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OU23 - Reconstructing vegetation and fire history in response to past changes in the Indian Monsoon


School of Environment, Earth & Ecosystem Sciences

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Dr P Anand No more applications being accepted Funded PhD Project (UK Students Only)

About the Project

The Indian Monsoon, a subsystem of the Asian Monsoon, is one of the best examples of coupling between solid Earth and atmospheric processes. Climate and vegetation are known to be interlinked but how vegetation impacts climate, and vice versa, is poorly constrained. A shift from C3 to C4 biomes in response to the development of the seasonal summer monsoon precipitation in the beginning of the late Pliocene has been observed in Australia [1], which is asynchronous with observations from Asia, Africa and Americas. Records from the Indian Monsoon region indicate precipitation and vegetation linkages during the late Miocene [2] and Pleistocene glacial-interglacial intervals [3], however, orbital controls on vegetation, aridity and rainfall in the Pliocene have not been investigated. Our ongoing work indicates a general increase in Indian Summer Monsoon strength linked to intensification of Northern Hemisphere Glaciation (iNHG), as well as long term evolution since 10 Ma, at Integrated Ocean Discovery Programme expedition 353 Sites, which are yet to be coupled with vegetation and fire history for the early–mid Pliocene. This project, therefore, will apply multi-proxy methods to reconstruct vegetation, aridity and seasonality of monsoon runoff on a variety of time scales (500 yr – sub-millennial, 2 kyr – sub-orbital, or 100 kyr – sub-tectonic) from the core Indian Monsoon region of the Bay of Bengal. These records will address the key question: how were vegetation, aridity and Indian Monsoon (summer and winter) strength linked? What is the response of vegetation to changing Monsoon precipitation? How are Indian Summer Monsoon vegetation dynamics linked to the other Asian and global Monsoon regions? New records generated in this project will be compared with published contemporaneous terrestrial records to identify the nature of the linkage between the Indian, Asian and global Monsoons.

Methodology

The method will include processing of ocean sediments to extract pollen, dinocysts and charcoal. These samples will be processed following method established at the OU [4]. We will obtain data on pollen and spore assemblages and assessment of microscopic and macroscopic charcoal. These data will be used to determine patterns in both terrestrial vegetation and local marine conditions (dinocysts). Pollen work will also inform vegetation changes that will provide useful information on our ongoing work on organic geochemical proxies (δDwax) from the same sample, which is part of other ongoing projects.

Training and skills

The student will receive specific training on pollen and charcoal preparation at the Open University by Dr Mander and Dr Kulkarni. This project will benefit from an ongoing collaboration with regional pollen expert (Dr Quamar) and will primarily utilise continuous sedimentary successions from the early–mid Pliocene of IODP Expedition 353 (Sites U1445, U1447/48 and U1444). The student will receive a diverse set of training courses offered by the OU throughout their PhD.

Specific skills that will be acquired during this project include:

  • Cutting edge geochemical techniques
  • Data handling and interpretation from a wide variety of sources
  • Scientific communication through writing, poster and oral presentations to academic and nonacademic audiences
  • Co-supervision on your own devised OU’s master’s project and teaching research methods to A level Nuffield funded summer students.

Partners and collaboration

This project will benefit from international collaborations and networking opportunities with IODP 353 expedition scientists. In particular, there will be collaboration with scientists working on regional pollen (Firoze Quamar, BSIP, India), diatom and dinocyst proxies (Oscar Romero, AWI), planktic foraminifera-based proxies for oceanographic changes (Marci Robinson, USGS), and drivers of monsoon modelling (Phil Holden, OU). 

Possible timeline

Year 1: Investigate pollen taxa from the study site and familiarise with the pollen using the available atlas and training set. Obtain training in sample processing on pollen and charcoal. Carry out long term data for the study site. Present data at UK-IODP Annual Meeting.

Year 2: Generate age model data by picking benthic foraminifera of samples from early/mid Pliocene. Process pollen and charcoal samples from targeted orbital cycles of the early/mid Pliocene. Present data at Pal(a)eoPERCS seminar.

Year 3: Finish remaining analytical work, data analyses, and present results at an international conference and write up thesis and manuscripts.

Further details

Students should have a strong background in palaeoclimate, and enthusiasm for lab based geochemical methods. If you’re not sure whether your academic background is suitable, please contact one of the supervision team or Olivia Acquah at [Email Address Removed]. We’d be happy to hear from you.

The successful student will join well-established teams researching in Palaeoenvironmental Change at the Open University and researchers at BGS.

Applications should include:

• A covering letter that includes: • Your motivation to study for a PhD in general • Your interest in this project in particular • The project-specific skills, aptitude and experience you bring to the project.

• an academic CV containing contact details of three references, one of whom should be able to comment on your academic abilities.

• and an Open University application form. • If you are British, please use the Home form • If you are not British, please use the International form.

Applications should be sent to [Email Address Removed] by 12 noon on Monday 1st March 2021.


Funding Notes

OU projects: Successful candidates will receive:
• An annual stipend of £15,285 paid directly to the student in monthly increments for 3.25 years
• Full university fees
• A research training support grant (RTSG) of £3,000

References

[1] Andrae, J. W. et al. (2018) Initial expansion of C4 vegetation in Australia during the late Pliocene, Geophysical Research Letters, 45, 4831-4840
[2] Tipple, B. J. and Pagani, M. (2007) The early origins of terrestrial C4 photosynthesis, Annual reviews of Earth and Planetary Sciences, 35, 435-461.
[3] Chen, X. et al (2014) Vegetation history, climatic changes and Indian Summer Monsoon evolution during the last glaciation (36,400 – 13,400 cal yr BP) documented by sediments from Xingyun Lake, Yunnan, China, Palaeogeography, Palaeoclimatology, Palaeoecology, 410, 179-189.
[4] Kulkarni, C., Finsinger, W., Anand, P., Nogue, S., and Bhagwat, S. A. (2021) Synergistic impacts of anthropogenic fires and aridity on plant diversity in the Western Ghats: Implications for management of ancient social-ecological systems, Journal of Environmental Management, accepted.
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