marcel babin simon bélanger - arcticnet › pdf › talks2010 › babinmarcel.pdfmarcel babin &...
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![Page 1: Marcel Babin Simon Bélanger - ArcticNet › pdf › talks2010 › BabinMarcel.pdfMarcel Babin & Simon Bélanger Canada Excellence Research Chair « Takuvik » Joint Laval University](https://reader030.vdocuments.site/reader030/viewer/2022040615/5f0e69ef7e708231d43f20db/html5/thumbnails/1.jpg)
Pan-Arctic primary production: State-of-the-Art on estimation from ocean color remote sensing data
Marcel Babin
& Simon BélangerCanada Excellence Research Chair
« Takuvik »Joint Laval University / CNRS LaboratoryLaval University, Quebec City, Canada
Département de Biologie, Chimie et GéographieUniversité du Québec à Rimouski
Rimouski, Canada
And contributions from Flavienne Bruyant (CERC) and Yannick Huot (U. Sherbrooke)
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Outline
1.
Description of our PP algorithm
2.
Discussion on limitations
3.
Results on magnitude and trends in pan‐ Arctic PP
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Methods
–
Primary
production
Rationales
behind
our
Primary
Production Model
• « Case 1
»
optical
parameterizations
and algorithms are not valid
in the Arctic
Ocean
• A spectral approach
is
necessary
for light propagation and absorption by phytoplankton, because
of
competition
with
CDOM
and NAP
• An regional
parameterization
of photosynthetic parameters
must be
adopted
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Methods
–
Primary
production model
Standard ocean
color
chl
products
are not reliable
in the Arctic
Ocean
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Methods
–
Primary
production model
Standard ocean
color
chl
products
are not reliable
in the Arctic
Ocean
June
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Methods
–
Primary
production model
Standard ocean
color
chl
products
are not reliable
in the Arctic
Ocean
![Page 7: Marcel Babin Simon Bélanger - ArcticNet › pdf › talks2010 › BabinMarcel.pdfMarcel Babin & Simon Bélanger Canada Excellence Research Chair « Takuvik » Joint Laval University](https://reader030.vdocuments.site/reader030/viewer/2022040615/5f0e69ef7e708231d43f20db/html5/thumbnails/7.jpg)
Methods
–
Primary
production model
Globcolour
(1998‐2007)Monthly
GSM a
(443)Globcolour
(1998‐2007)Monthly
GSM a
(443)
ChlChl
Globcolour
(1998‐2007)Monthly
Lw
()Globcolour
(1998‐2007)Monthly
Lw
()
a
()a
()
Matsuoka et al. (2007)
Matsuoka et al. (2007) Lee et al. (2005)Lee et al. (2005)
SBDART
(RT
code)ISSCP
cloud
, [cloud], ozone)
SBDART
(RT
code)ISSCP
cloud
, [cloud], ozone)
K
d
()Kd
()
E
d
(, 0+, t)Ed
(, 0+, t)
E
d
(, z, t)Ed
(, z, t)
PUR(z, t)PUR(z, t) PUR(z)PUR(z)
Arrigo
et al. (1998)Arrigo
et al. (1998)
E
K
(PUR)EK
(PUR)P
b
max= 2Pbmax= 2
PP( z,t ) Chl PB
max 1ePUR( z ) EK ( PUR ) See www.globcolour.info
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Methods
–
Primary
production model
Globcolour
(1998‐2007)Monthly
GSM a
(443)Globcolour
(1998‐2007)Monthly
GSM a
(443)
ChlChl
Globcolour
(1998‐2007)Monthly
Lw
()Globcolour
(1998‐2007)Monthly
Lw
()
a
()a
()
Matsuoka et al. (2007)
Matsuoka et al. (2007) Lee et al. (2005)Lee et al. (2005)
SBDART
(RT
code)ISSCP
cloud
, [cloud], ozone)
SBDART
(RT
code)ISSCP
cloud
, [cloud], ozone)
K
d
()Kd
()
E
d
(, 0+, t)Ed
(, 0+, t)
E
d
(, z, t)Ed
(, z, t)
PUR(z, t)PUR(z, t) PUR(z)PUR(z)
Arrigo
et al. (1998)Arrigo
et al. (1998)
E
K
(PUR)EK
(PUR)P
b
max= 2Pbmax= 2
PP( z,t ) Chl PB
max 1ePUR( z ) EK ( PUR ) See www.globcolour.info
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Methods
–
Primary
production model
Globcolour
(1998‐2007)Monthly
GSM a
(443)Globcolour
(1998‐2007)Monthly
GSM a
(443)
ChlChl
Globcolour
(1998‐2007)Monthly
Lw
()Globcolour
(1998‐2007)Monthly
Lw
()
a
()a
()
Matsuoka et al. (2007)
Matsuoka et al. (2007) Lee et al. (2005)Lee et al. (2005)
SBDART
(RT
code)ISSCP
cloud
, [cloud], ozone)
SBDART
(RT
code)ISSCP
cloud
, [cloud], ozone)
K
d
()Kd
()
E
d
(, 0+, t)Ed
(, 0+, t)
E
d
(, z, t)Ed
(, z, t)
PUR(z, t)PUR(z, t) PUR(z)PUR(z)
Arrigo
et al. (1998)Arrigo
