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  • 1
    Publication Date: 2023-01-13
    Keywords: CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; EAF-Nansen; LATITUDE; LONGITUDE; Profile; Salinity; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 862336 data points
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  • 2
    Publication Date: 2023-01-13
    Keywords: CTD/Rosette; CTD-RO; EAF-Nansen; File content; File format; File name; File size; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 65 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Kopte, Robert; Brandt, Peter; Dengler, Marcus; Tchipalanga, Pedro Cláver Mota; Macuéria, Marisa Francisca de; Ostrowski, Marek (2017): The Angola Current: Flow and hydrographic characteristics as observed at 11°S. Journal of Geophysical Research: Oceans, https://doi.org/10.1002/2016JC012374
    Publication Date: 2023-12-05
    Description: The eastern boundary circulation off the coast of Angola has been described only sparsely to date, although it is a key element in the understanding of the highly productive tropical marine ecosystem off Angola. Here, we report for the first time direct velocity observations of the Angola Current (AC) at ~11°S collected between July 2013 and October 2015 in the depth range from 45 to 450 m. The measurements reveal an alongshore flow that is dominated by intra-seasonal to seasonal variability with periodically alternating southward and northward velocities in the range of ±40 cm/s. During the observation period, a weak southward mean flow of 5-8 cm/s at 50 m depth is observed, with the southward current extending down to about 200 m depth. Corresponding mean southward transport of the AC is estimated to be 0.32 ± 0.046 Sv. An extensive set of hydrographic measurements is used to investigate the thermal structure and seasonality in the hydrography of the eastern boundary circulation. Within the depth range of the AC the superposition of annual and semi-annual harmonics explains a significant part of the total variability, although salinity in the near surface layer appears to be also impacted by year-to-year variability and/or short-term freshening events. In the central water layer, temperature and salinity on isopycnals vary only weakly on seasonal to annual time scales. The available dataset is further used to evaluate different reanalysis products particularly emphasizing the ocean's role in coupled climate model SST biases in the Eastern Tropical Atlantic.
    Type: Dataset
    Format: application/zip, 8 datasets
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  • 4
    Publication Date: 2021-05-19
    Description: El florecimiento de microalgas (fitoplancton) que a menudo pueden ser tóxicas puede aumentar con los efectos del cambio climático. En el presente trabajo se analizaron los datos recogidos del fitoplancton en el período 2005-2015 para evaluar su impacto en la dinámica de las especies de las sardinas (Sardinella maderensis y Sardinella aurita). La comunidad de fitoplancton está dominada por el grupo de las diatomeas, en la superficie que coincide con las áreas de agregación de la sardina durante el día. A pesar del predominio de diatomeas los años más fríos de la costa registraran el aumento de la proporción de los dinoflagelados. Las floraciones masivas de dinoflagelados producen en la estación fría o transición del dos temporadas del año dominadas por especies Tripos furca y Prorocentrum micans. En los años más fríos se produjo un aumento en la proporción de dinoflagelados y las especies de la sardina tiene un factor de baja condición.
    Description: Microalgae blooming (phytoplankton) that often can be toxic could increase with the effects of climatic change. In this work, data picked up from phytoplankton in the 2005-2015 period were analyzed to evaluate their impact in the dynamics of the sardine species (Sardinella maderensis and Sardinella aura). Phytoplankton community is dominated by the diatom group, in the surface that coincides with sardine aggregation areas during the day. In spite of the diatom prevalence, the coldest years in the coast registered an increase in dinoflagellate proportion. Massive dinoflagellate blooming takes place in the cold station or the yearly twoseason transition dominated by Tripos furca and Prorocentrum micans species. An increase took place in dinoflagellate proportion in the coldest years and the sardine species have a low condition factor.
    Description: Published
    Keywords: Variabilidad ; Dinámica ; Temperatura ; Fitoplancton ; Diatomeas ; Dynamics ; Variability ; Temperature ; Phytoplankton ; Diatoms
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.9-12
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