1,721,067 research outputs found
ADCP current measurements (75 kHz) during Med-SHIP cruise TAlPro2022 on RV BELGICA
No full textThis data set contains the post-processed current profiles collected by means of a vessel-mounted ADCP (on the Belgia vessel RV BELGICA) in the Western Mediterranean Sea during May 2022. The TAlPro2022 cruise was part of the Med-SHIP programme. During the whole campaign a VM-ADCP (RDI Ocean Surveyor, 75 KHz) worked along the ship route. The depth range of the current profiler is about 725 m. Data acquisition is carried out using the RDI VMDAS software vers. 1.50.19. The number of bins has been set to 80, with a bin size of 10 m . The instrument ran in narrowband mode and was controlled by computers using the conventional RDI VMDAS software under a MS Windows system with a pinging set to be as fast as possible. No interferences with other used acoustical instruments were observed. The ADCP data have been post-processed with the CODAS3 Software System, which allows extracting data, assigning coordinates, editing and correcting velocity data. Moreover, the data were corrected for errors in the value of sound velocity in water, and misalignment of the instrument with respect to the axis of the ship (about 0.42 degrees). After additional editing, to eliminate suspect values, and those where certain thresholds were surpassed, one netCDF file was created by CODAS3
LADCP current profiles collected during Med-SHIP cruise TAlPro2022
No full textThis data set contains station data of top-to-bottom oceanic current measurements performed with Lowered Acoustic Doppler Current Profilers (LADCP) during the Med-SHIP cruise TAlPro2022 (Chief Scientist: Katrin Schroeder; Toulone - La Spezia, RV Belgica, 17/05/2022 - 26/05/2016). The LADCP devices in use were a downward and an upward-looking ADCP of type Teledyne RDI Workhorse Monitor 300 kHz. Station data of zonal and meridional oceanic velocities are reported in [cm/s] on a 4 m vertical grid. The processing of the data has been done using the LDEO LADCP data processing software (Thurnherr et al., 2010)
Continuous thermosalinograph oceanography along MedSHIP cruise TAlPro2016 on RV Angeles Alvariño
No full textThis data set contains underway Temperature, Salinity and Fluorescence data collected by a Thermosalinograph (TSG) during the MedSHIP cruise TAlPro2016 (Palermo - Barcelona, RV Angeles Alvariño, 18/08/2016 - 29/08/2016). Underway data was collected along the cruise track with an autonomous TSG system, consisting of a SBE21 together with a SBE38 Thermometer. Both systems worked independent from each other throughout the cruise. While temperature is taken at the water inlet in about 5 m depth (SBE38, S/N 0437, last calibration on 11/07/2008), salinity is estimated within the interior TSG from conductivity and interior temperature (SBE21, S/N 3329, last calibration on 15/01/2016). A Turner fluorometer 10-Au-005 (S/N 7019 RTX, last calibration on 21/01/2016) is connected to the system
Mixing in the Deep Waters of the Western Mediterranean
No full textIn terms of the overall mixing environment, the Mediterranean Sea has relatively small tides and relatively weak winds compared with the greater ocean environment, so vertical diffusion due to mechanical mixing is likely to be generally smaller than in the open ocean. As the western Mediterranean deep water (WMDW) is naturally fresher and colder than the Levantine intermediate water (LIW), salinity and temperature both decrease downward below the LIW core toward the deep water. In the halocline-thermocline between the core of LIW and the deep water, warmer saltier waters overlie colder fresher waters and in such a region salt finger mixing processes can be effective mixing agents transporting salt, heat, and density downward. For the deep western Mediterranean, vertical diffusion due to mechanical mixing is expected to be small; and downward mixing of heat salt and density is expected to be substantial in the halocline-thermocline 400–1500-m depth
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
Thermohaline staircases in the western Mediterranean Sea
Full text linkThermohaline staircase structures are commonly observed in the western Mediterranean Sea within the halocline-thermocline connecting the Levantine Intermediate Water at about 400 m depth with the western Mediterranean deep waters below 1,500 m. In this halocline-thermocline where warmer, saltier waters overlie colder, fresher deep waters, salt finger mixing processes are thought to be active and produce staircases with layers of order 75 m thickness containing nearly constant properties separated by sharp steps of order 6 m thickness with jumps in properties between the layers. While the layers have nearly constant salinity, potential temperature, and potential density, each property decreases very slightly downward through the layer so that it appears that salinity, heat, and density are being put into the top of each layer and then convectively mixing downward through the layer. Such observations are consistent with salt finger processes that transport salinity, heat and density downward through the halocline-thermocline.Using repeat occupations of stations across the southern western Mediterranean Sea in 2006, 2008, and 2010, we have calculated downward salt transport, FS,of 5.35×10?8 psums?1, and downward heat transport, FT,of 12.4×10?8? Cms?1. After multiplying these fluxes by haline contraction (?) and thermal expansion (?) coefficients respectively, the buoyancy flux ratio, ?FT/?FS, is found to be 0.74 and there is a downward density flux of 1.0×10?10 Wkg?1. The halocline-thermocline in this region between 600 and 1,400 dbar has a background vertical salinity gradient of 0.95×10?4m?1 and a vertical temperature gradient of 4.1×10?4?Cm?1 so the background density ratio is R?=(? d? /dz)/(? dS/dz) is 1.28. Dividing the downward fluxes by the background vertical gradients yields vertical diffusivities kS=5.6×10?4m 2s?1 and kT=3.0×10?4m 2s?1. These downward fluxes of salt and heat are compared with estimates based on salt finger experiments and theory and with the long-term increases in salinity and temperature in the deep western Mediterranean Sea over the past 40 years
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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