Publication Abstracts

Grewe et al. 2001

Grewe, V., D. Brunner, M. Dameris, J.L. Grenfell, R. Hein, D. Shindell, and J. Staehelin, 2001: Origin and variability of upper tropospheric nitrogen oxides and ozone at northern mid-latitudes. Atmos. Environ., 35, 3421-3433, doi:10.1016/S1352-2310(01)00134-0.

Year-long measurements of NOx and ozone performed during the NOXAR project are compared to results from the ECHAM4.L39(DLR)/CHEM (E39/C) and GISS coupled chemistry-climate models. The measurements were taken on flights between Europe and the eastern United States and between Europe and the Far East in the latitude range 40-65 N. Our comparison concentrates on the upper troposphere and reveals strong longitudinal variations in seasonal mean NOx of more than 200 pptv, which both models are able to reproduce qualitatively. Vertical profiles show maximum NOx values 2-3 km below the tropopause ("E-shape") with a strong seasonal cycle. E39/C simulates a maximum located at the tropopause and with a reasonable seasonal cycle. The GISS model reproduces the seasonal cycle but not the profile's shape due to its coarser vertical resolution. A comparison of NOx frequency distributions reveals that both models are capable of reproducing the observed variability, except that E39/C shows no very high NOx mixing ratios.

Both models show that lightning and surface NOx emissions contribute the most to the seasonal cycle of NOx at tropopause altitudes. The impact of lightning in the upper troposphere does not vary significantly with altitude, whereas the impact of surface emissions decreases with altitude. Among all sources, lightning contributes the most to the variability of NOx in the upper troposphere at northern mid-latitudes during summer.

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BibTeX Citation

  author={Grewe, V. and Brunner, D. and Dameris, M. and Grenfell, J. L. and Hein, R. and Shindell, D. and Staehelin, J.},
  title={Origin and variability of upper tropospheric nitrogen oxides and ozone at northern mid-latitudes},
  journal={Atmos. Environ.},

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RIS Citation

ID  - gr04000r
AU  - Grewe, V.
AU  - Brunner, D.
AU  - Dameris, M.
AU  - Grenfell, J. L.
AU  - Hein, R.
AU  - Shindell, D.
AU  - Staehelin, J.
PY  - 2001
TI  - Origin and variability of upper tropospheric nitrogen oxides and ozone at northern mid-latitudes
JA  - Atmos. Environ.
VL  - 35
SP  - 3421
EP  - 3433
DO  - 10.1016/S1352-2310(01)00134-0
ER  -

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