Global POC Distribution using Ocean Color and WOCE/JGOFS Beam Attenuation & POC Data

Global POC Distribution using Global POC Distribution using Ocean Color and WOCE/JGOFS Ocean Color and WOCE/JGOFS Beam Attenuation & POC DataBeam Attenuation & POC Data

Wilford D. GardnerWilford D. GardnerAlexey V. MishonovAlexey V. MishonovMary Jo RichardsonMary Jo Richardson

Department of Oceanography,Department of Oceanography,Texas A&M University, College StationTexas A&M University, College Station

WOCE/JGOFS & other data

Regional cp/POC RegressionsAtlantic Pacific

Ross Sea

Arabian Sea

0 1 2 3 4 5 6 7 8C p , m -1

0

5 00

10 00

15 00

20 00

PO

C, m

g C

m-3

g )R oss Sea

M odel II

0 0.2 0.4 0.6 0.8 1C p , m -1

0

50

1 00

1 50

2 00

2 50

PO

C, m

g C

m-3

f)A rabian Sea

M odel II

0 0.4 0.8 1.2 1.6 2C p, m -1

0

1 00

2 00

3 00

4 00

5 00

PO

C, m

g C

m-3

h )APFZ

M odel II

0 0.1 0.2 0.3 0.4 0.5C p, m -1

0

25

50

75

1 00

1 25

PO

C, m

g C

m-3

e)EqPac, TT012

M odel II

0 0 .05 0.1 0 .15 0.2C p , m -1

0

10

20

30

40

50

PO

C, m

g C

m-3

d )H O T

M odel II

0 0.1 0.2 0.3 0.4C p , m -1

0

20

40

60

80

1 00

PO

C, m

g C

m-3

c )BA TS

M odel II

0 0.2 0.4 0.6 0.8 1C p , m -1

0

50

1 00

1 50

2 00

2 50

PO

C, m

g C

m-3

b )C M O -96

M odel II

0 0.2 0.4 0.6 0.8 1 1.2C p , m -1

0

1 00

2 00

3 00

PO

C, m

g C

m-3

a )N AB E

M odel II

SAVE Data Set: Dec-Apr 1987-89

-6 0° -4 0° -2 0° 0° 2 0°

-6 0°

-4 0°

-2 0°

0°

-6 0° -4 0° -2 0° 0° 2 0°

-6 0°

-4 0°

-2 0°

0°

-6 0°

-4 0°

-2 0°

0°

C alcula tedOn e A tte nu atio n De pth , m

M ean POCwith in on e atten uatio n de pth, m g m -3

M ea n Bea m a tte nua tionw ith in on e atten ua tio n de pth; Cp , m -1

0

5

1 0

1 5

2 0

2 5

3 0

3 5

3 0

5 0

7 0

9 0

11 0

13 0

15 0

17 0

19 0

21 0

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

0 1 00 2 00 3 00P O C, mg C m -3

0

0.2

0.4

0.6

0.8

1N ABE

N ABE, M od.II

B ATS

B ATS, M od.II

N ABE+BATS M od.II

0 20 40

0

0.1

0.2

a) b)

c ) d)

-8 0°

-7 0°

-6 0°

-5 0°

-4 0°

-8 0°

-7 0°

-6 0°

-5 0°

-4 0°

-19 0° -18 0° -17 0° -16 0° -19 0° -18 0° -17 0° -16 0°

-8 0°

-7 0°

-6 0°

-5 0°

-4 0°

-8 0°

-7 0°

-6 0°

-5 0°

-4 0°

0m

5m

10m

15m

20m

25m

30m

35m

40m

APFZ Data Set: Dec’97-Mar’98

k6 k7n k7s

k8 k9n k9s

OAD, m

Global One Attenuation Depth (OAD)

- 1 8 0 ° - 1 6 0 ° - 1 4 0 ° - 1 2 0 ° - 1 0 0 ° - 8 0 ° - 6 0 ° - 4 0 ° - 2 0 ° 0 ° 2 0 ° 4 0 ° 6 0 ° 8 0 ° 1 0 0 ° 1 2 0 ° 1 4 0 ° 1 6 0 ° 1 8 0 °- 8 0 °

- 6 0 °

- 4 0 °

- 2 0 °

0 °

2 0 °

4 0 °

6 0 °

8 0 °

5 m

1 0 m

1 5 m

2 0 m

2 5 m

3 0 m

3 5 m

-180° -160° -140° -120° -100° -80° -60° -40° -20° 0° 20° 40° 60° 80° 100° 120° 140° 160° 180°-80°

