Global POC assessment Global POC assessment based based

on transmissometer dataon transmissometer data

Global POC assessment Global POC assessment based based

on transmissometer dataon transmissometer data

Alexey Mishonov Alexey Mishonov Wilford Gardner Wilford Gardner Mary Jo Mary Jo RichardsonRichardson

Alexey Mishonov Alexey Mishonov Wilford Gardner Wilford Gardner Mary Jo Mary Jo RichardsonRichardson

Texas A&M University Texas A&M University Department of OceanographyDepartment of Oceanography

Texas A&M University Texas A&M University Department of OceanographyDepartment of Oceanography

SMP meeting, Woods Hole, July 2001

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Global Transmissometer & Global Transmissometer & POC Data CoveragePOC Data Coverage

POCWOCEJGOFSOther

SMP meeting, Woods Hole, July 2001

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Global Transmissometer Global Transmissometer database on the web: database on the web: http://www-ocean.tamu.edu/~pdgroup/DataDir/SMP-data.html

SMP meeting, Woods Hole, July 2001

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Beam C - POC relationship: Data Beam C - POC relationship: Data UsedUsed

Atlantic OceanAtlantic OceanAtlantic OceanAtlantic Ocean

• North Atlantic Bloom Experiment (NABE) DataNorth Atlantic Bloom Experiment (NABE) Data• Sampling Period: Apr-May 1989Sampling Period: Apr-May 1989• 21 stations/casts 21 stations/casts •Sampling depth: from 2 to 3200 mSampling depth: from 2 to 3200 m• 165 data pairs165 data pairs

• Bermuda Atlantic Time Series (BATS) DataBermuda Atlantic Time Series (BATS) Data• sampling period: 1990-1997sampling period: 1990-1997• 62 cruises/stations/casts62 cruises/stations/casts• Sampling depth: from 0.6 to 1000 mSampling depth: from 0.6 to 1000 m• 608 data pairs 608 data pairs

SMP meeting, Woods Hole, July 2001

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y = 278.91x

R2 = 0.3862

0

20

40

60

80

100

0 0.05 0.1 0.15 0.2 0.25

y = 275.46x

R2 = 0.0827

0

20

40

60

80

100

0 0.05 0.1 0.15 0.2 0.25

y = 289.45x

R2 = 0.2761

0

20

40

60

80

100

0 0.05 0.1 0.15 0.2 0.25

y = 309.45x

R2 = 0.7393

0

20

40

60

80

100

0 0.05 0.1 0.15 0.2 0.25

Atlantic OceanAtlantic OceanAtlantic OceanAtlantic Ocean

Winter Summer

Autumn Spring

BATS: Beam CBATS: Beam Cpp - POC - POC relationshiprelationship

Beam CBeam Cpp, m, m-1-1Beam CBeam Cpp, m, m-1-1Beam CBeam Cpp, m, m-1-1Beam CBeam Cpp, m, m-1-1

PO

C,

mg

mPO

C,

mg

m-3-3

PO

C,

mg

mPO

C,

mg

m-3-3

PO

C,

mg

mPO

C,

mg

m-3-3

PO

C,

mg

mPO

C,

mg

m-3-3

SMP meeting, Woods Hole, July 2001

6Atlantic OceanAtlantic OceanAtlantic OceanAtlantic Ocean

773 data pairs

0

50

100

150

200

250

300

0 0.2 0.4 0.6 0.8 1Beam Cp, m-1

PO

C, m

g m

-3

BATS NABE Regression

POC=BeamCp*311.5547+0.299

R=0.941

NABE & BATS: NABE & BATS: Beam CBeam Cpp - POC relationship - POC relationship

SMP meeting, Woods Hole, July 2001

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Beam CBeam Cpp - POC relationship: Data - POC relationship: Data UsedUsed

