气候变化领域集成服务门户(CCPortal): Temperature response measurements from eucalypts give insight into the impact of Australian isoprene emissions on air quality in 2050

CCPortal

DOI	10.5194/acp-20-6193-2020
	Temperature response measurements from eucalypts give insight into the impact of Australian isoprene emissions on air quality in 2050
	M. Emmerson K.; Possell M.; J. Aspinwall M.; Pfautsch S.; G. Tjoelker M.
发表日期	2020
ISSN	16807316
起始页码	6193
结束页码	6206
卷号	20 期号:10
英文摘要	Predicting future air quality in Australian cities dominated by eucalypt emissions requires an understanding of their emission potentials in a warmer climate. Here we measure the temperature response in isoprene emissions from saplings of four different Eucalyptus species grown under current and future average summertime temperature conditions. The future conditions represent a 2050 climate under Representative Concentration Pathway 8.5, with average daytime temperatures of 294.5 K. Ramping the temperature from 293 to 328K resulted in these eucalypts emitting isoprene at temperatures 4-9K higher than the default maximum emission temperature in the Model of Emissions of Gases and Aerosols from Nature (MEGAN). New basal emission rate measurements were obtained at the standard conditions of 303K leaf temperature and 1000 umolm 2 s1 photosynthetically active radiation and converted into landscape emission factors. We applied the eucalypt temperature responses and emission factors to Australian trees within MEGAN and ran the CSIRO Chemical Transport Model for three summertime campaigns in Australia. Compared to the default model, the new temperature responses resulted in less isoprene emission in the morning and more during hot afternoons, improving the statistical fit of modelled to observed ambient isoprene. Compared to current conditions, an additional 2 ppb of isoprene is predicted in 2050, causing hourly increases up to 21 ppb of ozone and 24-hourly increases of 0.4 ugm3 of aerosol in Sydney. A 550 ppmCO2 atmosphere in 2050 mitigates these peak Sydney ozone mixing ratios by 4 ppb. Nevertheless, these forecasted increases in ozone are up to one-fifth of the hourly Australian air quality limit, suggesting that anthropogenic NOx should be further reduced to maintain healthy air quality in future. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
关键词	air quality air temperature emission isoprene measurement method mixing ratio ozone photosynthetically active radiation tree Australia New South Wales Sydney [New South Wales]Eucalyptus
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132008
推荐引用方式 GB/T 7714	M. Emmerson K.,Possell M.,J. Aspinwall M.,et al. Temperature response measurements from eucalypts give insight into the impact of Australian isoprene emissions on air quality in 2050[J]. Atmospheric Chemistry and Physics,2020,20(10).
APA	M. Emmerson K.,Possell M.,J. Aspinwall M.,Pfautsch S.,&G. Tjoelker M..(2020).Temperature response measurements from eucalypts give insight into the impact of Australian isoprene emissions on air quality in 2050.,20(10).
MLA	M. Emmerson K.,et al."Temperature response measurements from eucalypts give insight into the impact of Australian isoprene emissions on air quality in 2050".20.10(2020).