Effects of implementing satellite observed aerosols into a mesoscale atmosphere model

Date

2011-01-01

Author

Bay, Emine
Yücel, İsmail
Kovacs, Tom
Mccormick, M. Patrick

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This study investigated the performance of the fifth-generation Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) Mesoscale Model (MM5) in calculating the aerosol forcing on cloud cover, incoming surface solar radiation, and near-surface air temperature via the implementation of aerosol optical depth in the shortwave radiation parameterization. MM5 simulations with and without aerosol data are performed in the periods of 6-7 August 2003 and 19-21 September 2003 during which strong aerosol forcing was observed with Moderate Resolution Imaging Spectroradiometer (MODIS) data in the mid-Atlantic region. Both periods clearly showed that aerosols had a direct negative effect on surface solar radiation through aerosol scattering. For example, every 0.1 change in MODIS aerosol optical thickness (AOT) results in 44 and 59 W m(-2) decreases in surface solar radiation for the first and second periods, respectively. A magnitude of 0.1 increment in MODIS AOT reduces air temperature 0.36 and 0.56 K for the first and second periods, respectively. Comparisons with satellite-derived surface solar radiation retrievals showed that aerosol implementation in MM5 consistently showed better incoming surface solar radiation than that of the non-aerosol case. This helps to reduce uncertainties related to the radiation-cloud-aerosol interaction in numerical weather modelling systems.

Subject Keywords

General Earth and Planetary Sciences

URI

https://hdl.handle.net/11511/37674

Journal

INTERNATIONAL JOURNAL OF REMOTE SENSING

DOI

https://doi.org/10.1080/01431161.2010.502157

Collections

Department of Civil Engineering, Article

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Citation Formats

E. Bay, İ. Yücel, T. Kovacs, and M. P. Mccormick, “Effects of implementing satellite observed aerosols into a mesoscale atmosphere model,” INTERNATIONAL JOURNAL OF REMOTE SENSING, pp. 5505–5525, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37674.