当前位置: X-MOL 学术ACS Earth Space Chem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effects of Dry Deposition on Surface Ozone over South Asia Inferred from a Regional Chemical Transport Model
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-01-17 , DOI: 10.1021/acsearthspacechem.0c00004
Amit Sharma 1 , Narendra Ojha 2 , Tabish U. Ansari 3 , Som K. Sharma 2 , Andrea Pozzer 4 , Sachin S. Gunthe 1
Affiliation  

Dry deposition is a major sink for tropospheric ozone; nevertheless, studies on its effects on ozone distribution are very limited over the rapidly developing South Asian region. We performed numerical simulations using the regional model WRF-Chem (Weather Research and Forecasting Model coupled with chemistry) to investigate the effect of dry deposition on surface ozone over this region by switching dry deposition ON–OFF in the model. Dry deposition of ozone is found to reduce ozone mixing ratios by up to ∼40% over the Indo-Gangetic Plain (IGP) and parts of western and central India. Additional enhancements (by up to ∼5 ppbv) in ozone are simulated when dry deposition for all gaseous species is switched off. We find a significant contrast on the effects of dry deposition from station to station as well as on the diurnal timescales over this region. The enhancements in ozone, caused by the absence of dry deposition, are lower over urban stations during nighttime, as compared to the rural and high-altitude stations. Significant enhancements in ozone levels in the absence of dry deposition over the mostly agrarian IGP underpin the importance of dry deposition particularly in the vegetated areas. The South Asian ecosystem is seen to act as an important sink of surface ozone via the dry deposition. The analyses partially fill a gap in the studies of dry deposition over the South Asian region, where this sink is anticipated to get perturbed following the changes in land use and land cover.

中文翻译:

从区域化学迁移模型推断干沉降对南亚表面臭氧的影响

干沉降是对流层臭氧的主要吸收者;然而,在迅速发展的南亚地区,有关其对臭氧分布影响的研究非常有限。我们使用区域模型WRF-Chem(结合化学的天气研究和预报模型)进行了数值模拟,以通过在模型中打开或关闭干燥沉积来研究干燥沉积对该区域表面臭氧的影响。在印度恒河平原(IGP)以及印度西部和中部部分地区,发现臭氧的干法沉积可将臭氧混合比降低多达40%。当关闭所有气态物质的干式沉积时,会模拟臭氧的其他增强作用(最高可达5 ppbv)。我们发现,不同站点之间干沉降的影响以及该地区昼间时间尺度上存在显着差异。与农村和高海拔气象站相比,夜间由于没有干沉降而导致的臭氧增加量在城市气象站内较低。在大多数农业IGP上没有干沉降的情况下,臭氧水平的显着提高支撑了干沉降的重要性,尤其是在植被区。通过干沉降,南亚生态系统被认为是重要的表面臭氧汇。这些分析部分填补了南亚地区干燥沉积研究的空白,该地区预计会因土地利用和土地覆盖的变化而受到干扰。在大多数农业IGP上没有干沉降的情况下,臭氧水平的显着提高支撑了干沉降的重要性,尤其是在植被区。通过干沉降,南亚生态系统被认为是重要的表面臭氧汇。这些分析部分填补了南亚地区干燥沉积研究的空白,该地区预计会因土地利用和土地覆盖的变化而受到干扰。在大多数农业IGP上没有干沉降的情况下,臭氧水平的显着提高支撑了干沉降的重要性,尤其是在植被区。通过干沉降,南亚生态系统被认为是重要的表面臭氧汇。这些分析部分填补了南亚地区干燥沉积研究的空白,该地区预计会因土地利用和土地覆盖的变化而受到干扰。
更新日期:2020-01-17
down
wechat
bug