Consulta: subjectFacets:"In situ measurements"
Registros recuperados: 8
Data/hora: 02/06/2024 00:48:23

Ocean Climate Observing Requirements in Support of Climate Research and Climate Information
Provedor de dados: 5
Autores: Stammer, Detlef; Bracco, Annalisa; Achutarao, Krishna; Beal, Lisa; Bindoff, Nathaniel L.; Braconnot, Pascale; Cai, Wenju; Chen, Dake; Collins, Matthew; Danabasoglu, Gokhan; Dewitte, Boris; Farneti, Riccardo; Fox-kemper, Baylor; Fyfe, John; Griffies, Stephen M.; Jayne, Steven R.; Lazar, Alban; Lengaigne, Matthieu; Lin, Xiaopei; Marsland, Simon; Minobe, Shoshiro; Monteiro, Pedro M. S.; Robinson, Walter; Roxy, Mathew Koll; Rykaczewski, Ryan R.; Speich, Sabrina; Smith, Inga J.; Solomon, Amy; Storto, Andrea; Takahashi, Ken; Toniazzo, Thomas; Vialard, Jerome.
Natural variability and change of the Earth's climate have significant global societal impacts. With its large heat and carbon capacity and relatively slow dynamics, the ocean plays an integral role in climate, and provides an important source of predictability at seasonal and longer timescales. In addition, the ocean provides the slowly evolving lower boundary to the atmosphere, driving, and modifying atmospheric weather. Understanding and monitoring ocean climate variability and change, to constrain and initialize models as well as identify model biases for improved climate hindcasting and prediction, requires a scale-sensitive, and long-term observing system. A climate observing system has requirements that significantly differ from, and sometimes are...
Tipo: Text
Palavras-chave: Ocean observing system; Ocean climate; Earth observations; In situ measurements; Satellite observations; Ocean modeling; Climate information.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00675/78724/80996.pdf

Physical and chemical factors influencing species distributions on hydrothermal sulfide edifices of the Juan de Fuca Ridge, northeast Pacific
Provedor de dados: 5
Autores: Sarrazin, Jozee; Juniper, Sk; Massoth, G; Legendre, P.
This study examines relationships between hydrothermal vent species and their surrounding physical and chemical environment on 2 high-temperature sulfide edifices of the Juan de Fuca Ridge (northeast Pacific). Video imagery and in situ temperature and chemical information were acquired during 2 remotely operated vehicle (ROV) dive programs in 1993 and 1995, for a total of 78 scans. Statistical analyses of environmental and faunal data reveal a heterogeneous distribution (cor respondence analyses) of hydrothermal species and demonstrate a significant influence of local physical and chemical conditions on species distributions (canonical correspondence analyses). Results confirm the importance of hydrogen sulfide to the distribution of vent species as well...
Tipo: Text
Palavras-chave: Hydrothermal vent ecology; Physical and chemical factors; In situ measurements; Habitat characterization; Species distribution; Sulfide edifice; Statistical analyses; Fluid flow; Substratum types; Mosaic habitat.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00280/39113/37666.pdf

Impact of environmental factors on in situ determination of iron in seawater by flow injection analysis
Provedor de dados: 5
Autores: Laes, Agathe; Vuillemin, Renaud; Leilde, Bernard; Sarthou, Géraldine; Bournot Marec, Claudie; Blain, Stéphane.
A sensitive method for iron determination in seawater has been adapted on a submersible chemical analyser for in situ measurements. The technique is based on flow injection analysis (FIA) coupled with spectrophotometric detection. When direct injection of seawater was used, the detection limit was 1.6 nM, and the precision 7%, for a triplicate injection of a 4 nM standard. At low iron concentrations, on line preconcentration using a column filled with 8-hydroxyquinoline (8HQ) resin was used. The detection limit was 0.15 nM (time of preconcentration = 240 s), and the precision 6%, for a triplicate determination of a I nM standard, allowing the determination of Fe in most of the oceanic regimes, except the most depleted surface waters. The effect of...
Tipo: Text
Palavras-chave: Temperature and pressure effects; Submersible chemical analyser; Seawater; In situ measurements; Iron; Flow injection analysis.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1209.pdf

