SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Duvel, Jean Philippe; Vialard, Jerome.

The intraseasonal variability (ISV; 20-90 days) of the SST is examined using 7 yr of data from the Tropical Rainfall Measuring Mission's (TRMM) Microwave Imager ( TMI). The ISV of the SST is larger in the summer hemisphere and in regions of relatively small ocean mixed layer depth (MLD). For these regions, the reddening of the SST spectrum in regard to the surface flux spectrum suggests that the ISV of the SST is mostly controlled by the integration of the local surface forcing by ocean mixed layer. However, the precise origin of large-scale organized perturbations of the SST also depends on region and season. Since the ISV of the convection is an intermittent phenomenon, the local mode analysis (LMA) technique is used to detect only the ensemble of...

Tipo: Text

Palavras-chave: Madden julian oscillation; Western indian ocean; Summer monsoon; Mixed layer; Warm pool; Variability; Fluxes; Model; Atmosphere; Bengal.

Ano: 2007

URL: http://archimer.ifremer.fr/doc/00185/29638/27986.pdf

Variability of mechanical properties of flax fibres for composite reinforcement. A review

Hydrothermal Vent Ecosystems

Baley, Christophe; Gomina, Moussa; Breard, Joel; Bourmaud, Alain; Davies, Peter.

Flax fibres are a promising reinforcement in the development of biocomposites and are finding new applications in transport structures. However, there is a perceived problem with plant fibres related to the variability of the properties of these natural materials. This paper describes the factors which affect variability, from plant growth conditions to fibre sampling and testing. A large number of test results are presented (characterization of elementary fibres, bundles, assemblies of bundles, and unidirectional composites), and it is shown that provided fibre supply is carefully controlled, characterization procedures are appropriate, and manufacturing processes are optimal then excellent composite properties can be achieved with low variability.

Tipo: Text

Palavras-chave: Flax fibre; Composite; Variability; Mechanical properties.

Ano: 2020

URL: https://archimer.ifremer.fr/doc/00593/70488/68656.pdf

Origin, formation and variability of the Subpolar Mode Water located over the Reykjanes Ridge

Fisher, Charles R.; Takai, Ken; Le Bris, Nadine.

Tipo: Text

Palavras-chave: Upper temperature limit; Pompeii worms; Field; Variability; Thermotolerance; Environments; Communities; Life.

Ano: 2007

URL: http://archimer.ifremer.fr/doc/2007/publication-6109.pdf

Variation that can be expected when using particle tracking models in connectivity studies

De Boisseson, Eric; Thierry, Virginie; Mercier, Herle; Caniaux, G.; Desbruyeres, Damien.

The origin and formation of the Subpolar Mode Water (SPMW) located over the Reykjanes Ridge in the North-Atlantic Ocean and the variability of its properties over the period 1966-2004 are investigated through the use of a global eddy-permitting (1/4 degrees) ocean/sea-ice model and a Lagrangian analysis tool. The SPMW is fed by subtropical and subpolar waters advected by the branches of the North-Atlantic Current. The SPMW acquires its properties when its source waters enter the winter mixed layer in the Iceland Basin. The SPMW temperature variability is mainly explained by variations of the relative contributions of the subtropical and subpolar water transports to the total transport. Compared to the 1966-2004 mean, lower (higher) subtropical water...

Tipo: Text

Palavras-chave: Iceland Basin; Lagrangian analysis; North Atlantic current; Subpolar mode water; Variability.

Ano: 2012

URL: http://archimer.ifremer.fr/doc/00114/22510/20192.pdf

A mid-Holocene transition in the nitrogen dynamics of the western equatorial Pacific: Evidence of a deepening thermocline?

Hufnagl, Marc; Payne, Mark; Lacroix, Genevieve; Bolle, Loes J.; Daewele, Ute; Dickey-collas, Mark; Gerkema, Theo; Huret, Martin; Janssen, Frank; Kreus, Markus; Paetsch, Johannes; Pohlmann, Thomas; Ruardij, Piet; Schrum, Corinna; Skogen, Morten D.; Tiessen, Meinard C. H.; Petitgas, Pierre; Van Beek, Jan K. L.; Van Der Veer, Henk W.; Callies, Ulrich.

Hydrodynamic Ocean Circulation Models and Lagrangian particle tracking models are valuable tools e.g. in coastal ecology to identify the connectivity between offshore spawning and coastal nursery areas of commercially important fish, for risk assessment and more for defining or evaluating marine protected areas. Most studies are based on only one model and do not provide levels of uncertainty. Here this uncertainty was addressed by applying a suite of 11 North Sea models to test what variability can be expected concerning connectivity. Different notional test cases were calculated related to three important and well-studied North Sea fish species: herring (Clupea harengus), and the flatfishes sole (Solea solea) and plaice (Pleuronectes platessa). For sole...

