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Journal of Oceanography

, Volume 66, Issue 1, pp 71–83 | Cite as

East-west distribution of POC fluxes estimated from 234Th in the northern North Pacific in autumn

  • Hajime Kawakami
  • Makio C. Honda
  • Kazuhiko Matsumoto
  • Tetsuichi Fujiki
  • Shuichi Watanabe
Original Articles

Abstract

Observations of primary productivity, 234Th, and particulate organic carbon (POC) were made from west to east across the northern North Pacific Ocean (from station K2 to Ocean Station Papa) during September–October 2005. Primary productivities in this region varied longitudinally from approximately 236 to 444 mgC m−2d−1 and clearly indicate the West High East Low (WHEL) trend. We estimated east-west variations in the POC flux from the surface layer (0–100 m) by using 234Th as a tracer. POC fluxes in the western region (44–53 mgC m−2d−1) were higher than those in the eastern region (21–34 mgC m−2d−1). However, the export ratios (e-ratios) ranged from approximately 8% to 16% and did not show the WHEL trend. Contrary to our expectation, no relation between POC flux (or e-ratio) and diatom biomass (or dominance) was apparent in autumn in the northern North Pacific.

Keywords

Biological pump east-west northern North Pacific 234Th POC flux 

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References

  1. Amiel, D., J. K. Cochran and D. J. Hirschberg (2002): 234Th/238U disequilibrium as an indicator of the seasonal export of particulate organic carbon in the North Water. Deep-Sea Res. II, 49, 5191–5209.CrossRefGoogle Scholar
  2. Anderson, R. F. and A. P. Fleer (1982): Determination of natural actinides and plutonium in marine particulate material. Anal. Chem., 54, 1142–1147.CrossRefGoogle Scholar
  3. Armstrong, R. A., C. Lee, J. I. Hedges, S. Honjo and S. G. Wakeham (2002): A new, mechanistic model for organic carbon fluxes on the ocean based on the quantitative association of POC with ballast minerals. Deep-Sea Res. II, 49, 219–236.CrossRefGoogle Scholar
  4. Auad, G. (2003): Interdecadal dynamics of the North Pacific Ocean. J. Phys. Oceanogr., 33, 2483–2503.CrossRefGoogle Scholar
  5. Bacon, M. P., J. K. Cochran, D. Hirschberg, T. R. Hammar and A. P. Fleer (1996): Export flux of carbon at the equator during the EqPac time-series cruises estimated from 234Th measurements. Deep-Sea Res. II, 43, 1133–1154.CrossRefGoogle Scholar
  6. Benitez-Nelson, C., K. O. Buesseler, D. M. Karl and J. Andrews (2001): A time-series study of particulate matter export in the North Pacific Subtropical Gyre based on 234Th: 238U disequilibrium. Deep-Sea Res. I, 48, 2595–2611.CrossRefGoogle Scholar
  7. Benitez-Nelson, C. R., R. R. Bidigare, T. D. Dickey, M. R. Landry, C. L. Leonard, S. L. Brown, F. Nencioli, Y. M. Rii, K. Maiti, J. W. Becker, T. S. Bibby, W. Black, W.-J. Cai, C. A. Carlson, F. Chen, V. S. Kuwahara, C. Mahaffey, P. M. McAndrew, P. D. Quay, M. S. Rappé, K. E. Selph, M. P. Simmons and E. J. Yang (2007): Mesoscale eddies drive increased silica export in the subtropical Pacific Ocean. Science, 316, 1017–1021.CrossRefGoogle Scholar
  8. Boyd, P. and P. J. Harrison (1999): Phytoplankton dynamics in the NE subarctic Pacific. Deep-Sea Res. II, 46, 2405–2432.CrossRefGoogle Scholar
