van Leeuwen et al.
Two model systems (JRC and SMHI) were suffering from quite high
RMSD values, although these were mostly caused by just a few areas
(mainly small estuarine/coastal areas with high inputs and
‚.nsufficient spatial resolution in the models).
2.4 Assessment areas
As models differed in their spatial resolution and domain coverage,
evaluation and comparison to observations were applied per area. Here,
we use the areas as defined by OSPAR for use in the 4” application of
:he Common procedure (COMP4, Enserink et al, 2019; OSPAR,
2022b). The areas are based on the eco-hydrodynamic regimes as
defined by van Leeuwen et al. (2015), refined in the JMP-EUNOSAT
project (Enserink et al., 2019) and by the OSPAR contracting parties
10.3389/fmars.2023.1129951
(OSPAR, 2022a). The area delineation is given in Appendix C, and can
be seen in Figure 3. Model results were included in the ensemble mean
for an assessment area if the model domain covered 80% or more of the
area. As a result, different assessment areas were covered by different
numbers of models (Figure 3). For two areas model results have been
'ncluded despite insufficient domain coverage: the Atlantic area (ATL,
UHH-HZG 59.5% coverage) and the Northern North Sea area (NNS,
SMHI 78% coverage). The areas included for the individual models are
visible in Supplementary Figures 5-7 in Appendix F. Areas with the
highest model coverage are the river plumes in the Southern Bight of
the North Sea (Scheldt plume 1 and 2, Meuse plume, Rhine plume,
‚nset) and those in the northern part of the English Channel.
Maximum number of models contributing is 7, as Cefas was unable
to provide results for the pre-eutrophic scenario due to technical issues.
However, Cefas did contribute to the harmonization effort,
# models
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Longitude [deg. E]
ATL: Atlantic
LCTI: Channel Coastal Shelf
Tidally Influenced
CWMTI: Channel Well Mixed
Tidally Influenced
ELPM: Elbe Plume
ENS: Eastern North Sea
HPM: Humber plume
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15
MPM: Meuse Plume
NNS: Northern North Sea
RHPM: Rhine Plume
SCHPMI1: Scheldt Plume 1
SCHPM2: Scheldt Plume 2
SNS: Southern North Sea
SPM: Seine Plume
THPM: Thames plume
“IGURE 3
umber of models per assessment area, that have been included in the calculation of area means.
"rontiers in Marine 1cience
frontiersin.org