BUSCADOR RECOLECTA

FLUXES-1 Cruise (29SG20170711) carried out on the Research Vessel Sarmiento de Gamboa in 2017, Main goal: to quantify the lateral fluxes of organic matter through a sampling box of stations to estimate the role of POCs and DOC as sources and sinks of carbon in the region of study, compared to primary production, and the gravitational and active fluxes. Duration: 31 days (including navigation to/from Las Palmas) Activities: 38 stations, separated each other 50 nautical miles. An XBT will be dropped between each two stations to gain resolution for the inverse box-model

FLUXES-2 Cruise (29SG20171102) carried out on the Research Vessel Sarmiento de Gamboa in 2017, The main goal of FLUXES is to quantify the relevance of labile and semi-labile dissolved (DOC) and suspended (POCs) organic carbon (i.e. non-sinking organic carbon) in the context of the biological pump (BP), in Eastern Boundary Upwelling Ecosystems (EBUE). The Cape Blanc region (NW Africa), characterized by a rich mesoscale variability resulting from the interaction of the upwelling system and the Cape Verde Frontal Zone that built up the Giant Filament, will be used as a case study. We want to test the hypothesis that offshore lateral advection of POCs, as well as secondary circulation at the submesoscale range and vertical mixing of DOC and POCs, contribute significantly to the export of organic carbon in EBUE. If we were correct, our results will invite reconsideration of regional and global models of the carbon cycle, including the non-sinking carbon as a major pool and flux. We presume also that the project will help to clarify some uncertainties and paradoxes on the imbalance between sources and sinks of carbon in the global ocean. We aim to address the coupled dynamics between food-web diversity and function, in relation to the hydrographic and chemical environment in distinct deep-water masses, the origin and composition of DOC and POCs and their contribution to remineralization rates in the dark ocean. The level of complexity of this project in terms of fieldwork activities, logistics and interdisciplinary science (combining physical oceanography, biogeochemistry, and biological oceanography) will require the coordination of several research groups with a proven record of experience and skills in their respective fields of knowledge, that have been collaborating for more than a decade in the coupling between physical processes, plankton community structure and metabolism, and carbon biogeochemistry in the Canary Current EBUE

Anàlisis geoquímiques i fotos de visu i microscòpia de les mostres que integren la col·lecció de geostandards del Museu de Geologia Valentí Masachs (UPC Manresa). Análisis geoquímicas y fotos de visu y microscopio de las muestras que integran la colección de geostandares del Museo de Geología Valentí Masachs (UPC Manresa). Geochemical analyses and hand and microscopy pictures of the samples belonging to the geostandards collection of the Valenti Masachs Geology Museum (UPC Manresa). Analyses géochimiques et photographies au microscope et visu des échantillons qui forment la collection de geostandards du Musée de Géologie Valentí Masachs (UPC Manresa).

The dataset contains four files. File S1 corresponds to cathodoluminescence and BSE images of standard minerals. File S2 contains geochemical data of mineral standards ans samples obtained by SIMS and EPMA. File S3 contains the parameters used to obtain response surface models of IMF in mineral standards. File S4 is a response surface methodology tutorial., Instrumental mass fractionation (IMF) of isotopic SIMS analyses (Cameca 1280HR, CRPG Nancy) was predicted by response surface methodology (RSM) for 18O/16O determinations of plagioclase, K-feldspar and quartz. The three predictive response surface models combined instrumental and compositional inputs. The instrumental parameters were: (i) X and Y position, (ii) LT1DefX and LT1DefY electrostatic deflectors, (iii) chamber pressure and, (iv) primary-ion beam intensity. The compositional inputs included: (i) anorthite content (An%) for the plagioclase model and, (ii) orthoclase (Or%) and barium (BaO%) contents for the K-feldspar model. The three models reached high predictive powers. The coefficients R2 and prediction-R2 were, respectively, 90.47% and 86.74% for plagioclase, 87.56% and 83.17% for K-feldspar and 94.29% and 91.59% for quartz. The results show that RSM can be confidently applied to IMF prediction in stable isotope SIMS analyses by the use of instrumental and compositional variables.