Core JPC17B was collected from the Adélie-Drift, a nearly 300-m thick drift deposit at 140ºE along the
Indian Ocean sector of the Antarctic continental shelf. Sediments consist of nearly continuously laminated diatom mud and diatom ooze, with accumulation rates on the order of 20-21 m kyr-1 based on 10 AMS radiocarbon dates. Spectral analysis was performed on time series of opal content, d13Corg, Ti content, and Ba content. Strong decadal to century-
scale variability is present in all proxies. Opal and Ti-time series show strong variance at periods of 11, 22 and 110-
years, which are suggestive of solar forcing. Ba-time series exhibits strong variance at a period of 3-3.6-yr, consistent with possible El Niño-Southern-Oscillation (ENSO) forcing.
Additional Publication Details
USGS Numbered Series
Solar forcing and El Niño-Southern Oscillation (ENSO) influences on productivity cycles interpreted from a late-Holocene high-resolution marine sediment record, Adélie Drift, East Antarctic Margin