1,721,160 research outputs found
Subtropical Shelf Front cruise - Thermosalinograph data
No full textThis dataset contains the near-surface ocean (nominally 3 m depth) temperature and salinity observations collected during the Subtropical Shelf Front Cruise (PD_2013_04) carried out on board the research Vessel Puerto Deseado from 3 to 10 October 2013.
A SeaBird Electronics SBE 21 thermosalinograph, which recorded data every 30 seconds, was used throughout the cruise. Data records in physical units are reported in an ascii text file. The variables are presented in the following order, with missing values indicated by "-9.990e-29":
Julian Day
Latitude [deg]
Longitude [deg]
Pressure [dbar]
Temperature [ITS-90, deg C]
Conductivity [S/m]
Salinity, Practical [PSU]
Sigma-t [kg/m^3]
Data were calibrated and quality controlled at the Servicio de HidrografÃa Naval, Argentina ([email protected]).
A readme.txt file containing this description is also included
Subtropical Shelf Front cruise - Conductivity-Temperature-Depth (CTD) data
No full textThis dataset contains CTD profiles and water samples collected during the Subtropical Shelf Front Cruise (PD_2013_04) on board the research Vessel Puerto Deseado from 3 to 10 October 2013.
A SeaBird Electronics model 911plus CTD fitted with double sensors for conductivity, temperature and dissolved oxygen (SBE43), one fluorescence sensor (SeaPoint) and altimeter (Benthos PSA-916) was used throughout the cruise, except for stations number 52 to 55, where a JFE Advantech model ASTD102 (Rinko-Profiler) was used. The Rinko profiler was equipped with pressure, temperature, conductivity, dissolved oxygen, fluorescence an turbidity sensors.
The data are reported in ascii text files. The files consist of a header followed by data converted to engineering units. The header contains station position, date and time information.
Data from individual stations are presented in separate ASCII character files consisting of 1 dbar data records in physical units. Each file is named after the CTD station number corresponding to this cruise. The variables are presented in the following order, with missing values indicated by "-9.990e-29":
Stations number 1 to 51
Latitude [deg]
Longitude [deg]
Pressure [dbar]
Primary Temperature [ITS-90, deg C]
Primary Conductivity [S/m]
Secondary Temperature [ITS-90, deg C]
Secondary Conductivity [S/m]
Fluorescence
Altimeter [m]
Primary Salinity, Practical [PSU]
Secondary Salinity, Practical [PSU]
Primary sigma-theta [kg/m^3]
Secondary sigma-theta [kg/m^3]
Primary Potential Temperature [ITS-90, deg C]
Secondary Potential Temperature [ITS-90, deg C]
Primary Oxygen concentration [ml/l]
Secondary Oxygen concentration [ml/l]
Depth salt water [m]
Stations number 52 a 55
Pressure [dbar]
Temperature [ITS-90, deg C]
Conductivity [S/m]
Fluorescence [ug/l]
Turbidity [FTU]
Salinity, Practical [PSU]
Sigma-theta [kg/m^3]
Potential Temperature [ITS-90, deg C]
Oxygen concentration [ml/l]
Depth salt water [m]
Water samples were collected for the determination of salinity, dissolved oxygen, nutrients and chlorophyll. The water samples were collected with a General Oceanics 1015-12, 5 liter Niskin bottles. Surface water samples for chlorophyll, salinity and nutrients were collected at predeterminated stations.
The water samples are reported in excel file format (*.xlsx). The first 22 columns contain the CTD parameters followed by the collected water samples data. The CTD values are averages taken while the winch is stopped and the bottle is tripped. The missing values are indicated by "-9.990e-29". The last column contains observations and quality controls.
Data were calibrated and quality controlled at the Servicio de HidrografÃa Naval, Argentina ([email protected]).
A README_CTD_BTL_STSF.txt file is included
This data set will also be uploaded to the US National Centers for Environmental Information
Subtropical Shelf Front cruise - Lowered Acoustic Doppler Profiler (LADCP) data
No full textThis dataset contains LADCP profiles collected during the Subtropical Shelf Front Cruise (PD_2013_04) on board the research Vessel Puerto Deseado from 3 to 10 October 2013.
An acoustic doppler current meter (ADCP) RDI/Teledyne model Workhorse 300 (300 kHz) was installed in the CTD cage and was used in vertical profiling (Lowered-ADCP).
The data are reported in ascii text files. The files consist of a header followed by data converted to engineering units. The header contains station position, date and time, and information regarding the software used for processing the raw data. The header information is followed by data records.
Data from individual stations are presented in separate ASCII character files. Each file is named after the LADCP/CTD station number corresponding to this cruise. When available, the variables are presented in the following order:
Pressure [dbar]
Depth [m]
Zonal (E-W) velocity [cm/s]
Meridional (N-S) velocity [cm/s]
Stations number 3, 22, 28, 29, 39 and 41 are too shallow and could not be processed satisfactorily.
