Northern hemisphere atmospheric response to changes of atlantic ocean SST on decadal time scales: a GCM experiment

1990 ◽  
Vol 4 (3) ◽  
pp. 157-174 ◽  
Author(s):  
Andreas Hense ◽  
Rita Glowienka-Hense ◽  
Hans von Storch ◽  
Ursula Stähler
Keyword(s):  
Atlantic Ocean ◽  
Time Scales ◽  
Northern Hemisphere ◽  
Atmospheric Response

Atmospheric response to the North Atlantic Ocean variability on seasonal to decadal time scales

2012 ◽  
Vol 40 (9-10) ◽  
pp. 2311-2330 ◽  
Author(s):  
Guillaume Gastineau ◽  
Fabio D’Andrea ◽  
Claude Frankignoul
Keyword(s):  
Atlantic Ocean ◽  
Time Scales ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Atmospheric Response ◽  
Ocean Variability ◽  
The North ◽  
The North Atlantic

scholarly journals How Predictable Are the Arctic and North Atlantic Oscillations? Exploring the Variability and Predictability of the Northern Hemisphere

2018 ◽  
Vol 31 (3) ◽  
pp. 997-1014 ◽  
Author(s):  
Daniela I. V. Domeisen ◽  
Gualtiero Badin ◽  
Inga M. Koszalka
Keyword(s):  
Time Scales ◽  
Northern Hemisphere ◽  
North Atlantic ◽  
Prediction Models ◽  
The Arctic ◽  
Ensemble Prediction ◽  
Atmospheric Conditions ◽  
Short Term ◽  
The North ◽  
The North Atlantic Oscillation

ABSTRACT The North Atlantic Oscillation (NAO) and the Arctic Oscillation (AO) describe the dominant part of the variability in the Northern Hemisphere extratropical troposphere. Because of the strong connection of these patterns with surface climate, recent years have shown an increased interest and an increasing skill in forecasting them. However, it is unclear what the intrinsic limits of short-term predictability for the NAO and AO patterns are. This study compares the variability and predictability of both patterns, using a range of data and index computation methods for the daily NAO and AO indices. Small deviations from Gaussianity are found along with characteristic decorrelation time scales of around one week. In the analysis of the Lyapunov spectrum it is found that predictability is not significantly different between the AO and NAO or between reanalysis products. Differences exist, however, between the indices based on EOF analysis, which exhibit predictability time scales around 12–16 days, and the station-based indices, exhibiting a longer predictability of 18–20 days. Both of these time scales indicate predictability beyond that currently obtained in ensemble prediction models for short-term predictability. Additional longer-term predictability for these patterns may be gained through local feedbacks and remote forcing mechanisms for particular atmospheric conditions.

scholarly journals Dynamical Response of the Oceanic Eddy Field to the North Atlantic Oscillation: A Model–Data Comparison

2004 ◽  
Vol 34 (12) ◽  
pp. 2615-2629 ◽  
Author(s):  
Thierry Penduff ◽  
Bernard Barnier ◽  
W. K. Dewar ◽  
James J. O'Brien
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic Oscillation ◽  
Time Scales ◽  
North Atlantic ◽  
Distribution Model ◽  
Altimeter Data ◽  
Dynamical Response ◽  
The North ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

Abstract Observational studies have shown that in many regions of the World Ocean the eddy kinetic energy (EKE) significantly varies on interannual time scales. Comparing altimeter-derived EKE maps for 1993 and 1996, Stammer and Wunsch have mentioned a significant meridional redistribution of EKE in the North Atlantic Ocean and suggested the possible influence of the North Atlantic Oscillation (NAO) cycle. This hypothesis is examined using 7 yr of Ocean Topography Experiment (TOPEX)/Poseidon altimeter data and three ⅙°-resolution Atlantic Ocean model simulations performed over the period 1979–2000 during the French “CLIPPER” experiment. The subpolar–subtropical meridional contrast of EKE in the real ocean appears to vary on interannual time scales, and the model reproduces it realistically. The NAO cycle forces the meridional contrast of energy input by the wind. The analysis in this paper suggests that after 1993 the large amplitude of the NAO cycle induces changes in the transport of the baroclinically unstable large-scale circulation (Gulf Stream/North Atlantic Current) and, thus, changes in the EKE distribution. Model results suggest that NAO-like fluctuations were not followed by EKE redistributions before 1994, probably because NAO oscillations were weaker. Strong NAO events after 1994 were followed by gyre-scale EKE fluctuations with a 4–12-month lag, suggesting that complex, nonlinear adjustment processes are involved in this oceanic adjustment.

