Project Major Findings

Chris Shuman

The goal of our original Siple Dome proposal was to utilize remote sensing data to understand spatial processes that influenced stratigraphic development and stable isotope-temperature relationships. Both of these primary goals were challenged by differences between Siple Dome and central Greenland where the techniques were first developed. Warmer temperatures, lower accumulation rates, and generally more variable meteorological conditions resulted in less distinctive seasonal stratigraphy. These factors also increased isotopic diffusion. In addition, development of the multi-year surface temperature history needed to calibrate the isotopic profiles was complicated by significant melt in the area which reduced the effectiveness of emissivity modeling.

Through collaborations, development of an extended and validated temperature history at Siple Dome using a combination of in situ and satellite observations is in progress. This record will allow improved assessments of the isotope-temperature relationship as well as better constrained borehole thermometry. This and other aspects of the work at Siple Dome including accumulation are currently in preparation.

Shuman, C.A.and J.C. Comiso. 2002. In Situ and Satellite Surface Temperature Records in Antarctica. Annals of Glaciology 34: 113-120.

Das, S.B., R.B. Alley, D.B. Reusch, and C.A. Shuman. 2002. Temperature variability at Siple Dome, West Antarctica, derived from SSM/I and SMMR brightness temperatures, ECMWF reanalyses, and AWS records. Annals of Glaciology 34, no. 1 (January): 106-112.

Shuman, C.A. and C.R. Stearns. 2001. Decadal-length composite inland West Antarctic temperature records. Journal of Climate 14, no. 9, 1977-1988.