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Upper Ocean Climate of the Eastern Mediterranean Sea During the Holocene Insolation Maximum – a Model Study : Volume 7, Issue 3 (05/05/2011)

By Adloff, F.

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Book Id: WPLBN0003981737
Format Type: PDF Article :
File Size: Pages 53
Reproduction Date: 2015

Title: Upper Ocean Climate of the Eastern Mediterranean Sea During the Holocene Insolation Maximum – a Model Study : Volume 7, Issue 3 (05/05/2011)  
Author: Adloff, F.
Volume: Vol. 7, Issue 3
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Kucera, M., Mikolajewicz, U., Grimm, R., Maier-Reimer, E., Emeis, K., Adloff, F., & Schmiedl, G. (2011). Upper Ocean Climate of the Eastern Mediterranean Sea During the Holocene Insolation Maximum – a Model Study : Volume 7, Issue 3 (05/05/2011). Retrieved from http://www.ebooklibrary.org/


Description
Description: Max Planck Institute for Meteorology, Hamburg, Germany. Nine thousand years ago, the Northern Hemisphere experienced enhanced seasonality caused by an orbital configuration with a minimum of the precession index. To assess the impact of the Holocene Insolation Maximum (HIM) on the Mediterranean Sea, we use a regional ocean general circulation model forced by atmospheric input derived from global simulations. A stronger seasonal cycle is simulated in the model, which shows a relatively homogeneous winter cooling and a summer warming with well-defined spatial patterns, in particular a subsurface warming in the Cretan and Western Levantine areas.

The comparison between the SST simulated for the HIM and the reconstructions from planktonic foraminifera transfer functions shows a poor agreement, especially for summer, when the vertical temperature gradient is strong. However, a reinterpretation of the reconstructions is proposed, to consider the conditions throughout the upper water column. Such a depth-integrated approach accounts for the vertical range of preferred habitat depths of the foraminifera used for the reconstructions and strongly improves the agreement between modelled and reconstructed temperature signal. The subsurface warming is recorded by both model and proxies, with a light shift to the south in the model results.

The mechanisms responsible for the peculiar subsurface pattern are found to be a combination of enhanced downwelling and wind mixing due to strengthened Etesian winds, and enhanced thermal forcing due to the stronger summer insolation in the Northern Hemisphere. Together, these processes induce a stronger heat transfer from the surface to the subsurface during late summer in the Western Levantine; this leads to an enhanced heat piracy in this region.


Summary
Upper ocean climate of the Eastern Mediterranean Sea during the Holocene Insolation Maximum – a model study

Excerpt
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