Glacial/interglacial variations in methanesulfonate (MSA) in the Siple Dome ice core, West Antarctica

• Published in: Geophysical Research Letters
• Main Authors: Saltzman, Eric S, Dioumaeva, Irina, Finley, Brandon D
• Format: Article in Journal/Newspaper
• Language: English
• Published: eScholarship, University of California 2006
• Subjects: Physical Sciences and Mathematics; climate change; deposition; dust; methane; sulfur; methanesulfonate (MSA); Siple Dome ice core; glaciers; climate effect; climate feedback; glacial-interglacial cycle; ice core; ice sheet; last glacial maximum; sulfonate; Antarctica; Southern Ocean; West Antarctica; Antarctic; East Antarctica; Greenland; Pacific; Renland; Siple; Siple Dome; West Antarctic Ice Sheet; Antarc*; Greenland ice cores; GRIP; Ice Sheet
• Online Access: http://www.escholarship.org/uc/item/0b66m8t8

Methanesulfonate (MSA) in the Siple Dome ice core is a record of the deposition of biogenic sulfur to the West Antarctic ice sheet covering the past 100 kyr. Siple Dome MSA levels were low during the last glacial maximum, and increased to higher Holocene levels with a several kyr lag relative to the deglacial warming. The positive correlation between MSA and temperature at Siple Dome is similar to that in Greenland ice cores (Renland, GISP2, and GRIP), and stands in contrast to the negative correlation observed at Vostok, East Antarctica. The Siple Dome MSA data suggest that the sign of the high latitude dust/sulfur/climate feedback is negative, at least for the Pacific sector of the high latitude Southern ocean. These results challenge the idea that fertilization by increased dust deposition led to widespread increased DMS emissions from this region of the glacial Southern Ocean.