Photochemistry of biogenic emissions over the Amazon forest

DSpace/Manakin Repository

Photochemistry of biogenic emissions over the Amazon forest

Citable link to this page

 

 
Title: Photochemistry of biogenic emissions over the Amazon forest
Author: Jacob, Daniel James; Wofsy, Steven Charles

Note: Order does not necessarily reflect citation order of authors.

Citation: Jacob, Daniel J., and Steven C. Wofsy. 1988. “Photochemistry of Biogenic Emissions over the Amazon Forest.” Journal of Geophysical Research 93 (D2): 1477. doi:10.1029/jd093id02p01477.
Full Text & Related Files:
Abstract: The boundary layer chemistry over the Amazon forest during the dry season is simulated with a photochemical model. Results are in good agreement with measurements of isoprene, NO, ozone, and organic acids. Photochemical reactions of biogenic isoprene and NO can supply most of the ozone observed in the boundary layer. Production of ozone is very sensitive to the availability of NO, but is insensitive to the isoprene source strength. High concentrations of total odd nitrogen (NO,) are predicted for the planetary boundary layer, about 1 ppb in the mixed layer and 0.75 ppb in the convective cloud layer. Most of the odd nitrogen (≈70%) is present as PAN‐type species, which are removed by dry deposition to the forest. The observed daytime variations of isoprene are explained by a strong dependence of the isoprene emission flux on sun angle. Nighttime losses of isoprene exceed rates of reaction with NO and O and appear to reflect dry‐deposition processes. The 24‐hour averaged isoprene emission flux is calculated to be 38 mg m d. Photooxidation of isoprene could account for a large fraction of the CO enrichment observed in the boundary layer under unpolluted conditions and could constitute an important atmospheric source of formic acid, methacrylic acid, and pyruvic acid.
Published Version: doi:10.1029/JD093iD02p01477
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:14121764
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)

 
 

Search DASH


Advanced Search
 
 

Submitters