  9. Buesseler, K. O. (1998): The decoupling of production and particulate export in the surface ocean. Global Biogeochem. Cycles, 12, 297–310.CrossRefGoogle Scholar
  10. Buesseler, K. O., M. P. Bacon, J. K. Cochran and H. D. Livingston (1992): Carbon and nitrogen export during the JGOFS North Atlantic Bloom Experiment estimated from 234Th:238U disequilibria. Deep-Sea Res. I, 39, 1115–1137.CrossRefGoogle Scholar
  11. Buesseler, K. O., J. A. Andrews, M. C. Hartman, R. Belastock and F. Chai (1995): Regional estimates of the export flux of particulate organic carbon derived from thorium-234 during the JGOFS EqPac program. Deep-Sea Res. II, 42, 777–804.CrossRefGoogle Scholar
  12. Buesseler, K. O., L. Ball, J. Andrews, J. K. Cochran, D. J. Hirschberg, M. P. Bacon, A. Fleer and M. Brzezinski (2001a): Upper ocean export of particulate organic carbon and biogenic silica in the Southern Ocean along 170°W. Deep-Sea Res. II, 48, 4275–4297.CrossRefGoogle Scholar
  13. Buesseler, K. O., C. Benitez-Nelson, M. Rutgers van der Loeff, J. Andrews, L. Ball, G. Crossin and M. A. Charette (2001b): An intercomparison of small- and large-volume techniques for thorium-234 in seawater. Mar. Chem., 74, 15–28.CrossRefGoogle Scholar
  14. Buesseler, K. O., C. Benitez-Nelson, S. B. Moran, A. Burd, M. A. Charette, J. K. Cochran, L. Coppola, N. S. Fisher, S. W. Fowler, W. D. Gardner, L. D. Guo, O. Gustafsson, C. Lamborg, P. Masque, J. C. Miquel, U. Passow, P. H. Santschi, N. Savoye, G. Stewart and T. Trull (2006): An assessment of particulate organic carbon to thorium-234 ratios in the ocean and their impact on the application of 234Th as a POC flux proxy. Mar. Chem., 100, 213–233.CrossRefGoogle Scholar
  15. Charette, M. A., S. B. Moran and J. K. B. Bishop (1999): 234Th as a tracer of particulate organic carbon export in the subarctic northeast Pacific Ocean. Deep-Sea Res. II, 46, 2833–2861.CrossRefGoogle Scholar
  16. Chen, J. H., R. L. Edwards and G. J. Wasserburg (1986): 238U, 234U and 232Th in seawater. Earth Planet. Sci. Lett., 80, 241–251.CrossRefGoogle Scholar
  17. Coale, K. H. and K. W. Bruland (1985): 234Th:238U disequilibria: within the California Current. Limnol. Oceanogr., 30, 22–33.CrossRefGoogle Scholar
  18. Ebersbach, F. and T. W. Trull (2008): Sinking particles properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean. Limnol. Oceanogr., 53, 212–224.Google Scholar
  19. Fujiki, T., K. Matsumoto, M. C. Honda, H. Kawakami and S. Watanabe (2009): Phytoplankton composition in the subarctic North Pacific during autumn 2005. J. Plankton Res., 31, 179–191.CrossRefGoogle Scholar
  20. Hama, T., T. Miyazaki, Y. Ogawa, T. Iwakuma, M. Takahashi, A. Otsuki and S. Ishimura (1983): Measurement of photosynthetic production of a marine phytoplankton population using a stable 13C isotope. Mar. Biol., 73, 31–36.CrossRefGoogle Scholar
  21. Harrison, P. J., P. W. Boyd, D. E. Varela, S. Takeda, A. Shiomoto and T. Odate (1999): Comparison of factors controlling phytoplankton productivity in the NE and NW subarctic Pacific gyres. Prog. Oceanogr., 43, 205–234.CrossRefGoogle Scholar
  22. Honda, M. C. (2003): Biological pump in northwestern North Pacific. J. Oceanogr., 59, 671–684.CrossRefGoogle Scholar
  23. Honda, M. C., K. Imai, Y. Nojili, F. Hoshi, T. Sugawara and M. Kusakabe (2002): The biological pump in the northwestern North Pacific based on fluxes and major components of particulate matter obtained by sediment-trap experiment (1997–2000). Deep-Sea Res. II, 49, 5595–5625.CrossRefGoogle Scholar
