Coral Reefs

, Volume 32, Issue 1, pp 239–254 | Cite as

Spatiotemporal variations in CO2 flux in a fringing reef simulated using a novel carbonate system dynamics model

  • A. Watanabe
  • T. Yamamoto
  • K. Nadaoka
  • Y. Maeda
  • T. Miyajima
  • Y. Tanaka
  • A. C. Blanco
Report

Abstract

A carbonate system dynamics (CSD) model was developed in a fringing reef on the east coast of Ishigaki Island, southwest Japan, by incorporating organic and inorganic carbon fluxes (photosynthesis and calcification), air–sea gas exchanges, and benthic cover of coral and seagrass into a three-dimensional hydrodynamic model. The CSD model could reproduce temporal variations in dissolved inorganic carbon (DIC) and total alkalinity in coral zones, but not in seagrass meadows. The poor reproduction in seagrass meadows can be attributed to significant contributions of submarine groundwater discharge as well as misclassification of remotely sensed megabenthos in this area. In comparison with offshore areas, the reef acted as a CO2 sink during the observation period when it was averaged over 24 h. The CSD model also indicated large spatiotemporal differences in the carbon dioxide (CO2) sink/source, possibly related to hydrodynamic features such as effective offshore seawater exchange and neap/spring tidal variation. This suggests that the data obtained from a single point observation may lead to misinterpretation of the overall trend and thus should be carefully considered. The model analysis also showed that the advective flux of DIC from neighboring grids is several times greater than local biological flux of DIC and is three orders of magnitude greater than the air–sea gas flux at the coral zone. Sensitivity tests in which coral or seagrass covers were altered revealed that the CO2 sink potential was much more sensitive to changes in coral cover than seagrass cover.

Keywords

Carbonate system dynamics model CO2 flux Fringing reef Photosynthesis Calcification 