et al. (1998)
E
K
(PUR)EK
(PUR)P
b
max= 2Pbmax= 2
PP( z,t ) Chl PB
max 1ePUR( z ) EK ( PUR ) See www.globcolour.info
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Photosynthetic
parameters
Arrigo and Sullivan (1994)
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Photosynthetic
parameters
Rey (1991)
Barents Sea
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Photosynthetic
parameters
Beaufort Sea
Num
ber
PBmax [mg C (mg chl a)-1 h-1] Ek (mole photons m-2 s-1)
~0.5 ~23
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Photosynthetic
parameters
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Methods
–
Primary
production model
Globcolour
(1998‐2007)Monthly
GSM a
(443)Globcolour
(1998‐2007)Monthly
GSM a
(443)
ChlChl
Globcolour
(1998‐2007)Monthly
Lw
()Globcolour
(1998‐2007)Monthly
Lw
()
a
()a
()
Matsuoka et al. (2007)
Matsuoka et al. (2007) Lee et al. (2005)Lee et al. (2005)
SBDART
(RT
code)ISSCP
cloud
, [cloud], ozone)
SBDART
(RT
code)ISSCP
cloud
, [cloud], ozone)
K
d
()Kd
()
E
d
(, 0+, t)Ed
(, 0+, t)
E
d
(, z, t)Ed
(, z, t)
PUR(z, t)PUR(z, t) PUR(z)PUR(z)
Arrigo
et al. (1998)Arrigo
et al. (1998)
E
K
(PUR)EK
(PUR)P
b
max= 2Pbmax= 2
PP( z,t ) Chl PB
max 1ePUR( z ) EK ( PUR ) See www.globcolour.info
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Impact of pixels with
no OC data
Region
Considered Relative difference
between
PP with
OC only, and PP for
all ice‐free areas
All Arctic
waters ‐6.7%
> 60° ‐30%
Arctic
Basin ‐47%
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Results
Latitudecriterion
This study Longhurst et al. (1995)
Behrenfeld & Falkowski (1997)
Antoine et al. (1996)
Pabi et al. (2008)
All Arctic (sensu IHO)
0.62* - - - -
>60° 0.46 - - - -
>66.5° 0.26 - - - 0.42
>70° 0.19 1.4 0.4 0.6 -
* Gt
C y‐1
Primary
Production
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PP : GSM VS OC4v4 for year
2007Region GSM OC4v4 %diff
Greenland 51.9 65 25.2%
Norwegian 97.7 98.3 0.6%
Barents 70.9 80 13%
Kara 24.5 39.5 61%
Laptev 15.3 22 44%
East Sib Sea 16.5 22.7 38%
Chukchi 9.6 14 46%
Beaufort 6.7 11.3 69%
Baffin Bay 11.9 18.1 52%
Hudson Bay 18.3 27.3 49%
Arctic Ocean 14.2 22.4 57%
Circumpolar Arctic: 293 378 29%
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Mean
Anuual
Primary
Production
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Primary
Production trend
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Ice
trend during
the last decadeSpring Summer
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Trend in Chlorophyll
concentration
June July
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What’s
next?
• To better document Arctic Ocean optical properties• To improve and validate algorithms• To address the DCM
problem
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Zeu
ZmlZN
PPChl
The DCM
in the Arctic
Ocean
At lower latitudes In the Arctic Ocean
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The DCM
in the Arctic
Ocean
Morel & Berthon (1989)
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What’s
next?
• To better document Arctic Ocean optical properties• To improve and validate algorithms• To address the DCM
problem
• To further document phytoplankton photosynthesis• …
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Thank
you!
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Methods
–
Primary
production model
Arctic
waters are optically
dominated
by CDOM
Matsuoka et al. (2007)
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Arctic
waters are optically
dominated
by CDOM
Babin et al. (2003)
560 nm
412 nm 490 nm
510 nm
443 nm
a
aCDOM aNAP
AtlanticAdriaticBalticEng. ChannelMediterraneanNorth Sea
Methods
–
Primary
production model
a
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Methods
–
Primary
production model
Matsuoka et al. (2007)
a * is
generally
lower
in the Arctic
Ocean
because
of the light regime
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Est
imat
edK
d(49
0) (m
-1)
Doron et al. (2007)
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ResultsPrim
aryProd
uctio
n (Gt C
y‐1)
1.05 Gt C y‐1
1.03 Gt C y‐1