Sanjeev Dasari

Recently graduated
Room: R501
Phone: +46 86747759
Sanjeev.Dasari@aces.su.se

About me:

I have a Master’s in Environmental Sciences and Engineering from EPFL, Switzerland. My current research is inspired by my previous research experiences at ETH Zurich, Cambridge University, and Oxford University.

I am interested in the molecular and isotopic investigation of the physicochemical properties, light-absorption characteristics, sources of carbonaceous aerosols and trace gases in the Atmospheric Brown Clouds (ABCs).

About my doctoral research topic:

Addressing the model-observation offset in absorption aerosol optical depth over South Asia: characterization of aerosol optical properties, sources, and emission fluxes

Large emissions of black carbon (BC) and brown carbon (BrC) aerosols, and carbon monoxide (CO) in the densely populated South Asia affect the quality of the regional air and the climate. However, these 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 source fractions/loadings of these species. 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 geochemical (δ13C/Δ14C of BrC, BC and  δ13C/δ18O of CO) and optical techniques will be employed in order to address (i) optical properties and bleaching of ambient BrC; (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 Phase I, Phase II) between Jan-Mar 2016, 2018, 2019 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 campaigns. 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

Source quantification of South Asian black carbon aerosols with isotopes and modeling

Sanjeev Dasari; August Andersson; Andreas Stohl; Nikolaos Evangeliou; Srinivas Bikkina; Henry Holmstrand; Krishnakant Budhavant; Abdus Salam; Örjan Gustafsson;
2020 | Environ. Sci. Technol.

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.