References

  1. Abe O, Watanabe A, Sarma VVSS, Matsui Y, Yamano H, Yoshida N, Saino T (2010) Air-sea gas transfer in a shallow, flowing and coastal environment estimated by dissolved inorganic carbon and dissolved oxygen analyses. J Oceanogr 66:363–372CrossRefGoogle Scholar
  2. Anthony KRN, Kleypas JA, Gattuso JP (2011) Coral reefs modify their seawater carbon chemistry – implications for impacts of ocean acidification. Global Change Biol doi: 10.1111/j.1365-2486.2011.02510.x
  3. Blanco AC, Watanabe A, Nadaoka K, Motooka S, Herrera EC, Yamamoto T (2011) Estimation of nearshore groundwater discharge and its potential effects on a fringing coral reef. Mar Pollut Bull 62:770–785PubMedCrossRefGoogle Scholar
  4. Blumberg AF, Mellor GL (1987) A description of a three-dimensional coastal ocean circulation model. In: Heaps NS (ed) Three-dimensional coastal ocean models. American Geophysical Union, Washington, DC, pp 1–16Google Scholar
  5. Chalker BE (1981) Simulating light-saturation curves for photosynthesis and calcification by reef-building corals. Mar Biol 63:135–141CrossRefGoogle Scholar
  6. Dickson AG, Millero FJ (1987) A comparison of the equilibrium-constants for the dissociation of carbonic-acid in seawater media. Deep-Sea Res 34:1733–1743CrossRefGoogle Scholar
  7. Hasegawa H (2011) The decline of coral reef conditions caused by the extensive land modification: A case study of the Shiraho Area on Ishigaki Island, Okinawa, Japan. Journal of the Remote Sensing Society of Japan 31:73–86 (in Japanese with English abstract)Google Scholar
  8. Hata H, Kudo S, Yamano H, Kurano N, Kayanne H (2002) Organic carbon flux in Shiraho coral reef (Ishigaki Island, Japan). Mar Ecol Prog Ser 232:129–140CrossRefGoogle Scholar
  9. Hedley JD, Harborne AR, Mumby PJ (2005) Simple and robust removal of sun glint for mapping shallow-water benthos. Int J Remote Sens 26:2107–2112CrossRefGoogle Scholar
  10. Hoegh-Guldberg O, Mumby PJ, Hooten AJ, Steneck RS, Greenfield P, Gomez E, Harvell CD, Sale PF, Edwards AJ, Caldeira K, Knowlton N, Eakin CM, Iglesias-Prieto R, Muthiga N, Bradbury RH, Dubi A, Hatziolos ME (2007) Coral reefs under rapid climate change and ocean acidification. Science 318:1737–1742PubMedCrossRefGoogle Scholar
  11. ISRS (2004) The effects of terrestrial runoff of sediments, nutrients and other pollutants on coral reefs. Briefing Paper 3, International Society for Reef Studies, p 18Google Scholar
  12. Johnson HK (1999) Simple expressions for correcting wind speed data for elevation. Coast Eng 36(3):263–269CrossRefGoogle Scholar
  13. Kawahata H, Yukino I, Suzuki A (2000) Terrestrial influence on the Shiraho fringing reef, Ishigaki Island, Japan: high carbon input relative to phosphate. Coral Reefs 19:172–178CrossRefGoogle Scholar
  14. Kayanne H, Harii S, Ide Y, Akimoto F (2002) Recovery of coral populations after the 1998 bleaching on Shiraho Reef, in the southern Ryukyus, NW Pacific. Mar Ecol Prog Ser 239:93–103CrossRefGoogle Scholar
  15. Kayanne H, Hata H, Kudo S, Yamano H, Watanabe A, Ikeda Y, Nozaki K, Kato K, Negishi A, Saito H (2005) Seasonal and bleaching-induced changes in coral reef metabolism and CO2 flux. Global Biochem Cycles19,GB3015Google Scholar
  16. Kimoto H, Kayanne H, Kudo S, Nozaki K, Negishi A, Kato K (2001) A high time-resolution analyzer for total alkalinity of seawater, based on continuous potentiometric measurement. Anal Sci 17(Supplement):i415–i418Google Scholar
  17. Kimoto H, Nozaki K, Kudo S, Kato K, Negishi A, Kayanne H (2002) Achieving high time-resolution with a new flow-through type analyzer for total inorganic carbon in seawater. Anal Sci 18:247–253PubMedCrossRefGoogle Scholar
  18. Kleypas JA, Buddemeier RW, Archer D, Gattuso JP, Langdon C, Opdyke BN (1999) Geochemical consequences of increased atmospheric carbon dioxide on coral reefs. Science 284:118–120PubMedCrossRefGoogle Scholar
  19. Kleypas JA, Anthony KRN, Gattuso JP (2011) Coral reefs modify their seawater carbon chemistry – case study from a barrier reef (Moorea, French Polynesia). Global Change Biol doi: 10.1111/j.1365-2486.2011.02530.x
  20. Kraines S, Suzuki Y, Yamada K, Komiyama H (1996) Separating biological and physical changes in dissolved oxygen concentration in a coral reef. Limnol Oceanogr 41:1790–1799CrossRefGoogle Scholar
  21. Langdon C, Atkinson MJ (2005) Effect of elevated pCO2 on photosynthesis and calcification of corals and interactions with seasonal change in temperature/irradiance and nutrient enrichment. J Geophys Res 110, C09S07, doi:10.1029/2004JC002576
  22. Lapointe BE (1997) Nutrient thresholds for bottom-up control of macroalgal blooms on coral reefs in Jamaica and southeast Florida. Limnol Oceanogr 42:1131–1191CrossRefGoogle Scholar
  23. Lyzenga DR (1981) Remote sensing of bottom reflectance and water attenuation parameters in shallow water using aircraft and Landsat data. Int J Remote Sens 2:71–82CrossRefGoogle Scholar
  24. Mehrbach C, Culberson CH, Hawley JE, Pytkowicz RM (1973) Measurement of apparent dissociation constants of carbonic-acid in seawater at atmospheric pressure. Limnol Oceanogr 18:897–907CrossRefGoogle Scholar
