ANTARCTICA - The only shipboard analysis we are doing for the JPCs on this particular cruise is for magnetic susceptibility (MS). MS gives us clues as to the geologic provenance of the sediments and entrained coarse material, which serves as a proxy for the depositional environment: a high MS indicates the presence of terrigenous material likely to have fallen out of the bottom of a glacier, whereas a low MS indicates a more open-water depositional environment and the absence of an overlying glacier. By running MS on the JPC and JGCs (and JTC, the trigger core), we can see what sediment we collected and start to loosely define different sedimentary and climatic events. Visit Expedition Antarctica to view the rest of the article.
ANTARCTICA - The past 48 hours (approximately) have been relatively calm as far as work goes since some bad weather (35-45 knot winds) has halted over-the-deck operations. However, we were able to maintain station long enough (3.5 hours) for a rosette CTD and Amelia’s water pumping, which allows her and her colleagues at USF and elsewhere to collect archaea in different water masses and compare their population genomics. Visit Expedition Antarctica for more of the article.
ANTARCTICA - The seismic guns deliver a low energy pulse into the water column, which may have the potential to negatively affect marine mammals if they are exposed to 180 decibels or more in the water. Visit Expedition Antarctica to read the rest of the article.
ANTARCTICA - While passing time on a slow shift, most people read, write papers, or help another group with their sampling. Occasionally, someone will post a crossword and passers-by will stop to fill out a word or phrase on their way between jobs. For the students, downtime during shift is a perfect time to write a blog, check email, or peruse papers that our PIs have assigned. Visit Expedition Antarctica to continue reading the article.