Table of Contents

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

   PI:             Brent Lewis and George Luther
   of:             University of Delaware
   dataset:        Dissolved manganese concentrations from CTD casts
   dates:          March 15, 1995 to April 08, 1995
   location:       N: 22.4858  S: 9.9993  W: 58.0005  E: 68.7302
   project/cruise: Arabian Sea/TTN-045, Process cruise #2 (Spring Intermonsoon)
   ship:           R/V Thomas Thompson
 
   Lewis Note regarding 9/98 re-submission of data:
   Data for dissolved and total dissolvable Mn have been corrected to
   account for a prior error in calibration.  Current values have been
   verified by comparison to the NASS-4 SRM and by DDDC/APDC extraction
   with GFAAS analysis.
 
 

Brent Lewis notes and methods for manganese concentrations

Notes:

    1. Dissolved manganese (Mn) concentrations are in nmoles/liter.

    2. Filtered (Mn_filt) samples were passed through a 0.45 micron
    membrane filter.

    3. Samples were acidified with Q-HCl to pH 

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).