44 documents found, page 1 of 5
Investigating ocean acidification off the Iberian Margin: Oceanographic results...
Salgueiro, Emilia; da Silva Magalhães, Vitor Hugo; Matos, Lelia; Rebotim, Andreia; Sousa, Fátima; Schweizer, Magali; González-Martín, MaríaABSTRACT: The EUROFLEETS+ CARBO-ACID cruise was carried out to investigate the ocean acidification effects on the carbonate organisms (coccolithophores, pteropods, foraminifera, and corals) along the W Iberian Margin. Samples of the water column, plankton, corals and sediments were collected to investigate the acidification effects since the pre-industrial Era until the present. These samples will allow not onl...
Earth Observation—An Essential Tool towards Effective Aquatic Ecosystems’ Manag...
Lisboa, Filipe; Brotas, Vanda; Santos, FilipeNumerous policies have been proposed by international and supranational institutions, such as the European Union, to surveil Earth from space and furnish indicators of environmental conditions across diverse scenarios. In tandem with these policies, different initiatives, particularly on both sides of the Atlantic, have emerged to provide valuable data for environmental management such as the concept of essenti...
Short-term effects of winter warming and acidification on phytoplankton growth ...
Domingues, Rita B.; Barreto, Marcelle; Brotas, Vanda; Galvão, Helena M.; Barbosa, Ana B.Changes in temperature and CO2 are typically associated with climate change, but they also act on shorter time scales, leading to alterations in phytoplankton physiology and community structure. Interactions among stressors may cause synergistic or antagonistic effects on phytoplankton dynamics. Therefore, the main goal of this work is to understand the short-term isolated and interactive effects of warming and...
Spatial Variability and Detection Levels for Chlorophyll-a Estimates in High La...
Lisboa, Filipe; Brotas, Vanda; Santos, Filipe; Kuikka, Sakari; Kaikkonen, Laura; Maeda, Eduardo EijiMonitoring lakes in high-latitude areas can provide a better understanding of freshwater systems sensitivity and accrete knowledge on climate change impacts. Phytoplankton are sensitive to various conditions: warmer temperatures, earlier ice-melt and changing nutrient sources. While satellite imagery can monitor phytoplankton biomass using chlorophyll a (Chl) as a proxy over large areas, detection of Chl in sma...
A compilation of global bio-optical in situ data for ocean-colour satellite app...
Valente, André; Sathyendranath, Shubha; Brotas, Vanda; Groom, Steve; Grant, Michael; Taberner, Malcolm; Antoine, David; Arnone, RobertA global compilation of in situ data is useful to evaluate the quality of ocean-colour satellite data records. Here we describe the data compiled for the validation of the ocean-colour products from the ESA Ocean Colour Climate Change Initiative (OC-CCI). The data were acquired from several sources (including, inter alia, MOBY, BOUSSOLE, AERONET-OC, SeaBASS, NOMAD, MERMAID, AMT, ICES, HOT and GeP&CO) and span t...
Temporal patterns of phytoplankton phenology across high latitude lakes unveile...
Maeda, Eduardo Eiji; Lisboa, Filipe; Kaikkonen, Laura; Kallio, Kari; Koponen, Sampsa; Brotas, Vanda; Kuikka, SakariMonitoring temporal changes in phytoplankton dynamics in high latitude lakes is particularly timely for understanding the impacts of warming on aquatic ecosystems. In this study, we analyzed 33-years of high resolution (30 m) Landsat (LT) data for reconstructing seasonal patterns of chlorophyll a (chl a) concentration in four lakes across Finland, between 60°N and 64°N. Chl a models based on LT spectral bands w...
ECOSSISTEMAS DA PLATAFORMA CONTINENTAL
Domingos, Isabel; Gameiro, Carla; Ferreira, Afonso; Adão, Helena; Amorim, Ana; Brotas, Vanda; Cabral, Henrique; Chainho, Paula; Costa, José LinoTerra é um planeta azul, em que 70% da superfície está ocupada por mar. Mais de 90% desse enorme volume está a profundidades superiores a 200 metros, onde a luz escasseia e a vida toma contornos diferentes dos que se observam nas zonas onde a energia solar penetra. O fundo do mar, na sua escuridão, é a última grande fronteira marinha a ser explorada. Denominado “mar profundo”, esse gigantesco ambiente, cujo pot...
Accuracy Assessment of Primary Production Models with and without Photoinhibiti...
Lobanova, Polina; Tilstone, Gavin H.; Bashmachnikov, Igor; Brotas, VandaThe accuracy of three satellite models of primary production (PP) of varying complexity was assessed against 95 in situ 14C uptake measurements from the North East Atlantic Ocean (NEA). The models were run using the European Space Agency (ESA), Ocean Colour Climate Change Initiative (OC-CCI) version 3.0 data. The objectives of the study were to determine which is the most accurate PP model for the region in dif...
Uncertainty in Ocean-Color Estimates of Chlorophyll for Phytoplankton Groups
Brewin, Robert J. W.; Ciavatta, Stefano; Sathyendranath, Shubha; Jackson, Thomas; Tilstone, Gavin; Curran, Kieran; Airs, Ruth L.; Cummings, DeniseOver the past decade, techniques have been presented to derive the community structure of phytoplankton at synoptic scales using satellite ocean-color data. There is a growing demand from the ecosystem modeling community to use these products for model evaluation and data assimilation. Yet, from the perspective of an ecosystem modeler these products are of limited use unless: (i) the phytoplankton products prov...
Obtaining Phytoplankton Diversity from Ocean Color: A Scientific Roadmap for Fu...
Bracher, Astrid; Bouman, Heather A.; Brewin, Robert J. W.; Bricaud, Annick; Brotas, Vanda; Ciotti, Aurea M.; Clementson, Lesley; Devred, EmmanuelTo improve our understanding of the role of phytoplankton for marine ecosystems and global biogeochemical cycles, information on the global distribution of major phytoplankton groups is essential. Although algorithms have been developed to assess phytoplankton diversity from space for over two decades, so far the application of these data sets has been limited. This scientific roadmap identifies user needs, sum...