Tipo: Text

Palavras-chave: Ocean circulation; Lagrangian approach; Variability; Marine protected areas; Renewable energy; Wind park; Model intercomparison; Ensemble.

Ano: 2017

URL: https://archimer.ifremer.fr/doc/00385/49660/50198.pdf

Estimated reservoir ages of the Black Sea since the last glacial

Kienast, M.; Lehmann, M. F.; Timmermann, A.; Galbraith, E.; Bolliet, T.; Holboum, A.; Normandeau, C.; Laj, C..

Sedimentary delta(15)N records from the oligotrophic western equatorial Pacific (WEP) off Mindanao show that late Holocene sedimentary delta(15)N is substantially lower than that of the early Holocene, following a gradual >3 parts per thousand decrease that occurred between 7 and 3 kyrs ago. Analyses of modem day nitrate isotope profiles from the same region indicate the sensitivity of the WEP N pools towards (1) the advection of (15)N-enriched nitrate from the Eastern Equatorial Pacific (EEP) by the North Equatorial Current (NEC) and the Mindanao Current in subsurface waters and, (2) at shallow depths, the input of new and (15)N-depleted nitrate through N, fixation. We suggest that the Holocene decrease in sedimentary delta(15)N reflects a diminished...

Tipo: Text

Palavras-chave: Tropical Pacific; El Nino; Surface temperature; Fresh water; Nitrate; Mindanao; Ocean; Variability; Holocene; Seawater.

Ano: 2008

URL: https://archimer.ifremer.fr/doc/00207/31843/30257.pdf

Ocean-Atmosphere Coupling in the Monsoon Intraseasonal Oscillation: A Simple Model Study

Kwiecien, O.; Arz, H. W.; Lamy, F.; Wulf, S.; Bahr, A.; Roehl, U.; Haug, G. H..

Accelerator mass spectrometry (AMS) radiocarbon dating of ostracod and gastropod shells from the southwestern Black Sea cores combined with tephrochronology provides the basis for studying reservoir age changes in the late-glacial Black Sea. The comparison of our data with records from the northwestern Black Sea shows that an apparent reservoir age of similar to 1450 C-14 yr found in the glacial is characteristic of a homogenized water column. This apparent reservoir age is most likely due to the hardwater effect. Though data indicate that a reservoir age of similar to 1450 C-14 yr may have persisted until the Bolling-Allerod warm period, a comparison with the GISP2 ice-core record suggests a gradual reduction of the reservoir age to similar to 1000 C-14...

Tipo: Text

Palavras-chave: Mediterranean abyssal sediments; Minoan eruption; Tephra layers; Radiocarbon; Santorini; Deglaciation; History; Variability; Calibration; Resolution.

Ano: 2008

URL: https://archimer.ifremer.fr/doc/00209/31990/30430.pdf

On the ocean salinity stratification observed at the eastern edge of the equatorial Pacific warm pool

Bellon, Gilles; Sobel, Adam H.; Vialard, Jerome.

A simple coupled model is used in a zonally symmetric aquaplanet configuration to investigate the effect of ocean-atmosphere coupling on the Asian monsoon intraseasonal oscillation. The model consists of a linear atmospheric model of intermediate complexity based on quasi-equilibrium theory coupled to a simple, linear model of the upper ocean. This model has one unstable eigenmode with a period in the 30-60-day range and a structure similar to the observed northward-propagating intraseasonal oscillation in the Bay of Bengal/west Pacific sector. The ocean-atmosphere coupling is shown to have little impact on either the growth rate or latitudinal structure of the atmospheric oscillation, but it reduces the oscillation's period by a quarter. At latitudes...

Tipo: Text

Palavras-chave: Madden julian oscillation; Tropical circulation model; Sea surface temperature; Asian summer monsoon; Convective perturbations; Walker circulation; Radiation budget; Indian ocean; Variability; Simulation.

Ano: 2008

URL: http://archimer.ifremer.fr/doc/00185/29637/27987.pdf

Etude de la variabilité de la circulation du gyre subpolaire de l'Atlantique Nord à partir des données Ovide et de mesures satellitaires

Maes, Christophe.

