Biogeochemical North Sea Climatology
Iris Hinrichs1, Viktor Gouretski1, Johannes Pätsch1,
Kay Emeis1,2, Detlef Stammer1
1CEN
(Center for Earth System Research and
Sustainability), University of Hamburg
2Institute
of Coastal Research, Helmholtz Center
Geesthacht
1
Motivation and Goals
Biogeochemical North Sea Climatology
• Continuation of the NOWESP*data set
• Analysis of data (e.g. annual cycles, trends, natural
variability vs anthropogenic effects)
• Reference and validation data set for biogeochemical
modelling in the North Sea region
• Make data products available for users
* NOWESP: North Western European Shelf Programme, Research Data Base
2
Biogeochemical North Sea Climatology
Set of Parameters:
• Ammonium
• Chlorophyll-a
• Nitrate(+Nitrite)
• Dissolved Oxygen
• Phosphate
• Silicate
• Temperature
• Salinity
65°N
47°N
15°W
bathymetry
(GEBCO)
15°E
Time period: 1960-2014
Spatial dimensions: 3D
KLIWAS
North Sea Climatology *
Manfred; Gouretski, Viktor; Sadikni, Remon; Hinrichs, Iris; (2013): KLIWAS North Sea Climatology of Hydrographic Data
* Bersch,
(Version 1.1); World Data Center for Climate (WDCC). doi:10.1594/WDCC/KNSC_hyd_v1.0
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Data Collection
EMODNet
WOD13
Biogeochemical
North Sea
Climatology
„BROCKMANN“
data
NOWESP
DOD
ICES
PANGAEA
Limitation to
• bottle data
• „CTD“ data
Not included
• „underway“ observations
• mooring data
• high resolution CTD obs.
WOD13: World Ocean Database 2013 EMODNet:European Marine Observation and Data Network NOWESP: North Western European Shelf Programme, Research Data Base
DOD:German Oceanographic Data Centre PANGAEA: PANGAEA Data Publisher for Earth & Environmental Science ICES: International Council for Exploration of the Sea
BROCKMANN: Institute of Biogeochemistry and Marine Chemistry, University of Hamburg, Germany
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Quality control (QC)
• automatic, objective and tunable
• 9 different quality checks applied to all observations
• observations are flagged when failing at least 1 check
• expert quality control in the future
Nitrate
5
Biogeochemical North Sea Climatology
Status (February 2016):
• observational data merged
• phosphate, nitrate and silicate
• quality controlled
• first data products
6
Products
Biogeochemical North Sea Climatology
Different levels of processing:
• Level 0:
Merged and quality checked original data (not for release)
-------------------------------------------------------------------------------------• Level 1:
bin-averaged values (0.25°x0.25°, spatial gaps)
• Level 2:
Interpolated data (spatially complete)
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Overview Original Merged Data
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Overview Original Merged Data
-data density
high
low
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Level 0 product: quality controlled observations
Comparison: QCed observations monthly mean values
Phosphate
*
* courtesy of Biologische Anstalt Helgoland
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Level 0 product: quality controlled observations
Comparison: QCed observations monthly mean values
Phosphate
Helgoland Roads
observations not
included
*
* courtesy of Biologische Anstalt Helgoland
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Level 0 product: quality controlled observations
Comparison: QCed observations monthly mean values
phosphate, time-averaged differrences
1960-2014
Helgoland Roads
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Mean Monthly Phosphate Concentration at 5m depth
Level 1 product
Level 2 product
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Mean Monthly Nitrate Concentration at 5m depth
Level 1 product
Level 2 product
14
Mean Monthly Silicate Concentration at 5m depth
Level 1 product
Level 2 product
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Level 1 product
Nitrate
Phosphate
Silicate
July
Climatological
Concentrations
[1960-2014]
(1/4 degree
binned values)
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Level 2 product
Interpolated monthly mean phosphate concentration (5m, 1960-2014)
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Level 2 product
Interpolated monthly mean nitrate concentration (5m,1960-2014)
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Level 2 product
Interpolated monthly mean silicate concentration (5m,1960-2014)
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Area-averaged monthly mean nutrient concentrations (5m)
based on Level 2 data
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Level 2 product
Climatological Near-Bottom Nutrient Concentrations [1960-2014]
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Biogeochemical North Sea Climatology
Future Perspective:
• Level 1, Level 2: preparation of data products for release
• outstanding parameters: oxygen, chlorophyll-a,
ammonium
• Publications
Technical Report,
Scientific Analysis and Interpretation
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Biogeochemical North Sea Climatology
Future Perspective:
Expansion of data set
observations
data products
parameters
•
• Level 3: Correlations and
ratios
•
DIC
•
SPM
•
alkalinity
more
•
spatial/temporal resolution
•
isopycnically averaged
products
•
timeseries derived from
moorings
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