PRINCIPAL 

 INVESTIGATOR(S) 



Creighton D. Wirick 



Oceanographic & Atmospheric Sciences Division 



Brookhaven National Laboratory 



Upton, NY 11973 



PROJECT TITLE 



MOORED SENSING SYSTEMS 



AMOUNT OF FUNDING FY 1994: $147 K 



SUMMARY OF GOALS 



The goal of this project is to use moored measurements of dissolved oxygen to investigate 

 the carbon cycle on the continental margin near Cape Hatteras. The scientific objectives of this 

 project are: 



1) To quantify the reduction of carbon by photosynthesis using dissolved oxygen measurements. 



2) To quantify the oxidation of organic carbon occurring below the pycnocline using dissolved 

 oxygen measurements. 



3) To estimate the air-sea exchange of both C0 2 and 2 using boundary-layer transport models 

 driven by a limited set of meteorological, pC0 2 , 2 and total gas tension measurements. 



To accomplish these goals we propose to deploy oxygen sensors, BNL fluorometers, Fast 

 Repetition Rate (FRR) fluorometers, irradiance sensors, transmissometers, gas tension devices, 

 and a surface buoy to measure delta pC02 in the 1996 OMP field experiment. This project 

 includes: instrument preparation, participation in mooring cruises, and data analysis. 



SPATIAL AND TEMPORAL SAMPLING SCALES 



A three-dimensional moored array of ~16 moorings containing -100 oxygen sensors is 

 proposed to derive seasonal oxygen budgets from direct measurements. The scales of the moored 

 array are as follows: 



Size of Moored Array: 

 Horizontal Scale: 

 Vertical Scale: 

 Length of Deployment: 

 Sampling interval: 



40 km x 40 km 

 5-15 km between moorings 

 5-10 m between instruments 

 1 year total, 3 deployments 

 -10 minutes 



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