Deep Sea Research Part II: Topical Studies in Oceanography

Volume 42, Issues 2-3

A U.S. JGOFS Process Study in the Equatorial Pacific


J.W. Murray




Elsevier Science


Pages 275-903


262 x 192 mm




Equatorial Pacific Carbon Cycle: A two-part special issue (Volume 42, Issue 2-3 and Volume 43, Issue 4-6) has been prepared summarizing the results from the JGOFS Process Study (EqPac) in the central and eastern equatorial Pacific. Most of the papers are from the US JGOFS study but the France and Australia JGOFS studies are also represented. The purpose of this study was to determine the fluxes of carbon and related elements, and processes controlling those fluxes, between the euphotic zone and the atmosphere and deep ocean. The US JGOFS study was conducted in 1992 and consisted of survey and time series cruises designed to observe a wide range of temporal and spatial scales. The dominant oceanographic event during this period was the 1991-1992 El Niño.

The equatorial Pacific plays an important role in the global carbon cycle. Because of upwelling, the CO2 in the surface water is high and this region is the ocean's largest source to the atmosphere. It may also contribute a significant fraction of the ocean's new production. The magnitude of these fluxes varies interannually in association with the El Niño Southern Oscillation (ENSO). At the same time, it is considered a high nutrient-low chlorophyll (HNLC) regime, which means that the fluxes are low for the nutrient levels present. The record of how these fluxes changed in the past is preserved in the underlying sediments.


1.    A U.S. JGOFS Process Study in the equatorial Pacific (EqPac): Introduction, Pages 275-293

James W. Murray, Eric Johnson and Chris Garside

2.    The 1991-1993 El Niño in the central Pacific, Pages 295-333

William S. Kessler and Michael J. McPhaden

3.    Euphotic-zone nutrient algorithms for the NABE and EqPac study sites, Pages 335-347

C. Garside and J. C. Garside

4.    Sea-surface partial pressure of carbon dioxide in the eastern equatorial Pacific (August 1991 to October 1992): A multivariate analysis of physical and biological factors, Pages 349-364

Yves Dandonneau

5.    CO2 distributions in the equatorial Pacific during the 1991-1992 ENSO event, Pages 365-386

Richard A. Feely, Rik Wanninkhof, Catherine E. Cosca, Paulette P. Murphy, Marilyn F. Lamb and Matthew D. Steckley

6.    Seasonal and lateral variations in carbon chemistry of surface water in the eastern equatorial Pacific during 1992, Pages 387-409

Rik Wanninkhof, Richard A. Feely, Donald K. Atwood, George Berberian, Doug Wilson, Paulette P. Murphy and Marilyn F. Lamb

7.    The role of pH measurements in modern oceanic CO2-system characterizations: Precision and thermodynamic consistency, Pages 411-429

Tonya D. Clayton, Robert H. Byrne, Jabe A. Breland, Richard A. Feely, Frank J. Millero, Douglas M. Campbell, Paulette P. Murphy and Marilyn F. Lamb

8.    Primary productivity and trace-metal contamination measurements from a clean rosette system versus ultra-clean Go-Flo bottles, Pages 431-440

Marta P. Sanderson, Craig N. Hunter, Steve E. Fitzwater, R. Michael Gordon and Richard T. Barber

9.    Phytoplankton photosynthesis parameters along 140W in the equatorial Pacific, Pages 441-463

Steven T. Lindley, Robert R. Bidigare and Richard T. Barber

10. The diel cycle in the integrated particle load in the equatorial Pacific: A comparison with primary production, Pages 465-477

Ian D. Walsh, Pyo Chung Sung, Mary Jo Richardson and Wilford D. Gardner

11.   228Ra-derived nutrient budgets in the upper equatorial Pacific and the role of "new" silicate in limiting productivity, Pages 479-497

Ku Teh-Lung, Luo Shangde, Masashi Kusakabe and James K. B. Bishop

12. Plankton productivity and biomass in the western equatorial Pacific: Biological and physical controls, Pages 499-533

D. J. Mackey, J. Parslow, H. W. Higgins, F. B. Griffiths and J. E. O'Sullivan

13. Micro-phytoplankton of the equatorial Pacific: 140W meridianal transect during the 1992 El Niño, Pages 535-558

Irena Kaczmarska and Greta A. Fryxell

14. Micro-phytoplankton at the equatorial Pacific (140W) during the JGOFS EqPac Time Series studies: March to April and October 1992, Pages 559-583

J. L. Iriarte and G. A. Fryxell

15. Nanoplankton of the equatorial Pacific with emphasis on the heterotrophic protists, Pages 585-602

H. A. ThomsenN. Vørs, K. R. Buck, F. P. Chavez, W. Eikrem, L. E. Hansen and J. B. Østergaard

16. Biomass and biomass production of heterotrophic bacteria along 140W in the equatorial Pacific: Effect of temperature on the microbial loop, Pages 603-619

David L. Kirchman, James H. Rich and Richard T. Barber

17. Bacterioplankton dynamics in the equatorial Pacific during the 1992 El Niño, Pages 621-638

Hugh W. Ducklow, Helen L. Quinby and Craig A. Carlson

18. Dissolved organic carbon in the upper ocean of the central equatorial Pacific Ocean, 1992: Daily and finescale vertical variations, Pages 639-656

C. A. Carlson and H. W. Ducklow

19. Microzooplankton grazing in the central equatorial Pacific during February and August, 1992, Pages 657-671

John ConstantinouJulie KirshteinMichael R. Landry

20. Zooplankton variability on the equator at 140W during the JGOFS EqPac study, Pages 673-693

Michael R. Roman, Hans G. Dam, Anne L. Gauzens, Juanita Urban-Rich, David G. Foley and Tommy D. Dickey

21. Latitudinal variations in mesozooplankton grazing and metabolism in the central tropical Pacific during the U.S. JGOFS EqPac study, Pages 695-714

Zhang X., H. G. Dam, J. R. White and M. R. Roman

22. Latitudinal gradients in zooplankton biomass in the tropical Pacific at 140W during the JGOFS EqPac study: Effects of El Niño, Pages 715-733

Jacques R. White, Zhang Xinsheng, Leigh A. Welling, Michael R. Roman and Hans G. Dam

23. Mesozooplankton grazing and metabolism at the equator in the central Pacific: Implications for carbon and nitrogen fluxes, Pages 735-756

Hans G. Dam, Zhang Xinsheng, Mari Butler and Michael R. Roman

24. The oceanic mixed-layer pump, Pages 757-775

Wilford D. Gardner, Chung Sung Pyo, Mary Jo Richardson and Ian D. Walsh

25. Regional estimates of the export flux of particulate organic carbon derived from thorium-234 during the JGOFS EqPac program, Pages 777-804

Ken O. Buesseler, John A. Andrews, Mary C. Hartman, Rebecca Belastock and Chai Fei

26. Tracing particle cycling in the upper ocean with 230Th and 228Th: An investigation in the equatorial Pacific along 140W, Pages 805-829

Luo Shangde, Ku Teh-Lung, Masashi Kusakabe, James K. B. Bishop and Yang Yong-Liang

27. Export production of particles to the interior of the equatorial Pacific Ocean during the 1992 EqPac experiment, Pages 831-870

Susumu Honjo, Jack Dymond, Robert Collier and Steven J. Manganini

28. Early diagenesis of biogenic opal: Dissolution rates, kinetics, and paleoceanographic implications, Pages 871-903

James McManus, Douglas E. Hammond, William M. Berelson, Tammy E. Kilgore, David J. Demaster, Olivier G. Ragueneau and Robert W. Collier