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Effects of terracing measures on water retention of pinus Tabulaeformis forest in the dryland loess hilly region of China
Wei, Wei; Pan, Daili; Yang, Yong
2021-12-15
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
ISSN1680-7316
Volume21Issue:23Pages:17885-17906
AbstractAtmospheric new particle formation (NPF) events have attracted increasing attention for their contribution to the global aerosol number budget and therefore their effects on climate, air quality and human health. NPF events are regarded as a regional phenomenon, occurring over a large area. Most observations of NPF events in Beijing and its vicinity were conducted in populated areas, whereas observations of NPF events on mountaintops with low anthropogenic emissions are still rare in China. The spatial variation of NPF event intensity has not been investigated in detail by incorporating both urban areas and mountain measurements in Beijing. Here, we provide NPF event characteristics in summer 2018 and 2019 at urban Beijing and a comparison of NPF event characteristics - NPF event frequency, formation rate and growth rate - by comparing an urban Beijing site and a background mountain site separated by similar to 80 km from 14 June to 14 July 2019, as well as giving insights into the connection between both locations. During parallel measurements at urban Beijing and mountain background areas, although the median condensation sink during the first 2 h of the common NPF events was around 0.015(-1) at both sites, there were notable differences in formation rates between the two locations (median of 5.42 cm(-3) s(-1) at the urban site and 1.13 cm(-3) s(-1) at the mountain site during the first 2 h of common NPF events). In addition, the growth rates in the 7-15 nm range for common NPF events at the urban site (median of 7.6 nm h(-1)) were slightly higher than those at the mountain site (median of 6.5 nm h(-1)). To understand whether the observed events were connected, we compared air mass trajectories as well as meteorological conditions at both stations. Favorable conditions for the occurrence of regional NPF events were largely affected by air mass transport. Overall, our results demonstrate a clear inhomogeneity of regional NPF within a distance of similar to 100 km, possibly due to the discretely distributed emission sources.
Department城市与区域生态国家重点实验室
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46725
Collection城市与区域生态国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Natl Observat & Res Stn Earth Crit Zone & Terr Su, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Wei, Wei,Pan, Daili,Yang, Yong. Effects of terracing measures on water retention of pinus Tabulaeformis forest in the dryland loess hilly region of China[J]. AGRICULTURAL AND FOREST METEOROLOGY,2021,21(23):17885-17906.
APA Wei, Wei,Pan, Daili,&Yang, Yong.(2021).Effects of terracing measures on water retention of pinus Tabulaeformis forest in the dryland loess hilly region of China.AGRICULTURAL AND FOREST METEOROLOGY,21(23),17885-17906.
MLA Wei, Wei,et al."Effects of terracing measures on water retention of pinus Tabulaeformis forest in the dryland loess hilly region of China".AGRICULTURAL AND FOREST METEOROLOGY 21.23(2021):17885-17906.
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