work has focused on analysis of the effect of the real and imaginary index
of refraction and aerosol particle size distribution upon extinction,
scattering and absorption in the atmosphere. Relatively recent work involved
the propagation of electromagnetic radiation through aerosol and cloud
media in the laboratory, using visible and middle IR (using a CO2
field research programme is focused on the measurement of black carbon
absorption (and mass concentration), ongoing since 1989. The seasonal
and air mass influence on black carbon levels are being investigated.
Measurements of aerosol scattering coefficient have recently (since summer
1997) been investigated at Mace Head. Recent relevant publications arising
from the work are given.
generation sunphotometer called a Precision Filter Radiometer (PFR) was
installed at the site in early July, 1999. The PFR is designed, tested
and calibrated by the World Optical Depth Research and Calibration Centre
(WORCC) at Physikalisch Meteorologisches Observatorium, Davos, Switzerland,
funded by the Swiss Federal Government as a contribution to the World
Meteorological Organisation, Global Atmosphere Watch (GAW) programme.
Mace Head is one of three initial GAW global sites to be equipped with
PFR instrumentation. Aerosol optical depth measurement is determined using
the PFR, which is mounted on a Brusag solar tracker.
CD. On the spatial extent and evolution of coastal aerosol plumes. J.
Geophys. Res., in press 2002.
Ch., C.D. O'Dowd, S. O'Riely, S.G. Jennings, P. Aalto, E. Becker, G.
Kunz, and G. de Leeuw. The relative scattering of sub and super micron
particles to aerosol light scattering in the marine boundary layer (MBL).,
J. Geophys. Res., in press, 2002
C.D., Biogenic coastal aerosol production and its influence on aerosol
radiative properties, Jr. Geophys. Res., 106, 1545-1550, 2001
S.G., McGovern, F.M., and Cooke, W.F. (1993). Mass concentration of
aerosol black carbon at Mace Head on the west coast of Ireland. Atmos.
Environ., 27A, 1229-1239.
Louisse, C., Cachier, H., and Jennings, S.G. (1993). Optical and thermal
measurements of black carbon aerosol contents in different environments:
variation of the specific attenuation cross-section. Atmos. Environ.,
Jennings, S.G., O'Dowd, C.D., Cooke, W.F., Sheridan, P.J., and Cachier,
H. (1994). Volatility of elemental carbon. Geophys. Res. Letts., 21.
Jennings, S.G., Spain, T.G., Doddridge, B.G., Maring, H., Kelly, B.P.,
and Hansen, A.D.A. (1996). Concurrent measurements of black carbon aerosol
and carbon monoxide at Mace Head. J. Geophys. Res., 101, 19,447-19454.
Jennings, S.G., Geever, M., Mc Govern, F.M., Francis, J., Spain,T. G.
and Donaghy,T. (1997). Microphysical and physico-chemical characterisation
of atmospheric aerosol at Mace Head. Atmos. Environ.,31, 2795-2808.
Cooke, W.F., Jennings, S.G., and Spain, T.G. (1997). Black carbon measurements
at Mace Head, 1989-1996. J. Geophys. Res.,102,25,339-25,346.
R., Jennings, S.G., Larson, S.M., Dillner, A., Cachier, H., Galambos,
Z., Rouc, A. and Spain, T.G. (1999). Intercomparison of measurement
methods for black carbon aerosols. Atmos. Environ., 33, 2823-2833.