Some manifolds of periodic orbits in the restricted three-body problem     

Gerard Gómez  Miquel Noguera 《Celestial Mechanics and Dynamical Astronomy》1985,35(3):235-255

In the present paper we give some numerical results about natural families of periodic orbits, which emanate from limiting orbits around the equilateral equilibrium points of the Restricted Three-Body Problem, when the mass ratio is greater than Routh's critical one.  相似文献   

Biogeochemical characterization of particulate organic matter from a coastal hydrothermal vent zone in the Aegean Sea     

Josep M Bayona  Amanda Monjonell  Juan Carlos Miquel  Scott W Fowler  Joan Albaigs 《Organic Geochemistry》2002,33(12):1338

Three particle interceptor traps were moored from June to September 1996 along the SE coast of Milos Island (Aegean Sea), in an area known for its extensive seabed geothermal activity. The settling particles collected differed between sites not only in quantity but also in their geochemical composition. In the area directly influenced by warm water vents, the vertical flux of particulate material was almost one order of magnitude higher than that observed at the reference sites 6.5 km away from the vents, with a higher contribution of biogenic material in the former. The neutral lipid fractions exhibited a significant zooplankton biomarker signature (e.g. cholesterol and wax esters), followed by those of microalgal and terrigenous remains. The biogeochemical cycle of sterols included the formation of steroidal ketones, thiols and stanols, the latter two particularly associated with the venting activity. Moreover, the aliphatic and aromatic hydrocarbons in the particles from the venting area reflected a locally enhanced maturity of the organic matter. Although part of the material collected in the traps may have been exported in the vent waters, the higher fluxes observed in the vicinity of the hydrothermal plumes are mainly the result of an assemblage of zooplankton which, in turn, may contribute significantly to the sedimentation, through fast sinking faecal pellets, of the petrogenic hydrocarbons possibly generated in the vents.  相似文献   

An assessment of particulate organic carbon to thorium-234 ratios in the ocean and their impact on the application of Th as a POC flux proxy     

K.O. Buesseler  C.R. Benitez-Nelson  S.B. Moran  A. Burd  M. Charette  J.K. Cochran  L. Coppola  N.S. Fisher  S.W. Fowler  W.D. Gardner  L.D. Guo   . Gustafsson  C. Lamborg  P. Masque  J.C. Miquel  U. Passow  P.H. Santschi  N. Savoye  G. Stewart  T. Trull 《Marine Chemistry》2006,100(3-4):213

Thorium-234 is increasingly used as a tracer of ocean particle flux, primarily as a means to estimate particulate organic carbon export from the surface ocean. This requires determination of both the ²³⁴Th activity distribution (in order to calculate ²³⁴Th fluxes) and an estimate of the C / ²³⁴Th ratio on sinking particles, to empirically derive C fluxes. In reviewing C / ²³⁴Th variability, results obtained using a single sampling method show the most predictable behavior. For example, in most studies that employ in situ pumps to collect size fractionated particles, C / ²³⁴Th either increases or is relatively invariant with increasing particle size (size classes > 1 to 100s μm). Observations also suggest that C / ²³⁴Th decreases with depth and can vary significantly between regions (highest in blooms of large diatoms and highly productive coastal settings). Comparisons of C fluxes derived from ²³⁴Th show good agreement with independent estimates of C flux, including mass balances of C and nutrients over appropriate space and time scales (within factors of 2–3). We recommend sampling for C / ²³⁴Th from a standard depth of 100 m, or at least one depth below the mixed layer using either large volume size fractionated filtration to capture the rarer large particles, or a sediment trap or other device to collect sinking particles. We also recommend collection of multiple ²³⁴Th profiles and C / ²³⁴Th samples during the course of longer observation periods to better sample temporal variations in both ²³⁴Th flux and the characteristic of sinking particles. We are encouraged by new technologies which are optimized to more reliably sample truly settling particles, and expect the utility of this tracer to increase, not just for upper ocean C fluxes but for other elements and processes deeper in the water column.  相似文献   

