Global Synthesis of POC Using Satellite Data calibrated with Transmissometer
and POC Data from JGOFS/WOCE

National Science Foundation Grant No. 9986762

Poster presented to the JGOFS-SMP Workshop, July 16-20, 2001, Woods Hole, MA.

Global POC assessment based on transmissometer data

Alexey Mishonov, Wilford Gardner, Mary Jo Richardson
Texas A&M University, College Station, TX, 77843
Department of Oceanography

During the first year of this project all transmissometer data available from WOCE, JGOFS, S.A.V.E., and some other sources were collected, quality controlled, edited, and format transformed. All transmissometer data are loaded into an intermediate data base and sections of Beam Attenuation Coefficient (Beam Cp) have been constructed for all WOCE, S.A.V.E., and others lines in the Atlantic, Pacific, Indian, and Southern Oceans.
Relationship between Beam Cp and Particulate Organic Carbon (POC) was evaluated based on jointly acquired data sets in the Atlantic. These data sets for the Atlantic were obtained during the JGOFS NABE expedition and at the Bermuda Atlantic Time Series. These two data sets contain about 800 data pairs and yield a high correlation (>0.9) between these two variables. This correlation allows us to calculate the POC values based on transmissometer data and build the sections and maps of the POC distribution for the Atlantic Ocean.
Data for the Pacific Ocean will be our next target. Correlation between Beam Cp and POC will be assessed based on Ross Sea, Antarctic Polar Front Zone and Hawaii Oceanographic Time (HOT) Series data sets. Preliminary evaluation of the HOT Series shows that the transmissometer data need some attention before they could be used for joint analysis.
The web-site of the "Global Synthesis of POC Using Satellite Data calibrated with Transmissometer and POC Data from JGOFS/WOCE" project ( was launched, which provides access to all sections and maps created.

PowerPoint presentation

NSF-SMP 9986726 Project web & CD / Updated: 12-Apr-2004 / 2004 A. Mishonov