Detecting Holocene Changes in the Atlantic Meridional Overturning Circulation: Integration of Proxy Data and Climate Simulations - Integrated Analysis of Interglacial Climate Dynamics (INTERDYNAMIC) - page 40

Detecting Holocene Changes
in the Atlantic Meridional Overturning
Circulation: Integration of Proxy Data
and Climate Simulations

Audrey Morley, David Heslop, Carsten R ü hlemann, Stefan Mulitza,

Andr é Paul and Michael Schulz

Abstract The contribution of central water circulation to the Atlantic Meridional
Overturning Circulation (AMOC) and its role in natural climate variability remain
poorly understood. Limits in our knowledge are due to the scarcity of high reso-
lution records from central water depth and the limited abilities of proxy parameters
to reconstruct small changes in Holocene central water properties. We addressed
these issues by combining paleoclimate modeling of (UVic ESCM

version 2.8) that identify suitable locations and parameters to reconstruct past
central water variability with the development and application of a new Mg/Ca-
paleotemperature calibration for the benthic foraminifera Hyalinea balthica. The
presented records demonstrate the important role of central water circulation in
communicating regional climate signatures of various forcings (freshwater

' 'fingerprints' '

ux,
solar variability, orbital parameters) onto a hemispheric or global scale via cross-
gyre meridional heat transfer from high to low latitudes.

fl

Keywords Paleoceanography Ocean-atmosphere climate linkages Atlantic

meridional overturning circulation Eastern North Atlantic central water Solar

variability North Atlantic oscillation Fingerprinting Earth system climate

model Hosing experiment