References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-9-5729-2009

The influence of biogenic emissions from Africa on tropical tropospheric ozone during 2006: a global modeling study

Williams

J. E.

¹ Scheele

M. P.

¹ van Velthoven

P. F. J.

¹ Cammas

J.-P.

² ³ Thouret

² ³ Galy-Lacaux

³ Volz-Thomas

⁴

Royal Netherlands Meteorological Institute, De Bilt, The Netherlands

Université de Toulouse, UPS, LA (Laboratorie d'Aerologie), 31400 Toulouse, France

Laboratorie d'Aeronomie, (UMR UPS/CNRS 5560), Observatoire Midi-Pyrénées, Toulouse, France

Institut für Chemie and Dynamik der Geosphäre II: Troposphäre, Förschungszentrum Jülich, Jülich, Germany

11 08 2009

9 15 5729 5749

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We have performed simulations using a 3-D global chemistry-transport model to investigate the influence that biogenic emissions from the African continent exert on the composition of the troposphere in the tropical region. For this purpose we have applied two recently developed biogenic emission inventories provided for use in large-scale global models (Granier et al., 2005; Lathière et al., 2006) whose seasonality and temporal distribution for biogenic emissions of isoprene, other volatile organic compounds and NO is markedly different. The use of the 12 year average values for biogenic emissions provided by Lathière et al. (2006) results in an increase in the amount of nitrogen sequestrated into longer lived reservoir compounds which contributes to the reduction in the tropospheric ozone burden in the tropics. The associated re-partitioning of nitrogen between PAN, HNO3 and organic nitrates also results in a ~5% increase in the loss of nitrogen by wet deposition. At a global scale there is a reduction in the oxidizing capacity of the model atmosphere which increases the atmospheric lifetimes of CH4 and CO by ~1.5% and ~4%, respectively. Comparisons against a range of different measurements indicate that applying the 12 year average of Lathière et al. (2006) improves the performance of TM4_AMMA for 2006 in the tropics. By the use of sensitivity studies we show that the release of NO from soils in Africa accounts for between ~2–45% of tropospheric ozone in the African troposphere, ~10% in the upper troposphere and between ~5–20% of the tropical tropospheric ozone column over the tropical Atlantic Ocean. The subsequent reduction in OH over the source regions allows enhanced transport of CO out of the region. For biogenic volatile organic C1 to C3 species released from Africa, the effects on tropical tropospheric ozone are rather limited, although this source contributes to the global burden of VOC by between ~2–4% and has a large influence on the organic composition of the troposphere over the tropical Atlantic Ocean.

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