Journal article

Simultaneous assimilation of satellite NO2, O-3, CO, and HNO3 data for the analysis of tropospheric chemical composition and emissions

Miyazaki K, Eskes H, Sudo K, Takigawa M, van Weele M, Boersma K ...see all

ATMOSPHERIC CHEMISTRY AND PHYSICS, vol. 12, issue 20 (2012) pp. 9545-9579

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We have developed an advanced chemical data assimilation system to
combine observations of chemical compounds from multiple satellites.
NO2, O-3, CO, and HNO3 measurements from the Ozone Monitoring Instrument
(OMI), Tropospheric Emission Spectrometer (TES), Measurement of
Pollution in the Troposphere (MOPITT), and Microwave Limb Sounder (MLS)
satellite instruments are assimilated into the global chemical transport
model CHASER for the years 2006-2007. The CHASER data assimilation
system (CHASER-DAS), based on the local ensemble transform Kalman filter
technique, simultaneously optimizes the chemical species, as well as the
emissions of O-3 precursors, while taking their chemical feedbacks into
account. With the available datasets, an improved description of the
chemical feedbacks can be obtained, especially related to the
NOx-CO-OH-O-3 set of chemical reactions. Comparisons against independent
satellite, aircraft, and ozonesonde data show that the data assimilation
results in substantial improvements for various chemical compounds.
These improvements include a reduced negative tropospheric NO2 column
bias (by 40-85%), a reduced negative CO bias in the Northern Hemisphere
(by 40-90%), and a reduced positive O-3 bias in the middle and upper
troposphere (from 30-40% to within 10%). These changes are related to
increased tropospheric OH concentrations by 5-15% in the tropics and
the Southern Hemisphere in July. Observing System Experiments (OSEs)
have been conducted to quantify the relative importance of each data set
on constraining the emissions and concentrations. The OSEs confirm that
the assimilation of individual data sets results in a strong influence
on both assimilated and non-assimilated species through the
inter-species error correlation and the chemical coupling described by
the model. The simultaneous adjustment of the emissions and
concentrations is a powerful approach to correcting the tropospheric
ozone budget and profile analyses.

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  • K Miyazaki

  • H J Eskes

  • K Sudo

  • M Takigawa

  • M van Weele

  • K F Boersma

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