Ground-based aerosol climatology of China: aerosol optical depths from the China Aerosol Remote Sensing Network (CARSNET) 2002–2013

Che, Huizheng; Xia, Xiangao; Goloub, Philippe; Holben, B. N.; Zhao, Huiling; Wang, Y.; Zhang, X.; Wang, H.; Blarel, Luc; Damiri, Bahaiddin; Zhang, Renjian; Deng, Xuejiao; Ma, Yingying; Wang, T.; Geng, Feng; Qi, Bing; Zhu, Jun; Yu, Jie; Chen, Q.; Shi, Guangyu

doi:10.5194/acpd-15-12715-2015

Cited by 38 publications

(72 citation statements)

References 87 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our AOD sensitivity values (Table 1) fall in the range of those calculated with radiative transfer models24252627. According to the observations of a ground-based aerosol remote-sensing network28, the aerosol Ångström exponent is smaller in the semi-arid northwest Chinese cities, indicating larger particle sizes, than in cities in the humid central and eastern China. The sensitivity for the semi-arid climate zone is much higher than for the humid climate zone, confirming a stronger longwave radiative forcing of coarser particles1125.…”

Section: Resultssupporting

confidence: 58%

Urban heat islands in China enhanced by haze pollution

et al. 2016

View full text Add to dashboard Cite

The urban heat island (UHI), the phenomenon of higher temperatures in urban land than the surrounding rural land, is commonly attributed to changes in biophysical properties of the land surface associated with urbanization. Here we provide evidence for a long-held hypothesis that the biogeochemical effect of urban aerosol or haze pollution is also a contributor to the UHI. Our results are based on satellite observations and urban climate model calculations. We find that a significant factor controlling the nighttime surface UHI across China is the urban–rural difference in the haze pollution level. The average haze contribution to the nighttime surface UHI is 0.7±0.3 K (mean±1 s.e.) for semi-arid cities, which is stronger than that in the humid climate due to a stronger longwave radiative forcing of coarser aerosols. Mitigation of haze pollution therefore provides a co-benefit of reducing heat stress on urban residents.

show abstract

Section: Resultssupporting

confidence: 58%

Urban heat islands in China enhanced by haze pollution

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Also, Figure e shows the effects of the GOCI AOD assimilation, and Figure f shows the direct effect of aerosols. According to the GOCI AOD, eastern China, with its high anthropogenic emissions, has elevated AODs, mainly the results of a large number of industries and vehicles (Che et al, ; Wang et al, ). A comparison between the simulated AOD from the NF experiments and the GOCI AOD data suggests that the NF significantly overestimates aerosol concentrations.…”

Section: Resultsmentioning

confidence: 99%

The Impact of the Direct Effect of Aerosols on Meteorology and Air Quality Using Aerosol Optical Depth Assimilation During the KORUS‐AQ Campaign

et al. 2019

View full text Add to dashboard Cite

To quantify the impact of the direct aerosol effect accurately, this study incorporated the Geostationary Ocean Color Imager (GOCI) aerosol optical depth (AOD) into a coupled meteorology‐chemistry model. We designed three model simulations to observe the impact of AOD assimilation and aerosol feedback during the KORUS‐AQ campaign (May–June 2016). By assimilating the GOCI AOD with high temporal and spatial resolutions, we improve the statistics from the comparison AOD and AERONET data (root‐mean‐square error: 0.12, R: 0.77, index of agreement: 0.69, mean‐absolute error: 0.08). The inclusion of the direct effect of aerosols produces the best model performance (root‐mean‐square error: 0.10, R: 0.86, index of agreement: 0.72, mean‐absolute error: 0.07). AOD values increased as much as 0.15, which is associated with an average reduction in solar radiation of ‐31.39 W/m2, a planetary boundary layer height (‐104.70 m), an air temperature (‐0.58 °C), and a surface wind speed (‐0.07 m/s) over land. In addition, concentrations of major gaseous and particulate pollutants at the surface (SO2, NO2, NH3, normalSO42−, normalNO3−, normalNH4+, and PM2.5) increase by 7.87–34%, while OH concentration decreases by ‐4.58%. Changes in meteorology and air quality appear to be more significant in high‐aerosol loading areas. The integrated process rate analysis shows decelerated vertical transport, resulting in an accumulation of air pollutants near the surface and the amount of nitrate, which is higher than that of sulfate because of its response to reduced temperature. We conclude that constraining aerosol concentrations using geostationary satellite data is a prerequisite for quantifying the impact of aerosols on meteorology and air quality.

show abstract

“…The AOD values of Nam Co and QOMS were comparable to the high‐altitude (4,500 m) site at Hanle, Northwest India (Verma et al, ), however about half of that over the lower altitude (1,650 m) mountain site at Issyk‐Kul in Kyrgyzstan (Semenov et al, ), while about a third of AOD than other mountain sites such as NCO‐P in Nepal (Gobbi et al, ) and Mt. Waliguan in Northeast TP (Che et al, ; Che, Zhang, et al, ). The remote site of the TP has about 10 times lower AOD than Lumbini (Rupakheti et al, ) and Pokhara (Xu et al, ) at Southern Himalayan foothill region, where AOD value is largely influenced by local anthropogenic emission as well as the transported aerosol from the IGP regions (Rupakheti et al, ).…”

Section: Resultsmentioning

confidence: 99%

Aerosol Properties Over Tibetan Plateau From a Decade of AERONET Measurements: Baseline, Types, and Influencing Factors

et al. 2019

Self Cite

View full text Add to dashboard Cite

In this study, a decade long measurement of aerosol optical properties at two AERONET stations (Nam Co during 2006–2016 and QOMS during 2009–2017) in the Tibetan Plateau (TP), a region sensitive to climate change and human perturbation, is presented. The baseline value of aerosol optical depth (AOD) was 0.029 and 0.027 at Nam Co and QOMS, respectively, which are comparable to or even lower than those at some Arctic and remote ocean locations. The seasonality of AOD values were the order of spring > summer > winter > autumn. Based on AOD and Ångström exponent (α), major aerosol types over the TP were further identified as continental background, biomass burning, and dust. Although continental background aerosol was the main feature in remote areas of TP, biomass burning plumes frequently occurred, especially during spring (March–April). In one of such biomass burning event in April 2014, MODIS observations demonstrated that intensive open fires occurred in South Asia, covering the foothills of Himalayas and Indo‐Gangetic Plain. The air mass back trajectories and CALIOP observations further revealed that biomass burning plume could be uplifted to higher altitudes and reach the Himalayas. Moreover, an occasional dust event detected in April 2008 over the TP demonstrated that the dust from Taklamakan Desert may impact the main body of TP episodically, although the local dust from the inside of TP cannot be excluded and warrants further study.

show abstract

Ground-based aerosol climatology of China: aerosol optical depths from the China Aerosol Remote Sensing Network (CARSNET) 2002–2013

Cited by 38 publications

References 87 publications

Urban heat islands in China enhanced by haze pollution

Urban heat islands in China enhanced by haze pollution

The Impact of the Direct Effect of Aerosols on Meteorology and Air Quality Using Aerosol Optical Depth Assimilation During the KORUS‐AQ Campaign

Aerosol Properties Over Tibetan Plateau From a Decade of AERONET Measurements: Baseline, Types, and Influencing Factors

Contact Info

Product

Resources

About