  25. Mishra D, Narumalani S, Rundquist D, Lawson M (2006) Benthic habitat mapping in tropical marine environments Using QuickBird Multispectral Data. Photogramm Eng Remote Sens 72:1037–1048Google Scholar
  26. Mumby PJ, Clark CD, Green EP, Edwards AJ (1998) Benefits of water column correction and contextual editing for mapping coral reefs. Int J Remote Sens 19:203–210CrossRefGoogle Scholar
  27. Nakamori T, Suzuki A, Iryu Y (1992) Water circulation and carbon flux on Shiraho coral reef of the Ryukyu Islands, Japan. Cont Shelf Res 12:951–970CrossRefGoogle Scholar
  28. Nakamura T, Nakamori T (2009) Estimation of photosynthesis and calcification rates at a fringing reef by accounting for diurnal variations and the zonation of coral reef communities on reef flat and slope: a case study for the Shiraho reef, Ishigaki Island, southwest Japan. Coral Reefs 28:229–250CrossRefGoogle Scholar
  29. Palacios SL, Zimmerman RC (2007) Response of eelgrass Zostera marina to CO2 enrichment: possible impacts of climate change and potential for remediation of coastal habitats. Mar Ecol Prog Ser 344:1–13CrossRefGoogle Scholar
  30. Paringit E, Nadaoka K (2003) Synergistic methods in remote sensing data analysis for tropical coastal ecosystems monitoring. Proceedings of the XXth International Society for Photogrammetry and Remote Sensing Congress, on DVDGoogle Scholar
  31. Paringit E, Nadaoka K (2011) Simultaneous estimation of benthic fractional cover and shallow water bathymetry in coral reef areas from high-resolution satellite images. Int J Remote Sens 33:3026–3047. doi:10.1080/01431161.2011.625054 CrossRefGoogle Scholar
  32. Raymond PA, Cole JJ (2001) Gas exchange in rivers and estuaries: Choosing a gas transfer velocity. Estuaries 24:312–317CrossRefGoogle Scholar
  33. Rogers CS (1990) Responses of coral reefs and reef organisms to sedimentation. Mar Ecol Prog Ser 62:185–202CrossRefGoogle Scholar
  34. Saito H, Tamura N, Kitano H, Mito A, Takahashi C, Suzuki A, Kayanne H (1995) A compact seawater pCO2 measurement system with membrane equilibrator and nondispersive infrared gas analyzer. Deep Sea Res Part I 42:2025–2033CrossRefGoogle Scholar
  35. Saito H, Kimoto H, Nozaki K, Kato K, Negishi A, Kayanne H (1999) Comparative experiment of pCO2 measuring instruments in coral reef environments. 2nd International Symposium on CO2 in the Ocean, Natl Inst for Environ Stud, Tsukuba, JapanGoogle Scholar
  36. Smith SV (1973) Carbon-dioxide dynamics- Record of organic carbon production, respiration and calcification in Eniwetok reef flat community. Limnol Oceanogr 18:106–120CrossRefGoogle Scholar
  37. Smith SV, Kinsey DW (1976) Calcium-carbonate production, coral-reef growth, and sea-level change. Science 194:937–939PubMedCrossRefGoogle Scholar
  38. Suzuki A, Kawahata H (2003) Carbon budget of coral reef systems: an overview of observations in fringing reefs, barrier reefs and atolls in the Indo-Pacific regions. Tellus 55B:428–444Google Scholar
  39. Tamura H, Nadaoka K (2005) Numerical simulation of current and thermal transport in a fringing-type coral reef. Proc 3rd Int Conf on Asian and Pacific Coasts: 659–662Google Scholar
  40. Tamura H, Nadaoka K, Paringit EC (2007) Hydrodynamic characteristics of a fringing coral reef on the east coast of Ishigaki Island, southwest Japan. Coral Reefs 26:17–34CrossRefGoogle Scholar
  41. Tanaka Y, Miyajima T, Koike I, Hayashibara T, Ogawa H (2007) Imbalanced coral growth between organic tissue and carbonate skeleton caused by nutrient enrichment. Limnol Oceanogr 52:1139–1146CrossRefGoogle Scholar
  42. Tanaka Y, Ogawa H, Miyajima T (2011) Bacterial decomposition of coral mucus as evaluated by long-term and quantitative observation. Coral Reefs 30:443–449CrossRefGoogle Scholar
  43. Tokoro T, Kayanne H, Watanabe A, Nadaoka K, Tamura H, Nozaki K, Kato K, Negishi A (2008) High gas-transfer velocity in coastal regions with high energy-dissipation rates. J Geophys Res 113:C11006CrossRefGoogle Scholar
  44. Umezawa Y, Miyajima T, Kayanne H, Koike I (2002) Significance of groundwater nitrogen discharge into coral reefs at Ishigaki Island, southwest of Japan. Coral Reefs 21:346–356Google Scholar
  45. Watanabe A, Kayanne H, Nozaki K, Kato K, Negishi A, Kudo S, Kimoto H, Tsuda M, Dickson AG (2004) A rapid, precise potentiometric determination of total alkalinity in seawater by a newly developed flow-through analyzer designed for coastal regions. Mar Chem 85:75–87CrossRefGoogle Scholar
  46. Weiss RF (1974) Carbon dioxide in water and seawater: The solubility of a nonideal gas. Mar Chem 2:203–215CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • A. Watanabe
    • 1
  • T. Yamamoto
    • 1
  • K. Nadaoka
    • 1
  • Y. Maeda
    • 1
  • T. Miyajima
    • 2
  • Y. Tanaka
    • 1
  • A. C. Blanco
    • 3
  1. 1.Department of Mechanical and Environmental Informatics, Graduate School of Information Science and EngineeringTokyo Institute of TechnologyTokyoJapan
  2. 2.Marine Biogeochemistry Group, Atmosphere and Ocean Research InstituteThe University of TokyoChibaJapan
  3. 3.Department of Geodetic Engineering, College of EngineeringUniversity of the PhilippinesQuezon CityPhilippines

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