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<p>We present the first implementation of the WRF-CMAQ modeling system in the Metropolitan Area of Buenos Aires (MABA). Since model configuration significantly influences simulated concentrations, sensitivity tests are essential. This study examines the influence of key factors on nitrogen dioxide (NO<sub>2</sub>) and ozone (O<sub>3</sub>) concentrations. Six experiments are conducted over one winter and one spring week combining static and dynamic initial and boundary conditions (IC/BC) by changing the number of nested domains and two ozone values in the lateral boundary profiles ([O<sub>3</sub>]<sub>b</sub>). Model behavior is assessed at the location of two monitoring stations and within the MABA domain. Results indicate that NO<sub>2</sub> and O<sub>3</sub> are sensitive to domain set up and [O<sub>3</sub>]<sub>b</sub> with the latter having a more significant effect, leading to weekly mean differences of up to 22% for NO<sub>2</sub> and 40% for O<sub>3</sub>. Sensitivity to the first model layer height (20&#xa0;m and 50&#xa0;m) is also assessed, revealing weekly mean differences up to 18% for NO<sub>2</sub> and 38% for O<sub>3</sub>, with larger impacts around peak values. These differences appear to be primarily related to atmospheric dispersion and result in both higher NO<sub>2</sub> concentrations and stronger horizontal gradients across the MABA with the lower layer. We find that the configuration with four nested domains, [O<sub>3</sub>]<sub>b</sub> = 20 ppb and a 20&#xa0;m first layer height yields acceptable results for the MABA. While longer runs are needed for a more robust performance assessment, our initial results suggest an acceptable behavior of CMAQ in this modeling domain.</p>

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Sensitivity analysis of NO2 and O3 concentrations modeled with WRF-CMAQ to boundary and initial conditions and first model layer height in the Metropolitan Area of Buenos Aires, Argentina

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Solange Luque,
  • Andrea L. Pineda Rojas,
  • Lluís Fita,
  • Rafael Borge

摘要

We present the first implementation of the WRF-CMAQ modeling system in the Metropolitan Area of Buenos Aires (MABA). Since model configuration significantly influences simulated concentrations, sensitivity tests are essential. This study examines the influence of key factors on nitrogen dioxide (NO2) and ozone (O3) concentrations. Six experiments are conducted over one winter and one spring week combining static and dynamic initial and boundary conditions (IC/BC) by changing the number of nested domains and two ozone values in the lateral boundary profiles ([O3]b). Model behavior is assessed at the location of two monitoring stations and within the MABA domain. Results indicate that NO2 and O3 are sensitive to domain set up and [O3]b with the latter having a more significant effect, leading to weekly mean differences of up to 22% for NO2 and 40% for O3. Sensitivity to the first model layer height (20 m and 50 m) is also assessed, revealing weekly mean differences up to 18% for NO2 and 38% for O3, with larger impacts around peak values. These differences appear to be primarily related to atmospheric dispersion and result in both higher NO2 concentrations and stronger horizontal gradients across the MABA with the lower layer. We find that the configuration with four nested domains, [O3]b = 20 ppb and a 20 m first layer height yields acceptable results for the MABA. While longer runs are needed for a more robust performance assessment, our initial results suggest an acceptable behavior of CMAQ in this modeling domain.