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

Global POC Synthesis from Global POC Synthesis from Beam Attenuation DataBeam Attenuation Data

collected during JGOFS, WOCE collected during JGOFS, WOCE and other programsand other programs

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

& M.J. Richardson& M.J. Richardson

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

College StationCollege Station

SMP meeting, WH-2000 2

BackgroundBackground

One of the major goals of JGOFS is to develop One of the major goals of JGOFS is to develop

regional and global mass balances for carbon. regional and global mass balances for carbon.

Selected areasSelected areas were studied through shipboard were studied through shipboard

sampling during JGOFS in the last 15 years. sampling during JGOFS in the last 15 years.

To To extend global coverageextend global coverage, the marine carbon , the marine carbon

dioxide survey was integrated with WOCE. dioxide survey was integrated with WOCE.


IntroductionIntroductionTo obtain information about POC distribution it is To obtain information about POC distribution it is

possible to use possible to use in-situin-situ optical instruments - e.g. optical instruments - e.g. transmissometer and convert beam attenuation transmissometer and convert beam attenuation to POC. to POC.

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

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


ObjectivesObjectives Reduce and quality control the transmissometer data Reduce and quality control the transmissometer data

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

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

Explore whether the relationship between COExplore whether the relationship between CO22

drawdown and POC concentration can be used to drawdown and POC concentration can be used to estimate POC export from surface waters.estimate POC export from surface waters.


Data SetData SetTransmissometer data have been collected using Transmissometer data have been collected using

instruments provided by our group over the last instruments provided by our group over the last decade in collaboration with WOCE, JGOFS, and decade in collaboration with WOCE, JGOFS, and other large-scale hydrographic programs. other large-scale hydrographic programs.

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

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


Station Coverage: WOCE, JGOFS & othersStation Coverage: WOCE, JGOFS & others

JGOFS JGOFS WOCEWOCE OthersOthers


Available Transmissometer Available Transmissometer Data:Data:

19 WOCE cruises (Jan.1990 - Jun.1997), 19 WOCE cruises (Jan.1990 - Jun.1997), which includes:which includes: 2231/2239 Sts/Casts;2231/2239 Sts/Casts;

More data will be included from:More data will be included from: JGOFS: 22 cruises, 410/1568 Sts/CastsJGOFS: 22 cruises, 410/1568 Sts/Casts SAVE, WBEX, MCTT, SAVE, WBEX, MCTT, etcetc: 9 cruises, 600 Sts (est.): 9 cruises, 600 Sts (est.)

Possible future additions:Possible future additions: BATS & HOT: TBABATS & HOT: TBA other archives (BOFS, NIOP, etc.): TBAother archives (BOFS, NIOP, etc.): TBA


0

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1983

1984

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1986

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1989

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1991

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1998

JGOFS WOCE Others

Global Transmissometer DataGlobal Transmissometer DataStations per Year DistributionStations per Year Distribution


Global Transmissometer DataGlobal Transmissometer Data

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100

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600

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

OthersWOCEJGOFS

Stations per Month DistributionStations per Month Distribution


WOCE Line Ship name Start FinishA21 Meteor 23-Jan-90 06-Mar-90p17c Th.Washington 02-Jun-91 07-Jul-91

p16s/p17s Th.Washington 31-Aug-91 10-Oct-91s04p Akademik IOFFE 22-Feb-92 29-Mar-92p14c Knorr 01-Sep-92 13-Sep-92

p16a/ p17a Knorr 08-Oct-92 24-Nov-92p17e/ p19s Knorr 14-Dec-92 18-Jan-93

p19c Knorr 23-Feb-93 10-Apr-93p17n Th. Thompson 16-May-93 26-Jun-93p14n Th. Thompson 07-Jul-93 29-Aug-93p18 Discoverer 23-Feb-94 24-Aug-94i09s Knorr 24-Jan-95 05-Mar-95

i05e/ i08n Knorr 10-Mar-95 15-Apr-95i03 Knorr 24-Apr-95 05-Jun-95

i04 / i05w / i07c Knorr 11-Jun-95 11-Jul-95i07n Knorr 15-Jul-95 24-Aug-95i10 Knorr 11-Nov-95 24-Nov-95s04i N. Palmer 03-May-96 02-Jul-96A24 Knorr 30-May-97 28-Jun-97

WOCE Cruises (19)


