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| Registros recuperados: 14 | |
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| Petit, Tillys. |
| The Reykjanes Ridge is a major topographic feature of the North-Atlantic Ocean that extends from Iceland to the Charlie Gibbs Fracture Zone. Located between the Iceland Basin and the Irminger Sea, the Reykjanes Ridge strongly influences the subpolar gyre circulation and is a gate toward the deep convection areas. However, the circulation and distribution across the Reykjanes Ridge has never been directly quantified such that the characterization of the connection between the Iceland Basin and the Irminger Sea is still incomplete. As part of the Reykjanes Ridge Experiment project, we were able to analyze the circulation around, above and across the Reykjanes Ridge. Mainly based on hydrographic sections along and perpendicular to the ridge axis, the aim of... |
| Tipo: Text |
Palavras-chave: Gyre subpolaire Nord-Atlantique; Bathymétrie; Masses d’eau; North-Atlantic; Subpolar gyre; Bathymetry; Water masses; Circulation; Observations. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00498/60969/64377.pdf |
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| Landschuetzer, Peter; Ilyina, Tatiana; Lovenduski, Nicole S.. |
| We use a neural network-based estimate of the sea surface partial pressure of CO2 (pCO(2)) derived from measurements assembled within the Surface Ocean CO2 Atlas to investigate the dominant modes of pCO(2) variability from 1982 through 2015. Our analysis shows that detrended and deseasonalized sea surface pCO(2) varies substantially by region and the respective frequencies match those from the major modes of climate variability (Atlantic Multidecadal Oscillation, Pacific Decadal Oscillation, multivariate ENSO index, Southern Annular Mode), suggesting a climate modulated air-sea exchange of CO2. We find that most of the regional pCO(2) variability is driven by changes in the ocean circulation and/or changes in biology, whereas the North Atlantic variability... |
| Tipo: Text |
Palavras-chave: Ocean; CO2; Variability; Carbon; Climate; Observations. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00675/78733/80972.pdf |
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| Petit, Tillys; Mercier, Herle; Thierry, Virginie. |
| The Reykjanes Ridge is a major topographic feature located south of Iceland in the North‐Atlantic Ocean that strongly influences the subpolar gyre (SPG) circulation. Based on velocity and hydrographic measurements carried out along the crest of the Reykjanes Ridge from the Icelandic continental shelf to 50°N during the RREX cruise in June – July 2015, we derived the first direct estimates of volume and water mass transports over the Reykjanes Ridge. North of 53.15°N, circulation was mainly westward; south of this latitude it was mainly eastward. The westward transport was estimated at 21.9 ± 2.5 Sv (Sv = 106 m3 s‐1) and represents the SPG intensity. The westward flows followed two main pathways at 57°N near the Bight Fracture Zone and at 59 – 62°N. We... |
| Tipo: Text |
Palavras-chave: North Atlantic subpolar gyre; Bathymetry; Water masses; Circulation; Observations. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56604/58296.pdf |
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| Desbruyeres, D.g.; Mcdonagh, E. L.; King, B. A.; Garry, F. K.; Blaker, A. T.; Moat, B. I.; Mercier, Herle. |
| The vertical structure of temperature trends in the northeastern Atlantic (NEA) is investigated using a blend of Argo and hydrography data. The representativeness of sparse hydrography sampling in the basin mean is assessed using a numerical model. Between 2003 and 2013, the NEA underwent a strong surface cooling (0–450 m) and a significant warming at intermediate and deep levels (1000 m to 3000 m) that followed a strong cooling trend observed between 1988 and 2003. During 2003–2013, gyre-specific changes are found in the upper 1000 m (warming and cooling of the subtropical and subpolar gyres, respectively), while the intermediate and deep warming primarily occurred in the subpolar gyre, with important contributions from isopycnal heave and water mass... |
| Tipo: Text |
Palavras-chave: North Atlantic; Temperature; Observations; Hiatus. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00236/34677/33026.pdf |
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| Meinen, Christopher S.; Speich, Sabrina; Piola, Alberto R.; Ansorge, Isabelle; Campos, Edmo; Kersale, Marion; Terre Terrillon, Thierry; Chidichimo, Maria Paz; Lamont, Tarron; Sato, Olga T.; Perez, Renellys C.; Valla, Daniel; Van Den Berg, Marcel; Le Henaff, Matthieu; Dong, Shenfu; Garzoli, Silvia L.. |