The observations collected during a series of three oceanographic cruises dedicated to the study of the frontal zone at the eastern edge of the equatorial Pacific warm pool are used to study the role of salinity in the static stratification of the ocean upper layers. By combining physical and biogeochemical data, the position of the frontal zone at the surface could be accurately determined between 157.5 degrees E and 173.4 degrees E. A multiparameter approach is required due to the uncertainty that may result when one parameter is only considered. In the subsurface the thermohaline structures around the frontal zone reveal the predominant role of the ocean salinity stratification within the isothermal layers. However, the actual methods to determine the...

Tipo: Text

Palavras-chave: Atmosphere response experiment; Nino southern oscillation; Sea surface temperature; Barrier layer formation; Westerly wind bursts; El nino; Mixed layer; Fresh pool; Toga coare; Variability.

Ano: 2008

URL: https://archimer.ifremer.fr/doc/00208/31886/30312.pdf

Morphometry and Vascularization of the Rabbit Kidneys (Oryctolagus cuniculus)

Gourcuff, Claire.

The cyclonic circulation of the North Atlantic subpolar gyre, between 50°N and 63°N, plays a key role in the climate variability. The Ovide program contributes to the observation of the circulation in this region. A section is repeated every two years in summer since 2002 between Greenland and Portugal following a path close the Fourex 1997 section. To get transport estimates across the sections, a geostrophic box inverse model is used, constrained with direct current measurements. Our new estimates of Fourex transports show the need to use constraints temporally associated with the section to get transports estimates representative of the circulation at the section realisation dates. It is also shown that altimetry velocities can be used instead of ADCP...

Tipo: Text

Palavras-chave: Inverse Model; Courantology; Geostrophy; Altimetry; East Greenland Coastal Current; Freshwater fluxes; Heat transport; Meridionnal Overturning Circulation (MOC); Variability; North Atlantic; Subpolar gyre; Ovide; Modèle inverse; Géostrophie; Courantométrie; Altimétrie; Courant Côtier Est Groenlandais; Flux d'eau douce; Transport de chaleur; Circulation Méridienne de Retournement (MOC); Variabilité; Atlantique Nord; Gyre subpolaire; Ovide.

Ano: 2008

URL: http://archimer.ifremer.fr/doc/2008/these-6226.pdf

International Journal of Morphology

Santos-Sousa,C. A; Stocco,A. V; Mencalha,R; Jorge,S. F; Abidu-Figueiredo,M.

Rabbits have been used as urologic models in many studies. The aim of this study was to characterize the renal morphology and anatomical variations of the renal pedicle in rabbit. The research ethics committee of Rio de Janeiro Federal Rural University approved this study. The animals were obtained from the university's necropsy unit. Dissections were performed in 50 adult rabbits, male and females, without macroscopic renal pathology. Kidney measurements were made with a digital caliper: length, width, and thickness. The length and origin of the renal arteries and main branches and length of the renal veins were also determined. The terminology of Nomina Anatomica Veterinaria was followed. The mean and standard deviation of the length of the right kidney...

Tipo: Journal article

Palavras-chave: Blood vessels; Kidney; Measurements; Variability; Rabbit.

Ano: 2015

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400017

Screening of soybean cultivars for chloride tolerance in Argentina

JBAG

Lúquez,J.E; Briguglio,M.A; Irigoyen,F; Eyherabide,G.A.

Soybean Glycine max [L. (Merrill)] is the most important crop in Argentina, where soil salinization is increasing. Development of salt tolerant cultivars is an effective approach to expand the crop area and minimize yield loss in saline soils. The aim of this work was to screen commercial soybean cultivars for chloride tolerance in three experiments. In the first experiment 37 cultivars were placed in paper rolls wetted with 50 mM NaCl. Germination speed and hypocotyl and radicle length were registered. Twelve cultivars were chloride tolerant as suggested by their hypocotyl and radicle length. In the second experiment, seven cultivars were grown under greenhouse conditions in containers with sandy soil, nutrients and 50 mM NaCl solution. Leaf scorch (LS)...

Tipo: Info:eu-repo/semantics/article

Palavras-chave: Soybean; Chloride tolerance; Germination; Screening; Variability; Glycine max [L. (Merrill)].

Ano: 2015

URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332015000300005

A revision of Choleva agilis (Illiger, 1798) and related species (Coleoptera: Staphylinoidea: Cholevidae)

Schilthuizen, M..

The Choleva agilis-group is revised. The three species are redescribed and their zoogeography is discussed. The phylogeny of the three species is hypothesized. Choleva jailensis Jeannel, 1923 and C. agilis clermonti van der Wiel, 1931 are new synonyms of C. agilis (Illiger, 1798). C. lederiana var. brevicollis Krogerus, 1926, is a new synonym of C. lederiana Reitter, 1901. The cavernicolous taxon gracilenta Szymczakowski, 1957, formerly regarded as a subspecies of C. lederiana, is transferred to C. septentrionis Jeannel, 1923.

