Hawaii Ocean Time-series (HOT) program Marine Microplankton Ecology

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Presentation transcript:

Hawaii Ocean Time-series (HOT) program Marine Microplankton Ecology An Introduction to the Hawaii Ocean Time-series (HOT) program and Station ALOHA Marine Microplankton Ecology OCN 626

One of the required assignments for OCN 626 is for each of you to give a talk (12 minutes) and write a report on a microbially-relevant aspect of the HOT program. Some examples: Dynamics of primary production A comparison of plankton biomass at Station ALOHA and at BATS (Sargasso Sea) Temporal variability in the diversity of photosynthetic plankton

HOT and Station ALOHA Hawaii Ocean Time series (HOT) began as a central component of the Joint Global Ocean Flux Study in 1988. Continuous time series record of biogeochemical and physical oceanographic properties at study site Station ALOHA (22°45’N, 158°W) Station ALOHA is occupied for 1 week every month

Historical Highlights Leading to HOT 1979 Coastal Zone Color Scanner (CZCS) is launched October 1988 First research cruise to Station ALOHA (A Long-term Oligotrophic Habitat Assessment) 1986-1988 Vertical Transport and Exchange (VERTEX) program August 2008 204 Cruises to Station ALOHA 1961 Menzel and Ryther publish 3 years of biogeochemical measurements at Station S 1987 Global Ocean Flux Study begins 1976 Keeling publishes ~18 year record of atmospheric CO2 measurements at Mauna Loa, Hawaii December 1998 100 cruises to Station ALOHA 1988 US National Science Foundation grants to D. Karl (U. Hawaii) and A. Knap (BBSR) for establishment of two deep-ocean time series stations (HOT and BATS) 1954 Stommel and Sutcliffe begin bimonthly measurements at Hydrostation “S” 28 km SE of Bermuda James Watt

Station ALOHA and the North Pacific Subtropical Gyre (NPSG) 15°N to 35°N 135°E to 135°W One of the largest ecosystems on the planet ALOHA NPSG Station ALOHA 4800 m deep

HOT BATS

Characteristic features of the subtropical gyre habitats Very low nutrient concentrations Light penetrates deep into the upper ocean Deep chlorophyll maximum Small plankton Very rapid nutrient recycling Very important to global carbon cycle (by virtue of their enormous size)

Objectives of the HOT program (circa 1996) Understand seasonal and interannual variability in rates of production and particle export. Determine the mechanisms and rates of nutrient input and recycling in the upper 200 m of the water column. Measure time varying concentrations of CO2 in the upper ocean and estimate annual air-sea gas fluxes

HOT Program Highlights (specific to marine microbiology) Bacteria are predominate photosynthetic organisms (Prochlorococcus and Synechococcus). Climate-dependence to plankton biomass and productivity. Higher than anticipated rates of primary production (> 14 mol C m-2 yr-1). Archaea numerically dominate mesopelagic (> 200 m) plankton assemblages.

HOT-DOGS Data Types Data Modules CTD: Seabird sensor package Bottle: 24-place rossette and 12L niskin bottles Particle Flux: floating sediment traps Primary Production : in-situ incubated 14C Data Modules Data Extraction: text columns of data Display: vertical profiles Standard Depths: summary & comparative plots Time-Series: integral, means & horizons

Partial list of microbially-relevant measurements at Station ALOHA Temperature, Salinity, Density dissolved O2, dissolved inorganic carbon, pH Dissolved inorganic nutrients (nitrate, nitrite, phosphorus, silica) Particulate nitrogen, carbon, and phosphorus Pigments Primary production Various measures of plankton biomass Plankton cell abundances (Prochlorococcus, Synechococcus, non-pigmented picoplankton). Particle export (carbon, nitrogen, phosphorus fluxes)

A few ideas for topics… “Variability in primary production at Station ALOHA” Data sets available: 14C-bicarbonate assimilation rates, changes in O2 “A comparison of plankton biomass and productivity at Station ALOHA and BATS” Data sets available: bacterial cell abundances, chlorophyll, primary production, etc. “Temporal variability in the diversity and biomass of photosynthetic plankton” Data sets available: HPLC pigment concentrations, flow cytometric cell abundances

http://hahana.soest.hawaii.edu/hot/hot-dogs/interface.html