Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A WRF–CMAQ study on spring time vertical ozone structure in Southeast Texas
https://orcid.org/0000-0002-8314-4020
Abstract A WRF–SMOKE–CMAQ modeling system was used to simulate vertical profiles of ozone, temperature and wind as well as surface ozone and meteorology during the Study of Houston Atmospheric Radical Precursors (SHARP) in May 2009. WRF and CMAQ sensitivity studies were conducted to define a proper combination of model configurations. With objective analysis WRF showed considerable skills in simulating temperature and wind profiles. CMAQ did well in replicating daily regional average ozone, with only minor overprediction for most of the days. According to the surface ozone statistics and the ozone biases along the vertical profiles, the model displayed little sensitivity to the two CMAQ model options: (i) fixed night time PBL height vs. WRF calculated night time PBL heights, and (ii) the combination of the Euler-backward iterative chemistry schemes and Yamartino advection (EBI/YAMO) vs. the Sparse-Matrix Vectorized Gear chemistry and Parabolic Method advection (SMV-GEAR/PPM) schemes. CMAQ shows substantial underprediction of ozone in the upper troposphere, but demonstrated fair skills in reproducing the ozone profile in the lower to middle troposphere, with typically a few ppb negative biases which tend to increase with height. However, the model usually cannot reproduce high variability in the ozone profiles due to the fixed default profiles and lack of data assimilation capability. While the default CMAQ static profile setup for boundary condition (BC) does not properly reflect the actual dynamic atmosphere, it remains a reasonable choice, since using downscaled real-time global chemistry model BCs demands considerable efforts and would still depend on the performance of the global model.
Highlights Vertical profiles of ozone, temperature and wind simulated with WRF–SMOKE-CMAQ. Considerable skills in simulating temperature and wind profiles. Substantial underprediction of ozone in the upper troposphere. Fair skills in reproducing the ozone profile in the lower to middle troposphere. Model problems due to fixed default O3 profiles and data assimilation capability.
A WRF–CMAQ study on spring time vertical ozone structure in Southeast Texas
https://orcid.org/0000-0002-8314-4020
Abstract A WRF–SMOKE–CMAQ modeling system was used to simulate vertical profiles of ozone, temperature and wind as well as surface ozone and meteorology during the Study of Houston Atmospheric Radical Precursors (SHARP) in May 2009. WRF and CMAQ sensitivity studies were conducted to define a proper combination of model configurations. With objective analysis WRF showed considerable skills in simulating temperature and wind profiles. CMAQ did well in replicating daily regional average ozone, with only minor overprediction for most of the days. According to the surface ozone statistics and the ozone biases along the vertical profiles, the model displayed little sensitivity to the two CMAQ model options: (i) fixed night time PBL height vs. WRF calculated night time PBL heights, and (ii) the combination of the Euler-backward iterative chemistry schemes and Yamartino advection (EBI/YAMO) vs. the Sparse-Matrix Vectorized Gear chemistry and Parabolic Method advection (SMV-GEAR/PPM) schemes. CMAQ shows substantial underprediction of ozone in the upper troposphere, but demonstrated fair skills in reproducing the ozone profile in the lower to middle troposphere, with typically a few ppb negative biases which tend to increase with height. However, the model usually cannot reproduce high variability in the ozone profiles due to the fixed default profiles and lack of data assimilation capability. While the default CMAQ static profile setup for boundary condition (BC) does not properly reflect the actual dynamic atmosphere, it remains a reasonable choice, since using downscaled real-time global chemistry model BCs demands considerable efforts and would still depend on the performance of the global model.
Highlights Vertical profiles of ozone, temperature and wind simulated with WRF–SMOKE-CMAQ. Considerable skills in simulating temperature and wind profiles. Substantial underprediction of ozone in the upper troposphere. Fair skills in reproducing the ozone profile in the lower to middle troposphere. Model problems due to fixed default O3 profiles and data assimilation capability.
A WRF–CMAQ study on spring time vertical ozone structure in Southeast Texas
https://orcid.org/0000-0002-8314-4020
Abstract A WRF–SMOKE–CMAQ modeling system was used to simulate vertical profiles of ozone, temperature and wind as well as surface ozone and meteorology during the Study of Houston Atmospheric Radical Precursors (SHARP) in May 2009. WRF and CMAQ sensitivity studies were conducted to define a proper combination of model configurations. With objective analysis WRF showed considerable skills in simulating temperature and wind profiles. CMAQ did well in replicating daily regional average ozone, with only minor overprediction for most of the days. According to the surface ozone statistics and the ozone biases along the vertical profiles, the model displayed little sensitivity to the two CMAQ model options: (i) fixed night time PBL height vs. WRF calculated night time PBL heights, and (ii) the combination of the Euler-backward iterative chemistry schemes and Yamartino advection (EBI/YAMO) vs. the Sparse-Matrix Vectorized Gear chemistry and Parabolic Method advection (SMV-GEAR/PPM) schemes. CMAQ shows substantial underprediction of ozone in the upper troposphere, but demonstrated fair skills in reproducing the ozone profile in the lower to middle troposphere, with typically a few ppb negative biases which tend to increase with height. However, the model usually cannot reproduce high variability in the ozone profiles due to the fixed default profiles and lack of data assimilation capability. While the default CMAQ static profile setup for boundary condition (BC) does not properly reflect the actual dynamic atmosphere, it remains a reasonable choice, since using downscaled real-time global chemistry model BCs demands considerable efforts and would still depend on the performance of the global model.
Highlights Vertical profiles of ozone, temperature and wind simulated with WRF–SMOKE-CMAQ. Considerable skills in simulating temperature and wind profiles. Substantial underprediction of ozone in the upper troposphere. Fair skills in reproducing the ozone profile in the lower to middle troposphere. Model problems due to fixed default O3 profiles and data assimilation capability.
A WRF–CMAQ study on spring time vertical ozone structure in Southeast Texas
Li, Xiangshang (Autor:in) / Rappenglück, Bernhard (Autor:in)
Atmospheric Environment ; 97 ; 363-385
15.08.2014
23 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
WRF , CMAQ , Radiosondes , Ozonesondes , Houston
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