Pacific OceanPacific OceanPacific OceanPacific Ocean

Hawaii Ocean Time-series: Hawaii Ocean Time-series: 1991- 1991-19951995• 37 cruises / stations / casts37 cruises / stations / casts• 487 data pairs487 data pairs• Depth: 2.5 - 1050mDepth: 2.5 - 1050mHawaii Time Series data:

POC vs Beam Cp (n=476)

0

10

20

30

40

50

60

70

80

90

100

0 0.2 0.4 0.6 0.8 1Beam Cp, m-1

PO

C,

mg

m-3

0-100m 100-300m >300m

200

400

600

800

1000

1200

0

SMP meeting, Woods Hole, July 2001

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Beam CBeam Cpp - POC relationship: HOT - POC relationship: HOT

Pacific OceanPacific OceanPacific OceanPacific Ocean

0

200

400

600

Beam Cp vs POC

y = 545.64x + 5.667

R2 = 0.5618

y = 7.0624e34.087x

R2 = 0.7352

0

10

20

30

40

50

60

70

80

90

100

0 0.02 0.04 0.06 0.08 0.1Beam Cp, m-1

PO

C,

mg

m-3

SMP meeting, Woods Hole, July 2001

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S.A.V.E.: POC spatial distributionS.A.V.E.: POC spatial distribution

-70° -60° -50° -40° -30° -20° -10° 0° 10° 20°

-60°

-50°

-40°

-30°

-20°

-10°

0°

10°

SAVE-1SAVE-2SAVE-3SAVE-4SAVE-5SAVE-6

0

20

40

60

80

100

120

140

160

180

200

220

240

260

280

300

320

340

Calculated PO C averaged for upper layer (2-30m )SAVE1 - SAVE6 com bined data sets

Atlantic OceanAtlantic OceanAtlantic OceanAtlantic Ocean

SMP meeting, Woods Hole, July 2001

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Beam C & CZCS chl: S.A.V.E. dataBeam C & CZCS chl: S.A.V.E. data

Atlantic OceanAtlantic OceanAtlantic OceanAtlantic Ocean

CZCS CZCS Data Data fromfrom

SMP meeting, Woods Hole, July 2001

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35°N

40°N

-75°W -70°W -65°W

35°N

40°N

23.4 23.8 24.2 24.6 25 25.4 25.8 26.2

2 4 6 8 10 12 14 16 18 20 22 24 26

Density

SalinityTemperature

32 32.6 33.2 33.8 34.4 35 35.6 36.2

-75°W -70°W -65°W

0 20 40 60 80 100 120 140 160

POC, mg/m3

calculated

WBEX-1: POC spatial distributionWBEX-1: POC spatial distributionApril-May, 1986: mixed layer average (upper 30 m)

Atlantic OceanAtlantic OceanAtlantic OceanAtlantic Ocean

SMP meeting, Woods Hole, July 2001

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-70°W -65°W -60°W -55°W

35°N

40°N

45°N

2 4 6 8 10 12 14 16 18 20 22 24 26 32 32.8 33.6 34.4 35.2 36 36.4

35°N

40°N

45°N

23.4 23.8 24.2 24.6 25 25.4 25.8 26.2

Density

SalinityTemperature

-70°W -65°W -60°W -55°W

0 10 20 30 40 50 60 70 80 90100 120 140

POC, mg m-3

calculated

Oceanus-134: POC spatial Oceanus-134: POC spatial distributiondistribution

June-July 1983: mixed layer average (upper 30 m)

Atlantic OceanAtlantic OceanAtlantic OceanAtlantic Ocean

SMP meeting, Woods Hole, July 2001

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Global Transmissometer & Global Transmissometer & POC Data CoveragePOC Data Coverage

POCWOCEJGOFSOther

SMP meeting, Woods Hole, July 2001

Beam c & POC coverage + some Beam c & POC coverage + some FSU Beam c & POS data for FSU Beam c & POS data for

AtlanticAtlantic

NABE BATS HOT

WOCE

JGOFS

Other

FSU

FSU

Beam C

POC

SMP meeting, Woods Hole, July 2001

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Thank YouThank You