molten monitoring long-term trends in eutrophication and nutrients in the coastal zone
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MOLTEN. *. *. *. MOLTEN MOnitoring Long-term Trends in Eutrophication and Nutrients in the coastal zone. Determination of reference conditions in coastal and transitional water. Richard Telford Geography Department, Newcastle University Stephen Juggins Annemarie Clarke Simon Drew - PowerPoint PPT PresentationTRANSCRIPT
MOLTENMOnitoring Long-term Trends in Eutrophication and Nutrients in the coastal zone
Richard Telford Geography Department, Newcastle UniversityStephen Juggins Annemarie ClarkeSimon Drew
Elinor Andren Uppsala University, Sweden
Kaarina WeckströmECRU, University of Helsinki, FinlandAtte Korhola
John Anderson Institute of Geography, Copenhagen University, DenmarkMarianne Ellegaard
Victor de Jonge Dept. Marine Biology, Groningen University, The Netherlands
Heikki Pitkänen Finnish Environment Institute, Finland
Daniel Conley National Environmental Research Institute, Denmark
Determination of reference conditions in coastal and transitional water.
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Good Status
The values of the biological quality elements for the surface water body type show low levels of distortion resulting from human activity, but deviate only slightly from those normally associated with the surface water body type under undisturbed conditions.
Table 1.2. General definition for rivers, lakes, transitional waters and coastal watersL 327/38 22.12.2000 Official Journal of the European Communities
Normative definitions of ecological status classifications
…undisturbed conditions
• How can they be defined?
• Quantitative palaeoecology
• Transfer functions
• Multiproxy study
The MOLTEN approach
•Stable isotopes•Pigments•Dinoflagellates•Forams•Diatoms
Actin
opty
chus
sena
rius
Cyclo
tella
cho
cta
whatc
heea
na
Thala
ssio
sira
baltic
a
Hya
lod
iscus
scot
icus
Dim
me
reg
ram
ma
min
or
Rhop
alo
dia
gib
ba
Opepho
ra o
lseni
iDip
lone
is sm
ithii
Nitz
schi
a fi
liform
is
Cocc
oneis
scut
ellu
m
1950
1930
1970
1900
1980
1996
Contemporary water chemistry
Modern diatoms
Calibration dataset
Surface Sample
Fossil diatoms
Sediment core
Transfer Function
Reconstruction
Transfer Function?
Molten Sites
Molten Statistics
Number of Sites 226
Number of Species 852 328 >1%
Salinity ‰ 0.05 31.7
TN g/l 231.8 3890
TP g/l 14.5 463.2
Min Max
Depth m 0.5 50.5
Species response: Rhoicosphenia curvata
pr o
po
rti o
n
5 10 15 20 25 30
0.0
0.0
10
.02
0.0
30
.04
0.0
5
LSalinity (‰)
pro
po
rtio
n
1.4 1.6 1.8 2.0 2.2 2.4 2.6
0.0
0.0
10
.02
0.0
30
.04
0.0
5
LTP (µg/l)
pro
port
ion
2.4 2.6 2.8 3.0 3.2 3.4 3.6
0.0
0.0
10.
02
0.0
30
.04
0.05
LTN (µg/l)
Species response: Cymatosira belgica
pro
porti
on
5 10 15 20 25 30
0.0
0.05
0.10
0.1
50.
20
LSalinity (‰)
prop
ortio
n
1.4 1.6 1.8 2.0 2.2 2.4 2.6
0.0
0.05
0.10
0.15
0.20
GTP (µg/l)
prop
ortio
n
2.4 2.6 2.8 3.0 3.2 3.4 3.6
0.0
0.05
0.10
0.15
0.20
GTN (µg/l)
-3.0
-2.0
-1.0
0.0
1.0
2.0
Ax
Depth
NOn
NH4
TN
PO4
TPChl-a
Secchi Depth
Salinity
Oxygen
NO:POn4
-2.0 -1.0 0.0 1.0 2.0 3.0
Axis 1
is 2
Danish Dataset : CCA biplot showing sites
% Variation explained
total unique
Depth 9.0 6.6
Salinity 6.5 5.3
Secchi 6.2 2.7
NH4 4.9 3.3
TN 4.7 2.5
Predicted vs. measured TN for Danish dataset
RMSE = 0.008 r2 = 0.9
RMSEP = 0.13 r2 = 0.71
Log 1
0 D
iato
m-in
ferr
ed T
N
Log10 Measured TN
Application of the Transfer Function: Roskilde Fjord
Infe
rred
Total
Nitrog
en
Roskilde Fjord Diatom Stratigraphy
http://Craticula.ncl.ac.uk:8000
Conclusions
•There is a significant relationship between diatoms and TN in Coastal and Transitional waters.
•This can be used to estimate background TN levels.
•TN almost doubled in Roskilde Fjord between 1956 and 1995.
•This methodology is being applied to new sites.