Home > Explore Data & Reports > Responses of carbonate system CO2 flux to extended flooding in a semiarid subtropical estuary

Citation:

Yao, H., and X. Hu. 2017. Responses of carbonate system CO2 flux to extended flooding in a semiarid subtropical estuary. Limnology and Oceanography, 62:S112-S130. doi:10.1002/lno.10646

Data/Report Type:

Sponsored Research

Description

Globally, estuaries are considered important CO2 sources to the atmosphere. However, estuarine water carbonate chemistry and CO2 flux studies have focused on temperate and high latitude regions, leaving a significant data gap in subtropical estuaries. In this study, we examined water column carbonate system and air–water CO2 flux in the Mission-Aransas Estuary, a subtropical semiarid estuary in the northwestern Gulf of Mexico, by collecting samples at five System Wide Monitoring Program stations from 05/2014 to 04/2015. The carbonate system parameters (total alkalinity [TA], dissolved inorganic carbon [DIC], pH, CO2 partial pressure [pCO2], and carbonate saturation state with respect to aragonite [XAr]) and air–water CO2 flux all displayed substantial seasonal and spatial variations. Based on freshwater inflow conditions, a drought period occurred between 05/2014 and 02/2015, while a flooding period occurred from 03/2015 to 04/2015. Average DIC was 2194.7 6 156.8 lmol kg21 and 2132.5 6 256.8 lmol kg21 , TA was 2497.6 6 172.1 lmolkg21 and 2333.4 6 283.1 lmol kg21 , pCO2 was 477 6 94 latm and 529 6 251 latm, and CO2 flux was 28.3 6 18.0 mmol Cm22 d21 and 51.6 6 83.9 mmolCm22 d21 in the drought and flooding period, respectively. Integrated annual air–water CO2 flux during our studied period was estimated to be 12.4 6 3.3 molCm22 yr21, indicating that this estuary was a net CO2 source. High wind speed, warm climate, riverine input, and estuarine biogeochemical processes all contributed to the high CO2 efflux despite the modest pCO2 levels year round.

Note to readers with disabilities: Some scientific publications linked from this website may not conform to Section 508 accessibility standards due to the complexity of the information being presented. If you need assistance accessing this electronic content, please contact the lead/corresponding author, Primary Contact, or nccos.webcontent@noaa.gov.

Explore Similar Data/Reports
NCCOS-with-tag-to-side-bld

NCCOS delivers ecosystem science solutions for stewardship of the nation’s ocean and coastal resources, in direct support of NOS priorities, offices, and customers, and to sustain thriving coastal communities and economies.

National Centers for Coastal Ocean Science
1305 East West Highway, Rm 8110
Silver Spring, MD 20910
Phone: (240) 533-0300 / Fax: (301) 713-4353
Email: nccos.webcontent@noaa.gov

    Sign Up for Our Quarterly Newsletter