Workshops

KR8 conference attendees may register for one or more workshops to be held the afternoon of May 23rd, 2017.  The workshops will cost $25 each and run in two consecutive sessions (please see times below).  The workshops will run concurrent with optional afternoon field trips.

Connecting climate models and paleo records Time: 23 May 2017 1-3 PM Location: JGB 2.202 Leader: Pedro DiNezio, Sylvia Dee Back to Top

Continental carbonates petrography: crystallization pathways and growth Time: 23 May 2017 1-3 PM Location: JGB Grad Microscope Lounge Leader: Silvia Frisia Back to Top

Forward modeling of stable oxygen and carbon isotopes in speleothems: introduction to KarstFor, Isolution and Karstsolution Time: 23 May 2017 3-5 PM Location:EPS 1.126 Leader: Andy Baker, Michael Deininger Back to Top

Speleothem Age Modeling Time: 23 May 2017 3-5 PM Location:  JGB 4.102 Leader: Denis Scholz Abstract: Speleothems are widely used as palaeoclimate archives because they offer long, often continuous, high-resolution climate records and occur on almost all continents. In contrast to other climate archives, which are often difficult to date beyond the 14C-dating limit, they can be dated with unprecedented precision in the range of the last 650,000 years by 230Th/U-dating. The spatial resolution of the determined ages is usually lower than that of the proxy analyses. Thus, the age between two adjacent U-series ages needs to be estimated. This is usually referred to as the age model. The construction of an age model is a requirement for all climate archives, and a variety of approaches are available. For speleothems, several methods have been applied. The most frequently used method is linear interpolation between dated sub-sample distances, but polynomial fits and various kinds of splines have also been used. In addition, in recent years, several algorithms particularly developed for speleothems have been published (e.g., StalAge or COPRA). However, there is still no agreement on how to construct speleothem age models or how to estimate the corresponding uncertainty. This is particularly surprising because the precise determination of the timing and duration of climatic events is considered as the major advantage of speleothems as climate archives. In the framework of the workshop, I will briefly introduce the statistical software R and show how to construct simple age models (linear interpolation, splines). I will also present the StalAge algorithm and show how to construct age models using this method. Back to Top