ncp ( mmol o 2 m -2 d -1 ) bp (mmol c m 2 d -1 ) net ecosystem metabolism in the nw iberian...
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![Page 1: NCP ( mmol O 2 m -2 d -1 ) BP (mmol C m 2 d -1 ) NET ECOSYSTEM METABOLISM IN THE NW IBERIAN UPWELLING SYSTEM ON AN ANNUAL CYCLE C.G.Castro, Arbones B,](https://reader036.vdocuments.us/reader036/viewer/2022062619/55194b80550346c12d8b4568/html5/thumbnails/1.jpg)
nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
100
200
300
400
500N
CP
(mm
ol O
2 m
-2d
-1)
BP
(mm
ol C
m2d
-1)
nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
20
40
60
80
100
bact
eria
l pr
oduc
tion
p
rim
ary
prod
ucti
on
0
20
40
60
80
100
NET ECOSYSTEM METABOLISM IN THE NW IBERIAN UPWELLING SYSTEM
ON AN ANNUAL CYCLE
C.G.Castro, Arbones B, Alvarez-Salgado XA, Alonso-Pérez F, Froján M, Zúñiga D, Teixeira IG, and Figueiras FG
Instituto de Investigaciones Marinas (CSIC)
The 45th International Liège Colloquium13th – 17th May 2013
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Aristegui
Arístegui et al. 2009
CAIBEX: Shelf –ocean exchanges in the Canaries- Iberian LargeMarine Ecosystem
Background
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Northern boundary of the Canary Current upwelling
system
Seasonal variation:
Upwelling: April to September
Downwelling: October to March
Ex(103 m3 s-1 Km-1)
-0.6-0.30.00.30.6
ME
S
A
M
F
E
D
N
O
SA
J
J
M
MO
NTH
Upwelling index (1987-2004)
Courtesy of RMS from PML
UPWELLING
Background
Courtesy of RMS from PML
DOWNWELLING
Upwelling index (103 m3 s-1 Km-1)
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E
Background
High rates of primary production during the upwelling period (2.5 g C m-2 d-1), dominated by large – sized diatoms (Varela et al., 1991; Teira et al., 2001; Figueiras et al., 2001; Tilstone et al., 2003)
Espinoza et al. 2012
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Objectives
To study the fate of fixed carbon based on direct measurements of
gross primary production, pelagic respiration and vertical export of
organic matter and explore the linkage between Production /
Respiration balance and size structure and composition of the
microbial plankton community.
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Methods
Courtesy of RMS from PML
SEAWATER SAMPLES for:
-Nutrients-Size –fractionated chlorophyll (0.2, 2, & 20 µm)-Pico-, Nano- and Microplankton biomass
Net Community Production (NCP) and Community Respiration (CR) by in situ 24 ligh-dark bottle oxygen incubations
Net primary production by in situ 24 incubations of C14
Bacterial production by leucine uptake
Vertical fluxes of organic carbon by in situ 24h deployment of a multitrap
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Tem
pera
ture
(°
C)
Nit
rate
(µm
ol k g
-1)
2008 2009
Nov Dec J an Feb Mar Apr May J un J ul Aug Sep Oct Nov Dec70
50
30
10
dept
h (m
)
Nov Dec J an Feb Mar Apr May J un J ul Aug Sep Oct Nov Dec70
50
30
10
dept
h (m
)
Upw
elli
ng index
(m3 s
-1 K
m-1)
-10000
-5000
0
5000
10000
Hydrographic conditionsResults
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2008 2009
Nov Dec J an Feb Mar Apr May J un J ul Aug Sep Oct Nov Dec70
50
30
10
dept
h (m
)
Nov Dec J an Feb Mar Apr May J un J ul Aug Sep Oct Nov Dec70
50
30
10
dept
h (m
)
Tota
l ch
lor o
phyll
a
(mg m
-3)
Pr i
mary
pro
duc t
ion
(mg m
-3 d
-1)
nov dic ene feb mar abr may jun jul ago sep oct nov dic
Perc
enta
ge c
hl a
0.0
0.2
0.4
0.6
0.8
1.0
nov dic ene feb mar abr may jun jul ago sep oct nov dic
Perc
enta
ge P
P
0.0
0.2
0.4
0.6
0.8
1.0
2008 2009
>20 μm >2 μm >0.2 μm
57%
76%
32%
32%
Results
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Microbial plankton biomass
nov mar jul nov
0
20
40
60
80
100
nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
2000
4000
6000
Autotrophic carbonHeterotrophic carbon
Inte
gra
ted b
iom
as s
(mg C
m-2)
Si z
e c
lass
Cont r
ibuti
on (
%)
2008 2009
Pico- Nano- Micro-
Results
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Production / respiration balance
NC
P
(mm
ol O
2 m
-3d
-1)
CR
(m
mol O
2 m
-3d
-1)
BP
(mg
C m
-3d
-1)
Nov Dec J an Feb Mar Apr May J un J ul Aug Sep Oct Nov Dec70
50
30
10
dept
h (m
)
Nov Dec J an Feb Mar Apr May J un J ul Aug Sep Oct Nov Dec70
50
30
10
dept
h (m
)
Nov Dec J an Feb Mar Apr May J un J ul Aug Sep Oct Nov Dec70
50
30
10
dept
h (m
)
2008 2009
Results
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nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
200
400
600
800
1000
nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
200
400
600
800
1000
nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
200
400
600
800
1000
2008 2009
Vertical Carbon Fluxes
Vert
ical C
arb
on
Fl u
x es
(mg
C m
2d
-1)
Organic carbon
Phytoplanktonic carbon
Diatom carbon
Results
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nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
100
200
300
400
500N
CP
(mm
ol O
2 m
-2d
-1)
BP
(mm
ol C
m2d
-1)
nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
20
40
60
80
100
bact
eria
l pr
oduc
tion
p
rim
ary
prod
ucti
on
0
20
40
60
80
100
NC
P
(mm
ol O
2 m
-2d
-1)
BP
(mm
ol C
m2d
-1)
nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
20
40
60
80
100
bact
eria
l pr
oduc
tion
p
rim
ary
prod
ucti
on
0
20
40
60
80
100
Conclusions
nov dic ene feb mar abr may jun jul ago sep oct nov dic
0
100
200
300
400
500
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6
0
4210.5
NCP (g C m-2 d-1) A
uto
trophic
bio
mass
Hete
rotr
ophic
bio
mass
0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0
% M i c r o p l a n c t o n
0 . 5
1 . 0
1 . 5
2 . 0
2 . 5
Conclusions
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NCP 0.5 ±0.5
Respiration0.5 ±0.3
Respiration0.07 ±0.03
Carbon flux0.29 ±0.02
DOWNWELLING SEASON
58%
50%
24%
NCP 2.1 ±2.0
Respiration0.9 ±1.0
Respiration0.2 ±0.1
Carbon flux0.4 ±0.2
UPWELLING SEASON
ap
hoti
c zo
ne
photi
c zo
ne
19%
70%
50%
Conclusions
g C m-2 d-1
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Thank you for your attention