The LADCP data was edited and calibrated at the Servicio de Hidrografia Naval, Argentina ([email protected])
Subtropical Shelf Front cruise - Thermosalinograph data
No full textThis dataset contains the near-surface ocean (nominally 3 m depth) temperature and salinity observations collected during the Subtropical Shelf Front Cruise (PD_2013_04) carried out on board the research Vessel Puerto Deseado from 3 to 10 October 2013. A SeaBird Electronics SBE 21 thermosalinograph, which recorded data every 30 seconds, was used throughout the cruise. Data records in physical units are reported in an ascii text file. The variables are presented in the following order, with missing values indicated by "-9.990e-29": Julian Day Latitude [deg] Longitude [deg] Pressure [dbar] Temperature [ITS-90, deg C] Conductivity [S/m] Salinity, Practical [PSU] Sigma-t [kg/m^3] Data were calibrated and quality controlled at the Servicio de HidrografÃa Naval, Argentina ([email protected]). A readme.txt file containing this description is also included.Fil: Charo, Marcela. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; ArgentinaFil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentin
Variability of Ocean Ecosystems around South America (VOCES)
No full textThe Large Marine Ecosystems (LME) around South America are highly productive, and diverse, and play an important role in the economy and society of the surrounding countries. These environments are under the effect of climate change, but little is known about how variability at different scales influences their biodiversity and the abundance of the exploited populations. Our work suggests that biodiversity can enhance the resilience of ecosystem structure to environmental trends around South America three Large Marine Ecosystems (LMEs).Fil: Purca, Sara. Instituto del Mar del Perú; PerúFil: Muelbert Jose H.. Universidade Federal do Rio Grande; BrasilFil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentin
O impacto do rio da Prata no oceano Atlântico
No full textOs habitantes da região costeira que se estende da província de Buenos Aires, na Argentina, a Rio Grande, no sul do Brasil, sabem que a água do mar é quase 10°C mais quente em janeiro que em julho. Um observador mais atento notaria também mudanças de cor na sua superfície em diferentes épocas do ano. Para explicar tais observações, especula-se sobre a existência de freqüentes incursões de água fria oriundas da corrente das Malvinas. Neste artigo são apresentadas evidências que sugerem que as alterações mais importantes ao longo de uma faixa costeira de aproximadamente 1.000 km se devem à influência variável das águas que o rio da Prata derrama no oceano Atlântico.Fil: Piola, Alberto Ricardo. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Möller, Osmar O.. Universidade Federal do Rio Grande do Sul; BrasilFil: Palma, Elbio Daniel. Universidad Nacional del Sur; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentin
Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic
Full text linkAntarctic Intermediate Water (AAIW) is an essential component of the Atlantic meridional overturning circulation (AMOC) contributing to balance the southward flow of North Atlantic Deep Water (NADW). However, the role of AAIW in Holocene abrupt climate changes remains poorly understood. Here we reconstruct changes in the flow strength of AAIW based on a high temporal resolution paleocurrent record from the Southwest Atlantic. Superimposed on a slight increase in AAIW strength at ~ 7 ka BP, a succession of millennial-scale AAIW variations is recognized in our paleocurrent records indicating a highly variable intermediate water circulation throughout the Holocene. Although variations in the strength and position of the Southern Westerlies Winds (SWW) are proposed to greatly influence the formation and circulation of AAIW, we cannot confirm such a potential SWW-AAIW linkage since our records of AAIW flow strength do not correlate to Holocene shifts of the SWW across the Atlantic. However, our data shows a good correspondence with abrupt variations in the AMOC with enhanced (reduced) northward advection of AAIW during periods of reduced (enhanced) NADW circulation. These results provide evidence for a Holocene AAIW-NADW see-saw. Thus, although the exact forcing mechanism remains unresolved, we suggest that Holocene perturbations in AAIW exerted a significant impact on the AMOC.Fil: Voigt, Ines. Universitat Bremen; AlemaniaFil: Chiessi, Cristiano Mazur. Universidade de Sao Paulo; BrasilFil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; ArgentinaFil: Henrich, Rüdiger. Universitat Bremen; Alemani
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Large-scale connectivity of the sandy beach clam Mesodesma mactroides along the Atlantic coast of South America, and climate change implications
Full text linkThe yellow clam Mesodesma mactroides is a cool-water species that typifies sandy beaches of the Southwestern Atlantic Ocean (SAO), which embraces one of the strongest ocean warming hotspots. The region is influenced by the Rio de la Plata (RdlP), which represents a zoogeographic barrier that restricts its larval exchange. We investigated yellow clam larval connectivity patterns using an individual based model (IBM). The IBM combined outputs from a 3D hydrodynamic model with a clam submodel that considered salinity- and temperature-dependent mortality for the planktonic larvae. Connectivity across the RdlP estuary occurred only for larvae released in spring during a strong La Niña event. Mortality due to freshwater precluded larval transport across the RdlP, whereas larval mortality induced by warmer waters reduced connectivity, leading to self-recruitment in most areas. Warming acceleration in this hotspot could further restrict larval connectivity between populations in the SAO, with conservation implications for this threatened species.Fil: Meerhoff, Erika. Universidad de la República; UruguayFil: Combes, Vincent. State University of Oregon; Estados UnidosFil: Matano, Ricardo. State University of Oregon; Estados UnidosFil: Barrier, Nicolas. Centre National de la Recherche Scientifique. Institut de Recherche pour le Développement; FranciaFil: Franco, Barbara Cristie. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentina. Instituto Franco-Argentino sobre Estudios del Clima y sus Impactos; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Hernández Vaca, Freddy. Instituto Oceanográfico de la Armada; EcuadorFil: Defeo, Omar. Universidad de la Republica; Urugua
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