Results 61 to 70 of about 76,119 (230)

A pilot variational coupled reanalysis based on the CESAM climate model

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Variational data assimilation of in‐situ and satellite ocean data and reanalysis atmospheric data into an intermediate complexity Earth system model is possible by adjusting the surface fluxes and internal model parameters. This pilot application requires nearly complete information on the atmospheric state for synchronization.
Armin Köhl, Iuliia Polkova, Guokun Lyu, Frank Lunkeit, Abhirup Banerjee, Silke Schubert, Detlef Stammer   +6 more
wiley   +1 more source

The retroflection of part of the East Greenland Current at Cape Farewell [PDF]

, 2007
The East Greenland Current (EGC) and the smaller East Greenland Coastal Current (EGCC) provide the major conduit for cold fresh polar water to enter the lower latitudes of the North Atlantic.
Amélie Meyer, Bacon, Bacon, Beverly de Cuevas, Clarke, Cuny, Dijkstra, Egbert, Egbert, Hansen, Holliday, Lavender, Lherminier, Marsh, Matano, Munday, N. Penny Holliday, Pickart, Rudels, Sheldon Bacon, Steven G. Alderson, Visbeck, Wilkinson   +22 more
core   +1 more source

Exceptionally poor and good medium‐range forecasts of the large‐scale circulation over Europe in ERA5 reforecasts

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study investigates year‐round exceptionally poor and good day‐6 forecasts of the 500‐hPa geopotential height field over Europe using 45 years of ERA5 reforecasts and applies a weather regime perspective to analyse large‐scale pattern evolution and regime transitions.
Seraphine Hauser, Steven M. Cavallo, Linus Magnusson, Jonathan E. Martin, David B. Parsons   +4 more
wiley   +1 more source

Modulation of North Atlantic atmospheric rivers by the Gulf Stream

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Gulf Stream ocean variability plays a key role in modulating atmospheric river (AR) activity over the North Atlantic during winter and spring at monthly time‐scales. Increased ocean heat transport and mesoscale activity in the Gulf Stream are linked to northward shifts in ARs, while stronger surface heat fluxes drive ARs southward.
Ferran Lopez‐Marti, Arnaud Czaja, Gabriele Messori, Anna Rutgersson   +3 more
wiley   +1 more source

Polar‐low track prediction using machine‐learning methods

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Machine‐learning models are developed to produce reliable and efficient forecasts of polar‐low (PL) trajectories 12 hours ahead. A temporal model (RLSTM) benefiting from the rolling‐forecast strategy, improves overall prediction accuracy and is suitable for quick experimentation, while a spatiotemporal model (PL‐UNet), incorporating both historical and
Ziying Yang, Rune Grand Graversen, Filippo Maria Bianchi, Jiping Liu, Ruibo Lei   +4 more
wiley   +1 more source

Estimates of the abundance of cetaceans in the central North Atlantic based on the NASS Icelandic and Faroese shipboard surveys conducted in 2015

NAMMCO Scientific Publications, 2019
The North Atlantic Sightings Survey (NASS), the sixth in a series of surveys conducted between 1987 and 2015, was conducted in June/July 2015 and covered a large area of the northern North Atlantic.
Daniel Pike, Thorvaldur Gunnlaugsson, Bjarni Mikkelsen, Sverrir D. Halldórsson, Gísli Víkingsson   +4 more
doaj   +1 more source

Diagnosing the 11‐year solar cycle's influence on the East Atlantic pattern

Quarterly Journal of the Royal Meteorological Society, EarlyView.
A previously unidentified solar‐cycle response in the East Atlantic pattern is found in late winter at lag +3 years with larger amplitude than the NAO response. A statistically significant NAO response to the solar cycle is seen in late winter at lag 0 years.
Stergios Misios, Paula L. M. Gonzalez, Lesley J. Gray, Scott Osprey, Hedi Ma   +4 more
wiley   +1 more source

Accumulation rates during 1311--2011~CE in North Central Greenland derived from air-borne radar data

Frontiers in Earth Science, 2016
Radar–detected internal layering contains information on past accumulation rates and patterns. In this study, we assume that the radar layers are isochrones, and use the layer stratigraphy in combination with ice-core measurements and numerical methods ...
Nanna Bjørnholt Karlsson, Nanna Bjørnholt Karlsson, Olaf Eisen, Olaf Eisen, Dorthe Dahl-Jensen, Johannes Freitag, Sepp Kipfstuhl, Cameron Lewis, Cameron Lewis, Lisbeth Tangaa Nielsen, John D. Paden, Anna Winter, Frank Wilhelms, Frank Wilhelms   +13 more
doaj   +1 more source

A multimodel intercomparison study of variable‐resolution global models with grid refinement over the Arctic and Antarctic

Quarterly Journal of the Royal Meteorological Society, EarlyView.
We document the protocol and first results from the first ever coordinated multimodel variable‐resolution experiment set with refinement over the polar regions. We find that the refinement generally yields model‐dependent effects. The most consistent improvement is an amelioration of the upper‐level cold bias in the polar regions that translates into ...
Lise Seland Graff, Dörthe Handorf, Raphael Köhler, Xavier Levine, René R. Wijngaard, Gareth J. Marshall, Alexey Yu. Karpechko, Ryan S. Williams, Priscilla A. Mooney   +8 more
wiley   +1 more source

Decline and northward shift in Arctic cod distribution associated with the changing climate around Greenland

Arctic Science
Arctic cod (Boreogadus saida Lepechin, 1774) is a key species in Arctic marine ecosystems, acting as a dominant mid-trophic link that transfers up to 75% of energy to higher trophic levels. It is therefore central to cultural identity, ecosystem function,
Teunis Jansen, Søren Post, Rikke Becker Jacobsen, Karl Michael Werner, Eva Friis Møller, Aqqalu Rosing-Asvid, AnnDorte Burmeister, Anna Burdenski, Mathane Qatsa, Caroline Bouchard   +9 more
doaj   +1 more source