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 transcript:

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 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

Plant Biomass Distribution

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

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

Data sources Modeled rates – Walsh et al – 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 Low Medium High

Water column primary production g C m -2 yr g C yr -1 Central Gulf 190* (63%)Walsh et al Lohrenz & Verity 2010 TX 156* (5%)Walsh et al Lohrenz & Verity 2010 LA260*45.8(11%)Walsh et al WFS 270* (11%)Walsh et al Lohrenz & Verity 2010 MX 265? (11%) Lohrenz & Verity 2010 Plume 3060* Walsh et al Cai & Lohrenz 2009 Total  = 336 Walsh et al *f = 0.10(global areal mean = 144 g C m -2 yr -1 ) 2010 Ocean Sciences Portland, OR Feb. 26,2010

Primary Productivity g C m -2 yr g C yr -1 Reference Benthic GMx (0-20m)Murrell et al Benthic MAB (0-20m)Jahnke et al Total WC 336 Total PP Ocean Sciences Portland, OR Feb. 26,2010

Export from upper layer g C m -2 yr g C yr -1 Central Gulf (63%)*Walsh et al TX12.4*Walsh et al LA *Walsh et al Redalje et al WFS14.7*Walsh et al Plume ? *Walsh et al Redalje et al mAve = (37%) Total  = 21.7 (6.4% PP) Walsh et al Ocean Sciences Portland, OR Feb. 26,2010

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

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 Robbins, in prep. FL, TX, AL Rivers Robbins, in prep. Total

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

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

Preliminary Findings EPA survey cruises shown strong influence of freshwater inputs

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

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 = Tg C yr -1 flux pCO2 SSS SST

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 = Tg C yr -1 flux pCO2 SSSSST

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

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

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

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

Shelf-wide budget (10 12 g C yr -1 ) DOC in rain CO DIC & TOC 43.5 Land Atmosphere Water column DOC Open Ocean DIC? POC? Prim. Prod. 336 Resp.? Export Prod 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

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