WOCE Stations

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200a2

1

p17c

p16s

/p17

s

s04p

p14c

p16a

/p17

a

p17e

/p19

s

p19c

p17n

p14n p1

8

i09s

i05e

/i08n i0

3

i04/

i05w

/i07c

i07n i1

0

s04i

a24

Stations, 2231Casts, 2239

WOCE LinesWOCE Lines

Sta

tion

sS

tati

ons


JGOFS Cruise Region Start FinishAtlantis-II-119_5 NABE 15-May-89 08-Jun-89

Endeavor-198 NABE 26-Jun-89 07-Jul-89TT-007 EqPac 03-Feb-92 09-Mar-92TT-008 EqPac 19-Mar-92 14-Apr-92TT-011 EqPac 05-Aug-92 18-Sep-92TT-012 EqPac 24-Sep-92 21-Oct-92

TTN-043 Arabian Sea 08-Jan-95 01-Feb-95TTN-045 Arabian Sea 14-Mar-95 08-Apr-95TTN-049 Arabian Sea 18-Jul-95 13-Aug-95TTN-050 Arabian Sea 18-Aug-95 13-Sep-95TTN-054 Arabian Sea 30-Nov-95 26-Dec-95

NBP 96-4a AESOPS 10-Mar-96 15-Apr-96NBP 96-4 AESOPS 09-Sep-96 19-Sep-96NBP 96-5 AESOPS 08-Oct-96 06-Nov-96NBP 97-1 AESOPS 12-Jan-97 09-Feb-97NBP 97-3 AESOPS 08-Apr-97 05-May-97

Kiwi-6 AESOPS 23-Oct-97 19-Nov-97NBP 97-8 AESOPS 09-Nov-97 12-Dec-97

Kiwi-7 AESOPS 04-Dec-97 30-Dec-97Kiwi-8 AESOPS 10-Jan-98 02-Feb-98Kiwi-9 AESOPS 14-Feb-98 15-Mar-98

NBP 98-2 AESOPS 25-Feb-98 31-Mar-98

JGOFS Cruises (22)


JGOFS Stations

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160A

tlan

tis-

II

End

eavo

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-007

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-011

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TT

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NB

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6-4A

NB

P 9

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NB

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NB

P 9

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NB

P 9

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Kiw

i-6

NB

P 9

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Kiw

i-7

Kiw

i-8

Kiw

i-9

NB

P 9

8-2


JGOFS CruisesJGOFS Cruises

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sS

tati

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Cruise Region Start FinishWBEX Atlantic 24-Apr-83 15-May-86

Oceanus-134 Atlantic 15-Jun-83 11-Jul-83SAVE-1 Atlantic 23-Nov-87 13-Dec-87SAVE-2 Atlantic 18-Dec-87 23-Jan-88SAVE-3 Atlantic 29-Jan-88 07-Mar-88MCTT Atlantic 25-Jul-88 27-Aur-88SAVE-4 Atlantic 09-Dec-88 13-Jan-89SAVE-5 Atlantic 27-Jan-89 06-Mar-89SAVE-6 Atlantic 14-Mar-89 12-Apr-89

Other Cruises (9)


Other Stations

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WBEX OC-134 SAVE-1 SAVE-2 SAVE-3 MCTT SAVE-4 SAVE-5 SAVE-6


Other ProgramsOther Programs

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Data InventoryData Inventory

Sample SectionsSample Sections


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

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Beam AttenuationBeam Attenuation

Distance, nmDep

th, m

NorthNorth


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

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0.38 0.4 0.42 0.44 0.46 0.48 0.5 0.52 0.54 0.56Distance, nm

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Beam AttenuationBeam Attenuation


Future steps 1Future steps 1

Transmissometer database:Transmissometer database: Process 19 WOCE cruises of Process 19 WOCE cruises of

transmissometer data;transmissometer data; Add processed transmissometer & Add processed transmissometer &

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

from other basin-scale cruises where from other basin-scale cruises where we have data (9we have data (9++).).


Future steps 2Future steps 2

Beam attenuation / POC relationship:Beam attenuation / POC relationship: Use algorithms developed during JGOFS: Use algorithms developed during JGOFS:

NABE, Arabian Sea, and Ross NABE, Arabian Sea, and Ross Sea/Antarctic Polar Front Zone Sea/Antarctic Polar Front Zone expeditions;expeditions;

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


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0 40 80 120 160

Ross Sea

NABE

APFZ

Linear (Ross Sea)

Linear (NABE)

Linear (APFZ)

JGOFS: Beam CJGOFS: Beam Cpp versus POC versus POC

POC, POC, M C/LM C/L

CCpp,

m, m-1-1

NABE: y=0.0376x - 0.0032R2=0.913

APFZ: y=0.0264x - 0.0649R2=0.982

RS: y=0.0178x - 0.0155R2=0.874


Thank You!Thank You!

Documents

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