Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-13559-2017 |
Aerosol trends as a potential driver of regional climate in the central United States: evidence from observations | |
Cusworth, Daniel H.1; Mickley, Loretta J.2; Leibensperger, Eric M.3; Iacono, Michael J.4 | |
2017-11-15 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:22 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | In situ surface observations show that downward surface solar radiation (SWdn) over the central and southeastern United States (US) has increased by 0.58-1.0 Wm(-2 )a(-1) over the 2000-2014 time frame, simultaneously with reductions in US aerosol optical depth (AOD) of 3.3-5.0 x 10(-3) a(-1). Establishing a link between these two trends, however, is challenging due to complex interactions between aerosols, clouds, and radiation. Here we investigate the clear-sky aerosol-radiation effects of decreasing US aerosols on SWdn and other surface variables by applying a one-dimensional radiative transfer to 2000-2014 measurements of AOD at two Surface Radiation Budget Network (SURFRAD) sites in the central and southeastern United States. Observations characterized as "clear-sky" may in fact include the effects of thin cirrus clouds, and we consider these effects by imposing satellite data from the Clouds and Earth's Radiant Energy System (CERES) into the radiative transfer model. The model predicts that 2000-2014 trends in aerosols may have driven clear-sky SWdn trends of +1.35 Wm(-2) a(-1) at Goodwin Creek, MS, and +0.93 Wm(-2) a(-1) at Bondville, IL. While these results are consistent in sign with observed trends, a cross-validated multivariate regression analysis shows that AOD reproduces 20-26 % of the seasonal (June-September, HAS) variability in clear-sky direct and diffuse SWdn at Bondville, IL, but none of the HAS variability at Goodwin Creek, MS. Using in situ soil and surface flux measurements from the Amer-iflux network and Illinois Climate Network (ICN) together with assimilated meteorology from the North American Land Data Assimilation System (NLDAS), we find that sunnier summers tend to coincide with increased surface air temperature and soil moisture deficits in the central US. The 1990-2015 trends in the NLDAS SWdn over the central US are also of a similar magnitude to our modeled 2000-2014 clear-sky trends. Taken together, these results suggest that climate and regional hydrology in the central US are sensitive to the recent reductions in aerosol concentrations. Our work has implications for severely polluted regions outside the US, where improvements in air quality due to reductions in the aerosol burden could inadvertently pose an enhanced climate risk. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000415205400003 |
WOS关键词 | ASSIMILATION SYSTEM NLDAS ; US ANTHROPOGENIC AEROSOLS ; WARMING HOLE ; RADIATION ; SCALE ; TEMPERATURE ; VARIABILITY ; ATMOSPHERE ; NETWORK ; MODEL |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/23850 |
专题 | 地球科学 |
作者单位 | 1.Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA; 2.Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA; 3.SUNY Coll Plattsburgh, Ctr Earth & Environm Sci, Plattsburgh, NY 12901 USA; 4.Atmospher & Environm Res, Lexington, MA 02421 USA |
推荐引用方式 GB/T 7714 | Cusworth, Daniel H.,Mickley, Loretta J.,Leibensperger, Eric M.,et al. Aerosol trends as a potential driver of regional climate in the central United States: evidence from observations[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(22). |
APA | Cusworth, Daniel H.,Mickley, Loretta J.,Leibensperger, Eric M.,&Iacono, Michael J..(2017).Aerosol trends as a potential driver of regional climate in the central United States: evidence from observations.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(22). |
MLA | Cusworth, Daniel H.,et al."Aerosol trends as a potential driver of regional climate in the central United States: evidence from observations".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.22(2017). |
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