Impact of circulation on high phytoplankton blooms and fish catch in the northern Adriatic (1990–2004)     

Romina Kraus  Nastjenjka Supić 《Estuarine, Coastal and Shelf Science》2011

We analyzed oceanographic, hydrologic and atmospheric conditions in the northern Adriatic (section between the Po River delta and Rovinj) from 1990 to 2004 in which extreme phytoplankton blooms appeared. The largest blooms occurred in February, March, July and October, and were higher in surface layers and in the western, more eutrophic part of the region. They often appeared when the Istrian Coastal Countercurrent (ICCC; strong southward current indicating a “closure” of the northern Adriatic circulation system) was pronounced. They seem to be related to the intensities of surface fluxes and Po River discharge rates. The blooms can float over the northern Adriatic for a long period (up to 30 days; typical for March) and can appear simultaneously in separate circulation systems with a different species distribution. Finally, we present a hypothesis based on comparisons of geostrophic currents and fish stock that specific February northern Adriatic oceanographic conditions play the key role in the Adriatic anchovy stock.  相似文献   

Distribution of trace metals in anchialine caves of Adriatic Sea,Croatia     

Vlado Cuculić  Neven CukrovŽeljko Kwokal  Marina Mlakar 《Estuarine, Coastal and Shelf Science》2011

This study presents results of the first comprehensive research on ecotoxic trace metals (Cd, Pb, Cu and Zn) in aquatic anchialine ecosystems. Data show the influence of hydrological and geological characteristics on trace metals in highly stratified anchialine water columns.  相似文献   

Repetitiveness and underlying characteristics of climatologic parameters in winter     

Mira Paskota  Dragana Vujović  Nedeljko Todorović 《Theoretical and Applied Climatology》2013,113(1-2):317-328

Starting from the standpoint that there are seasonal differences of climate variations on both global and local level, the authors of this paper had focused on analyzing climatologic parameters in winter months. The trends of several important parameters were detected, with temperature and precipitation having increasing, but number of ice days and snow cover having decreasing trends. Spectral analysis showed repetitive nature of climatologic parameters, some of them having the same or similar periods of about 6 to 7 years, 10 to 12 or 17.5 years, and 22 to 24 years. The precipitation has periodicity of 8 and 14 years. Further analysis of the underlying structure of the data by principal component analysis detected three easily explained dimensions: Temperature-Snow, Precipitation-Cyclone and Spring-in-Winter dimension. The spectral analysis of three virtual variables obtained by principal component analysis confirmed good agreement of original variables with the virtual dimensions.  相似文献   

Radio-continuum study of MCSNR J0536–7038 (DEM L249)     

L. M. Bozzetto  M. D. Filipović 《Astrophysics and Space Science》2014,351(1):207-212

We present a detailed radio-continuum study on Australia Telescope Compact Array (ATCA) observations of Large Magellanic Cloud (LMC) supernova remnant (SNR), MCSNR J0536–7038. This Type Ia SNR follows a horseshoe morphology, with a size 32 pc × 32 pc (1-pc uncertainty in each direction). It exhibits a radio spectrum α=?0.52±0.07 between λ=73 and 6 cm. We report detections of regions showing moderately high fractional polarisation at 6 cm, with a peak value of 71±25 % and a mean fractional polarisation of 35±8 %. We also estimate an average rotation measure across the remnant of –237 rad m^?2. The intrinsic magnetic field appears to be uniformly distributed, extending in the direction of the two brightened limbs of the remnant.  相似文献   

Draconids 2011: Outburst Observations by the Croatian Meteor Network     

Damir Šegon  Željko Andreić  Peter S. Gural  Korado Korlević  Denis Vida  Filip Novoselnik  Ivica Skokić 《Earth, Moon, and Planets》2014,112(1-4):33-44

The predicted Draconid meteor shower outburst during October 2011 had been observed by a portion of the Croatian Meteor Network whose stations encountered clear weather. A total of 95 Draconid orbits have been calculated from 18 contributing stations, and in this paper we present results for 63 orbits obtained from the fully automatic observation and processing pipeline. Two methods of trajectory estimation were applied, showing better fit results using a linearly changing velocity model versus a constant velocity model. The estimated mean radiant position has been found to be at RA = 262.6°, Dec = +55.7°, with estimated geocentric velocity Vg = 20.7 km/s.  相似文献   

On the origin of Triton     

Vladan čelebonović 《Earth, Moon, and Planets》1986,34(1):59-63

On dynamical grounds Neptune's satellite Triton is believed to be a captured body. We present nondynamical arguments in favour of this idea.  相似文献   

Aberration of light and the Poynting-Robertson effect     

J. Klačka 《Earth, Moon, and Planets》1993,62(3):239-244

Correct and complete (to terms of orderv/c) derivation of the Poynting-Robertson effect is presented. It is based on the idea that aberration of light is an important part in the effect of radiation on the motion of (interplanetary) dust particle. Derivations are presented for spherical particles, however, not only for perfectly absorbing ones. It follows from the presented derivations that the Poynting-Robertson effect is purely relativistic phenomenon and cannnot be treated in nonrelativistic manner, although results in orderv/c are sufficient for calculation in the Solar System studies.  相似文献   

Carbon and Oxygen Coronal Line Intensities for the Electron κ-DistributionI     

Dzifčáková  Elena  Kulinová  Alena 《Solar physics》2003,218(1-2):41-62

Solar Physics - The ionization and excitation equilibrium of C and O for the electron κ-distribution in the solar corona is studied. The change of the distribution shape changes the...  相似文献   

Sunspots and (un)orientability of space-time     

M. Saniga  J. Klačka 《Astrophysics and Space Science》1993,199(2):339-341

Within the framework of a globally conformally symmetric Abelian Higgs sunspot model it is shown that if there is even one sunspot present in the convection zone the (Sun's) space-time manifold becomesunorientable provided that the compatibility of the affine connection and the volume-form is demanded.  相似文献   

3-D Structure of the Galactic Interstellar Matter: A Contribution from GAIA     

Jokūbas Sūdžius  Saulius Raudeliūnas  Arūnas Kučinskas  Audrius Bridžius  Vladas Vansevičius 《Astrophysics and Space Science》2002,280(1-2):109-114

We investigate the possibilities for tracing interstellar extinction with the ESA's astrometric space mission GAIA. The analysis is based on detailed simulations of the GAIA photometry, which are used to derive the distribution of interstellar matter in a modelled Galaxy. We find that `small' diffuse clouds (diameter D = 4 pc, E <sub>B-V</sub> = 0.06) will be easily traced with GAIA up to the distances of ∼ 800 pc. `Large' diffuse interstellar clouds (D = 10 pc, E _B-V = 0.13) will be located up to the distances of ∼ 2.5 kpc. This holds for the reddening tracers of spectral types O – K2 brighter than V = 17. Inmost cases, due to their low spatial density, the early type stars (O– A2) cannot provide reliable information about the distribution of interstellar matter. None of the reddening tracers measured by GAIA will provide reliable identification of the individual interstellar clouds beyond the distances of ∼ 3 kpc. Therefore, we conclude that the information available from photometric observations will be not sufficient for the detailed reconstruction of the 3-D distribution of Galactic interstellar matter. It is therefore extremely important to define the new strategies which would allow to combine all the available information, including the earlier space- and/or ground-based investigations, together with the information which will be provided by GAIA itself (parallaxes, E _B-V etc.). This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献