Monitoring Oceans from Space
Radiometric and in situ validation of satellite products.
Through the EU Water Framework Directive (WFD), Norway is obliged to manage the water resource with the same principles as the other EU-countries. In early 2014 a new guideline was published by the Norwegian Environment Agency (Veileder 02:2013). The main principle for the classification system is that the ecological state should be based on the biological quality elements such as chlorophyll-a, while the physical and chemical conditions, such as nutrients and Secchi disc depth, are support parameters.
A very high frequency of sampling of chlorophyll a is required for the classification to make sure that the seasonal variation of the chlorophyll concentration is captured. The classification should be based on the 90 percentile from minimum three years of data (recommended six years). For Norway, all coastal areas along the Norwegian coast are of interest (where coastal area is defined as within 1 nautical mile from the baseline ).
NIVA work to implement satellite monitoring as a robust tool for water framework management.
A monthly average of chlorophyll a from June 2011 from satellite data (MERIS on Envisat) is presented with the same colour classification as in an earlier national guideline (SFT 97:03).