IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
SOUTHERN OCEAN AND ANTARCTIC PENINSULA TEMPERATURES DURING CRITICAL CLIMATE TRANSITIONS OF THE CENOZOIC CONSTRAINED BY CLUMPED ISOTOPE THERMOMETRY
Autor/es:
DILL, R; EAGLE, R; MERING, J; PETRYSHYN, V; TAVIANI, M; MARENSSI, S.; HARWOOD, D; LUNT, D; VALDEZ, P; TRIPATI, A
Lugar:
Vancouver
Reunión:
Congreso; GSA Annual Meeting; 2014
Resumen:
The Southern Ocean and Antarctica play
fundamental roles in the global climate system. These polar regions are a major
area for the net loss of heat to space. Ice storage on Antarctica also
influences the global water cycle. Through upwelling of deep waters, the
Southern Ocean is an important regulator of atmospheric CO2. To
better constrain the evolution of paleoclimate in this region over major
climate transitions of the Cenozoic, we estimated ocean temperatures using
clumped isotope thermometry. Clumped isotope thermometry is a
thermodynamically-based stable isotope thermometer that can be used to
constrain temperatures previously estimated using other paleothermometers
(which in turn leads to constraints on ice volume), as it allows the exclusion
of water isotope composition from temperature estimates (unlike the δ18O thermometer). We previously have published
calibrations for foraminifera and mollusks, two of the major archives used in
this study. Critical transitions investigated include the Eocene-Oligocene
boundary and the Middle Miocene Climate Transition. Study sites include Seymour
Island (Antarctic Peninsula), ANDRILL (Southern McMurdo Sounds), Ocean Drilling
Program (ODP) Sites 689/690 (Weddell Sea), and ODP 744 (Kerguelen Plateau). Results
will be compared to GCM output.