Hoang Long NguyenDoctoral Student
The project ”Paleosun – the paleoperspective on the mechanisms behind the sun-climate link” aims to improve solar activity reconstructions using different geologic archives and to improve sun-climate studies with radionuclide and climate proxy measurements from the same archive.These studies will also enable us to obtain very accurate and precise time scales that are crucial for reliable paleoclimate studies. Another aspect will be novel solar activity reconstructions and investigations of the linkages to climate change.
As part of the Paleosun Project, my PhD project aims to improve solar activity reconstructions into the past. The results will be important for solar and sun-climate studies as well as for a better understanding of past changes in the carbon cycle.
Cosmogenic radionuclide records reflect a combination of production and deposition processes (atmospheric circulation (10Be) and carbon cycle (14C)). Presently the different radionuclide records show disagreements regarding their long-term (millennial time scales) changes for reasons that are not understood. This leads to major uncertainties in reconstructions of past changes in solar activity.
My PhD project will be based on 10Be measurements in ice samples from Antarctica covering the last 20000 years. The new record will be analysed in combination with existing 10Be data from ice cores and tree- ring 14C data. It will involve assessment of climate and geomagnetic field influences on radionuclide records and carbon cycle influences on 14C.
Supervisors: Raimund Muscheler (main supervisor, LU); Andreas Nilsson (LU).