A preliminary carbon budget for the gulf of mexico
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A Preliminary Carbon Budget for the Gulf of Mexico . Paula G Coble, Lisa L Robbins, Kendra L Daly, Wei-Jun Cai, Katja Fennel, Steven E Lohrenz . Fluxes of interest. Interfacial fluxes:. Inputs from land of DOC, POC, and DIC Air-sea: Exchange of CO 2 , rainwater DOC

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A Preliminary Carbon Budget for the Gulf of Mexico

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A preliminary carbon budget for the gulf of mexico

A Preliminary Carbon Budget for the Gulf of Mexico

Paula G Coble, Lisa L Robbins, Kendra L Daly, Wei-Jun Cai, Katja Fennel, Steven E Lohrenz

2010 Ocean Sciences Portland, OR Feb. 26,2010


Fluxes of interest

Fluxes of interest

Interfacial fluxes:

  • Inputs from land of DOC, POC, and DIC

  • Air-sea: Exchange of CO2, rainwater DOC

  • Sedimentary fluxes: POC deposition, DOC & DIC exchange, benthic productivity, groundwater, hydrocarbon seeps

  • Shelf-break exchange: DIC, DOC, POC

Internal fluxes:

  • Primary production

  • Respiration

  • Net community production


Plant biomass distribution

Plant Biomass Distribution


A preliminary carbon budget for the gulf of mexico

  • Semi-enclosed basin with major terrestrial inputs

    • Basin covers 40% US, 40% Mexico


Depth areas

Depth Areas

2010 Ocean Sciences Portland, OR Feb. 26,2010


Data sources

Data sources

  • Modeled rates –

    • Walsh et al. 1989 – water column fluxes

      • 2-layered physical, 21-layered biochemical model

      • 3 coastal areas, open gulf, and plume values calculated

    • Wanninkhof – air-sea flux

  • Measured rates

    • Primary productivity, sediment trap fluxes, sediment community oxygen consumption (Rowe)

  • Fluxes – rates times depth interval areas

2010 Ocean Sciences Portland, OR Feb. 26,2010


Key for describing level of uncertainty

Key for describing level of uncertainty

Low

Medium

High


Water column primary production

Water column primary production

*f = 0.10

(global areal mean = 144 g C m-2 yr-1)

2010 Ocean Sciences Portland, OR Feb. 26,2010


Primary productivity

Primary Productivity

2010 Ocean Sciences Portland, OR Feb. 26,2010


Export from upper layer

Export from upper layer

2010 Ocean Sciences Portland, OR Feb. 26,2010


Sediment water interface 10 12 g c yr 1

Sediment-water interface (1012 g C yr-1)

2010 Ocean Sciences Portland, OR Feb. 26,2010

*50:1 C:chla


Input from land 10 12 g c yr 1

Input from land (1012g C yr-1)

2010 Ocean Sciences Portland, OR Feb. 26,2010


2008 r v gunter cruises

Air-sea flux data

2008 R/V Gunter cruises

2009 USGS cruises

Wanninkhof 2009

Robbins, unpub.

2010 Ocean Sciences Portland, OR Feb. 26,2010


Gulfcarbon a comprehensive study of carbon dynamics in the northern gulf of mexico

GulfCarbon: A Comprehensive Study of Carbon Dynamics in the Northern Gulf of Mexico

Steven E. Lohrenz, Wei-Jun Cai, Kevin Martin, Sumit Chakraborty, Sarah Epps, Kjell Gundersen, Wei-Jen Huang, Yongchen Wang


A preliminary carbon budget for the gulf of mexico

Preliminary Findings

EPA survey cruises shown strong influence of freshwater inputs


Satellite derived pco2

Satellite-derived pCO2

  • Net sink inshore in June

  • Net source offshore source in Sep


Air sea flux

Air-sea flux

  • MR plume sink all year

  • Open water source only in late summer

  • pCO2 correlates with temperature

flux

pCO2

pCO2

flux

North of 24°N =

-11.8 Tg C yr-1

SSS

SST

SSS

SST

2010 Ocean Sciences Portland, OR Feb. 26,2010

Wanninkhof 2009


Air sea flux1

Air-sea flux

  • MR plume sink all year

  • Open water source only in late summer

  • pCO2 correlates with temperature

pCO2

pCO2

flux

flux

North of 24°N =

-11.8 Tg C yr-1

SSS

SST

SSS

SST

2010 Ocean Sciences Portland, OR Feb. 26,2010

Wanninkhof 2009


Air to sea co 2 fluxes

Air-to-sea CO2 fluxes

Red numbers are sinks

2010 Ocean Sciences Portland, OR Feb. 26,2010


A preliminary carbon budget for the gulf of mexico

Other fluxes - Hypoxia

21 – 28 July 2007 Hypoxia

(N. Rabalais, LUMCON)


Other fluxes crude oil

Other fluxes - Crude oil

1000 – 2000

barrels/d =

0.04 – 0.08 Tg C/yr

DWH spill total

2.24-4.48 M

barrels =

024 – 0.49 Tg C

Thanks to C. Hu


A preliminary carbon budget for the gulf of mexico

Other fluxes - Volatile HC seeps

chemotrophic bacterial carbonate pavements

Thanks to V. Asper


Shelf wide budget 10 12 g c yr 1

Shelf-wide budget (1012 g C yr-1)

DOC in rain

Land

Atmosphere

CO2

17.7

DIC & TOC

43.5

Prim. Prod. 336

Groundwater

???

DOC

Resp.?

Export Prod. 21.7

Benthic algae 22

POC

5.92

DIC?

POC?

Water column

Sediments

Open

Ocean

DOC DIC

0.81

DWH oil spill

Thanks to R. Najjar

2010 Ocean Sciences Portland, OR Feb. 26,2010


Conclusions

Conclusions

  • Many rates missing

    • Some not available, some still under construction

  • Need data from southern GMx

    • Unknown availability

  • Need DIC and DOC internal flux data

    • Potentially can be modeled from existing concentration data

  • Need data for fluxes GMx – Caribbean

    • Potentially can be modeled from existing concentration data

2010 Ocean Sciences Portland, OR Feb. 26,2010


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