Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL077692 |
Pollen Rupture and Its Impact on Precipitation in Clean Continental Conditions | |
Wozniak, M. C.1; Solmon, F.2; Steiner, A. L.1 | |
2018-07-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:14页码:7156-7164 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; France |
英文摘要 | Pollen grains emitted from vegetation can rupture, releasing subpollen particles (SPPs) as fine atmospheric particulates. Previous laboratory research demonstrates potential for SPPs as efficient cloud condensation nuclei (CCN). We develop the first model of atmospheric pollen grain rupture and implement the mechanism in regional climate model simulations over spring pollen season in the United States with a CCN-dependent moisture scheme. The source of SPPs (surface or in-atmosphere) depends on region and sometimes season, due to the distribution of relative humidity and rain. Simulated concentrations of SPPs are approximately 1-10 or 1-1,000cm(-3), depending on the number of SPPs produced per pollen grain (n(spg)). Lower n(spg) (10(3)) produces a negligible effect on precipitation, but high n(spg) (10(6)) in clean continental CCN background concentrations (100CCN per cubic centimeter) shows that SPPs suppress average seasonal precipitation by 32% and shift rates from heavy to light while increasing dry days. This effect is smaller (2% reduction) for polluted air. Plain Language Summary Pollen grains emitted by wind from a variety of plants can swell from exposure to high levels of humidity, creating internal pressure that may cause the grains to rupture. Particles that are 10 to a thousand times smaller than pollen grains are released in the process. These subpollen particles (SPPs) have been found in laboratory studies to efficiently collect water on their surfaces, making them potential cloud condensation nuclei (i.e., particles that may grow into cloud droplets). We have developed a numerical model of pollen rupture that interfaces with an atmosphere model to determine (1) how many SPPs are produced during the pollen season from two different sources: rupture of pollen at the surface and rupture of airborne pollen grains; (2) the geographic and vertical distribution of SPPs seasonally; and (3) the impact of SPPs on regional precipitation. We find that the strength of either source in any region or phase of season depends on rain and relative humidity. We also find that SPPs have the potential to suppress seasonal precipitation in clean conditions when anthropogenic pollution is not present depending on how many are released for each pollen grain that ruptures. The magnitude of suppression regionally is dependent on source magnitude of SPPs, as well as the availability of water vapor. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000442582100045 |
WOS关键词 | BET V 1 ; REGIONAL CLIMATE ; GRASS-POLLEN ; CLOUD ; AEROSOL ; MODEL ; CONDENSATION ; BIRCH ; RELEASE ; SIMULATIONS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/28275 |
专题 | 气候变化 |
作者单位 | 1.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA; 2.Observ Midi Pyrenees, Lab Aerol, Toulouse, France |
推荐引用方式 GB/T 7714 | Wozniak, M. C.,Solmon, F.,Steiner, A. L.. Pollen Rupture and Its Impact on Precipitation in Clean Continental Conditions[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(14):7156-7164. |
APA | Wozniak, M. C.,Solmon, F.,&Steiner, A. L..(2018).Pollen Rupture and Its Impact on Precipitation in Clean Continental Conditions.GEOPHYSICAL RESEARCH LETTERS,45(14),7156-7164. |
MLA | Wozniak, M. C.,et al."Pollen Rupture and Its Impact on Precipitation in Clean Continental Conditions".GEOPHYSICAL RESEARCH LETTERS 45.14(2018):7156-7164. |
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