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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.

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Presentation on theme: "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."— Presentation transcript:

1 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

2 Fluxes of interest Interfacial fluxes: Inputs from land of DOC, POC, and DIC Air-sea: Exchange of CO 2, 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

3 Plant Biomass Distribution

4 Semi-enclosed basin with major terrestrial inputs Basin covers 40% US, 40% Mexico

5 Depth Areas 2010 Ocean Sciences Portland, OR Feb. 26,2010

6 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

7 Key for describing level of uncertainty Low Medium High

8 Water column primary production g C m -2 yr -1 10 12 g C yr -1 Central Gulf 190* 30-150 191.5 (63%)Walsh et al. 1989 Lohrenz & Verity 2010 TX 156* 160 13.2 (5%)Walsh et al. 1989 Lohrenz & Verity 2010 LA260*45.8(11%)Walsh et al. 1989 WFS 270* 30-180 47.5 (11%)Walsh et al. 1989 Lohrenz & Verity 2010 MX 265? 100-120 46.6(11%) Lohrenz & Verity 2010 Plume 3060* 5845.7 Walsh et al. 1989 Cai & Lohrenz 2009 Total105 - 210  = 336 Walsh et al. 1989 *f = 0.10(global areal mean = 144 g C m -2 yr -1 ) 2010 Ocean Sciences Portland, OR Feb. 26,2010

9 Primary Productivity g C m -2 yr -1 10 12 g C yr -1 Reference Benthic GMx 109.519 (0-20m)Murrell et al. 2009 Benthic MAB 14625.7 (0-20m)Jahnke et al. 2000 Total WC 336 Total PP358 2010 Ocean Sciences Portland, OR Feb. 26,2010

10 Export from upper layer g C m -2 yr -1 10 12 g C yr -1 Central Gulf 12.712.8 (63%)*Walsh et al. 1989 TX12.4*Walsh et al. 1989 LA 18.1 109.5 *Walsh et al. 1989 Redalje et al. 1994 WFS14.7*Walsh et al. 1989 Plume 56.7 365 ? *Walsh et al. 1989 Redalje et al. 1994 0- 200mAve = 15.18.9 (37%) Total  = 21.7 (6.4% PP) Walsh et al. 1989 2010 Ocean Sciences Portland, OR Feb. 26,2010

11 Sediment-water interface ( 10 12 g C yr -1 ) g C m -2 yr -1 10 12 g C yr -1 Central Gulf 1.3* 0.5 1.4 0.83 (52%) *Walsh et al. 1989 Escobar-Briones Rowe et al. 2008 TX7.1**Walsh et al. 1989 LA 9.5* 30 12.7 *Walsh et al. 1989 Eadie et al. 1994 Rowe et al. 2008 WFS7.9**Walsh et al. 1989 Plume 36.2* 50 1 ? *Walsh et al. 1989 Eadie et al. 1994 Cai & Lohrenz 2009 MX Slope/rise 1 - 20.26 (11%)Escobar-Briones 0- 200mAve = 8.2*4.83 (37%) *Walsh et al. 1989 Total 2.06  = 5.92 Walsh et al. 1989 1.7% PP 2010 Ocean Sciences Portland, OR Feb. 26,2010 *50:1 C:chla

12 Input from land (10 12 g C yr -1 ) 2010 Ocean Sciences Portland, OR Feb. 26,2010 DICDOCPOCReference MARS212.5 Cai & Lohrenz 2009 LA Rivers only 0.068.908.89Robbins, in prep. FL, TX, AL Rivers 0.862.651.11Robbins, in prep. Total21.8611.5510

13 2008 R/V Gunter cruises 2010 Ocean Sciences Portland, OR Feb. 26,2010 Wanninkhof 2009 Robbins, unpub. Air-sea flux data 2009 USGS cruises

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

15 Preliminary Findings EPA survey cruises shown strong influence of freshwater inputs

16 Satellite-derived pCO2 Net sink inshore in June Net source offshore source in Sep

17 flux pCO2 SSSSST Air-sea flux 2010 Ocean Sciences Portland, OR Feb. 26,2010 Wanninkhof 2009 MR plume sink all year Open water source only in late summer pCO2 correlates with temperature North of 24°N = -11.8 Tg C yr -1 flux pCO2 SSS SST

18 flux pCO2 SSSSST Air-sea flux 2010 Ocean Sciences Portland, OR Feb. 26,2010 Wanninkhof 2009 MR plume sink all year Open water source only in late summer pCO2 correlates with temperature North of 24°N = -11.8 Tg C yr -1 flux pCO2 SSSSST

19 Air-to-sea CO 2 fluxes 10 12 g C yr -1 mol m -2 yr -1 Reference Summer 0.48 0.186-0.230(Aug.’04) 2.71-3.32 (Oct. ‘05) Robbins, unpub. Lohrenz et al. 2010 Winter -0.22 -0.97 - -1.18 Robbins, unpub. Lohrenz et al. 2010 N of 24º -11.8Wanninkhof (unpub.) Total?-17.7 Red numbers are sinks 2010 Ocean Sciences Portland, OR Feb. 26,2010

20 21 – 28 July 2007 Hypoxia (N. Rabalais, LUMCON) Other fluxes - Hypoxia

21 Other fluxes - Crude oil 1000 – 2000 barrels/d = 0.04 – 0.08 Tg C/yr Thanks to C. Hu DWH spill total 2.24-4.48 M barrels = 024 – 0.49 Tg C

22 Other fluxes - Volatile HC seeps chemotrophic bacterial carbonate pavements Thanks to V. Asper

23 Shelf-wide budget (10 12 g C yr -1 ) DOC in rain CO 2 17.7 DIC & TOC 43.5 Land Atmosphere Water column DOC Open Ocean DIC? POC? Prim. Prod. 336 Resp.? Export Prod. 21.7 Sediments DOC DIC 2010 Ocean Sciences Portland, OR Feb. 26,2010 Benthic algae 22 POC 5.92 Groundwater ??? Thanks to R. Najjar DWH oil spill 0.81

24 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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