ODYSSEA GREECE Water properties

Overview

The water quality modelling instrument for the observatories using the Delft3D software suite (https://oss.deltares.nl/web/delft3d)is the biogeochemical component of Delft3D, called Delwaq. This biogeochemical model includes an array of modules reproducing water quality processes that are then combined with the transport model. Consequently, Delwaq requires the hydrodynamic field calculated in the Delft3D-FLOW model and river inputs. Delwaq most importantly calculates primary production and Chlorophyll-a concentration while integrating dynamic process modules for dissolved oxygen, nutrient availability and phytoplankton species. The Delwaq horizontal (1/100° or ~1.1km) and vertical layering (10 vertical layers) follows the hydrodynamic model since no aggregation was done. In this product only the top layer is published.
The open boundary conditions for Delwaq are extracted from CMEMS. More specifically, the CMEMS product in use is MEDSEA_ANALYSIS_FORECAST_BIO. Since the model is designed to work in operational mode, the boundaries are retrieved using the Delft-FEWS workflow manager. The main steps to prepare Delwaq boundaries are: (1) Import of CMEMS water quality data with Delft-FEWS, (2) Boundary processing from CMEMS to Delwaq input files using Delft-FEWS adapter, (3) Mapping of state variables and unit conversions – as not all Delwaq state variables are available from CMEMS, some of these had to be mapped between the two systems.
The product is updated daily and includes 1 day hindcast and 2 day forecasts and simulates the following hourly 3D variables: chlorophyll-a concentration, dissolved oxygen, suspended solids, total nitrogen, total phosphorus, total silica, secchi depth.

DISCLAIMER: After 30th November 2021 this product will not be updated. This product is for demonstration purposes only. A simplified model configuration was used without full validation. It aims to demonstrate that a chain of Delft3D coastal models (hydrodynamics-waves-water quality) can be operationally run using the Delft-FEWS workflow manager and outputs can be visualized in Marinomica.

Variables

fractional_saturation_of_oxygen_in_sea_water
mass_concentration_of_chlorophyll_a_in_sea_water
mass_concentration_of_oxygen_in_sea_water
mass_concentration_of_phytoplankton_expressed_as_carbon_in_sea_water
mass_concentration_of_suspended_matter_in_sea_water
mass_concentration_of_total_nitrogen_in_sea_water
mass_concentration_of_total_phosphorus_in_sea_water
mass_concentration_of_total_silica_in_sea_water
secchi_depth_in_sea_water


Geographical coverageTemporal coverage   
Latitude = 40.67/41.41; Longitude = 24.27/27.41

Vertical coverage
0m

Spatial resolution
1/100 degree

Update frequency
daily

Producer
ODYSSEA