MERCATOR OCEAN JOURNA:
SEPTEMBER 2021
55T mean difference (forecast-observation)(*C) summer (JAS} 2014
6 A
30°N
50°N
30°M EL
SON |
4]
| 60°N ı
50°N
7
A0°N
4 40°wE
ıl
}40°N
—-
30°N
A) 2015 release -
Sequentlal restart A30°N
b) 2016 release
Spectral nudaina
I
18”W 12°W 6°W 0° 6°E
A
18°W 12° 6°W 00° BS°E
= A EN ——
-2.00 -1.5 -1.00 -0.5 0.25 0.75 LU
1.8
30°N
‚ 6) 2018 release
Data assimilation
— Lu DD
18°W 12° W GW 0° G°E
„igure 1: SST differences between IBI-PHY-NRT solutions and satellite observations (CMEMS L3 satellite product 010_009%a) for Summer
‚JAS) 2014. IBI data from (a) the 2015 system version (with periodic sequential forecast re-initialization from the CMEMS Global solution); (b)
the 2016 system version (with spectral nudging to the Copernicus Marine Service Global solution) and (c) the 2018 system version (already
with data assimilation scheme)
2. The IBI-MFC biogeochemical analysis/forecast/
hindcast component:
A physical-biogeochemical coupled model system, based
on a NEMO-PISCES 136° model application, was developed
to forecast ocean dynamics and marine ecosystems in the
IBI area. The first IBI BIO NRT forecast system was set up
in 2017, providing weekly forecast products. Then, different
specific upgrades were applied in this IBI BIO forecast
systems such as:
NEMO-PISCES model upgrade,
improvement of carbon cycle with surface spCO,
boundary reflecting anthropogenic inputs,
inclusion of additional nutrient inputs for rivers (EEA
data),
setup of a new formulation for permanent burial to
the sediment,
improvement of initial and boundary conditions.
The catalogue product list has also been expanded,
including now the main biogeochemical variables
(Chlorophyll, oxygen, iron, nitrate, ammonium, phosphate,
silicate, net primary production, euphotic zone depth)
and variables related to the carbon cycle (surface partial
pressure of carbon dioxide, dissolved Iinorganic carbon and
pH). These upgrades have resulted in an enhancement of
the IBI NRT BIO product quality (Figure 2). Gutknecht et al,.,
‘2019) presents more consistency and skill assessment
information of the IBI PISCES biogeochemical mode'
'comparing data from a 7-year qualification simulation to
available satellite estimates as well as in situ observations
from ICES, EMODnet and BGC-Argo). The IBI NRT BIO
forecast system is now capable of reproducing the
main biogeochemical and ecosystem features of the IB
area, successfully capturing the spatial distribution and
szeasonal cycles of oxygen, nutrients, Chlorophyll, and
net primary production. The product provides a greater
understanding of today’s state (and changes) in the marine
biogeochemistry of European waters.
Since the beginning of Copernicus 1, the IBI-MFC has
delivered a BIO MY product derived from a regional
high-resolution 1/12° non-assimilative biogeochemical
hindcast. This IBI BIO hindcast model application is online
zoupled to the IBI MY physical reanalysis, and nested into
the Global BIO MY product. In the last 6 years, this IBI BIO MY
system was upgraded to be consistent with the IBI PHY MY
system, extending their temporal coverage from 1993 til
present time. The NEMO-PISCES model code was updated
in parallel to the upagrades performed in the NRT BIO
