FastFind »   Lastname: doi:10.1029/ Year: Advanced Search  

AGU: Journal of Geophysical Research, Atmospheres

 

Index Terms

  • Atmospheric Composition and Structure: Biosphere/atmosphere interactions
  • Mathematical Geophysics: Modeling
  • Meteorology and Atmospheric Dynamics: Land/atmosphere interactions
  • Information Related to Geographic Region: Africa
Abstract
Cited By (7)
 

Abstract

Spatial and temporal variations in biogenic volatile organic compound emissions for Africa south of the equator

L. Otter

Climatology Research Group, University of the Witwatersrand, Johannesburg, South Africa

A. Guenther

National Center for Atmospheric Research, Boulder, Colorado, USA

C. Wiedinmyer

National Center for Atmospheric Research, Boulder, Colorado, USA

G. Fleming

Division of Water, Environment and Forestry Technology, Council for Scientific and Industrial Research, Pretoria, South Africa

P. Harley

National Center for Atmospheric Research, Boulder, Colorado, USA

J. Greenberg

National Center for Atmospheric Research, Boulder, Colorado, USA

Improved vegetation distribution and emission data for Africa south of the equator were developed for the Southern African Regional Science Initiative (SAFARI 2000) and were combined with biogenic volatile organic compound (BVOC) emission measurements to estimate BVOC emissions for the southern African region. The BVOCs are estimated to total 80 Tg C yr−1 for the region, with isoprene and monoterpenes contributing 56 and 7 Tg C yr−1, respectively. The large uncertainties, particularly in terms of basal emission capacity assignment, associated with these outputs are discussed. Woodlands are predicted to be the dominant vegetation type, covering 23% of southern Africa, and are the largest annual source of isoprene (20 Tg C), monoterpenes (3 Tg C), and other VOCs (4 Tg C). Mopane savannas and woodlands are predicted to contribute over 75% of all monoterpenes, primarily from light-dependent emission processes. Rain forests cover only 3.5% of the total area but have high annual emission rates (9.8 g C m−2 yr−1). In the tropical regions with high rainfall, warm temperatures, and high plant productivity throughout the year, the seasonal variation in VOC emissions was small. In subtropical regions, dominated by highly seasonal savannas and grasslands, large variations were predicted, with emissions declining by up to 85% during dry winter periods (June–August) due to low leaf area index after leaf drop.

Received 3 June 2002; accepted 9 January 2003; published 28 June 2003.

Citation: Otter, L., A. Guenther, C. Wiedinmyer, G. Fleming, P. Harley, and J. Greenberg (2003), Spatial and temporal variations in biogenic volatile organic compound emissions for Africa south of the equator, J. Geophys. Res., 108(D13), 8505, doi:10.1029/2002JD002609.

Cited By

Please wait one moment ...