  24. Imai, K., Y. Nojiri, N. Tsurushima and T. Saino (2002): Time series of seasonal variation of primary productivity at station KNOT (44°N, 155°E) in the sub-arctic western North Pacific. Deep-Sea Res. II, 49, 5395–5408.CrossRefGoogle Scholar
  25. Kawakami, H. and M. C. Honda (2007): Time-series observation of POC fluxes estimated from 234Th in the northwestern North Pacific. Deep-Sea Res. I, 54, 1070–1090.CrossRefGoogle Scholar
  26. Kawakami, H., Y.-L. Yang, M. C. Honda and M. Kusakabe (2004): Particulate organic carbon fluxes estimated from 234Th deficiency in winters and springs in the northwestern North Pacific. Geochem. J., 38, 581–592.Google Scholar
  27. Kawakami, H., M. C. Honda, M. Wakita and S. Watanabe (2007): Time-series observation of dissolved inorganic carbon and nutrients in the northwestern North Pacific. J. Oceanogr., 63, 967–982.CrossRefGoogle Scholar
  28. Kemp, A. E. S., J. Pike, R. B. Pearce and C. B. Lange (2000): The “Fall dump”—a new perspective on the role of a “shade flora” in the annual cycle of diatom production and export flux. Deep-Sea Res. II, 47, 2129–2154.CrossRefGoogle Scholar
  29. Knauer, G. A., J. H. Martin and K. W. Bruland (1979): Fluxes of particulate carbon, nitrogen, and phosphorus in the upper water column of the northeast Pacific. Deep-Sea Res. A, 26, 97–108.CrossRefGoogle Scholar
  30. Mochizuki, M., N. Shiga, M. Saito, K. Imai and Y. Nojiri (2002): Seasonal changes in nutrients, chlorophyll a and the phytoplankton assemblage of the western subarctic gyre in the Pacific Ocean. Deep-Sea Res. II, 49, 5421–5439.CrossRefGoogle Scholar
  31. Narita, H., R. Abe, K. Tate, Y.-I. Kim, K. Harada and S. Tsunogai (2003): Anomalous large scavenging of 230Th and 231Pa controlled by particle composition in the northwestern North Pacific. J. Oceanogr., 59, 739–750.CrossRefGoogle Scholar
  32. Ondrusek, M. E., R. R. Bidigare, S. T. Sweet, D. A. Defreitas and J. M. Brooks (1991): Distribution of phytoplankton pigments in the North Pacific Ocean in relation to physical and optical variability. Deep-Sea Res., 38, 243–266.CrossRefGoogle Scholar
  33. Richardson, T. L. and G. A. Jackson (2007): Small phytoplankton and carbon export form the surface ocean. Science, 315, 838–840.CrossRefGoogle Scholar
  34. Saino, T., A. Bychkov, C.-T. A. Chen and P. J. Harrison (2002): The Joint Global Ocean Flux Study in the North Pacific. Deep-Sea Res. II, 49, 5297–5301.CrossRefGoogle Scholar
  35. Saito, H., A. Tsuda and H. Kasai (2002): Nutrient and plankton dynamics in the Oyashio region of the western subarctic Pacific Ocean. Deep-Sea Res. II, 49, 5463–5486.CrossRefGoogle Scholar
  36. Savoye, N., C. Benitez-Nelson, A. B. Burd, J. K. Cochran, M. Charette, K. O. Buesseler, G. A. Jackson, M. Roy-Barman, S. Schmidt and M. Elskens (2006): 234Th sorption and export models in the water column: A review. Mar. Chem., 100, 234–249.CrossRefGoogle Scholar
  37. Savoye, N., T. W. Trull, S. H. M. Jacquet, J. Navez and F. Dehairs (2008): 234Th-based export fluxes during a natural iron fertilization experiment in the Southern Ocean (KEOPS). Deep-Sea Res. II, 55, 841–855.CrossRefGoogle Scholar