A Deep-sea Channel in the Northwestern Mediterranean Sea: Morphology and seismic structure of the Valencia Channel and its surroundings   总被引：2，自引：0，他引：2  

Belen Alonso  Miquel Canals  Alberto Palanques  Jean-Pierre Rehault 《Marine Geophysical Researches》1995,17(5):469-484

The 400 km long Valencia Channel occupies the axis of the Valencia Trough in the Northwestern Mediterranean. Four different types of seismic reflection profiles were used to analyze the morphology and structure of the Valencia Channel with regard to the role played by both margins, Balearic and Iberian, of the Valencia Trough. From a detailed morphoseismic analysis of the Valencia Channel, its upper, middle, and lower courses can be characterized as follows: (1) in the upper course, tributaries are short and only slightly incised, with recent mass-transport deposits occurring on the adjacent continental slopes; (2) in the middle course, the channel deepens, and tributary valleys merge into it; and (3) the lower course begins after a sudden change in the direction of the channel, has a meandering path, is flanked by levees, and is fed by some valleys.During the Pliocene and Quaternary, at least four erosional and filling phases are observed in seismic profiles of the lower course of the Valencia Channel. The varying intensity of mass-transport processes and associated retrogressive slumping, which are related with fluctuations in sediment supply and relative sea-level changes, have played a major role in the formation, maintenance and deepening of the Valencia Channel. In addition to these sedimentary processes, a basement tectonic control and some morphostructural features affect the direction of the Valencia Channel locally.  相似文献   

Periodic orbit families near the 4:1 jovian resonance     

Miquel Grau  Miquel Noguera 《Celestial Mechanics and Dynamical Astronomy》1998,72(3):201-218

An enlarged averaged Hamiltonian is introduced to compute several families of periodic orbits of the planar elliptic 3-body problem, in the Sun–Jupiter–Asteroid system, near the 4:1 resonance. Four resonant critical point families are found and their stability is studied. The families of symmetric periodic orbits of the elliptic problem appear near the corresponding fixed points computed in this model. There is a good agreement for moderate eccentricity of the asteroid for three of these families, whereas the remaining family cannot be considered as a family of periodic orbits of the real model. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Phase relationship between sea level and abrupt climate change     

Francisco J. Sierro  Nils Andersen  Maria A. Bassetti  Serge Bern  Miquel Canals  Jason H. Curtis  Bernard Dennielou  Jose Abel Flores  Jaime Frigola  Beatriz Gonzalez-Mora  Joan O. Grimalt  David A. Hodell  Gwenael Jouet  Marta Prez-Folgado  Ralph Schneider 《Quaternary Science Reviews》2009,28(25-26):2867-2881

Direct traces of past sea levels are based on the elevation of old coral reefs at times of sea level highstands. However, these measurements are discontinuous and cannot be easily correlated with climate records from ice cores. In this study we show a new approach to recognizing the imprint of sea level changes in continuous sediment records taken from the continental slope at locations that were continuously submerged, even during periods of sea level lowstand. By using a sediment core precisely synchronized with Greenland ice cores, we were able to recognize major floods of the Mediterranean continental shelf over the past 270 kyr. During the last glacial period five flooding events were observed at the onset of the warmest Greenland interstadials. Consistent correspondence between warm climate episodes and eustatic sea level rises shows that these global flooding events were generated by pronounced melting of the Northern Hemisphere ice sheets, due to rapid intensification of Atlantic Meridional Overturning Circulation.The method described in this study opens a new perspective for inter-hemispheric synchronization of marine climate records if applied in other continental margins from the Southern Hemisphere or the equatorial regions.  相似文献   

Results from the European Deep Ocean Margins Research Training Network     

Miquel Canals  Ben De Mol 《International Journal of Earth Sciences》2009,98(4):715-720

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Morphogenesis of the SW Balearic continental slope and adjacent abyssal plain,Western Mediterranean Sea     

