The Hawaii Ocean Time-series (HOT) program: Background, rationale and field implementation

Abstract Long-term ocean observations are needed to gain a comprehensive understanding of natural habitat variability as well as global environmental change that might arise from human activities. In 1988, a multidisciplinary deep-water oceanographic station was established at a site north of Oahu, Hawaii, with the intent of establishing a long-term ( > 20 years) data base on oceanic variability. The primary objective of the Hawaii Ocean Time-series (HOT) program is to obtain high-quality time-series measurements of selected oceanographic properties, including: water mass structure, dynamic height, currents, dissolved and particulate chemical constituents, biological processes and particulate matter fluxes. These data will be used, in part, to help achieve the goals of the World Ocean Circulation Experiment (WOCE) and the Joint Global Ocean Flux Study (JGOFS) research programs. More importantly, these data sets will be used to improve our description and understanding of ocean circulation and ocean climatology, to elucidate further the processes that govern the fluxes of carbon into and from the oceans, and to generate novel hypotheses. These are necessary prerequisites for developing a predictive capability for global environmental change.

[1]  R. Lukas,et al.  Interannual variability of Pacific deep- and bottom-waters observed in the Hawaii Ocean Time-series , 1996 .

[2]  M. Lyle,et al.  Flux comparisons between sediments and sediment traps in the eastern tropical Pacific: Implications for atmospheric C02 variations during the Pleistocene1 , 1985 .

[3]  David M. Karl,et al.  Seasonal and interannual variability in primary production and particle flux at Station ALOHA , 1996 .

[4]  D. Karl,et al.  A sea of change : monitoring the oceans' carbon cycle , 1991 .

[5]  R. Lukas,et al.  Seasonal cycles of temperature, salinity and dissolved oxygen observed in the Hawaii Ocean Time-series , 1996 .

[6]  D. Vaulot,et al.  Photosynthetic picoplankton community structure in the subtropical North Pacific Ocean near Hawaii (station ALOHA) , 1993 .

[7]  R. Feely,et al.  Atmospheric iron inputs and primary productivity: Phytoplankton responses in the North Pacific , 1991 .

[8]  Ricardo M Letelier,et al.  Role of Trichodesmium spp. in the productivity of the subtropical North Pacific Ocean , 1996 .

[9]  Ricardo M Letelier,et al.  Seasonal and interannual variations in photosynthetic carbon assimilation at Station , 1996 .

[10]  Wolfgang H Berger,et al.  Global maps of ocean productivity. , 1989 .

[11]  P. Brewer,et al.  The Global Ocean Flux Study (GOFS): Status of the U.S. GOFS Program , 1986 .

[12]  Peter H. Wiebe,et al.  Long time series study of oceanic ecosystems , 1987 .

[13]  L. Talley,et al.  Spatial Fluctuations North of the Hawaiian Ridge , 1986 .

[14]  E. Laws,et al.  Autotrophic production and elemental fluxes at 26°N, 155°W in the North Pacific subtropical gyre , 1989 .

[15]  S. Levitus.  Climatological Atlas of the World Ocean , 1982 .

[16]  N. Graham,et al.  Physical and biological consequences of a climate event in the central North Pacific , 1994 .

[17]  R. Eppley,et al.  A STUDY OF PLANKTON DYNAMICS AND NUTRIENT CYCLING IN THE CENTRAL GYRE OF THE NORTH PACIFIC OCEAN1 , 1973 .

[18]  E. Laws,et al.  High phytoplankton growth and production rates in the North Pacific subtropical gyre1,2 , 1987 .

[19]  Carl Ekdahl,et al.  Atmospheric carbon dioxide variations at Mauna Loa Observatory, Hawaii , 1976 .

[20]  E. Firing,et al.  Deep ocean acoustic Doppler current profiling , 1990, Proceedings of the IEEE Fourth Working Conference on Current Measurement.

