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| DOI | 10.5194/acp-19-10919-2019 |
| Aerosol radiative effects with MACv2 | |
| Kinne S. | |
| 发表日期 | 2019 |
| ISSN | 16807316 |
| 起始页码 | 10919 |
| 结束页码 | 10959 |
| 卷号 | 19期号:16 |
| 英文摘要 | Monthly global maps for aerosol properties of the Max Planck Aerosol Climatology version 2 (MACv2) are applied in an offline radiative transfer model to determine aerosol radiative effects. This model setup cannot address rapid adjustments by clouds, but current evidence suggests their contribution to be small when compared to the instantaneous radiative forcing. Global maps are presented to detail the regional and seasonal variability associated with (annual) global averages. Radiative effects caused by the aerosol presence (direct effects) and by aerosol modified clouds (indirect effects) are examined. Direct effects are determined for total aerosol, anthropogenic aerosol and extracted individual aerosol components. Indirect effects cover the impact of reduced cloud drop sizes by anthropogenic aerosol. Present-day global annual radiative effects for anthropogenic aerosol yield (1) a climate cooling of -1:0Wm-2 at the top of the atmosphere (TOA); (2) a surface net-flux reduction of -2:1Wm-2; and, by difference; (3) an atmospheric effect of C1.1Wm-2. This atmospheric solar heating is almost entirely a direct effect. On a global basis, indirect effects (-0:65Wm-2) dominate direct effects (-0:35Wm-2) for the present-day climate response at the TOA, whereas the present-day surface radiative budget is more strongly reduced by direct effects (-1:45Wm-2) than by indirect effects (-0:65Wm-2). Natural aerosols are on average less absorbing and larger in size. However, their stronger solar TOA cooling efficiency is offset by a non-negligible infrared (IR) greenhouse warming efficiency. In the sum the global average annual direct forcing efficiencies (per unit AOD) for natural and anthropogenic aerosol are similar: -12Wm-2 per unit AOD for all-sky conditions and -24Wm-2 per unit AOD for clearsky conditions. The present-day direct TOA impact by all soot (BC) is C0:55Wm-2, when globally and annually averaged. Between C0:25 and C0:45Wm-2 of that can be attributed to anthropogenic sources, depending on assumptions for the preindustrial BC reference state. Similarly, the preindustrial fine-mode reference uncertainty has a strong influence not just on the direct effect but even more on the indirect effect. Present-day aerosol TOA forcing is estimated to stay within the -0:7 to -1:6Wm-2 range (with the best estimate at -1:0Wm-2). Calculations with scaled temporal changes to anthropogenic AOD from global modeling indicate that the global annual aerosol forcing has not changed much over the last decades, despite strong shifts in regional maxima for anthropogenic AOD. These regional shifts explain most solar insolation (brightening or dimming) trends that have been observed by ground-based radiation data. © Author(s) 2019. |
| 语种 | 英语 |
| scopus关键词 | aerosol property; cooling; heating; mapping; radiative forcing; radiative transfer; seasonal variation; top of atmosphere |
| 来源期刊 | Atmospheric Chemistry and Physics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/144183 |
| 作者单位 | Max Planck Institute for Meteorology, Hamburg, Germany |
| 推荐引用方式 GB/T 7714 | Kinne S.. Aerosol radiative effects with MACv2[J],2019,19(16). |
| APA | Kinne S..(2019).Aerosol radiative effects with MACv2.Atmospheric Chemistry and Physics,19(16). |
| MLA | Kinne S.."Aerosol radiative effects with MACv2".Atmospheric Chemistry and Physics 19.16(2019). |
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