Atmospheric response to sea-surface temperature in the eastern equatorial Atlantic at quasi-biweekly time-scales

2013 ◽  
Vol 140 (682) ◽  
pp. 1700-1714 ◽  
Author(s):  
Gaëlle de Coëtlogon ◽  
Marion Leduc-Leballeur ◽  
Rémi Meynadier ◽  
Sophie Bastin ◽  
Moussa Diakhaté ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Time Scales ◽  
Sea Surface ◽  
Atmospheric Response ◽  
Equatorial Atlantic

A new isopod species from the abyssal South Pacific ocean: Eugerda gigantea sp. nov. (Isopoda: Asellota: Desmosomatidae)

1999 ◽  
Vol 79 (6) ◽  
pp. 1061-1067 ◽  
Author(s):  
Ja-Yang Park
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
Atlantic Ocean ◽  
Northern Hemisphere ◽  
South Pacific ◽  
First Record ◽  
The Other ◽  
Equatorial Atlantic ◽  
South Pacific Ocean ◽  
Equatorial Atlantic Ocean

The new species Eugerda gigantea sp. nov. is described from the abyssal of the equatorial eastern South Pacific. For the genus Eugerda this is the first record from the South Pacific ocean, the other known species of the genus occur in the northern hemisphere or the equatorial Atlantic ocean.

scholarly journals Increasing Knowledge of Biodiversity on the Orphan Seamount: A New Species of Tedania (Tedaniopsis) Dendy, 1924

2021 ◽  
Vol 8 ◽  
Author(s):  
Pilar Ríos ◽  
Javier Cristobo ◽  
Emily Baker ◽  
Lindsay Beazley ◽  
Timothy Culwick ◽  
...  
Keyword(s):  
New Species ◽  
Atlantic Ocean ◽  
Northern Hemisphere ◽  
Fisheries Management ◽  
External Morphology ◽  
Labrador Sea ◽  
Horizon 2020 ◽  
Additional Information ◽  
Northern Atlantic ◽  
A New Species

A new Tedania species (Porifera) was collect using remotely operated vehicles during the Canadian mission HUD2010-029 and the British RRS Discovery Cruise DY081, on the Orphan Seamount near the Orphan Knoll, northwest Atlantic, between 2999.88 and 3450.4 m depth. Orphan Knoll is an isolated, drowned continental fragment 550 km northeast Newfoundland in the Labrador Sea. This region is biologically rich and complex and in 2007, the regional fisheries management organization operating in the area regulated that no vessel shall engage in bottom-contact fishing activities until reviewed in 2020 with a review slated at the end of this year. Members of the genus Tedania are uncommon in the temperate northern hemisphere with only six species known previously: Tedania (Tedania) anhelans; Tedania (Tedania) pilarriosae; Tedania (Tedania) suctoria; Tedania (Tedania) urgorrii; Tedania (Tedaniopsis) gurjanovae; and Tedania (Tedaniopsis) phacellina. The particular features of the new sponge we describe are the very peculiar external morphology which is tree-like with dichotomous branching—a morphology not previously described in this subgenus; and the combination of spicules found: long styles, the typical tornotes of the subgenus and two sizes of onychaetes. Additional information is provided on other species of Tedaniopsis described from the Atlantic Ocean. Based on the characteristics reported, we propose a new species, Tedania (Tedaniopsis) rappi sp. nov. in honor of Prof. Hans Tore Rapp (1972–2020), University of Bergen, Norway, a renowned sponge taxonomist and coordinator of the Horizon 2020 SponGES project. The holotype of T. (T.) phacellinaTopsent, 1912 from the Azores, the only other northern Atlantic species in the subgenus Tedaniopsis, was reviewed for comparison.

Modelled atmospheric response to changes in Northern Hemisphere snow cover

1996 ◽  
Vol 13 (1) ◽  
pp. 25-34 ◽  
Author(s):  
D. J. Walland ◽  
I. Simmonds
Keyword(s):  
Snow Cover ◽  
Northern Hemisphere ◽  
Atmospheric Response

scholarly journals Pleistocene evolution: Northern hemisphere ice sheets and North Atlantic Ocean

1989 ◽  
Vol 4 (4) ◽  
pp. 353-412 ◽  
Author(s):  
W. F. Ruddiman ◽  
M. E. Raymo ◽  
D. G. Martinson ◽  
B. M. Clement ◽  
J. Backman
Keyword(s):  
Atlantic Ocean ◽  
Northern Hemisphere ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Ice Sheets

Warmth of the Subpolar North Atlantic Ocean During Northern Hemisphere Ice-Sheet Growth

Science ◽  
1979 ◽  
Vol 204 (4389) ◽  
pp. 173-175 ◽  
Author(s):  
W. F. RUDDIMAN ◽  
A. MCINTYRE
Keyword(s):  
Atlantic Ocean ◽  
Northern Hemisphere ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Ice Sheet
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