[21]  B. Tilbrook,et al.  Oceanic Uptake of Fossil Fuel CO2: Carbon-13 Evidence , 1992, Science.

[22]  A. J. Troup,et al.  The ‘southern oscillation’ , 1965 .

[23]  Timothy C. Granata,et al.  The effect of temporal undersampling on primary production estimates , 1994 .

[24]  James W. Hurrell,et al.  Decadal atmosphere-ocean variations in the Pacific , 1994 .

[25]  Ricardo M Letelier,et al.  Ecosystem changes in the North Pacific subtropical gyre attributed to the 1991–92 El Niño , 1995, Nature.

[26]  D. Wilbur,et al.  Chemical tracers of productivity and respiration in the subtropical Pacific Ocean , 1995 .

[27]  R. Owen,et al.  Phytoplankton production: seasonal change in the oceanic eastern tropical Pacific , 1970 .

[28]  D. Karl,et al.  Dissolved organic carbon in oligotrophic waters: experiments on sample preservation, storage and analysis , 1994 .

[29]  P. Bienfang,et al.  Light effects on nutrient-limited, oceanic primary production , 1977 .

[30]  Wallace S. Broecker,et al.  The Carbon cycle and atmospheric CO[2] : natural variations Archean to present , 1985 .

[31]  D. Karl,et al.  Total dissolved nitrogen and phosphorus concentrations at US-JGOFS station ALOHA: Redfield reconciliation , 1993 .

[32]  J. Szyper,et al.  Phytoplankton dynamics in the subtropical Pacific Ocean off Hawaii , 1981 .

[33]  J. Toggweiler,et al.  A new model for the role of the oceans in determining atmospheric PCO2 , 1984, Nature.

[34]  E. Carpenter,et al.  Marine pelagic cyanobacteria : Trichodesmium and other diazotrophs , 1992 .

[35]  Anthony H. Knap,et al.  Overview of the U.S. JGOFS Bermuda Atlantic Time-series Study and the Hydrostation S program , 1996 .

[36]  I. Fung,et al.  Observational Contrains on the Global Atmospheric Co2 Budget , 1990, Science.

[37]  C. J. Carrillo,et al.  Air-sea carbon dioxide exchange in the North Pacific subtropical Gyre: Implications for the global carbon budget , 1994 .

[38]  M. Doty,et al.  The Island Mass Effect , 1956 .

[39]  D. Karl,et al.  Nitrite distributions and dynamics at Station ALOHA , 1996 .

[40]  D. Karl,et al.  Nitrogen Dynamics at the VERTEX Time-Series Site , 1992 .

[41]  E. Laws,et al.  Impact of an atmospheric-oceanic disturbance on phytoplankton community dynamics in the North Pacific Central Gyre , 1991 .

[42]  R. Hanson,et al.  Structure and Biological Dynamics of the Oligotrophic Ocean Photic Zone off the Hawaiian Islands , 1976 .

[43]  Andrew J. Watson,et al.  Evidence for slow mixing across the pycnocline from an open-ocean tracer-release experiment , 1993, Nature.

[44]  J. Marra,et al.  Primary production in the North Pacific Central Gyre: some new measurements based on 14C , 1987 .

[45]  T. Dickey,et al.  The emergence of concurrent high‐resolution physical and bio‐optical measurements in the upper ocean and their applications , 1991 .

[46]  P. Falkowski,et al.  Phytoplankton productivity in the North Pacific ocean since 1900 and implications for absorption of anthropogenic CO2 , 1992, Nature.

[47]  D. M. Glover,et al.  Dynamics of the transition zone in coastal zone color scanner-sensed ocean color in the North Pacific during oceanographic spring , 1994 .

[48]  Gene E. Likens,et al.  Biogeochemistry of a Forested Ecosystem , 1978, Springer New York.

[49]  Gene E. Likens,et al.  Biogeochemistry of a Forested Ecosystem , 1996, Springer New York.

[50]  E. Laws,et al.  Primary production in the deep blue sea , 1990 .

