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Assimilation of chlorophyll and nutrients into a 3-D marine carbon cycle model (NASA-Carbon cycle)

 

11 section parameter optimizations


In these experiments, ecosystem parameters are varied seasonally and regionally to fit the SeaWiFS chlorophyll data.  For this purpose the ocean model domain is divided into eleven sections.

ocean sections
Figure 1 Plot of global ocean regions based in ocean basin distribution

The regional variation of ecosystem parameters resulted in a better performance of the carbon cycle model  with a significantly reduced misfit between the simulated and the observed chlorophyll concentration. The a  posteriori model-data misfit in the Southern Ocean remains relatively high in the Spring season assimilation (Figure 2c).  The optimization also improves the chlorophyll simulation in the equatorial Atlantic and Indian Ocean, as well  as in the southern Indian Ocean. A distinguishable improvement also occurred in the North Pacific region  where the a posteriori chlorophyll concentration increased significantly. The optimized ecosystem parameters  are listed in Table 1. Almost all of the assimilation experiments yielded lower zooplankton grazing rates.

Pi

 

NOPA

NOAT

MIPA

MIAT

EQIN

EQPA

EQAT

SOIN

SOPA

SOAT

SOOC

NOPA

NOAT

Mean

Var

P1

Spring

1.05

1.00

1.00

1.00

1.00

1.00

1.01

1.00

1.01

1.00

1.00

1.05

1.00

1.01

0.00

P2

2.15

1.00

1.07

1.04

1.10

1.02

1.64

1.11

1.11

1.11

1.03

2.15

1.00

1.22

0.13

P3

0.00

0.99

0.99

0.97

1.00

1.00

1.07

0.99

1.00

1.00

1.00

0.00

0.99

0.91

0.09

P4

0.00

0.78

0.71

0.69

0.97

0.99

0.95

0.88

0.90

0.90

0.91

0.00

0.78

0.79

0.08

P5

0.00

0.99

0.83

0.90

0.94

0.98

0.09

0.93

0.92

0.86

1.05

0.00

0.99

0.77

0.13

P6

0.00

0.99

0.87

0.91

0.92

0.99

0.48

0.87

0.91

0.88

0.95

0.00

0.99

0.80

0.09

P7

0.00

0.99

0.86

0.91

0.85

0.99

0.00

0.94

0.89

0.89

1.04

0.00

0.99

0.76

0.14

P8

1.23

1.00

1.01

1.01

1.02

1.00

1.13

1.02

1.02

1.02

1.00

1.23

1.00

1.04

0.01

P9

1.03

1.00

1.00

1.00

1.01

1.00

1.02

1.00

1.00

1.00

1.00

1.03

1.00

1.01

0.00

P10

2.45

1.02

1.06

1.05

1.04

1.01

1.21

1.03

1.08

1.02

1.00

2.45

1.02

1.18

0.18

P11

3.56

1.12

1.01

1.04

0.90

1.00

0.81

1.13

1.01

1.05

1.12

3.56

1.12

1.25

0.60

P12

0.00

0.99

1.00

0.79

1.03

0.92

0.82

0.02

0.66

0.74

0.00

0.00

0.99

0.63

0.18

P1

Fall

1.00

1.00

1.01

1.00

1.00

0.99

1.01

1.00

1.00

1.00

1.00

1.00

1.00

1.00

0.00