On November 29, 2019, an aircraft observation during the period of cloud-seeding was carried out for a mixed-phase cloud over Xingtai, Hebei Province, China. This study investigates the response of mixed-phase cloud microphysical properties to cloud-seeding near cloud top. Before cloud seeding, the cloud droplet concentration from fast cloud droplet probe ( N C _ FCDP ) presented a multi-peak vertical distribution structure, with a maximum concentration of 192 cm −3 at a height of 3,322 m; the maximum concentration of ice crystals from cloud imaging probe ( N C _ CIP ) was 10 L −1 , which appeared at 4,500 m in the upper part of cloud; and the peak value of liquid water content (LWC) in the cloud also appeared at 4,500 m, with a value of 0.15 g/m 3 . The coexistence of supercooled liquid water and ice crystals implies that they are particularly suitable for cloud seeding at the height of 4,550 m. About 7–8 min later after cloud seeding at this height, the average N C _ FCDP decreased from 160.3 to 129 cm −3 , and the average N C _ CIP increased from 7.1 to 10 L −1 . Moreover, after cloud seeding, high N C _ CIP as well as larger and more ice crystals appeared almost in the same areas within the cloud, and LWC presented an obvious decreasing trend. In contrast, the concentration of small cloud droplets and LWC decreased obviously after seeding. The findings suggest that the cloud microphysical properties showed obvious responses to the artificial introduction of silver iodide, which is important for human weather modification.

Cloud seeding

Liquid water content

Cloud top

Supercooling

Cloud physics

Cloud height

Cloud fraction

10.3389/fenvs.2022.865966

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Citations (7)

Impacts of tropical cyclone-heatwave compound events on surface ozone in eastern China: Comparison between the Yangtze River and Pearl River Deltas

Cuini Qi Pinya Wang Yang Yang Huimin Li Hui Zhang

Abstract. China has implemented some air pollution management measures in recent years, yet severe ozone pollution remains a significant issue. The Southeastern Coast of China (SECC) is often influenced by hot extremes and tropical cyclones (TCs), and the two can occur simultaneously (TC-HDs). The compound TC-HDs show a rising trend in the summers of 2014–2019, potentially affecting ozone pollution. Here, we found that surface ozone concentrations over SECC are elevated during extreme hot days than the climatology. However, compared to extreme hot days alone (AHDs), the maximum 8-hour average ozone (MDA8 O3) concentration increases by an average of 6.8 μg/m3 in the Pearl River Delta (PRD) and decreases by 13.2 μg/m3 in the Yangtze River Delta (YRD) during the compound TC-HDs. The meteorological conditions during AHDs favor the chemical production of ozone over SECC, exhibiting increased temperature and solar radiation but decreased relative humidity. Relative to AHDs, strong northeasterly winds prevail in SECC during TC-HDs, suggesting the potential of ozone cross-regional transport between YRD and PRD. The process analysis in the chemical transport model (GEOS-Chem) suggests that relative to AHDs, the chemical production of ozone is enhanced in YRD during TC-HDs while horizontal transport alleviates ozone pollution in YRD but worsens it in PRD through cross-regional transport. The results highlight the significant effects of cross-regional transport in modulating ozone pollution in the two megacity clusters during hot extremes accompanied by TC activities, giving insight into future ozone control measures over SECC under global warming.

Yangtze river

10.5194/egusphere-2024-846

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Comparison of sorption kinetics of PAHs by sorptive sinks and caco-2 cell and the correlation between bioaccessibility and bioavailability of PAHs in indoor dust

The Science of The Total Environment (2018)

Yuan Kang Diya Zeng Yu Bon Man Jing Liu Yang Yang

Fluoranthene

Chrysene

10.1016/j.scitotenv.2018.07.102

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Citations (12)

Projection of heat wave in China under global warming targets of 1.5 °C and 2 °C by the ISIMIP models

Atmospheric Research (2020)

Yang Yang Chenxi Jin Shaukat Ali

Heat wave

Intensity

10.1016/j.atmosres.2020.105057

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Citations (23)

A Review of the Domestic Researches on Land Use and Land Cover Change

Geo-information Science (2008)

Yang Yang

This paper reviews the study process of the land use and land cover change and thinks that the development of the study on land use,which took land use survey as the dominant way in the early 1980s,was slow.Until the late 1980s,the study on land use developed quickly because of the development of remote sensing from experiment to actual use as well as the advantages of the geographical information system.The research of land use initiated by the International Geosphere-Biosphere Programme(IGBP) and the Human Dimensions of Global Environmental Change Programme(HDP) also promoted the development of the study.At present,the study hotpots such as technology applying trend and driving force study trend,landscape ecological research trend promote the study of many subjects in land use and land cover change.This paper also points out the problems in the land use and land cover change,such as giving emphasis on technology but neglecting theory,insufficient in microcosmic mechanism and target of the sustainable land use evaluation,ignoring substitutional study of land use, and unitary study of the service of the object.The study of land use and land cover change is conducted based on these problems mentioned above.After frontier extension,case accumulation,and technology preparation,the study on land use and land cover change should aim at these problems to strengthen the theory,grope for model and mechanism construction,extend the using frontiers,and bring the multi-subject into play.The land use and land cover change contributes to modern geography,brings geography into play,and extends a wide frontier for application in theoretical construction,math model expression,mechanism probing and so on.

Land Cover

Frontier

Land information system

Global Change

Source

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Long term exposure to air pollution and mortality in an elderly cohort in Hong Kong

Environment International (2018)

Yang Yang Robert Tang Hong Qiu PC Lai P.P. Wong

10.1016/j.envint.2018.04.034

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