کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4439206 1311012 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of assimilated observations on improving tropospheric ozone simulations
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Impact of assimilated observations on improving tropospheric ozone simulations
چکیده انگلیسی

The work aims to evaluate the improvement in the capability of regional models to reproduce the distribution of tropospheric pollutants, using the assimilation of surface chemical observations. In particular, the efficacy in correcting the biases of perturbed emission scenarios was analysed. The study was carried out using the Air Quality Model BOLCHEM coupled with a sequential Optimal Interpolation (OI) routine to perform ozone and nitrogen dioxide assimilation. The OI routine was chosen because it is computationally inexpensive. The work was performed using the Observing System Simulation Experiment (OSSE), which allowed the quantification of assimilation impact, through comparison with a reference state. Different sensitivity tests were carried out in order to identify how assimilation can correct perturbations on O3, induced by NOx emissions biased in both flux intensity and time. This simple assimilation approach provided a substantial improvement in surface O3. It was found to be more effective to assimilate an O3 precursor, like NO2, than O3 itself, and, in order to obtain a discernible impact on 24-h forecasts, it could be sufficient to assimilate observations when NOx emissions are higher over a 12-h window. It was also found that temporally biased NOx emissions only slightly perturb O3.


► Assimilating NO2 can reduce the biases induced on O3 forecasts by biased emissions.
► Positive effect remains up to 36–40 h after the end of the assimilation.
► It is more effective to assimilate O3 precursors (like NO2) than O3 itself.
► Best result is obtained for assimilation during the photochemically active period.
► Temporally biased NOx emissions slightly perturb the O3 concentration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 45, Issue 37, December 2011, Pages 6674–6681
نویسندگان
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