MERCATOR OCEAN JOURNA: 
SEPTEMBER 2021 
in November 2018 (see Figure 2) and only recently in the 
forecasting system (Figure 1). The impact has been of 
highest importance for preventing an over-estimation of 
Zhlorophyll during the spring bloom (see Figure 3). The 
Zopernicus Marine Service Evolution (SE) project TOSCA 
developed the Phytoplankton Functional Type (PFT) data 
assimilation in the North West-European shelf region 
(Skakala et al., 2018). This evolution has been pulled 
through into the NWS reanalysis system to produce the new 
timeseries released in December 2020. This development 
has not only improved the impact of the data assimilation 
on some phytoplankton types but has extended the 
biogeochemical variables avallable in the catalogue to 
include model PFT Chlorophyll fields. More recently, a 
multi-platform biogeochemical data assimilation study 
has tested the impact of combining ocean colour and glider 
nNeasurements, along with temperature and salinity from 
multiple sources, in a pre-operational configuration of the 
system (Skakala et al., 2021). The interplay between the 
assimilated multi-platform physics and biogeochemistry 
has been strengthened by introducing feedback from 
biogeochemistry to physics showing some early promisine 
NWS Reanalysis evolution 2015-2021 
NEMO v3.4 (7km) | a . 
Assimilation of 55T. | May'2015 | 
4] 
PHY — 
New timeseries 
NEMO updated to 
v3,6, Addition of 
data assimilation of T 
and S profiles 
Novi2018 
el 
WAV — 
f New: addition of a ) 
WAVE model 
component at 1.5km 
k 
| 
= 
1u[!2020 
f 
PHY — 4 1 
New timeseries 8 a 
Forced by ERAS | gee2020 | 
GC 
ERSEM coupled with PHY 
Na data assımilation. 
New timeseries 
ERSEM updated to v 19.04, 
Inclusion of a carbanate 
system for delivery of pH 
and pCO2 products 
Total Chl data assimilation 
AGC 
PHVYV = 
New: Multi Model 
Ensemble product 
New timeseries 
Phytoplankton Functional 
Type data assimilation 
Improved river discharee 
AGC 
DHY - 
3GC — \ 
New: Interim 
product 
] May 2021 
New: interim product 
‚2 ure 2: Maior evolution of the NWS analvsis and forecast components durina Copernicus 1 in chronoloaical order.