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Maren Moltke Lyngsgaard
Marine biologist from Aarhus University
PhD Project: Climate change impacts on primary production dynamics
in inner Danish waters
July 2009 – July 2012
Supervisors:
Katherine Richardson (University of Copenhagen)
Michael Olesen (University of Copenhagen, Helsingor)
Stiig Markager (National Environmental Research Institute)
Torben Vang (Aarhus University)
MAREN MOLTKE LYNGSGAARD
UNIVERSITY OF COPENHAGEN
1
ECODYN:
Participants:
National Environmental Research Institute (NERI), Aarhus University (AU), Danish
Meteorological Institute (DMI), University of Copenhagen, DTU-Aqua
• Overall project title: Influence of ecological dynamics and
climate change on the marine environment in Danish waters.
• My project title: The influence of climate change on primary
production dynamics in inner Danish waters.
MAREN MOLTKE LYNGSGAARD
UNIVERSITY OF COPENHAGEN
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Why?
MAREN MOLTKE LYNGSGAARD
Hansen & Manscher 2008
3
UNIVERSITY OF COPENHAGEN
Oxygen concentration in
2003
Oxygen concentration in
2100
2100-2003 difference:
August
MAREN MOLTKE LYNGSGAARD
Hansen & Bendtsen 2006
UNIVERSITY OF COPENHAGEN
September
4
September
• Model results of a 30%
reduction in the export of
organic material to bottom
waters predicts less
oxygen Deficiency in the
future.
2003
2100
• Strong relationship
between export production
and oxygen use.
2100-2003
Difference
MAREN MOLTKE LYNGSGAARD
Hansen & Bendtsen 2006
5
UNIVERSITY OF COPENHAGEN
This PhD project includes 2 leading questions:
1.
2.
Temperature sensitivity of subsurface photosynthesis.
1.
Measure primary production dynamics in total watercolumn and
subsurface peaks
2.
Estimate biological export
Match-mismatch relationship between plankton groups.
1.
2.
Identify phytoplankton spring bloom kick off
Identify zooplankton kick off and a possible climate induced
mismatch
Phytoplankton
Zooplankton
Abundance
Time of year
MAREN MOLTKE LYNGSGAARD
UNIVERSITY OF COPENHAGEN
6
What influences primary
production in inner Danish
waters?
Time series
analyses
Do we see any climate related
impact on primary
production today?
How big an influence does the methods used
have on possible climate change signals?
Detection of seasonal changes on primary production
and export of organic material in the year 2010
Detection of phyto- and
zooplankton kick off in spring time.
MAREN MOLTKE LYNGSGAARD
Field Work/
survey
UNIVERSITY OF COPENHAGEN
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Field work
Achievements
Oxygen
production
2010
January
February
March
April
May
June
July
August
September
October
November
December
Oxygen
use
MAREN MOLTKE LYNGSGAARD
UNIVERSITY OF COPENHAGEN
8
Gold: Improve model inputs
On primary production dynamics
Thanks for listening 
MAREN MOLTKE LYNGSGAARD
UNIVERSITY OF COPENHAGEN
9
0m
Chlorophyll
Max
10 m
CTD profiles on water chemistry, physics
and biology.
This supplemented by fast repetition rate
Fluorometry (FRRF)
20 m
Discrete sampling
14C
Primary Production
FRRF II
Station 1. Aarhus
Station 2. Helsingor
CTD Profile
Triaxus Profile
Depth (m)
30 m
Remineralisation measurements
or sediment traps?
LOPC mounted
diretly on the Triaxus
Distance (nm)
MAREN MOLTKE LYNGSGAARD
UNIVERSITY OF COPENHAGEN
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