Abstract. A regional ocean general circulation model of the Mediterranean is used to study the climate of the Last Glacial Maximum. The atmospheric forcing for these simulations has been derived from simulations with an atmospheric general circulation model, which in turn was forced with surface conditions from a coarse resolution earth system model. The model is successful in reproducing the general patterns of reconstructed sea surface temperature anomalies with the strongest cooling in summer in the northwestern Mediterranean and weak cooling in the Levantine, although the model underestimates the extent of the summer cooling in the western Mediterranean. However, there is a strong vertical gradient associated with this pattern of summer cooling, which makes the comparison with reconstructions complicated. The exchange with the Atlantic is decreased to roughly one half of its present value, which can be explained by the shallower Strait of Gibraltar as a consequence of lower global sea level. This reduced exchange causes a strong increase of salinity in the Mediterranean in spite of reduced net evaporation.
Modeling Mediterranean Ocean climate of the Last Glacial Maximum
Published 2010 in Climate of The Past
ABSTRACT
PUBLICATION RECORD
- Publication year
2010
- Venue
Climate of The Past
- Publication date
2010-10-01
- Fields of study
Geology, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- atlantic exchange
Water exchange between the Mediterranean Sea and the Atlantic Ocean through the Gibraltar gateway.
Aliases: exchange with the Atlantic
- last glacial maximum
The late Pleistocene cold-climate interval targeted by the simulations.
Aliases: LGM
- mediterranean regional ocean general circulation model
A regional ocean circulation model configured for the Mediterranean Sea.
Aliases: Mediterranean ocean general circulation model, regional Mediterranean ocean model
- net evaporation
The net freshwater loss from the Mediterranean surface budget after accounting for gains and losses.
- reconstructed sea surface temperature anomalies
Proxy-based estimates of sea surface temperature departures used for comparison with the model.
Aliases: SST anomalies, reconstructions
- salinity
The salt concentration of Mediterranean seawater simulated by the model.
- strait of gibraltar
The narrow marine passage connecting the Mediterranean Sea and the Atlantic Ocean.
Aliases: Gibraltar Strait
- vertical gradient
A change in water properties with depth across the simulated Mediterranean water column.
REFERENCES
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