GEOGRAPHY

In the second Qinghai-Tibet scientific expedition, the Landa team clarified the effect of aerosol radiation


The Qinghai-Tibet Plateau atmospheric dust aerosol research team of Lanzhou University carried out comprehensive scientific investigation of dust aerosols in 2020 and 2021 at Yadong Station and Everest Base Camp Station in the Himalayan region respectively, obtained first-hand observation data, and gained new understanding of the aerosol radiation effect in the Himalayan region.

The Qinghai-Tibet Plateau atmospheric dust aerosol expedition team of Lanzhou University carried out comprehensive scientific investigations on atmospheric dust aerosols from June 11 to August 31, 2020 and at Yadong Station and Everest Base Camp Station from June 11 to August 31, 2020 and May 20 to June 13, 2021, respectively. Photo courtesy of the research group

The related research results are entitled “The Radiation Effect of Aerosol Aerosols in the Himalayan Region by Changing the Albedo of Single Scattering by Changing the Albedo of Single Scattering”, which was recently published in the journal Climate and Atmospheric Science, a journal of Nature.

Light scattering and absorption of atmospheric aerosols produce important radiative effects on the geo-atmospheric system through aerosol-radiation and aerosol-cloud interactions. The single-scatter albedo (the ratio of scattering to scattering and absorption) of an aerosol not only affects the magnitude of radiative forcing, but may also determine the heating or cooling effect of the aerosol on the top of the atmosphere. The Himalayan region is an important channel for the transport of anthropogenic pollutants from South Asia to the Qinghai-Tibet Plateau. Anthropogenic emissions of highly absorbent aerosols such as black carbon in South Asia lead to low single-scatter albedo in South Asia and the Himalayas. Previous observational and numerical simulation studies in the Himalayas and South Asia only used aerosol absorption to explain the change of single-scattered albedo, and the results and conclusions were contradictory and erroneous, which brought great uncertainty to the assessment of aerosol radiation effects in this region.

The research team of atmospheric dust aerosol research on the Qinghai-Tibet Plateau found that the particle size spectrum distribution of aerosols in the Himalayan region determines the scattering efficiency of aerosols, thereby determining the change of single-scatter albedo, which in turn affects the direct radiative forcing efficiency of aerosols. Therefore, the particle size spectral distribution of atmospheric aerosols affects the radiation effect of aerosols in Himalayan regions by adjusting the albedo of single scattering. This new understanding will have important implications for understanding the radiation effects of aerosols on a global scale.

It is reported that the first author of the paper is Tian Pengfei, a young researcher at the School of Atmospheric Sciences of Lanzhou University, and the corresponding authors are Huang Jianping, academician of the Chinese Academy of Sciences and professor of Lanzhou University, and Zhang Lei, professor of Lanzhou University. (Source: China Science News, Wen Caifei, Faisha)

Related paper information:https://doi.org/10.1038/s41612-023-00368-5



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