Sanjeev Dasari

PhD student
Room: R501
Phone: +46 86747759
Sanjeev.Dasari@aces.su.se

I have a Master's in Environmental Sciences and Engineering from EPFL, Switzerland. I believe my current research is inspired by my previous research experiences at ETH Zurich, Cambridge University, Oxford University and the National University of Singapore. My interests include investigating the atmospheric chemistry of carbonaceous aerosols, exploring the coupling of trace gases and aerosols.

Black Carbon aerosols over South Asia: top-down characterization of sources and properties

Large emissions of black carbon (BC) aerosols in densely populated South Asia affect the quality of the regional air and the climate. However, these health and climate effects are associated with large uncertainties, as illustrated by a factor 2-3 offset between top-down observations and bottom-up model predictions of both BC sources/loadings and the direct climate effects. My thesis aims to contribute to reducing this model-observation gap. To this end, observational studies in source and receptor location in S Asia using a combination of isotopic geo-chemical (δ13C/Δ14C of WSOC, BC and  δ13C/δ18O of CO) and optical techniques will be employed in order to address (i) optical properties of ambient light-absorbing aerosols- Brown Carbon; (ii) Uncertainties in BC source apportionment ; (iii) Estimation of BC source fluxes using inverse-modeling of BC/CO ratio from isotopically constrained CO fractions. I took an active take in the South Asian Pollution Experiment (SAPOEX-16, SAPOEX-18) between Jan-Mar 2016, 2018, a series of field campaigns in the Maldives at MCOH observatory as well as BCOB observatory in Bangladesh along with various international collaborators. We made a multitude of high resolution online and filter based atmospheric measurements during these field campaign. A major chunk of this would be analyzed during the course of my PhD work.

My work on the “Bleaching of Brown Carbon in the South Asian outflow ” was covered by press and media:

Latest scientific papers

Photochemical degradation affects the light absorption of water-soluble brown carbon in the South Asian outflow

Sanjeev Dasari; August Andersson; Srinivas Bikkina; Henry Holmstrand; Krishnakant Budhavant; Sreedharan Satheesh; Eija Asmi; Jutta Kesti; John Backman; Abdus Salam; Deewan Singh Bisht; Suresh Tiwari; Zahid Hameed; Örjan Gustafsson;
2019 | Sci. Adv. | 5, no. 1, eaau8066

All publications

Biogeochemistry

How human activities affect natural processes that drive the major biogeochemical cycles that ultimately govern the composition of the environment.