MERCATOR OCEAN JOURNA: 
SEPTEMBER 2021 
organic materials (e.g., nitrate, phosphate, silicate) to force 
the model. To remedy this situation we will test the use 
of NRT river discharges delivered by NIHWM. In Region 7 
(transition between the North West Shelf (NWS) and the 
open sea), the model and observations are very close 
The nominal product for BS-BIO MY [11] provides simulation 
for the past reconstruction of the biogeochemical ocean 
state in the Black Sea. Since Jul 2020, a new timeseries 
of 27 years (from 1992 to 2019) with the upgraded NEMO- 
BAHMB! modelling framework has been released to 
users. The system is forced by ECWMF ERA5 reanalysis 
atmospheric fields. 
hl-A [mg/m3] - Region 1 
Chl-A [mg/m3] - Region z 
Chl-A [mg/m3] - Region 3 
| x 
1.0 
Fr 
\ } 
Mn 
„n 
D.0 
3 D 
rn 
OD 
"27017 
Chl-A [mg/m3] - Region 5 
Bl 
‚19 
2017 
18.0 
16.0 
14.0 
12.0 
'0.0 
3.0 
5.0 
20. 
3317 
ar 
Chl-A [mg/m3] - Region 6 
Als 
Mm 
019 
2019 
3.5 AL 
0 L 
2017 
1.0 
ze 
0 
xx 
ın 
16 
2017 
AL r - 
Chl-A [mg/m3] - Region 7 
ft 
Mn 
N16 
‘br - 0C13 
Marla! _ R&-BIO NRT 
Agure k: timeseries of satellite (in blue) and model {in red) Chlorophyll spatial averages computed for (top row) open sea sub-regions 1, 2 and 
3, and (bottom row) NWS regions 5. 6 and 7. Sub-recions limits are shown in Fiaure 5 
Hack Sea regions and observations locations 
= 
> 44 
o 
© 
B 
& 43 
ı 1 
40 L— 
"RR 
A a 
"ae 3 
32 M 36 38 
Longitude (°E) 
40 
72 
‚gure 9: Sub-Regions (based on [12]) used for computing error statistics for Chlorophyll. Regions 1-3 are the “open sea”, regions 4-5 is the 
North-Western Shelf and region 7 is located at the shelf break and is considered as a transition region between eutrophic and oligotrophic 
conditions