Monitoring Phytoplankton Productivity from Satellite - An Aid to Marine Resources Management

An important biogeochemical quantity monitored by satellites is the concentration of chlorophyll-a, an omnipresent pigment in all phytoplankton species and, for this reason, commonly used as an index of phytoplankton biomass. In marine waters, phytoplankton biomass is a key component of the ecosystem. Phytoplankton are responsible for the conversion of carbon dioxide to organic carbon through the pro- cess of photosynthesis, i.e. primary production. Marine photosynthesis represents approximately half of the total carbon fixation in the global biosphere, making it a critical element of the Earth�s carbon budget and biogeochemical cycles. In addition, phytoplankton biomass and primary production are descriptors of the first trophic level in the marine food chain. Quantitative estimates of these variables from satel- lite could therefore provide important information on the structure and functioning of the rest of the food web, up to commercially exploited fish populations.JRC.DDG.H.3 - Global environement monitorin

Assessing the Dynamics of Ecological Provinces in the European Seas

The concept of oceanographic provinces has existed for almost a century, providing a useful framework for understanding the mechanisms controlling biological, physical and chemical processes in the ocean and their interactions. This work is an attempt to identify and map marine provinces using satellite observations related to biological processes such as phytoplankton primary production. The approach is based on fuzzy logic as a means of classifying the European Seas into objectively defined areas. The analysis has identified nine domains based on three important variables, surface chlorophyll concentration, sea surface temperature, and available radiation for photosynthesis. These domains were subsequently mapped over the European geographical window using satellite ocean colour and temperature data. The method displays correctly most important productive and unproductive zones, as well as captures the dynamic nature of the marine systems. This study has been conducted in the frame of the institutional project ECOMAR (Monitoring and Assessment of Marine Ecosystems, Action # 2121) within the Inland and Marine Unit of the Institute for Environment & Sustainabilility.JRC.H.5-Rural, water and ecosystem resource

A database for the industrial trawl fishery of Cote d'Ivoire

Fishery statistics for the industrial trawl fishery of Cote d'Ivoire have been well documented since 1968. However, data processing has changed significantly with time and some of the data files have been lost. In 1997, the Centre de Recherches Oceanologiques d'Abidjan decided to retrieve and process all trawl data available from different sources. This paper gives an overview of the database covering the period 1968 to 1997 and describes its coverage, format, structure and use. The database was developed using MS ACCESS and is a powerful tool for storing information about this fishery, and for analysis of its dynamics over a period of 30 years

Assessment of Global Ocean Colour Products against In-situ Datasets

Ocean colour from satellite has given over the last two decades another dimension to ecosystem studies and marine biology, providing key information on the timing and spatial distribution of phytoplankton blooms, and the magnitude of primary production. Remote observations of ocean colour from space represent therefore a major tool directly related to the marine biogeochemical distributions and associated processes. One of the goals of the European GMES Integrated Project MERSEA is to provide an accurate and consistent stream of ocean colour data, by exploiting the products made available in a number of individual missions launched by various space agencies. In this context, validation exercises, done via the direct comparison of satellite derived quantities with in situ measurements, represents a critical component in establishing the accuracy of the remotely-sensed data. In this study we present a validation of Chlorophyll-a concentration derived from SeaWiFS and MODIS sensors, against in situ measurements retrieved from three different datasets (NODC, SeaBASS, JODC). The results of this comparison are well in line with previous analysis conducted on SeaWiFS, both from the point of view of the global statistics than for most of the regional results, and the uncertainties are lower than the value of 0.35 often considered as the objective for Chlorophyll-a distributions. The SeaWiFS global average of RMS difference (for log-transformed values) shows an uncertainty of 0.29, while it is is slightly higher for MODIS (0.31), a difference likely partly due to a smaller statistical basis. The agreement is better for open ocean regions (RMSD reduced to 0.26 and 0.27 for SeaWiFS and MODIS respectively) than for coastal areas. An important objective of this work, that goes beyond the scope of the present report, was to develop the validation procedure and protocols for further analyses regularly reviewing validation results to take into account successive reprocessing and other sensors, as well as including additional in situ data sets.JRC.H.3-Global environement monitorin