The anatomy of the king crab Hapalogaster mertensii Brandt, 1850 (Anomura: Paguroidea: Hapalogastridae): new insights into the evolutionary transformation of hermit crabs into king crabs

Palavras-chave: Cholevidae; Choleva; Key; Phylogeny; Zoogeography; Variability; Europe; 42.75.

Ano: 1990

URL: http://www.repository.naturalis.nl/record/318021

Keiler, J.; Richter, S.; Wirkner, C.S..

The emergence of king crabs from a hermit crab-like ancestor is one of the most curious events in decapod evolution. King crabs comprise two taxa, Lithodidae and Hapalogastridae, and while lithodids have formed the focus of various anatomical studies, the internal anatomy of hapalogastrids has never been studied although this group might represent a more ancestral morphological condition within king crabs than lithodids do. To better understand the evolutionary transformation of pagurid-like hermit crabs into king crabs, we studied the hemolymph vascular system and associated organs of representatives of Hapalogaster and present here the first micro-computer tomography data pertaining to the internal anatomy of hapalogastrids. Our results for...

Karyotypes of four species of Xenodontini snakes (Serpentes: Dipsadidae) and implications for taxonomy

Palavras-chave: Anomala; Carcinization; Circulatory system; Evolutionary morphology; Structural coherence; Variability; 42.74; 38.22; 42.62.

Ano: 2015

URL: http://www.repository.naturalis.nl/record/579455

Falcione, C.; Hernando, A.; Barrasso, D.A.; Pietro, D. di.

The karyotypes of four South American Xenodontini snake species, Lygophis dilepis, L. meridionalis, L. flavifrenatus and L. anomalus, are here described for the first time. We studied specimens from northeastern Argentina using conventional and silver (Ag-NOR) staining. While the typical ophidian karyotype is 2n = 36, we found that the karyotype of the studied species is 2n = 34, with metacentric and submetacentric chromosome pairs. The Ag-NOR staining revealed that nucleolar organizer regions (NORs) are located on one pair of microchromosomes. In L. dilepis and L. anomalus the 4th chromosome pair is heteromorphic, and we suggest that it might be considered as the ZW sex chromosome pair. The optimization of available karyological data on a molecular...

A revision of the polytypic Albinaria hippolyti (Boettger, 1878) from Crete (Gastropoda Pulmonata: Clausiliidae)

Palavras-chave: Karyosystematics; Lygophis; Variability.

Ano: 2016

URL: http://www.repository.naturalis.nl/record/611374

Schilthuizen, M.; Welter-Schultes, F.W.; Wiese, V..

On the basis of both detailed distributional field studies and morphological analyses, a revision of the polytypic species Albinaria hippolyti from Central and Eastern Crete is presented. True subspecies are distinguished from mere geographic varieties by the presence of narrow hybrid zones. Using this criterion, four adjoining subspecies are recognised: A. h. hippolyti (Boettger, 1878), A. h. aphrodite (Boettger, 1883), A. h. holtzi (Sturany, 1904) and A. h. harmonia subspec. nov. Additionally, two geographically isolated and conchologically distinctive forms are also treated as subspecies: A. h. arthuriana (Boettger, 1878) and A. h. asterousea subspec. nov. The geographical distribution and variability of each subspecies is described in detail. A. h....

A review of Chorthippus species with angled pronotal lateral keels from Greece with special reference to transitional populations between some Peloponnesean taxa (Orthoptera, Acrididae)

Palavras-chave: Gastropoda; Pulmonata; Clausiliidae; Albinaria hippolyti; Taxonomy; Hybrid zones; Variability; Zoogeography; 42.73.

Ano: 1993

URL: http://www.repository.naturalis.nl/record/318774

Willemse, F.; Helversen, O. von; Odé, B..

This paper presents a summary of the current knowledge on the systematics of the Greek taxa of Chorthippus, morphologically characterised by angled lateral pronotal keels (usually grouped as Glyptobothrus). Prior to this paper, based on traditional morphology, ten taxa of Chorthippus with angled lateral pronotal keels were recognized from Greece. Based on morphology as well as (and more importantly so) bioacoustics thirteen Greek taxa are now recognised. With addition of a few additional related taxa that occur only outside Greece, all are treated in this paper: Chorthippus apricarius apricarius (Linnaeus, 1758), C. vagans vagans (Eversmann, 1848) (not in Greece), C. v. cypriotus (Uvarov, 1936) stat. nov. [Cyprus], C. v. africanus Nadig, 1981 [N. Africa],...