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Simultaneous assimilation of ozone profiles from multiple UV-VIS satellite instruments
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Abstract. A three-dimensional global ozone distribution has been derived from
assimilation of ozone profiles that were observed by satellites. By
simultaneous assimilation of ozone profiles retrieved from the nadir
looking satellite instruments Global Ozone Monitoring Experiment 2
(GOME-2) and Ozone Monitoring Instrument (OMI), which measure the
atmosphere at different times of the day, the quality of the derived
atmospheric ozone field has been improved. The assimilation is using
an extended Kalman filter in which chemical transport model TM5 has
been used for the forecast. The combined assimilation of both GOME-2
and OMI improves upon the assimilation results of a single
sensor. The new assimilation system has been demonstrated by
processing 4 years of data from 2008 to 2011. Validation of the
assimilation output by comparison with sondes shows that biases vary
between −5 and +10 % between the surface and
100 hPa. The biases for the combined assimilation vary
between −3 and +3 % in the region between 100 and
10 hPa where GOME-2 and OMI are most sensitive. This is
a strong improvement compared to direct retrievals of ozone profiles
from satellite observations.
Title: Simultaneous assimilation of ozone profiles from multiple UV-VIS satellite instruments
Description:
Abstract.
A three-dimensional global ozone distribution has been derived from
assimilation of ozone profiles that were observed by satellites.
By
simultaneous assimilation of ozone profiles retrieved from the nadir
looking satellite instruments Global Ozone Monitoring Experiment 2
(GOME-2) and Ozone Monitoring Instrument (OMI), which measure the
atmosphere at different times of the day, the quality of the derived
atmospheric ozone field has been improved.
The assimilation is using
an extended Kalman filter in which chemical transport model TM5 has
been used for the forecast.
The combined assimilation of both GOME-2
and OMI improves upon the assimilation results of a single
sensor.
The new assimilation system has been demonstrated by
processing 4 years of data from 2008 to 2011.
Validation of the
assimilation output by comparison with sondes shows that biases vary
between −5 and +10 % between the surface and
100 hPa.
The biases for the combined assimilation vary
between −3 and +3 % in the region between 100 and
10 hPa where GOME-2 and OMI are most sensitive.
This is
a strong improvement compared to direct retrievals of ozone profiles
from satellite observations.
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