A TUNABLE LASER BASED MONITOR FOR HOCI AND HCI IN THE MARINE TROPOSPHERE

Award Information
Agency:
National Science Foundation
Branch
n/a
Amount:
$398,094.00
Award Year:
1996
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
27381
Agency Tracking Number:
27381
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
45 Manning Rd, Billerica, MA, 01821
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
David D Nelson
(508) 663-9500
Business Contact:
() -
Research Institute:
n/a
Abstract
THE POSSIBILITY THAT ATOMIC CHLORINE CONCENTRATIONS IN THE MARINE SURFACE LAYER ARE LARGE ENOUGH TO COMPETE WITH OH AS THE MAJOR TROPOSPHERIC OXIDIZER HAS RECEIVED CONSIDERABLE SPECULATION. CHLORINE ATOMS PARTICIPATE IN THE OXIDATION OF HYDROCARBONS AND DIMETHYL SULFIDE AND CAN ALSO DIRECTLY INFLUENCE TROPOSPHERIC OZONE LOSS THROUGH CATALYTIC CYCLES WITH C1O AND HO2 RADICALS. THE NET EFFECT ON THE OZONE BUDGET MAY BE HIGHLY DEPENDENT ON THE PARTITIONING OF THE INORGANIC CHLORINE POOL BETWEEN HC1, HOC1, C12, AND C1ONO2. IN ORDER TO ASSESS THE POTENTIAL IMPORTANCE OF CHLORINE CHEMISTRY, DIRECT MEASUREMENTS OF THESE SPECIES ARE NECESSARY. RESEARCHERS ARE ASSESSING THE FEASIBILITY OF DETECTING HOC1 AT THE 10 TO 20 PPT LEVEL USING TUNABLE DIODE LASER INFRARED ABSORPTION. THIS REQUIRES: (1) MEASUREMENT OF PRESSURE BROADENING COEFFICIENTS FOR SELECTED ABSORPTION LINES; (2) IDENTIFICATION OF SUITABLE SPECTRAL REGIONS; (3) INVESTIGATION OF PHOTOLYTIC MODULATION OF HOC1 TO IMPLEMENT BACKGROUND SUBTRACTION; AND (4) DESIGN OF NOVEL MULTIPLE PASS ABSORPTION CELL WITH A PATH LENGTH OF AT LEAST 600 METERS.

* information listed above is at the time of submission.

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