My research thus far has focused on understanding the patterns and mechanisms of climate change by using the ‘natural climate experiments of the past’ archived in lake and ocean sediments. For this, I use sediment geochemistry and geochemistry of biogenic carbonates such as, ostracod, gastropods and foraminifera. In particular, much of my research has focused on (1) Holocene Indian monsoon variability and its impact on the cultural evolution of the Bronze Age Indus Civilisation, (2) impact of Westerlies on Mediterranean climate during the late Quaternary period and, (3) South American Summer monsoon variability and associated Amazon river runoff. At EOS, I am involved in two projects: 1) developing Barium isotopes as a proxy for ocean productivity. 2) reconstructing late Quaternary climate of Southeast Asia using sediment cores from Kallang basin in Singapore. I am also collaborating with other groups at EOS for oxygen isotope stratigraphy and reconstruction of changes in the Indo-Pacific warm pool during the Quaternary period.
- 2009 - 2013 PhD in Earth Sciences St. John’s College, University of Cambridge, UK.
- 2008 - 2009 MPhil Environmental Sciences Jawaharlal Nehru University, New Delhi, India.
- 2006 - 2008 MSc Environmental Sciences Jawaharlal Nehru University, New Delhi, India.
- 2003 - 2006 BSc (Hons) Chemistry Hansraj College, Delhi University, India.
- 01/2018 - present: Research Fellow. Earth Observatory of Singapore (EOS), Nanyang Technological University, Singapore.
- 2015 - 2017. Marie Curie PRESTIGE Research fellow and LabexMER postdoctoral fellow. Marine Geosciences Research Unit, IFREMER, Brest, France.
- 2014 - 2015. Institute Postdoctoral Fellow, Department of Earth Sciences, Indian Institute of Technology Kanpur, India.
- 2013 – 2014. Postdoctoral Research Assistant, Department of Earth Sciences, University of Cambridge.
- 2007 - Indian Academy of Sciences (IAS) – Summer Research Intern, National Institute of Oceanography, Goa (India).
Intensified summer monsoon and the urbanization of Indus Civilization in northwest India. Scientific Reports. 8, (2018).
Adaptation to variable environments, resilience to climate change: investigating Land, Water and Settlement in Indus northwest India.. Current Anthropology. 58(1), 1-30. (2017).
Hydroclimatic variability on the Indian subcontinent in the past millennium: Review and assessment. Earth-Science Reviews. 161, 1-15. (2016).
Oxygen isotope analysis of multiple, single ostracod valves as a proxy for combined variability in seasonal temperature and lake water oxygen isotopes. Journal of Paleolimnology. 53, 35-45. (2015).
Abrupt weakening of the summer monsoon in northwest India ~4100 yr ago. Geology. 42, 339-342. (2014).
Abrupt weakening of the Indian summer monsoon at 8.2 kyr B.P.. Earth and Planetary Science Letters. 391, 16-23. (2014).
A climatic record from Paleolake Riwasa, Haryana, India. Manaviki. 1(2), 35-43. (2011).