Angelo Camerlenghi  Daniela Accettella  Sergio Costa  Galderic Lastras  Juan Acosta  Miquel Canals  Nigel Wardell 《International Journal of Earth Sciences》2009,98(4):735-750

We present the seafloor morphology and shallow seismic structure of the continental slope south-east of the Balearic promontory and of the adjacent Algero-Balearic abyssal plain from multibeam and chirp sonar data. The main purpose of this research was to identify the sediment pathways from the Balearic promontory to the Algero-Balearic deep basin from the Early Pliocene to the Present. The morphology of the southern Balearic margin is controlled by a SW–NE structural trend, whose main expressions are the Emile Baudot Escarpment transform fault, and a newly discovered WSW–ENE trend that affects the SW end of the escarpment and the abyssal plain. We relate the two structural trends to right-lateral simple shear as a consequence of the Miocene westward migration of the Gibraltar Arc. Newly discovered steep and narrow volcanic ridges were probably enabled to grow by local transtension along the transform margin. Abyssal plain knolls and seahills relate to the subsurface deformation of early stage halokinetic structures such as salt rollers, salt anticlines, and salt pillows. The limited thickness of the overburden and the limited amount of deformation in the deep basin prevent the formation of more mature halokinetic structures such as diapirs, salt walls, bulbs, and salt extrusions. The uppermost sediment cover is affected by a dense pattern of sub-vertical small throw normal faults resulting from extensional stress induced in the overburden by subsurface salt deformation structures. Shallow gas seismic character and the possible presence of an active polygonal fault system suggest upward fluid migration and fluid and sediment expulsion at the seafloor through a probable mud volcano and other piercement structures. One large debris flow deposit, named Formentera Debris Flow, has been identified on the lower slope and rise of the south Formentera margin. Based on current observations, we hypothesize that the landslide originating the Formentera Debris Flow occurred in the Holocene, perhaps in historical times.

Angelo CamerlenghiEmail:

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Oxidative stress, genotoxicity and histopathology biomarker responses in mullet (Mugil cephalus) and sea bass (Dicentrarchus labrax) liver from Bizerte Lagoon (Tunisia)     

Ben Ameur W  de Lapuente J  El Megdiche Y  Barhoumi B  Trabelsi S  Camps L  Serret J  Ramos-López D  Gonzalez-Linares J  Driss MR  Borràs M 《Marine pollution bulletin》2012,64(2):241-251

The aim of the study was to evaluate the impact of environmental contaminants on oxidative stress, genotoxic and histopathologic biomarkers in liver of mullet (Mugil cephalus) and sea bass (Dicentrarchus labrax) collected from a polluted coastal lagoon (Bizerte Lagoon) in comparison to a reference site (the Mediterranean Sea). Antioxidant enzyme activities were lower in fish from the polluted site compared with fish from the reference site, suggesting deficiency of the antioxidant system to compensate for oxidative stress. DNA damage was higher in both fish species from the contaminated site indicating genotoxic effects. The liver histopathological analysis revealed alterations in fish from Bizerte Lagoon. Hepatocytes from both fish species featured extensive lipid-type vacuolation and membrane disruption. Results suggest that the selected biomarkers in both fish species are useful for the assessment of pollution impacts in coastal environments influenced by multiple pollution sources.  相似文献   

Critical point families at the 3:1 resonance     

Miquel Grau 《Celestial Mechanics and Dynamical Astronomy》1995,61(4):389-401

An enlarged averaged Hamiltonian is introduced to compute some families of periodic orbits of the planar elliptic 3-body problem, in the Sun-Jupiter-Asteroid system, near the 3:1 resonance. Five resonant families are found and their stability is studied, The families of symmetric periodic orbits of the elliptic problem appear near the corresponding fixed points which have been computed in this model and the coincidence is good for moderate values of the eccentricity of the asteroid for two of these families; the other three families do not fulfil the Sundman condition and they cannot be considered as families of periodic orbits of the real model.  相似文献