Snow melting bias in microwave mapping of Antarctic snow accumulation

O. Magand, G. Picard, L. Brucker, M. Fily, C. Genthon
2008 The Cryosphere Discussions  
Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion The Cryosphere Discuss., 2, 255-273, 2008 Abstract Satellite records of microwave surface emission have been used to interpolate insitu observations of Antarctic surface mass balance (SMB) and build continental-scale maps of accumulation. Using a carefully screened subset of accumulation measurements in the 90 • -180 •
more » ... in the 90 • -180 • E sector, we show a reasonable agreement with microwave-5 based accumulation map in the dry-snow regions, but large discrepancies in the coastal regions where melt occurs during summer. Using an emission microwave model, we explain the failure of microwave sensors to retrieve accumulation by the presence of layers created by melt/re-freeze cycles. We conclude that regions potentially affected by melting should be masked-out in microwave-based interpolation schemes. 10 suggest the new SMB map may eliminate some of the discrepancies between climate 256 Abstract TCD 2, 255-273, 2008 Abstract 2, 255-273, 2008 Abstract TCD 2, 255-273, 2008 Abstract TCD 2, 255-273, 2008 Abstract 2, 255-273, 2008
doi:10.5194/tcd-2-255-2008 fatcat:m2nc2fz32ndt5l3ydjmg725xqm