the aquatic physics group
TRANSCRIPT
The Aquatic Physics Group
Lakes, reservoirs and rivers are important resources and habitats, and are ultimately linked to the terrestrial ecosystem. The physical transport of substances (oxygen, nutrients, heat, pollutants) within these aquatic systems and across interfacesdefines their ecological “health” and functioning. The Aquatic Physics Group utilizes state-of-the-art field measurements combined with system analytics and modeling to explore these important physical processes and their impacts.
Group leader :Prof. Daniel F. McGinnis
Our research methods in aquatic systems
2 Multiparametric probe,
water sampling3 Gas fluxes1 Moorings:
T, O2, CO2, CH4, ADV, ADCP
6 Porewater gas concentration 5 Benthic fluxes
[email protected] http://www.unige.ch/forel/en/physique-aqua/
40
30
20
10
0
0.0 0.2 0.4 0.6
Methane (mol L-1)
De
pth
(m
) CH
4 (mol L
-1)
5 10 15 20 25
Temperature (oC)
50 100 150 200
O2 (% Sat)
0 2 4 6 8 10 12 14
Chla (g L-1)
0 2 4 6 8 10 12 14
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
CH4
me
tha
ne
(p
pm
)
time elapsed (minutes)
400
420
440
460
CO2
ca
rbo
n d
ioxid
e (
pp
m)
1 Moorings
3 Gas fluxes
2 Profiles
6 Sediment
biogeochemistry
5 Benthic fluxes
4 Funnels
Mass spectrometry: composition of gasbubbles
Group members : Dominic Vachon (PostDoc)Timon Langenegger (PhD student)Daphne Donis (PostDoc)
Dep
thin
se
dim
ent
(mm
)
Dissolved O2 (µmol L-1)
O2 diffusive flux
Daily migration of C.Flavicans in Lake Hallwil
-80 -60 -40 -20 0
40
30
20
10
0
13
CH4
CH4
de
pth
in s
ed
ime
nt (c
m)
13
C (‰)
2000 4000 6000 8000 10000 12000
CO2
13
CO2
gas concentration (mol L-1)
Dep
thin
se
dim
ent
(cm
)
Concentration (µmol L-1) Oxygen microprofiles
DarkLight
4 Ebullition rates