PRINCIPAL 



INVESTIGATOR(S) David W. Chipman and Taro Takahashi 



Both at: Lamont-Doherty Geological Observatory 



Columbia University 

 Rte. 9W 

 Palisades, NY 10983 



PROJECT TITLE DETERMINATION OF OCEAN/ATMOSPHERE CARBON 



DIOXIDE FLUX WITHIN OMP SURVEY AREA (PROPOSED 

 REVISED TITLE OF ORIGINAL PROJECT "DEVELOPMENT 

 OF GAS CHROMATOGRAPHIC SYSTEM FOR DISSOLVED 

 ORGANIC CARBON ANALYSIS IN SEAWATER") 



AMOUNT OF FUNDING FY 1993: $81 K 



SUMMARY OF GOALS 



The original goal of our project, to develop a GC-based technique for the analysis of DOC 

 in seawater in order to provide insight into the apparent extra DOC which was then being 

 observed by a number of workers using IR-based systems, was made essentially moot between 

 the time our original proposal was written and the time it was funded. The controversy over the 

 extra DOC was removed when it was recognized that the large blank associated with the catalyst 

 used in the oxidation of the DOC was not being fully characterized; in addition, a GC-based 

 system virtually identical to that which we had proposed was independently developed by a group 

 at WHOI. 



At the same time, it became obvious that one component of the carbon budget in the 

 waters of the OMP field area (ocean/atmosphere C0 2 flux) was not being measured by any of 

 the other investigators involved in the OMP. This is a measurement with which the Lamont 

 group has considerable experience. With the encouragement of the OMP project managers at 

 DOE, we have redirected our involvement in the program in order to fill the perceived gap. 



Revised goal: To determine the magnitude of the carbon dioxide flux across the air-sea interface 

 over the OMP survey area. 



SPATIAL AND TEMPORAL SAMPLING SCALES 



Determination of carbon dioxide partial pressure in surface seawater and overlying 

 atmosphere needs to be carried out at least during four (preferably five or six) periods within a 



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