التفاصيل البيبلوغرافية
| العنوان: |
DataSheet_1_Late Pleistocene to Holocene variations in marine productivity and terrestrial material delivery to the western South Atlantic.pdf |
| المؤلفون: |
Ana Lúcia Lindroth Dauner, Gesine Mollenhauer, Jens Hefter, Márcia Caruso Bícego, Michel Michaelovitch de Mahiques, César de Castro Martins |
| سنة النشر: |
2022 |
| المجموعة: |
Frontiers: Figshare |
| مصطلحات موضوعية: |
Oceanography, Marine Biology, Marine Geoscience, Biological Oceanography, Chemical Oceanography, Physical Oceanography, Marine Engineering, continental slope, marine productivity, mass accumulation rates, organic proxies, paleoceanography, South Brazil Bight, stratigraphical zones, terrestrial matter |
| الوصف: |
Despite the increased number of paleoceanographic studies in the SW Atlantic in recent years, the mechanisms controlling marine productivity and terrestrial material delivery to the South Brazil Bight remain unresolved. Because of its wide continental shelf and abrupt change in coastline orientation, this region is under the influence of several environmental forcings, causing the region to have large variability in primary production. This study investigated terrestrial organic matter (OM) sources and marine OM sources in the South Brazil Bight, as well as the main controls on marine productivity and terrestrial OM export. We analyzed OM geochemical (bulk and molecular) proxies in sediment samples from a core (NAP 63-1) retrieved from the SW Atlantic slope (24.8°S, 44.3°W, 840-m water depth). The organic proxies were classified into “terrestrial-source” and “marine-source” groups based on a cluster analysis. The two sources presented different stratigraphical profiles, indicating distinct mechanisms governing their delivery. Bulk proxies indicate the predominance of marine OM, although terrestrial input also affected the total OM deposition. The highest marine productivity, observed between 50 and 39 ka BP, was driven by the combined effects of the South Atlantic Central Water upwelling promoted by Brazil Current eddies and fluvial nutrient inputs from the adjacent coast. After the last deglaciation, decreased phytoplankton productivity and increased archaeal productivity suggest a stronger oligotrophic tropical water presence. The highest terrestrial OM accumulation occurred between 30 and 20 ka BP, with its temporal evolution controlled mainly by continental moisture evolution. Sea level fluctuations affected the distance between the coastline and the sampling site. In contrast, continental moisture affected the phytogeography, changing from lowlands covered by grasses and saltmarshes to a landscape dominated by mangroves and the Atlantic Forest. Our results suggest how the OM cycle in the South Brazil Bight ... |
| نوع الوثيقة: |
dataset |
| اللغة: |
unknown |
| العلاقة: |
https://figshare.com/articles/dataset/DataSheet_1_Late_Pleistocene_to_Holocene_variations_in_marine_productivity_and_terrestrial_material_delivery_to_the_western_South_Atlantic_pdf/20631633Test |
| DOI: |
10.3389/fmars.2022.924556.s001 |
| الإتاحة: |
https://doi.org/10.3389/fmars.2022.924556.s001Test
https://figshare.com/articles/dataset/DataSheet_1_Late_Pleistocene_to_Holocene_variations_in_marine_productivity_and_terrestrial_material_delivery_to_the_western_South_Atlantic_pdf/20631633Test |
| حقوق: |
CC BY 4.0 |
| رقم الانضمام: |
edsbas.E7D99A14 |
| قاعدة البيانات: |
BASE |
