Circulation patterns in the North Atlantic and possible impact on population dynamics ofCalanus finmarchicus

Ophelia ◽  
1996 ◽  
Vol 44 (1-3) ◽  
pp. 7-28 ◽  
Author(s):  
D. L. Aksnes ◽  
J. Blindheim
Keyword(s):  
Population Dynamics ◽  
North Atlantic ◽  
The North ◽  
Circulation Patterns ◽  
The North Atlantic

Deep water circulation patterns in the Atlantic during MISs 12-11

2020 ◽  
Author(s):  
Jasmin M. Link ◽  
Norbert Frank
Keyword(s):  
North Atlantic ◽  
Deep Water ◽  
Glacial Maximum ◽  
Water Circulation ◽  
Water Masses ◽  
Overturning Circulation ◽  
The Past ◽  
The North ◽  
Circulation Patterns ◽  
The North Atlantic

<p>Glacial Termination V is one of the most extreme glacial-interglacial transitions of the past 800 ka [1]. However, the changes in orbital forcing from Marine Isotope Stage (MIS) 12 to 11 are comparatively weak. In addition, MIS 11c is exceptionally distinct compared to other interglacials with for example a longer duration [2] and a higher-than-present sea level [3] despite a relative low incoming insolation. Therefore, the term “MIS 11 paradox” was coined [4]. However, only little is known about the Atlantic overturning circulation during this time interval [e.g. 5,6].</p><p>Here, we present Atlantic-wide deep water circulation patterns spanning the glacial maximum of MIS 12, Termination V, and MIS 11. Therefore, sediment cores throughout the Atlantic were analyzed regarding their Nd isotopic composition of authigenic coatings to reconstruct the provenance of the prevailing bottom water masses.</p><p>During the glacial maximum of MIS 12, the deep Atlantic Ocean was bathed with a higher amount of southern sourced water compared to the following interglacial. Termination V is represented by a sharp transition in the high-accumulating sites from the North Atlantic with a switch to northern sourced water masses. MIS 11 is characterized through an active deep water formation in the North Atlantic with active overflows from the Nordic Seas, only disrupted by a short deterioration. A strong export of northern sourced water masses to the South Atlantic points to an overall strong overturning circulation.</p><p> </p><p>[1] Lang and Wolff 2011, Climate of the Past 7: 361-380.</p><p>[2] Candy et al. 2014, Earth-Science Reviews 128: 18-51.</p><p>[3] Dutton et al. 2015, Science 349: aaa4019.</p><p>[4] Berger and Wefer 2003, Geophysical Monograph 137: 41-60.</p><p>[5] Dickson et al. 2009, Nature Geoscience 2: 428-433.</p><p>[6] Vázquez Riveiros et al. 2013, EPSL 371-372: 258-268.</p>

Conodont biostratigraphy and faunal assemblages in radiolarian ribbon-banded cherts of the Burubaital Formation, West Balkhash Region, Kazakhstan

2004 ◽  
Vol 141 (6) ◽  
pp. 699-715 ◽  
Author(s):  
TATIANA TOLMACHEVA ◽  
LARS HOLMER ◽  
LEONID POPOV ◽  
IVAN GOGIN
Keyword(s):  
North Atlantic ◽  
Primary Productivity ◽  
High Fertility ◽  
Faunal Assemblages ◽  
The North ◽  
Circulation Patterns ◽  
Bottom Waters ◽  
The North Atlantic ◽  
Conodont Fauna ◽  
West Balkhash Region

Biostratigraphical study of the early to mid-Ordovician conodont fauna from ribbon-banded radiolarian cherts of the middle Burubaital Formation in Central Kazakhstan reveals an almost complete succession of conodont biozones from the late Tremadocian to the early Darriwilian. During this interval, biosiliceous sediments were deposited in basinal environments, inhabited by lingulate brachiopods, sponges, pterobranchs and caryocaridids in conditions of high fertility and primary productivity of surface water. The community structure of taxonomically diverse conodont assemblages typifying open oceanic environments is not significantly different from that of epicratonic basins of the North Atlantic conodont province. The regional increase of oxygenated bottom waters at the base of the Oepikodus evae Biozone is possibly related to considerable changes in palaeo-oceanographical circulation patterns. The finds of three natural clusters of Prioniodus oepiki (McTavish) enable us to propose an emended diagnosis of this species.

Phylogeography and population dynamics of the white-sided dolphin (Lagenorhynchus acutus) in the North Atlantic

2014 ◽  
Vol 15 (4) ◽  
pp. 789-802 ◽  
Author(s):  
E. Banguera-Hinestroza ◽  
P. G. H. Evans ◽  
L. Mirimin ◽  
R. J. Reid ◽  
B. Mikkelsen ◽  
...  
Keyword(s):  
Population Dynamics ◽  
North Atlantic ◽  
The North ◽  
The North Atlantic ◽  
Lagenorhynchus Acutus

scholarly journals Quantifying Differences in Circulation Patterns Based on Probabilistic Models: IPCC AR4 Multimodel Comparison for the North Atlantic*

2010 ◽  
Vol 23 (24) ◽  
pp. 6573-6589 ◽  
Author(s):  
Henning W. Rust ◽  
Mathieu Vrac ◽  
Matthieu Lengaigne ◽  
Benjamin Sultan
Keyword(s):  
Climate Change ◽  
North Atlantic ◽  
General Circulation ◽  
Gaussian Mixture ◽  
Reanalysis Data ◽  
Shape Information ◽  
Size And Shape ◽  
The North ◽  
Circulation Patterns ◽  
The North Atlantic

Abstract The comparison of circulation patterns (CPs) obtained from reanalysis data to those from general circulation model (GCM) simulations is a frequent task for model validation, downscaling of GCM simulations, or other climate change–related studies. Here, the authors suggest a set of measures to quantify the differences between CPs. A combination of clustering using Gaussian mixture models with a set of related difference measures allows for taking cluster size and shape information into account and thus provides more information than the Euclidean distances between cluster centroids. The characteristics of the various distance measures are illustrated with a simple simulated example. Subsequently, a five-component Gaussian mixture to define circulation patterns for the North Atlantic region from reanalysis data and GCM simulations is used. CPs are obtained independently for the NCEP–NCAR reanalysis and the 40-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40), as well as for twentieth-century simulations from 14 GCMs of the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) database. After discussing the difference of CPs based on spherical and nonspherical clusters for the reanalysis datasets, the authors give a detailed evaluation of the cluster configuration for two GCMs relative to NCEP–NCAR. Finally, as an illustration, the capability of reproducing the NCEP–NCAR probability density function (pdf) defining the Greenland anticyclone CP is evaluated for all 14 GCMs, considering that the size and shape of the underlying pdfs complement the commonly used Euclidean distance of CPs’ mean values.

scholarly journals The North Atlantic Ocean's Missing Heat Is Found in Its Depths

Eos ◽  
2016 ◽  
Vol 97 ◽  
Author(s):  
Cody Sullivan
Keyword(s):  
North Atlantic ◽  
The North ◽  
Circulation Patterns ◽  
The North Atlantic

In the 2000s, the North Atlantic stopped absorbing as much atmospheric warmth. However, the ocean lost only a little heat—the rest was held deeper below the surface by altered circulation patterns.

Sign in / Sign up

Export Citation Format

Share Document