Eddy correlation measurements of NO, NO{sub 2}, and O{sub 3} fluxes

Conference · Sat Jun 01 04:00:00 EDT 1996

OSTI ID:238353

Gao, W; Wesely, M L; Cook, D R; martin, T J

The micrometeorological technique of eddy correlation was used to measure the vertical fluxes of NO, NO{sub 2}, and ozone in rural North Carolian during spring 1995 as part of the Natural emission of Oxidant precurssors-Validation of techniques and Assessment (NOVA) field experiment. Net flux densities were measured at heights 5 and 10 m above an agricultural field with short corn plants and large amount of exposed bare soil between the rows. Large upward eddy fluxes of NO{sub 2} were seen, and strong NO emissions from the soil were measured by collaborators using environmental enclosures on the soil surface. Data indicate that about 50% of the nitrogen emitted from the soil as NO was converted into NO{sub 2} at 5 m. Rest of the emitted nitrogen may remain as NO flux and be returned back to the vegetation and soil by deposition. Divergence of the NO{sub 2} and O{sub 3} fluxes were detected between 5 and 10 m. This is consistent with likely net NO{sub 2} and O{sub 3} destruction rates. The data will be used to help develop parameterizations of the flux of nitrogen oxides into the lower troposphere.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Environmental Protection Agency, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 238353
• Report Number(s): ANL/ER/CP--88723; CONF-9605175--1; ON: DE96011130; CNN: Agreement DW89937295-01-0
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
ATMOSPHERIC CHEMISTRY
CROPS
EMISSION
MAIZE
NITRIC OXIDE
NITROGEN DIOXIDE
OZONE
SOILS
TROPOSPHERE