First Observational Evidence That Dust‐Driven Cloud Phase Changes Cool the Surface Over Summertime Arctic Sea Ice
Abstract Cloud phase has important impacts on Arctic surface temperatures, and circumstantial evidence suggests that dust aerosols have strong regional impacts on Arctic cloud phase. We used 7 years of satellite observations and model and reanalysis products to control for co‐varying meteorology, an...
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| Format: | Article |
| Language: | English |
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Wiley
2024-10-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL110423 |
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| author | L. M. Zamora R. A. Kahn |
| author_facet | L. M. Zamora R. A. Kahn |
| author_sort | L. M. Zamora |
| collection | DOAJ |
| description | Abstract Cloud phase has important impacts on Arctic surface temperatures, and circumstantial evidence suggests that dust aerosols have strong regional impacts on Arctic cloud phase. We used 7 years of satellite observations and model and reanalysis products to control for co‐varying meteorology, and to assess how dust and other aerosols impact cloud phase and cloud radiative effects over the summertime sea ice. We focus on clouds at 3 km, where dust modeling is most accurate. There is strong indication that dust aerosols caused about 4.5% of clouds below −15°C to change phase, with smaller effects at higher temperatures. Sulfate has a smaller impact on cloud phase. Dust is associated with cloud‐mediated surface cooling of up to a 6.3 W m−2 below single‐layer clouds at ∼3 km in June. This is the first observational study to constrain likely dust‐related cloud radiative effects over the summertime Arctic sea ice. |
| format | Article |
| id | doaj-art-a363a1d324c0414ab79a7b584a2e90a5 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-a363a1d324c0414ab79a7b584a2e90a52025-08-20T03:12:52ZengWileyGeophysical Research Letters0094-82761944-80072024-10-015119n/an/a10.1029/2024GL110423First Observational Evidence That Dust‐Driven Cloud Phase Changes Cool the Surface Over Summertime Arctic Sea IceL. M. Zamora0R. A. Kahn1Earth System Science Interdisciplinary Center University of Maryland College Park MD USANASA Goddard Space Flight Center Greenbelt MD USAAbstract Cloud phase has important impacts on Arctic surface temperatures, and circumstantial evidence suggests that dust aerosols have strong regional impacts on Arctic cloud phase. We used 7 years of satellite observations and model and reanalysis products to control for co‐varying meteorology, and to assess how dust and other aerosols impact cloud phase and cloud radiative effects over the summertime sea ice. We focus on clouds at 3 km, where dust modeling is most accurate. There is strong indication that dust aerosols caused about 4.5% of clouds below −15°C to change phase, with smaller effects at higher temperatures. Sulfate has a smaller impact on cloud phase. Dust is associated with cloud‐mediated surface cooling of up to a 6.3 W m−2 below single‐layer clouds at ∼3 km in June. This is the first observational study to constrain likely dust‐related cloud radiative effects over the summertime Arctic sea ice.https://doi.org/10.1029/2024GL110423arcticaerosol‐cloud interactionscloud phasedustcloud radiative effectscloudsat |
| spellingShingle | L. M. Zamora R. A. Kahn First Observational Evidence That Dust‐Driven Cloud Phase Changes Cool the Surface Over Summertime Arctic Sea Ice Geophysical Research Letters arctic aerosol‐cloud interactions cloud phase dust cloud radiative effects cloudsat |
| title | First Observational Evidence That Dust‐Driven Cloud Phase Changes Cool the Surface Over Summertime Arctic Sea Ice |
| title_full | First Observational Evidence That Dust‐Driven Cloud Phase Changes Cool the Surface Over Summertime Arctic Sea Ice |
| title_fullStr | First Observational Evidence That Dust‐Driven Cloud Phase Changes Cool the Surface Over Summertime Arctic Sea Ice |
| title_full_unstemmed | First Observational Evidence That Dust‐Driven Cloud Phase Changes Cool the Surface Over Summertime Arctic Sea Ice |
| title_short | First Observational Evidence That Dust‐Driven Cloud Phase Changes Cool the Surface Over Summertime Arctic Sea Ice |
| title_sort | first observational evidence that dust driven cloud phase changes cool the surface over summertime arctic sea ice |
| topic | arctic aerosol‐cloud interactions cloud phase dust cloud radiative effects cloudsat |
| url | https://doi.org/10.1029/2024GL110423 |
| work_keys_str_mv | AT lmzamora firstobservationalevidencethatdustdrivencloudphasechangescoolthesurfaceoversummertimearcticseaice AT rakahn firstobservationalevidencethatdustdrivencloudphasechangescoolthesurfaceoversummertimearcticseaice |