On Climate Reconstruction Using Bivalve Shells : Three Methods To Interpret the Chemical Signature of a Shell

• To improve our understanding of the climate process and to assess the human impact on current global warming, past climate reconstruction is essential. The chemical composition of a bivalve shell is strongly coupled to environmental variations and therefore ancient shells are potential climate archives. The nonlinear nature of the relation between environmental condition (e.g. the seawater temperature) and proxy composition makes it hard to predict the former from the latter, however. In this paper we compare the ability of three nonlinear system identification methods to reconstruct the ambient temperature from the chemical composition of a shell. The comparison shows that nonlinear multi-proxy approaches are potentially useful tools for climate reconstructions and that manifold based methods result in smoother and more precise temperature reconstruction.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)

Nyckelord

Climate reconstruction

Nonlinear multi-proxy models

Manifold learning

Support Vector Regression

Bivalve

Sclerochronology

TECHNOLOGY

TEKNIKVETENSKAP

Automatic control

Reglerteknik

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)