| Six years of simultaneous moored observations near the western and eastern boundaries of the South Atlantic are combined with satellite winds to produce a daily time series of the basin-wide meridional overturning circulation (MOC) volume transport at 34.5 degrees S. The results demonstrate that barotropic and baroclinic signals at both boundaries cause significant transport variations, and as such must be concurrently observed. The data, spanning similar to 20 months during 2009-2010 and similar to 4 years during 2013-2017, reveal a highly energetic MOC record with a temporal standard deviation of 8.3 Sv, and strong variations at time scales ranging from a few days to years (peak-to-peak range = 54.6 Sv). Seasonal transport variations are found to have... |
| Tipo: Text |
Palavras-chave: Meridional overturning circulation; South Atlantic; Overturning; Volume transport; Observations. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00445/55612/57253.pdf |
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| Da-allada, Casimir Yelognisse; Gaillard, Fabienne; Kolodziejczyk, Nicolas. |
| The mixed-layer salinity (MLS) budget in the tropical Indian Ocean is estimated from a combination of satellite products and in situ observations over the 2004-2012 period, to investigate the mechanisms controlling the seasonal MLS variability. In contrast with previous studies in the tropical Indian Ocean, our results reveal that the coverage, resolution, and quality of available observations are now sufficient to approach a closed monthly climatology seasonal salt budget. In the South-central Arabian Sea and South-western Tropical Indian Ocean (SCAS and STIO, respectively), where seasonal variability of the MLS is pronounced, the monthly MLS tendency terms are well captured by the diagnostic. In the SCAS region, in agreement with previous results, the... |
| Tipo: Text |
Palavras-chave: Tropical Indian Ocean; Observations; Seasonal cycle; Mixed-layer salinity; Mixed-layer budget. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00270/38129/36311.pdf |
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| De Mey-frémaux, Pierre; Ayoub, Nadia; Barth, Alexander; Brewin, Robert; Charria, Guillaume; Campuzano, Francisco; Ciavatta, Stefano; Cirano, Mauro; Edwards, Christopher A.; Federico, Ivan; Gao, Shan; Garcia Hermosa, Isabel; Garcia Sotillo, Marcos; Hewitt, Helene; Hole, Lars Robert; Holt, Jason; King, Robert; Kourafalou, Villy; Lu, Youyu; Mourre, Baptiste; Pascual, Ananda; Staneva, Joanna; Stanev, Emil V.; Wang, Hui; Zhu, Xueming. |
| Integration of observations of the coastal ocean continuum, from regional oceans to shelf seas and estuaries/deltas with models, can substantially increase the value of observations and enable a wealth of applications. In particular, models can play a critical role at connecting sparse observations, synthesizing them, and assisting the design of observational networks; in turn, whenever available, observations can guide coastal model development. Coastal observations should sample the two-way interactions between nearshore, estuarine and shelf processes and open ocean processes, while accounting for the different pace of circulation drivers, such as the fast atmospheric, hydrological and tidal processes and the slower general ocean circulation and climate... |
| Tipo: Text |
Palavras-chave: Coastal; Ocean; Observations; Models; Synergy; Synthesis; Assimilation; Array design. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00508/61961/66050.pdf |
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| Petit, Tillys; Mercier, Herle; Thierry, Virginie. |
| The Reykjanes Ridge strongly influences the circulation of the North Atlantic Subpolar Gyre as it flows to the Irminger Sea from the Iceland Basin. The circulation is composed of two main along‐ridge currents: the southwestward East Reykjanes Ridge Current (ERRC) in the Iceland Basin and the northeastward Irminger Current (IC) in the Irminger Sea. To study their interconnection through the ridge, as well as their connections with the interior of each basin, velocity and hydrological measurements were carried out along and perpendicular to the crest of the Reykjanes Ridge in June–July 2015 as part of the RREX project. This new dataset changes our view of the ERRC and IC as it reveals undocumented along‐stream evolutions of their hydrological properties,... |
| Tipo: Text |
Palavras-chave: North-Atlantic Subpolar Gyre; Bathymetry; Oceanic circulation; Observations. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00591/70347/68407.pdf |
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| Ritter, R.; Landschuetzer, P.; Gruber, N.; Fay, A. R.; Iida, Y.; Jones, S.; Nakaoka, S.; Park, G. -h.; Peylin, P.; Roedenbeck, C.; Rodgers, K. B.; Shutler, J. D.; Zeng, J.. |
