatures and sea-ice extent of
the Last Glacial Maximum oceans. The MARGO approach differs from
previous efforts by developing and consistently applying measures
of various aspects of reconstruction reliability, and by combining
faunal and geochemical proxies.
In 14 papers, the volume provides a comprehensive review of earlier
work and a series of new, proxy-specific reconstructions based on
census counts of planktonic foraminifera, diatoms, radiolaria and
dinoflagellate cysts as well as on Mg/Ca measurements in planktonic
foraminifera. The approach of harmonising the calibration and
application of different proxies is described in detail, various
paleothermometry techniques and their results are compared and the
challenge of treating sparsely sampled data as the basis for ocean
circulation models is addressed. The use of stable oxygen isotope
composition of foraminiferal shells as a proxy for past sea water
composition is comprehensively reassessed, and a new approach to
the transfer function paleothermometer is presented.
This volume represents a landmark contribution to the understanding
of ice-age oceanography as well as the proxies used to reconstruct
past ocean states. The results will form the basis for forcing and
validation of ocean circulation models.
* New regional reconstructions of Last Glacial Maximum ocean
temperatures and sea ice cover
* Compilation of new calibration and fossil datasets as well as
documentation of techniques and approaches to paleoenvironmental
reconstructions.
* Comparison of techniques, proxies and modelling approaches
General
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