MERCATOR OCEAN JOURNA: 
SEPTEMBER 2021 
_On-shelf surface 
Storm Jake 29/02-05/03/2016 
57.8°] 
Off-sheilf_15m depth 
Storm Gertrude 29-30/01/2016 
Start 
0 
C7.6° bh 
46° [ 
AA 
DC 
u 
" 
N 
54,2°N 
A OR 
Star} 
Urifter 
74° 
7.20 N 
SG RE 
M 
a 
— Drifter 
not c*+" 
i 
57.0°h 
11.0° WW 
7 
105° 
4{].0° WM 
95 
70.59 WM 
, Cpl 
20° W 19.5° 0 
ıgure »: Trajectories simulation during storm Jake (left) and storm Gertrude (right). The black line represents the drifter trajectory, the 
trajectory computed using the ocean currents and the Stokes drift from a non-coupled ocean and wave models are in blue, from a coupled 
1cean-wave Is red 
2. STATUS AT THE END OF COPERNICUS 1 
The NWS-MFC produces forecast and reanalysis products, 
delivered to the Copernicus Marine Service catalogue. 
Multi Model Ensemble Multi Year Products, based on NWS, 
Iberia-Biscay-Irish and Global reanalysis overlapping 
areas are also made available as internal product for all 
Copernicus Marine Service partners. 
The forecast and reanalysis for the North West-European 
Shelf are produced using systems based on different 
configurations and implementations of the ocean 
circulation with tides (NEMO), wave (WAVEWATCH-IIN) 
and biogeochemical (ERSEM) models. The physical and 
biogeochemical systems have a 3D-Var data assimilation 
scheme based on NEMOVAR. 
The wave products and the high-resolution physical 
forecast system have been developed and implemented 
during Copernicus1, and were not available in May 2015, 
when the service started. All the components have been 
subject to several updates during the last 6 years, as 
described in the previous section. 
Forecast systems are run once a day and have a forecast 
lead time of 6-dav. The forecast is initialised by an analvsis 
produced by assimilating physical and biogeochemica 
variables. Models have 1.5 km resolution for physics and 
wave, and 7 km for biogeochemistry. The frequency of the 
products is of 15 minutes, hourly or daily means depending 
an the system and variables. 
The reanalysis is based on a 7 km coupled physics- 
biogeochemistry model assimilative system and covers 
the period from 1993 until one year before present. The 
wave reanalysis timeseries has a longer time coverage, 
starting from 1980 and has a resolution of 1.5 km, like the 
forecast product. The product has a temporal resolution of 
3-hour. 
The reanalysis timeseries are extended biannually anc 
monthly (lower quality product) to minimize the gap from 
the end of the timeseries to present. 
"he physical variables provided by the NWS-MFC forecast 
and reanalysis products are temperature, salinity, 
mixed layer depth, currents, sea surface height. The 
biogeochemical fields are Chlorophyll, nitrate, phosphate, 
axygen, phytoplankton biomass, net primary production, 
light attenuation coefficient, pH and the partial pressure 
»f CO,. The wave products consist of wave parameters 
"ntegrated from the two-dimensional (frequency, direction) 
Nave spectrum. More details are available on the Copernicus 
Marine Web page.