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Comment on essd-2021-187

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Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Shichang Kang, Yulan Zhang, Shichang Kang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Tanguang Gao, Tanguang Gao, Tanguang Gao, Shichang Kang, Tanguang Gao, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Tanguang Gao, Tanguang Gao, Shichang Kang, Shichang Kang, Shichang Kang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Yang Li, Pengfei Chen, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Yulan Zhang, Yulan Zhang, Yulan Zhang, Shichang Kang, Yulan Zhang, Yulan Zhang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Shichang Kang, Tanguang Gao, Shichang Kang, Shichang Kang, Shichang Kang, Tanguang Gao, Shichang Kang, Shichang Kang, Shichang Kang, Tanguang Gao, Yulan Zhang, Yulan Zhang, Zhaoqing Wang, Yulan Zhang, Shichang Kang, Tanguang Gao, Tanguang Gao, Junming Guo, Shichang Kang, Tanguang Gao, Qianggong Zhang, Junming Guo, Yulan Zhang, Tanguang Gao, Shichang Kang, Tanguang Gao, Tanguang Gao, Shichang Kang, Pengfei Chen, Pengfei Chen, Zhiyuan Cong, Tanguang Gao, Junming Guo, Zhiyuan Cong, Lekhendra Tripathee, Pengfei Chen, Junming Guo, Junming Guo, Junming Guo, Pengfei Chen, S. Kaspari, Tanguang Gao, Tanguang Gao, Junming Guo, Lekhendra Tripathee, Zhaofu Hu, Zhaofu Hu, Zhaofu Hu, Zhaoqing Wang, Zhaofu Hu, Zhaofu Hu, Zhaofu Hu, Zhaofu Hu, Tanguang Gao, Yulan Zhang, Zhaofu Hu, Pengfei Chen, Hewen Niu, Xinyue Zhong, Tanguang Gao, Tanguang Gao, Tanguang Gao, Xintong Chen, Zhaofu Hu, Zhaofu Hu, Xiaofei Li, Yang Li, Bigyan Neupane, Fangping Yan, Dipesh Rupakheti, Chaman Gul, Wei Zhang, Guangming Wu, Ling Yang, Zhaoqing Wang, Chaoliu Li

Summary

This comment discusses carbonaceous aerosols including black carbon on the Tibetan Plateau (the 'Third Pole'), where plastic pollution and atmospheric particles are an emerging concern in one of Earth's most climate-sensitive regions. Better understanding of pollutant transport in this remote area is needed.

Study Type Environmental

<strong class="journal-contentHeaderColor">Abstract.</strong> The Tibetan Plateau and its surroundings, also known as the Third Pole, play an important role in the global and regional climate and hydrological cycle. Carbonaceous aerosols (CAs), including black carbon (BC) and organic carbon (OC), can directly or indirectly absorb and scatter solar radiation and change the energy balance on the Earth. CAs, along with the other atmospheric pollutants (e.g., mercury), can be frequently transported over long distances into the inland Tibetan Plateau. During the last decades, a coordinated monitoring network and research program named âAtmospheric Pollution and Cryospheric Changesâ (APCC) has been gradually set up and continuously operated within the Third Pole regions to investigate the linkage between atmospheric pollutants and cryospheric changes. This paper presents a systematic dataset of BC, OC, water-soluble organic carbon (WSOC), and water-insoluble organic carbon (WIOC) from aerosols (20 stations), glaciers (17 glaciers, including samples from surface snow and ice, snow pits, and 2 ice cores), snow cover (2 stations continuously observed and 138 locations surveyed once), precipitation (6 stations), and lake sediment cores (7 lakes) collected across the Third Pole, based on the APCC program. These data were created based on online (in situ) and laboratory measurements. High-resolution (daily scale) atmospheric-equivalent BC concentrations were obtained by using an Aethalometer (AE-33) in the Mt. Everest (Qomolangma) region, which can provide new insight into the mechanism of BC transportation over the Himalayas. Spatial distributions of BC, OC, WSOC, and WIOC from aerosols, glaciers, snow cover, and precipitation indicated different features among the different regions<span id="page684"/> of the Third Pole, which were mostly influenced by emission sources, transport pathways, and deposition processes. Historical records of BC from ice cores and lake sediment cores revealed the strength of the impacts of human activity since the Industrial Revolution. BC isotopes from glaciers and aerosols identified the relative contributions of biomass and fossil fuel combustion to BC deposition on the Third Pole. Mass absorption cross sections of BC and WSOC from aerosol, glaciers, snow cover, and precipitation samples were also provided. This updated dataset is released to the scientific communities focusing on atmospheric science, cryospheric science, hydrology, climatology, and environmental science. The related datasets are presented in the form of excel files. BC and OC datasets over the Third Pole are available to download from the National Cryosphere Desert Data Center (<a href="https://doi.org/10.12072/ncdc.NIEER.db0114.2021">https://doi.org/10.12072/ncdc.NIEER.db0114.2021</a>; Kang and Zhang, 2021).

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