Table of Contents

• Dataset Description
  • Methods & Sampling
• Data Files
• Parameters
• Instruments
• Deployments
• Project Information
• Program Information
• Funding

HPLC measured pigments by size fraction for selected stations

   PI:        Robert R. Bidigare
   of:        University of Hawaii
   dataset:   Pigment size fractions, HPLC method, from bottle casts
   dates:     November 02, 1995 to November 18, 1995 
   location:  N: 23.1289  S: 10.0871  W: 57.2737  E: 67.1208 
   cruise:    TTN-053, Arabian Sea Process cruise #6 (bio-optics)
   ship:      R/V Thomas Thompson
 
 

 
Robert Bidigare
University of Hawaii

Notes on Sampling Methodology


The distribution of pigments in different size fractions was
investigated at the six long stations occupied during each cruise.
Seawater samples were collected from fours depths:  one in the mixed
layer, and the other three above, within and below the deep chlorophyll
maximum layer.  Size-fractionated pigment samples were prepared by
serially passing seawater (1-4 L) through 25 mm Gelman in-line filter
holders equipped with filters of decreasing porosity.  These included
18 and 2 micron Poretics polycarbonate filters, followed by a Whatman
GF/F glass fiber filter (nominal porosity of 0.7 micron).  Filters were
wrapped in aluminum foil, immediately frozen in liquid nitrogen,
shipped to Hawaii following each cruise, and stored at -80oC until HPLC
analysis.

The U.S. Arabian Sea Expedition which began in September 1994 and ended in January 1996, had three major components: a U.S. JGOFS Process Study, supported by the National Science Foundation (NSF); Forced Upper Ocean Dynamics, an Office of Naval Research (ONR) initiative; and shipboard and aircraft measurements supported by the National Aeronautics and Space Administration (NASA). The Expedition consisted of 17 cruises aboard the R/V Thomas Thompson, year-long moored deployments of five instrumented surface buoys and five sediment-trap arrays, aircraft overflights and satellite observations. Of the seventeen ship cruises, six were allocated to repeat process survey cruises, four to SeaSoar mapping cruises, six to mooring and benthic work, and a single calibration cruise which was essentially conducted in transit to the Arabian Sea.

The United States Joint Global Ocean Flux Study was a national component of international JGOFS and an integral part of global climate change research.

The U.S. launched the Joint Global Ocean Flux Study (JGOFS) in the late 1980s to study the ocean carbon cycle. An ambitious goal was set to understand the controls on the concentrations and fluxes of carbon and associated nutrients in the ocean. A new field of ocean biogeochemistry emerged with an emphasis on quality measurements of carbon system parameters and interdisciplinary field studies of the biological, chemical and physical process which control the ocean carbon cycle. As we studied ocean biogeochemistry, we learned that our simple views of carbon uptake and transport were severely limited, and a new "wave" of ocean science was born. U.S. JGOFS has been supported primarily by the U.S. National Science Foundation in collaboration with the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, the Department of Energy and the Office of Naval Research. U.S. JGOFS, ended in 2005 with the conclusion of the Synthesis and Modeling Project (SMP).