Amending the algorithm of aerosol–radiation interactions in WRF-Chem (v4.4)
<p>WRF-Chem (Weather Research and Forecasting model coupled with Chemistry) is widely used to assess regional aerosol radiative feedback. However, in the current version, aerosol optical properties are only calculated in four shortwave bands, while only two of them are used to interpolate opti...
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Copernicus Publications
2025-02-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://gmd.copernicus.org/articles/18/585/2025/gmd-18-585-2025.pdf |
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| author | J. Feng C. Zhao C. Zhao C. Zhao C. Zhao C. Zhao C. Zhao Q. Du Z. Yang C. Jin |
| author_facet | J. Feng C. Zhao C. Zhao C. Zhao C. Zhao C. Zhao C. Zhao Q. Du Z. Yang C. Jin |
| author_sort | J. Feng |
| collection | DOAJ |
| description | <p>WRF-Chem (Weather Research and Forecasting model coupled with Chemistry) is widely used to assess regional aerosol radiative feedback. However, in the current version, aerosol optical properties are only calculated in four shortwave bands, while only two of them are used to interpolate optical properties towards the 14 shortwave bands used in the Rapid Radiative Transfer Model for Global Climate Models (RRTMG) scheme. In this study, we use a “Resolved” algorithm to estimate aerosol radiative feedback in WRF-Chem, in which aerosol optical properties are calculated in all 14 shortwave bands. The impacts of changing this calculation algorithm are then evaluated. The simulation results of aerosol optical properties are quite different using the new Resolved algorithm, especially for dust aerosols. The alteration of aerosol optical properties results in considerably different aerosol radiative effects: the dust radiative forcing in the atmosphere simulated by the Resolved algorithm is about 2 times larger than the original “Interpolated” algorithm. The dust radiative forcing at the top of the atmosphere (TOA) simulated by the Interpolated algorithm is negative in the Sahara region, while the Resolved algorithm simulates positive forcing at TOA and can exceed 10 W m<span class="inline-formula"><sup>−2</sup></span> in the Sahara, which is more consistent with previous studies. The modification also leads to changes in meteorological fields due to alterations in radiative feedback effects of aerosols. The near-surface temperature is changed due to the difference in the radiation budget at the bottom of the atmosphere (BOT) and the heating effects of aerosols at the surface. Furthermore, the amendment of the algorithm partially corrects the wind field and temperature simulation bias compared to the reanalysis data. The difference in planet boundary layer height can reach up to <span class="inline-formula">∼100</span> m in China and <span class="inline-formula">∼200</span> m in the Sahara, which also results in a greater surface haze. The results show that correcting the estimation algorithm of aerosol radiative effects is necessary in WRF-Chem.</p> |
| format | Article |
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| institution | Kabale University |
| issn | 1991-959X 1991-9603 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Copernicus Publications |
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| series | Geoscientific Model Development |
| spelling | doaj-art-c55befed364a456085474534caa76e5e2025-02-03T10:34:09ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032025-02-011858560310.5194/gmd-18-585-2025Amending the algorithm of aerosol–radiation interactions in WRF-Chem (v4.4)J. Feng0C. Zhao1C. Zhao2C. Zhao3C. Zhao4C. Zhao5C. Zhao6Q. Du7Z. Yang8C. Jin9Deep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei, ChinaDeep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei, ChinaCMA-USTC Laboratory of Fengyun Remote Sensing, University of Science and Technology of China, Hefei, ChinaState Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, ChinaInstitute of Advanced Interdisciplinary Research on High-Performance Computing Systems and Software, University of Science and Technology of China, Hefei, ChinaLaoshan Laboratory, Qingdao, ChinaCAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, ChinaDeep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei, ChinaDeep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei, ChinaDeep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China<p>WRF-Chem (Weather Research and Forecasting model coupled with Chemistry) is widely used to assess regional aerosol radiative feedback. However, in the current version, aerosol optical properties are only calculated in four shortwave bands, while only two of them are used to interpolate optical properties towards the 14 shortwave bands used in the Rapid Radiative Transfer Model for Global Climate Models (RRTMG) scheme. In this study, we use a “Resolved” algorithm to estimate aerosol radiative feedback in WRF-Chem, in which aerosol optical properties are calculated in all 14 shortwave bands. The impacts of changing this calculation algorithm are then evaluated. The simulation results of aerosol optical properties are quite different using the new Resolved algorithm, especially for dust aerosols. The alteration of aerosol optical properties results in considerably different aerosol radiative effects: the dust radiative forcing in the atmosphere simulated by the Resolved algorithm is about 2 times larger than the original “Interpolated” algorithm. The dust radiative forcing at the top of the atmosphere (TOA) simulated by the Interpolated algorithm is negative in the Sahara region, while the Resolved algorithm simulates positive forcing at TOA and can exceed 10 W m<span class="inline-formula"><sup>−2</sup></span> in the Sahara, which is more consistent with previous studies. The modification also leads to changes in meteorological fields due to alterations in radiative feedback effects of aerosols. The near-surface temperature is changed due to the difference in the radiation budget at the bottom of the atmosphere (BOT) and the heating effects of aerosols at the surface. Furthermore, the amendment of the algorithm partially corrects the wind field and temperature simulation bias compared to the reanalysis data. The difference in planet boundary layer height can reach up to <span class="inline-formula">∼100</span> m in China and <span class="inline-formula">∼200</span> m in the Sahara, which also results in a greater surface haze. The results show that correcting the estimation algorithm of aerosol radiative effects is necessary in WRF-Chem.</p>https://gmd.copernicus.org/articles/18/585/2025/gmd-18-585-2025.pdf |
| spellingShingle | J. Feng C. Zhao C. Zhao C. Zhao C. Zhao C. Zhao C. Zhao Q. Du Z. Yang C. Jin Amending the algorithm of aerosol–radiation interactions in WRF-Chem (v4.4) Geoscientific Model Development |
| title | Amending the algorithm of aerosol–radiation interactions in WRF-Chem (v4.4) |
| title_full | Amending the algorithm of aerosol–radiation interactions in WRF-Chem (v4.4) |
| title_fullStr | Amending the algorithm of aerosol–radiation interactions in WRF-Chem (v4.4) |
| title_full_unstemmed | Amending the algorithm of aerosol–radiation interactions in WRF-Chem (v4.4) |
| title_short | Amending the algorithm of aerosol–radiation interactions in WRF-Chem (v4.4) |
| title_sort | amending the algorithm of aerosol radiation interactions in wrf chem v4 4 |
| url | https://gmd.copernicus.org/articles/18/585/2025/gmd-18-585-2025.pdf |
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