OMI Science Team Meeting Helsinki, June 24-27, 2008 Antti Arola. About the status and outlook for OMI Surface UV product. Aapo left FMI about three months ago.
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OMI Science Team Meeting
Helsinki, June 24-27, 2008
Aapo left FMI about three months ago.
Since then, I have been responsible for the scientific development of OMUVB, while Simo Tukiainen has been responsible for the processing related issues.
Puijo tower measurements
Finnish meteorological institute and Univ. of Kuopio
Aerosol particle size distribution (7-900 nm)* simultaneously in and out of cloud”
Aerosol particle size distribution (0.25-32 m)
Total particle number concentration
Cloud drop size distribution (2-50 m)
Cloud condensation nucleus (CCN) concentration
Weather parameters (T, RH, p, wind 2D)
Gas concentrations (NO-NOx, O3, SO2, CO)
DMPS = differential mobility particle sizer; ADM = ambient dust monitor; CPC = condensation particle counter; CDP = cloud droplet probe; CCNC = cloud condensation nuclei counter; NM = nephelometer;MAAP = multi-angle absorption photometer; WXT = weather transmitter; PWD = present weather detector;AIS = Air Ion Spectrometer
Provide a long term data set to:
Inherits from the TOMS UV algorithm based on look-up-tables made with various radiative transfer models.
Calculate clear-sky surface UV irradiance
Define cloud optical depth that gives the measured TOA radiance
Make cloud correction using the obtained
Absorbing aerosol correction to be added in the future
Erythemal dose rate both at overpass and at local solar noon (UV Index)
Erythemal daily dose
Irradiances at 305, 310, 324 and 380 nm both at overpass and at local solar noon
The OMI surface UV algorithm is implemented in two separate processing systems: OMI-VFD and Global OMUVB.
OMI Very-Fast-Delivery has been operational since March 2006
OMI data is received by Direct Broadcast in Sodankylä and is processed immediately after each overpass of the Aura satellite. Distribution plots for total column ozone, UV Index and Erythemal daily dose are published within 30 minutes after the overpass at
Tanskanen, A., et al. (2007), Validation of daily erythemal doses from Ozone Monitoring Instrument with ground-basedUV measurement data, J. Geophys. Res., 112, D24S44, doi:10.1029/2007JD008830.
Brewers in Jokioinen and Sodankylä
SUV100 network data by National Science Foundation
Canadian Brewer network data from Meteorological Service of Canada
Spectral UV data from Lauder and Tokyo
Arola, A., S. Kazadzis, N. Krotkov, A. Bais, J. Grobner, and J. R. Herman (2005), Assessment of TOMS UV bias due to absorbing aerosols, J. Geophys. Res., 110, D23211, doi:10.1029/2005JD005913.
Corr. coeff. = 0.76
Slope = 2.4
Relationship suggests a correction for the absorbing aerosols:
Kinne, S.: Aerosol Direct Radiative Forcing with an AERONET touch, Atmos. Environ., submitted, 2007.
Parameterization allows post-correction of the TOMS operational UV data: