News & Events

Monday Seminar: El Niño in a foram shell: Extracting past interannual variability from marine sedime

Monday, October 23, 2017, 12:15PM - 1:15PM

Speaker

Tom Marchitto

INSTAAR/GEOL

Location:

SEEC room S228 (Sievers room)

Abstract

El Niño–Southern Oscillation (ENSO) is the leading source of interannual climate variability, but its future behavior is uncertain. The recent geologic record offers information about ENSO’s response to various climate forcings, and that information may be useful for anticipating its response to future greenhouse warming. Geochemical measurements on corals are useful for reconstructing ENSO, but long, continuous coral archives are difficult to find. I will discuss an emerging approach for extracting ENSO variance from marine sediments, using geochemical measurements on individual planktonic foraminifera (protozoa with calcite shells). Results are focused on the Holocene, with timescales of forcing ranging from multi-millennial (orbital) to multi-decadal (solar and volcanic).

Reception

Refreshments will start in the hallway outside the Sievers Room at 11:45. Join us!

Audience

Free and open to the public.