| The Southern Ocean (SO) carbon sink has strengthened substantially since the year 2000, following a decade of a weakening trend. However, the surface ocean pCO(2) data underlying this trend reversal are sparse, requiring a substantial amount of extrapolation to map the data. Here we use nine different pCO(2) mapping products to investigate the SO trends and their sensitivity to the mapping procedure. We find a robust temporal coherence for the entire SO, with eight of the nine products agreeing on the sign of the decadal trends, that is, a weakening CO2 sink trend in the 1990s (on average 0.22 0.24pgCyr(-1)decade(-1)), and a strengthening sink trend during the 2000s (-0.35 0.23pgCyr(-1)decade(-1)). Spatially, the multiproduct mean reveals rather uniform... |
| Tipo: Text |
Palavras-chave: Southern Ocean; CO2; Observations; SOCOM; Trends; Carbon sink. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00662/77387/79013.pdf |
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| Robson, Jon; Sutton, Rowan T.; Archibald, Alex; Cooper, Fenwick; Christensen, Matthew; Gray, Lesley J.; Holliday, N. Penny; Macintosh, Claire; Mcmillan, Malcolm; Moat, Ben; Russo, Maria; Tilling, Rachel; Carslaw, Ken; Desbruyeres, Damien; Embury, Owen; Feltham, Daniel L.; Grosvenor, Daniel P.; Josey, Simon; King, Brian; Lewis, Alastair; Mccarthy, Gerard D.; Merchant, Chris; New, Adrian L.; O'Reilly, Christopher H.; Osprey, Scott M.; Read, Katie; Scaife, Adam; Shepherd, Andrew; Sinha, Bablu; Smeed, David; Smith, Doug; Ridout, Andrew; Woollings, Tim; Yang, Mingxi. |
| Major changes are occurring across the North Atlantic climate system, including in the atmosphere, ocean and cryosphere, and many observed changes are unprecedented in instrumental records. As the changes in the North Atlantic directly affect the climate and air quality of the surrounding continents, it is important to fully understand how and why the changes are taking place, not least to predict how the region will change in the future. To this end, this article characterizes the recent observed changes in the North Atlantic region, especially in the period 2005–2016, across many different aspects of the system including: atmospheric circulation; atmospheric composition; clouds and aerosols; ocean circulation and properties; and the cryosphere. Recent... |
| Tipo: Text |
Palavras-chave: Atmosphere; Atmospheric composition; Cryosphere; Observations; Ocean; North atlantic. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56606/58298.pdf |
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| Landschuetzer, P.; Gruber, N.; Bakker, D. C. E.; Schuster, U.. |
| We present a new observation-based estimate of the global oceanic carbon dioxide (CO2) sink and its temporal variation on a monthly basis from 1998 through 2011 and at a spatial resolution of 1 degrees x1 degrees. This sink estimate rests upon a neural network-based mapping of global surface ocean observations of the partial pressure of CO2 (pCO(2)) from the Surface Ocean CO2 Atlas database. The resulting pCO(2) has small biases when evaluated against independent observations in the different ocean basins, but larger randomly distributed differences exist particularly in high latitudes. The seasonal climatology of our neural network-based product agrees overall well with the Takahashi et al. (2009) climatology, although our product produces a stronger... |
| Tipo: Text |
Palavras-chave: Sea surface pCO(2); Neural network; Air-sea exchange of CO2; Ocean carbon cycle; Observations. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00292/40345/38920.pdf |
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| Smith, Shawn R.; Alory, Gaël; Andersson, Axel; Asher, William; Baker, Alex; Berry, David I.; Drushka, Kyla; Figurskey, Darin; Freeman, Eric; Holthus, Paul; Jickells, Tim; Kleta, Henry; Kent, Elizabeth C.; Kolodziejczyk, Nicolas; Kramp, Martin; Loh, Zoe; Poli, Paul; Schuster, Ute; Steventon, Emma; Swart, Sebastiaan; Tarasova, Oksana; Petit De La Villeon, Loic; Vinogradova-shiffer, Nadya. |
| The role ships play in atmospheric, oceanic, and biogeochemical observations is described with a focus on measurements made near the ocean surface. Ships include merchant and research vessels; cruise liners and ferries; fishing vessels; coast guard, military, and other government-operated ships; yachts; and a growing fleet of automated surface vessels. The present capabilities of ships to measure essential climate/ocean variables and the requirements from a broad community to address operational, commercial, and scientific needs are described. The authors provide a vision to expand observations needed from ships to understand and forecast the exchanges across the ocean–atmosphere interface. The vision addresses (1) recruiting vessels to improve both... |
| Tipo: Text |
Palavras-chave: Ships; Observations; Meteorology; Physical oceanography; Biogeochemistry; Data management; Climatology. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00509/62042/66191.pdf |
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| Registros recuperados: 14 | |
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