[51]  D. Karl,et al.  New Production at the Vertex Time-Series Site , 1990 .

[52]  Ricardo M Letelier,et al.  Tricho-desmium blooms and new nitrogen in the North Pacific gyre , 1992 .

[53]  J. Mcgowan,et al.  Mixing and oceanic productivity , 1978 .

[54]  Alan R. Longhurst,et al.  The biological pump: profiles of plankton production and consumption in the upper ocean , 1989 .

[55]  M. R. Abbott,et al.  Estimating ocean primary production from satellite chlorophyll - Introduction to regional differences and statistics for the Southern California Bight , 1985 .

[56]  Douglas A. Wolfe,et al.  Long-term biological data sets: Their role in research, monitoring, and management of estuarine and coastal marine systems , 1987 .

[57]  K. Wyrtki.  Fluctuations of the Dynamic Topography in the Pacific Ocean , 1975 .

[58]  W. G. Harrison,et al.  Primary productivity and size structure of phytoplankton biomass on a transect of the equator at 135°W in the Pacific Ocean , 1990 .

[59]  J. Szyper,et al.  Temporal and spatial variability of phytoplankton in a subtropical ecosystem1,2 , 1984 .

[60]  G. Mitchum.  On using satellite altimetric heights to provide a spatial context for the Hawaii Ocean Time-series measurements , 1996 .

[61]  T. Platt,et al.  Vertical Nitrate Fluxes in the Oligotrophic Ocean , 1986, Science.

[62]  D. Cayan,et al.  Climate and Chlorophyll a: Long-Term Trends in the Central North Pacific Ocean , 1987, Science.

[63]  S. Chiswell.  Intra-annual oscillations at Station ALOHA, north of Oahu, Hawaii , 1996 .

[64]  E. Firing.  Currents observed north of Oahu during the first five years of HOT , 1996 .

[65]  G. I. Roden.  Aspects of the Mid-Pacific Transition Zone , 1970 .

[66]  E. Duursma.  Productivity of the ocean: Present and past: Edited by W.H. Berger, V.S. Smetacek and G. Wefer. John Wiley & Sons, Chichester, UK 1989. A Dahlem Workshop Report, Life Sciences Research Rep. 44. xiii + 471 pp. ISBN 0-471-92246-3 , 1992 .

[67]  T. Hayward.  The nutrient distribution and primary production in the central North Pacific , 1987 .

[68]  S. Emerson,et al.  Gas supersaturation in the surface ocean: The roles of heat flux, gas exchange, and bubbles , 1996 .

[69]  Giacomo R. DiTullio,et al.  Primary productivity and particle fluxes on a transect of the equator at 153°W in the Pacific Ocean , 1984 .

[70]  D. Halpern,et al.  The hawaii to tahiti shuttle experiment. , 1981, Science.

[71]  T. Hayward,et al.  Primary production in the North Pacific Central Gyre: A controversy with important implications. , 1991, Trends in ecology & evolution.

[72]  John A. McGowan,et al.  Structure in the Copepod Community of the North Pacific Central Gyre , 1979 .

[73]  Kenneth W. Bruland,et al.  Fluxes of particulate carbon, nitrogen, and phosphorus in the upper water column of the northeast Pacific , 1979 .

[74]  R. Lukas,et al.  Saline intrusions in the intermediate waters north of Oahu, Hawaii , 1996 .

[75]  Ralph F. Keeling,et al.  Seasonal and interannual variations in atmospheric oxygen and implications for the global carbon cycle , 1992, Nature.

[76]  R. Bidigare,et al.  Temporal variability of phytoplankton community structure based on pigment analysis , 1993 .

[77]  S. Daniels-McQueen,et al.  Derepression of ferritin messenger RNA translation by hemin in vitro. , 1990, Science.

[78]  David M. Karl,et al.  VERTEX: carbon cycling in the northeast Pacific , 1987 .