  38. Schmidt, S., V. Andersen, S. Belviso and J. C. Marty (2002): Strong seasonality in particle dynamics of north-western Mediterranean surface waters as revealed by 234Th/238U. Deep-Sea Res. I, 49, 1507–1518.CrossRefGoogle Scholar
  39. Smetacek, V. S. (2000): The giant diatom dump. Nature, 406, 574–575.CrossRefGoogle Scholar
  40. Tsunogai, S. and S. Noriki (1991): Particulate fluxes of carbonate and organic carbon in the ocean. Is the marine biological activity working as a sink of the atmospheric carbon? Tellus, 43B, 256–266.Google Scholar
  41. Tsurushima, N., Y. Nojiri, K. Imai and S. Watanabe (2002): Seasonal variations of carbon dioxide system and nutrients in the surface mixed layer at station KNOT (44°N, 155°E) in the subarctic western North Pacific. Deep-Sea Res. II, 49, 5377–5394.CrossRefGoogle Scholar
  42. Varela, D. E. and P. J. Harrison (1999): Seasonal variability in nitrogenous nutrition of phytoplankton assemblages in the northeastern subarctic Pacific Ocean. Deep-Sea Res. II, 46, 2505–2538.CrossRefGoogle Scholar
  43. Wakita, M., S. Watanabe, Y. W. Watanabe, T. Ono, N. Tsurushima and S. Tsunogai (2005): Temporal change of dissolved inorganic carbon in the subsurface water at station KNOT (44°N, 155°E) in the western North Pacific subpolar region. J. Oceanogr., 61, 129–139.CrossRefGoogle Scholar
  44. Waples, J. T., C. Benitez-Nelson, N. Savoye, M. Rutgers van der Loeff, M. Baskaran and O. Gustafsson (2006): An introduction to the application and future use of 234Th in aquatic systems. Mar. Chem., 100, 166–189.CrossRefGoogle Scholar
  45. Wong, C. S., N. A. D. Waser, Y. Nojiri, F. A. Whitney, J. S. Page and J. Zeng (2002a): Seasonal cycles of nutrients and dissolved inorganic carbon at high and mid latitudes in the North Pacific Ocean during the Skaugran cruises: determination of new production and nutrient uptake ratios. Deep-Sea Res. II, 49, 5317–5338.CrossRefGoogle Scholar
  46. Wong, C. S., N. A. D. Waser, F. A. Whitney, W. K. Johnson and J. S. Page (2002b): Time-series study of the biogeochemistry of the North East subarctic Pacific: reconciliation of the Corg/N remineralization and uptake ratios with the Redfield ratios. Deep-Sea Res. II, 49, 5717–5738.CrossRefGoogle Scholar
  47. Yamaguchi, A., Y. Watanabe, H. Ishida, T. Harimoto, K. Furusawa, S. Suzuki, J. Ishizaka, T. Ikeda and M. M. Takahashi (2002): Structure and size distribution of plankton communities down to the greater depths in the western North Pacific Ocean. Deep-Sea Res. II, 49, 5513–5530.CrossRefGoogle Scholar
  48. Zapata, M., F. Rodríguez and J. L. Garrido (2000): Separation of chlorophylls and carotenoids from marine phytoplankton: a new HPLC method using a reversed phase C8 column and pyridine-containing mobile phases. Mar. Ecol. Prog. Ser., 195, 29–45.CrossRefGoogle Scholar
  49. Zeng, J., Y. Nojiri, P. P. Murphy, C. S. Wong and Y. Fujinuma (2002): A comparison of ΔpCO2 distributions in the northern North Pacific using results from a commercial vessel in 1995–1999. Deep-Sea Res. II, 49, 5303–5315.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Hajime Kawakami
    • 1
  • Makio C. Honda
    • 1
  • Kazuhiko Matsumoto
    • 1
  • Tetsuichi Fujiki
    • 1
  • Shuichi Watanabe
    • 1
  1. 1.Mutsu Institute for OceanographyJapan Agency for Marine-Earth Science and TechnologyAomoriJapan

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