Research Expertise:
Carbon and Sulfur isotope systematics of aerosols and trace gases in modern and paleo-atmosphere
Short Bio:
Sanjeev is a researcher studying greenhouse gas release from Canadian Arctic river systems. He will employ state-of-the art instrumentation to study the greenhouse gas fluxes and use multiple-isotope probing techniques to study their age and sources. Prior to joining our department at Oxford University, he studied Environmental Science and Engineering at the École Polytechnique Fédérale de Lausanne, EPFL in Switzerland (MSc; 2012-2014), and completed a doctoral thesis at the Department of Environmental Science at Stockholm University, Sweden (PhD; 2016-2021). His doctoral thesis looked at isotope-based constraints on sources and processing of carbonaceous aerosols and by-products in polluted environments.
Upon earning his doctorate degree, Sanjeev secured the prestigious Marie-Skłodowska–Curie fellowship and conducted postdoctoral research (2021-2023) at the Institut des Géosciences de l’Environnement (IGE-CNRS) in France. At IGE, he investigated ozone layer depletion events in the ‘past’ using Antarctic and Greenland ice cores. His work has led to novel proxy development using sulfur isotopes and the aspect of mass-independent fractionation (S-MIF), and allowed for understanding of the changes in the tropospheric chemistry during timescale of ~41k BP (i.e., the Laschamp geomagnetic excursion event). During his postdoctoral research, Sanjeev also explored the role of S-MIF in ‘modern’ atmospheric aerosols and contributed towards answering some of the long-standing questions in the field of S-isotope geochemsitry.
Besides these experiences, he has secured several accolades including various fellowships and prizes in over five different countries internationally.
Both doctoral and postdoctoral research works of Sanjeev have been covered in press and media:
2022: Antarctic ice cores reveal ozone layer depletion events in the past
2019: Role of atmospheric brown carbon in wintertime S Asia
View Selected Publications
- Dasari, S., Garnett, M. and Hilton, R.G., 2024. Leakage of old carbon dioxide from a major river system in the Canadian Arctic. PNAS nexus.
- Dasari, S. and Widory, D., 2024. Retrospective Isotopic Analysis of Summertime Urban Atmospheric Sulfate in South Asia Using Improved Source Constraints. ACS ES&T Air.
- Dasari, S., Paris, G., Pei, Q., Cong, Z. and Widory, D., 2023. Tracing the origin of elevated springtime atmospheric sulfate on the southern Himalayan-Tibetan plateau. Environmental Science: Advances.
- Dasari, S., Paris, G., Charreau, J. and Savarino, J., 2022. Sulfur-isotope anomalies recorded in Antarctic ice cores as a potential proxy for tracing past ozone layer depletion events. PNAS nexus.
- Dasari, S., Paris, G., Saar, B., Pei, Q., Cong, Z. and Widory, D., 2022. Sulfur isotope anomalies (Δ33S) in urban air pollution linked to mineral-dust-associated sulfate. ES&T Letters.
- Dasari, S. and Widory, D., 2022. Radiocarbon (14C) Analysis of Carbonaceous Aerosols: Revisiting the Existing Analytical Techniques for Isolation of Black Carbon. Frontiers in Environmental Science.
- Dasari, S., Andersson, A., Popa, M.E., Rockmann, T., Holmstrand, H., Budhavant, K. and Gustafsson, O., 2021. Observational evidence of large contribution from primary sources for carbon monoxide in the South Asian outflow. ES&T.
- Dasari, S., Andersson, A., Stohl, A., Evangeliou, N., Bikkina, S., Holmstrand, H., Budhavant, K., Salam, A. and Gustafsson, O., 2020. Source quantification of South Asian black carbon aerosols with isotopes and modeling. ES&T.
- Dasari, S., Andersson, A., Bikkina, S., Holmstrand, H., Budhavant, K., Satheesh, S., Asmi, E., Kesti, J., Backman, J., Salam, A. and Bisht, D.S., 2019. Photochemical degradation affects the light absorption of water-soluble brown carbon in the South Asian outflow. Science advances.
View Extended Publications
- Chaillot, J., Dasari, S., Fleurbaey, H., Daeron, M., Savarino, J. and Kassi, S., 2023. High-precision laser spectroscopy of H 2 S for simultaneous probing of multiple-sulfur isotopes. Environmental Science: Advances.
- Papazian, S., D’Agostino, L.A., Sadiktsis, I., Froment, J., Bonnefille, B., Sdougkou, K., Xie, H., Athanassiadis, I., Budhavant, K., Dasari, S. and Andersson, A., 2022. Nontarget mass spectrometry and in silico molecular characterization of air pollution from the Indian subcontinent. Communications Earth & Environment.
- Kesti, J., Asmi, E., O’Connor, E.J., Backman, J., Budhavant, K., Andersson, A., Dasari, S., Praveen, P.S., Zahid, H. and Gustafsson, Ö., 2020. Changes in aerosol size distributions over the Indian Ocean during different meteorological conditions. Tellus B: Chemical and Physical Meteorology .