 |
| Titel |
A coarse resolution North Atlantic ocean circulation model: an intercomparison study with a paleoceanographic example |
| VerfasserIn |
Dan Seidov, Ralf Prien |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 2 ; Nr. 14, no. 2, S.246-257 |
| Datensatznummer |
250012174
|
| Publikation (Nr.) |
 copernicus.org/angeo-14-246-1996.pdf |
|
|
|
|
|
| Zusammenfassung |
| Paleoreconstructions suggest that during the
Last Glacial Maximum (LGM) the North Atlantic circulation was noticeably
different from its present state. However, the glacial salt conveyor belt is
believed to be similar to the present-day's conveyor, albeit weaker and
shallower because of an increased freshwater flux in high-latitudes. We present
here the investigation of the conveyor operation based on ocean circulation
modelling using two numerical models in parallel. The GFDL primitive equation
model and a planetary geostrophic model are employed to address the problem of
the paleocirculation modelling in cases of uncertain and sparse data comprising
the glacial surface boundary conditions. The role of different simplifications
that may be used in the ocean climate studies, including the role of grid
resolution, bottom topography, coast-line, etc., versus glacial-interglacial
changes of the ocean surface climatology is considered. The LGM reverse conveyor
gyre appeared to be the most noticeable feature of the glacial-to-interglacial
alteration of the ocean circulation. The reversed upper-ocean conveyor, weaker
and subducting 'normal' conveyor in the intermediate depths, and the change of
the deep-ocean return flow route are robust signatures of the glacial North
Atlantic climate. The results are found to be 'model-independent' and fairly
insensitive to all factors other than the onset of the glacial surface
conditions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|