osa = 6.6% everywhere !!! everytime !!! ocean colors:
TRANSCRIPT
OSA = 6.6%
EVERYWHERE !!!EVERYTIME !!!
Ocean colors:
OSA: main idea
Some variables affect ocean surface dynamics.
Some others affect 0cean Surface Albedo.
Is there common variables ?
YES: wind speed, surface chlorophyll
How proceed ?First (small) step…
Jin et al. (2004) algorithm.
Cos(Solar Zenithal Angle)
Optical depth (m-1)
Adaptation : no optical depth dependencyRadiative model column
OSA: first test
How OSA-biophysical interactions impact chlorophyll concentrations at surface ?
Off-line simulations with PISCES forced by monthly means of the coupled climate model IPSLCM5A on the historical period
1.On-line albedo is computed from PISCES chlorophyll at surface
2.On-line albedo modifies the solar radiation input
SE
AW
IFS
HIS
TO
RIC
AL
CH
LO
RO
PH
YL
L (
mg
/m3)
SE
AW
IFS
AL
BE
DO
CH
LO
RO
PH
YL
L (
mg
/m3)
OSA: second test
How OSA-biophysical interactions impact ocean physics ?
On-line simulations with ORCA2-LIM-PISCES forced by CORE Climatological FORCING Package
1.On-line albedo is computed from climatology of surface chlorophyll (CORE) and climatology of wind speed (CORE)
2.On-line albedo modifies the solar radiation input
OSA CORE Min: 6.02%Max: 9.5%
Mar Jun Dec
Summer Summer
Oct
Winter
OSA CORE – Southern Ocean Temporal
Variability
OSA CORE – Impact on Surface Temperature
Con
trol
Alb
edo=
f(C
hl+
win
d)
Alb
edo=
f(w
ind)
Southern Ocean Seasonal CycleControl
Albedo=f(W)
Albedo=f(Chl,W)
OSA CORE – Impact on Mixed Layer Depth
Con
trol
Alb
edo=
f(C
hl+
win
d)
Alb
edo=
f(w
ind)
Control
A=f(W)
A=f(Chl,W)
Southern Ocean Seasonal Cycle
To be continued…Question ?