-60°

-40°

-20°

0°

20°

40°

60°

80°

Summer

Winter

z, m

SeaWiFS products vs cp regressions: SAVE () & APFZ () Data

0 4 8 12CH K ,mg m -2

0.1

1

c p,

m-1

0.2 0.4 0.6 0.8 1L W N(5 5 5 ), mW cm -2 m -1 sr-1

0.1

1

c p,

m-1

0 .04 0 .08 0 .12 0 .16K 490 , m -1

0.1

1

c p,

m-1

b )

0 0.4 0.8 1.2 1.6Ch l, mg m -3

0.1

1

c p,

m-1

a )

Chlorophyll concentration, mg m-3

Diffuse attenuation

coefficient K490, m-1

Normalizedwater-leavingradiance LWN(555),mW cm-2 m-1 sr-1

Integrated Chlorophyll CHK,

mg m-2

Global Beam Attenuation for OAD

Summer

Winter

-180° -160° -140° -120° -100° -80° -60° -40° -20° 0° 20° 40° 60° 80° 100° 120° 140° 160° 180°-80°

-60°

-40°

-20°

0°

20°

40°

60°

80°

- 1 8 0 ° - 1 6 0 ° - 1 4 0 ° - 1 2 0 ° - 1 0 0 ° - 8 0 ° - 6 0 ° - 4 0 ° - 2 0 ° 0 ° 2 0 ° 4 0 ° 6 0 ° 8 0 ° 1 0 0 ° 1 2 0 ° 1 4 0 ° 1 6 0 ° 1 8 0 °- 8 0 °

- 6 0 °

- 4 0 °

- 2 0 °

0 °

2 0 °

4 0 °

6 0 °

8 0 °

0 . 0 5

0 . 1

0 . 1 5

0 . 2

0 . 3

0 . 4

0 . 6

0 . 8

1

1 . 2

1 . 4

1 . 6

cp, m-1

POC=429.99Cp+27.75Slope SD=6.74R=0.884, n=883

0

100

200

300

400

500

0 0.2 0.4 0.6 0.8 1Cp, 1/m

PO

C, µ

g C

/LAPFZ - AESOPS

EqPac, TT012

Model II regression

Regional ocean-wide regressions

POC = 309.71*Cp + 0.46Slope SD = 3.77R = 0.941, n = 773

0

100

200

300

400

500

0 0.2 0.4 0.6 0.8 1Cp, 1/m

PO

C,m

g C

/L

BATS

NABE

Model II regressionAtlanticPacific

POC = 471.74 * Cp - 4.66Slope SD = 8.48R=0.875, n=726

0

50

100

150

200

250

0 0.1 0.2 0.3 0.4 0.5Cp, 1/m

PO

C, m

g C

/L

Arabian Sea - JGOFS

Model II regressionIndian

cp, m-1

POC, g m-3

Global POC in OAD

Summer

Winter

-180° -160° -140° -120° -100° -80° -60° -40° -20° 0° 20° 40° 60° 80° 100° 120° 140° 160° 180°-80°

-60°

-40°

-20°

0°

20°

40°

60°

80°

-180° -160° -140° -120° -100° -80° -60° -40° -20° 0° 20° 40° 60° 80° 100° 120° 140° 160° 180°-80°

-60°

-40°

-20°

0°

20°

40°

60°

80°

0

50

75

100

150

200

300

400

500

600

700

800

POC, g m-3

Global integrated POC in OAD

Summer

Winter

-180° -160° -140° -120° -100° -80° -60° -40° -20° 0° 20° 40° 60° 80° 100° 120° 140° 160° 180°-80°

-60°

-40°

-20°

0°

20°

40°

60°

80°

-180° -160° -140° -120° -100° -80° -60° -40° -20° 0° 20° 40° 60° 80° 100° 120° 140° 160° 180°-80°

-60°

-40°

-20°

0°

20°

40°

60°

80°

0.8

1

1.5

2

3

4

5

6

7

POC, g m-2

Histograms

% of area covered by different concentration ranges

% of total global POC mass accounted for in areas with different concentration ranges

0

10

20

30

40

50

60

1 2 3 4 5 6 7POC concentration, g m-2

% o

f a

rea

Area Summer %

Area Winter %

0

10

20

30

40

50

60

1 2 3 4 5 6 7POC concentration, g m-2

% o

f to

tal

PO

C m

ass

POC Summer %

POC Winter %

Global total POC massin OAD layer:

Winter - 0.63 Gt C

Summer - 0.64 Gt C