Global poc synthesis from beam attenuation data collected during jgofs woce and other programs
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Global POC Synthesis from Beam Attenuation Data collected during JGOFS, WOCE and other programs. A.V. Mishonov, W.D. Gardner, & M.J. Richardson Department of Oceanography Texas A & M University College Station. Background.

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Global POC Synthesis from Beam Attenuation Data collected during JGOFS, WOCE and other programs

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Global poc synthesis from beam attenuation data collected during jgofs woce and other programs

Global POC Synthesis from Beam Attenuation Datacollected during JGOFS, WOCE and other programs

A.V. Mishonov, W.D. Gardner,

& M.J. Richardson

Department of Oceanography

Texas A & M University

College Station


Background

Background

One of the major goals of JGOFS is to develop regional and global mass balances for carbon.

Selected areas were studied through shipboard sampling during JGOFS in the last 15 years.

To extend global coverage, the marine carbon dioxide survey was integrated with WOCE.

SMP meeting, WH-2000


Introduction

Introduction

To obtain information about POC distribution it is possible to use in-situ optical instruments - e.g. transmissometer and convert beam attenuation to POC.

In order to extend our data coverage to a global level, we convinced many WOCE scientists to interface our transmissometers on their WOCE cruises during the last decade.

We now have an opportunity to reduce & synthesize the data collected.

SMP meeting, WH-2000


Objectives

Objectives

  • Reduce and quality control the transmissometer data from 17 WOCE cruises, providing accessibility and compatibility with JGOFS data for input to models of carbon cycling, aggregation / disaggregation, etc.

  • Establish new ocean- or region-specific algorithms to estimate global POC standing stock in the surface ocean from satellite back-scatter data and our transmissometer data sets.

  • Explore whether the relationship between CO2 drawdown and POC concentration can be used to estimate POC export from surface waters.

SMP meeting, WH-2000


Data set

Data Set

Transmissometer data have been collected using instruments provided by our group over the last decade in collaboration with WOCE, JGOFS, and other large-scale hydrographic programs.

These data include basin-wide transects in the North and South Atlantic, North and South Pacific, Indian, and Southern Oceans.

We have been funded to analyze these data and convert the beam attenuation values to POC using the Beam Attenuation:POC relationships derived by our group during JGOFS Process studies.

SMP meeting, WH-2000


Station coverage woce jgofs others

JGOFS

WOCE

Others

Station Coverage: WOCE, JGOFS & others

SMP meeting, WH-2000


Available transmissometer data

Available Transmissometer Data:

  • 19 WOCE cruises (Jan.1990 - Jun.1997), which includes:

    • 2231/2239 Sts/Casts;

  • More data will be included from:

    • JGOFS: 22 cruises, 410/1568 Sts/Casts

    • SAVE, WBEX, MCTT, etc: 9 cruises, 600 Sts (est.)

  • Possible future additions:

    • BATS & HOT: TBA

    • other archives (BOFS, NIOP, etc.): TBA

SMP meeting, WH-2000


Global transmissometer data

Global Transmissometer Data

Stations per Year Distribution

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Global transmissometer data1

Global Transmissometer Data

Stations per Month Distribution

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Woce cruises 19

WOCE Cruises (19)

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Woce stations

WOCE Stations

Stations

WOCE Lines

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Jgofs cruises 22

JGOFS Cruises (22)

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Jgofs stations

JGOFS Stations

Stations

JGOFS Cruises

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Other cruises 9

Other Cruises (9)

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Other stations

Other Stations

Stations

Other Programs

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Data inventory

Data Inventory

Sample Sections

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Pacific ocean section rv th thompson jul aug 93 line p14n

Pacific Ocean SectionRV Th.Thompson, Jul-Aug. 93, Line p14n

North

Beam Attenuation

Depth, m

Distance, nm

SMP meeting, WH-2000


Indian ocean section rv knorr feb 95 line i09s

0

-1000

-2000

-3000

Depth, m

-4000

Beam Attenuation

-5000

Distance, nm

-6000

0.38

0.4

0.42

0.44

0.46

0.48

0.5

0.52

0.54

0.56

0

500

1000

1500

2000

2500

3000

Indian Ocean Section RV Knorr, Feb. 95, Line i09s

SMP meeting, WH-2000


Future steps 1

Future steps 1

Transmissometer database:

  • Process 19 WOCE cruises of transmissometer data;

  • Add processed transmissometer & POC data from 22 JGOFS cruises;

  • Add processed transmissometer data from other basin-scale cruises where we have data (9+).

SMP meeting, WH-2000


Future steps 2

Future steps 2

Beam attenuation / POC relationship:

  • Use algorithms developed during JGOFS: NABE, Arabian Sea, and Ross Sea/Antarctic Polar Front Zone expeditions;

  • convert Beam Attenuation to POC & quantify spatial and temporal distribution.

SMP meeting, WH-2000


Jgofs beam c p versus poc

Cp, m-1

RS: y=0.0178x - 0.0155R2=0.874

NABE: y=0.0376x - 0.0032R2=0.913

APFZ: y=0.0264x - 0.0649R2=0.982

POC, mM C/L

JGOFS: Beam Cp versus POC

SMP meeting, WH-2000


Thank you

Thank You!

SMP meeting, WH-2000


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