La detection des effets subletaux des pollutions: Utilisation in situ d'un indice biochimique, la charge energetique
Provedor de dados: 5
Autores: Sylvestre, C; Batrel, Y; Legal, Y.
Marine water management implies the provision of environmental evolution. This can be seen with tests giving information on organism health. After a presentation of biochemical parameters (energetic charge) the authors describe the technique used and the results obtained with Nassarius reticulatus and Crangon crangon . In practice, the evolution of ratio of energetic charge to total nucleotides is a signal of imbalance in the ecosystem.
Tipo: Text
Palavras-chave: Nassarius reticulatus; Gastropoda; Crangon crangon; Malacostraca; Biochemical analysis; Nucleotides; In situ measurements; Estuarine organisms; Sublethal effects; Pollution tolerance.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1306.pdf

Evaluation of GlobCurrent surface ocean current products: A case study in Australia
Provedor de dados: 5
Autores: Cancet, Mathilde; Griffin, David; Cahill, Madeleine; Chapron, Bertrand; Johannessen, Johnny; Donlon, Craig.
Australia's marginal seas include a wide range of ocean current regimes ranging from tide-dominated in the North-West where the continental shelf is wide, to boundary current- and eddy-dominated in the South-East, where the shelf is narrow. Here, we take the opportunity to test the GlobCurrent surface ocean current products against in-situ observations in these two contrasting regimes. Observations by Acoustic Doppler Current Profiler (ADCP) instruments of Australia's Integrated Marine Observing System (IMOS) and drifting buoys of the Global Drifting Programme (GDP) are used. The monthly-timescale variability of the GlobCurrent alongshore current component is in moderately good agreement with the observations on the continental shelf in the South-East but...
Tipo: Text
Palavras-chave: Surface ocean currents; GlobCurrent assessment; East Australian Current; Tidal currents; In situ measurements.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00464/57607/60173.pdf

First Steps of in Situ Surface-Enhanced Raman Scattering During Shipboard Experiments
Provedor de dados: 5
Autores: Peron, Olivier; Rinnert, Emmanuel; Colas, Florent; Lehaitre, Michel; Compere, Chantal.
It is shown that the surface-enhanced Raman scattering (SERS) technique can be applied to detect organic molecules during in situ experiments. To this purpose, we used trans-1,2-bis(4-pyridyl)ethylene (BPE) as a target molecule. Adsorbed on the SERS chemosensor surface and excited under laser, the vibration modes of the molecules can be identified. SERS chemosensors are based on quartz substrates functionalized by silanization and partially coated with gold nanoparticles. SERS measurements during shipboard experiments were made with a home-made in situ Raman spectrometer connected to a marinized micro-fluidic system. The device was designed to host chemosensors in order to ensure measurements with a flow cell. A theoretical limit of detection was estimated...
Tipo: Text
Palavras-chave: Surface-enhanced Raman scattering; SERS; Chemosensors; Flow cells; Shipboard experiments; In situ measurements; Freundlich isotherm.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00016/12691/9718.pdf

Evaluación de la textura de spaghetti seco
Provedor de dados: 20
Autores: de Hombre, R.; Pérez, W.; Córdoba, A.; Pérez, J.
En el presente trabajo se presentan los resultados de la precisión de diferentes técnicas empleando una máquina Instron para medir la textura de spaghetti seco. Se comparó la técnica de flexión o doblado con los métodos que utilizan la celda de Kramer y la cuchilla simple de Warner-Bratzler. Se concluyó que en todos los casos las técnicas presentan buena precisión, pero el método de flexión ofrece los mejores resultados, con la ventaja adicional de que puede calcularse la fuerza de fractura en tensión como propiedad mecánica fundamental que caracteriza el producto.
Tipo: Journal Contribution
Palavras-chave: Texture; In situ measurements; Analytical techniques; Spaghetti.
Ano: 2008
URL: http://hdl.handle.net/1834/5021

Internal tides in the northern South China Sea from 20-day in-situ mooring observations in 1998.
Provedor de dados: 20
Autores: Cai, Yang; Guo, Pu; Fang, Wendong.
20-day in-situ ADCP current and CTD data are used to investigate the characteristics and energy of the internal tides in the northern South China Sea (NSCS). The results show that the O1, K1, M2 and S2 constituents of internal tides are energetic and diurnal constituents (O1 and K1) are dominating. In the observational period, the current vectors of these four constituents all rotate clockwise and the maximum semi-major axe of internal tidal ellipses is more than 14 cm/s. The variation of ocean temperature shows that the internal tides present obvious quasi-diurnal oscillation and the average amplitude reaches 50 m. Furthermore, these internal tides carry high energy and appear to be intermittent. The maximum values of KE (PE) during the observational...
Tipo: Journal Contribution
Palavras-chave: Internal tides; In situ measurements; Energy.
Ano: 2012
URL: http://hdl.handle.net/1834/5844