Otago Geology postgraduate students Ben Perrett and Markus Dengg will share their research.
Kaikōrero (speaker): Ben Perrett
University of Otago Title: Climatic and tectonic controls on the trace element chemistry of rivers in the South Island of New Zealand Abstract:
Trace-elements are essential for many of the processes that control Earth’s global carbon and climate cycles. However, many aspects of trace-element cycling are poorly constrained, in particular those that control the trace-element composition of rivers and their flux into the ocean.
To clarify the environmental factors that control the release of trace elements into rivers, we employed source apportionment and statistical modelling for catchments in the South Island. Results emphasise how climatic and tectonic factors control the ratio of chemical and physical weathering and provide new constraints on the dissolved trace-element chemistry of rivers.
Kaikōrero (speaker): Markus Dengg
University of Otago Title: Micronutrient limitation of phytoplankton growth in Lakes of the Taupō Volcanic Zone Abstract:
Global concentrations of carbon dioxide (CO2) are rising due to anthropogenic activity, leading to warming of the global climate. Carbon sequestration by phytoplankton is one of the most important carbon sinks, counteracting rising CO2 levels. At the same time, rising temperatures lead to increasing occurrence of toxic algae blooms.
Results of this study show for the first time that the micronutrient iron plays an important role in freshwater phytoplankton bloom formation and has the potential to act as a controlling agent, increasing CO2 sequestration in freshwater lakes while limiting the occurrence of toxic algae blooms.
At Level 2 the talks will take place in the Benson common room with up to 18 seats available for in-person attendees. Please do come if you can – an in-person audience is always appreciated!
You will also be able to join remotely via Zoom at the following link:
|Date||Wednesday, 13 October 2021|
|Time||1:00pm - 2:00pm|
|Audience||Parents,Undergraduate students,Postgraduate students,Staff,Alumni|
|Location||Benson Common Room (Gn9), Geology Building, University of Otago, Dunedin|
|Contact Name||Geology Office|