Academic Journal
California wildfire smoke contributes to a positive atmospheric temperature anomaly over the western United States
| العنوان: | California wildfire smoke contributes to a positive atmospheric temperature anomaly over the western United States |
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| المؤلفون: | J. L. Gomez, R. J. Allen, K.-F. Li |
| المصدر: | Atmospheric Chemistry and Physics, Vol 24, Pp 6937-6963 (2024) |
| بيانات النشر: | Copernicus Publications |
| سنة النشر: | 2024 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | Physics, QC1-999, Chemistry, QD1-999 |
| الوصف: | Wildfires in the southwestern United States, particularly in northern California (nCA), have grown in size and severity in the past decade. As they have grown larger, they have been associated with large emissions of absorbing aerosols and heat into the troposphere. Utilizing satellite observations from MODIS, CERES, and AIRS as well as reanalysis from MERRA-2, the meteorology associated with fires during the wildfire season (June–October) was discerned over the nCA-NV (northern California and Nevada) region during the period 2003–2022. Wildfires in the region have a higher probability of occurring on days of positive temperature ( T ) anomalies and negative relative humidity (RH) anomalies, making it difficult to discern the radiative effects of aerosols that are concurrent with fires. To attempt to better isolate the effects of large fire emissions on meteorological variables, such as clouds and precipitation, variable anomalies on high fire emission days (90th percentile) were compared with low fire emission days (10th percentile) and were further stratified based on whether surface relative humidity (RH s ) was anomalously high (75th percentile) or low (25th percentile) compared with typical fire season conditions. Comparing the simultaneously high fire emission and high RH s data with the simultaneously low fire emission and high RH s data, positive tropospheric T anomalies were found to be concurrent with positive AOD anomalies. Further investigation found that due to shortwave absorption, the aerosols heat the atmosphere at a rate of 0.041 ± 0.016 to 0.093 ± 0.019 K d −1 , depending on whether RH conditions are anomalously positive or negative. The positive T anomalies were associated with significant negative 850–300 hPa RH anomalies during both 75th percentile RH s conditions. Furthermore, high fire emission days under high RH s conditions are associated with negative CF anomalies that are concurrent with the negative RH anomalies. This negative CF anomaly is associated with a significantly negative ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 1680-7316 1680-7324 |
| Relation: | https://acp.copernicus.org/articles/24/6937/2024/acp-24-6937-2024.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324; https://doaj.org/article/f75f3f67c5554a1c9f75657eba7b7837 |
| DOI: | 10.5194/acp-24-6937-2024 |
| الاتاحة: | https://doi.org/10.5194/acp-24-6937-2024 https://doaj.org/article/f75f3f67c5554a1c9f75657eba7b7837 |
| رقم الانضمام: | edsbas.FB1503C9 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 16807316 16807324 |
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| DOI: | 10.5194/acp-24-6937-2024 |