edu.ucar.opensky::articles:11673 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T04:06:00.672117 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d79w0g31 Observation and modeling of the evolution of Texas power plant plumes 2012-01-09T00:00:00Z publication https://n2t.org/ark:/85065/d79w0g31 https://doi.org/10.5194/acp-12-455-2012 Zhou, W. author Cohan, D. author Pinder, R. author Neuman, J. author Holloway, J. author Peischl, J. author Ryerson, T. author Nowak, J. author Flocke, Frank M. author Zheng, Wengang author UCAR/NCAR - Library publisher During the second Texas Air Quality Study 2006 (TexAQS II), a full range of pollutants was measured by aircraft in eastern Texas during successive transects of power plant plumes (PPPs). A regional photochemical model is applied to simulate the physical and chemical evolution of the plumes. The observations reveal that SO₂ and NOy were rapidly removed from PPPs on a cloudy day but not on the cloud-free days, indicating efficient aqueous processing of these compounds in clouds. The model reasonably represents observed NOx oxidation and PAN formation in the plumes, but fails to capture the rapid loss of SO₂ (0.37 h⁻¹) and NOy (0.24 h⁻¹) in some plumes on the cloudy day. Adjustments to the cloud liquid water content (QC) and the default metal concentrations in the cloud module could explain some of the SO₂ loss. However, NOy in the model was insensitive to QC. These findings highlight cloud processing as a major challenge to atmospheric models. Model-based estimates of ozone production efficiency (OPE) in PPPs are 20-50% lower than observation-based estimates for the cloudy day. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. None eng geoscientificInformation