An intercomparison between AMSR-E snow-depth and satellite C- and Ku-band radar backscatter data for Antarctic sea ice

Abstract Advanced Microwave Scanning Radiometer (AMSR-E) snow-depth data for Antarctic sea ice are compared with ship-based visual observations of snow depth, ice type and ridged-ice fraction, and with satellite C-band and Ku-band radar backscatter observations for two ship cruises into the Weddell Sea (ISPOL 2004–05,WWOS 2006) and one cruise into the Bellingshausen Sea (SIMBA 2007) during late winter/spring. Most (>75%) AMSR-E and ship-based snow-depth observations agree within 0.2 m during WWOS and SIMBA. Remaining observations indicate substantial underestimations of snow depths by AMSR-E data. These underestimations tend to increase with the ridged-ice fraction for WWOS and SIMBA. In areas with large snow depths, a combination of relatively stable low C-band radar backscatter and variable Ku-band radar backscatter is associated with undeformed first-year ice and may indicate snow metamorphism at this time of year during SIMBA. In areas with small snow depths, a combination of relatively stable low Ku-band radar backscatter, high C-band radar backscatter and low C-band radar backscatter standard deviations is associated with rough first-year ice during SIMBA. This information can help to better understand causes of the observed AMSR-E snow-depth bias during late-winter/spring conditions with decreasing average snow depth and to delineate areas where this bias occurs.

[1]  David G. Long,et al.  Image reconstruction and enhanced resolution imaging from irregular samples , 2001, IEEE Trans. Geosci. Remote. Sens..

[2]  Ted Maksym,et al.  Antarctic Sea Ice Thickness and Snow-to-Ice Conversion from Atmospheric Reanalysis and Passive Microwave Snow Depth , 2008 .

[3]  Albin J. Gasiewski,et al.  Microwave Signatures of Snow on Sea Ice: Observations , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[4]  Thorsten Markus,et al.  Snow Depth Distribution Over Sea Ice in the Southern Ocean from Satellite Passive Microwave Data , 2013 .

[5]  Stephen F. Ackley,et al.  Intercomparisons of Antarctic sea ice types from visual ship, RADARSAT-1 SAR, Envisat ASAR, QuikSCAT, and AMSR-E satellite observations in the Bellingshausen Sea , 2011 .

[6]  Thorsten Markus,et al.  Evaluation of AMSR‐E snow depth product over East Antarctic sea ice using in situ measurements and aerial photography , 2008 .

[7]  James R. Wang,et al.  Sensitivity of passive microwave snow depth retrievals to weather effects and snow evolution , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[8]  Martin O. Jeffries,et al.  Antarctic sea ice : physical processes, interactions, and variability , 1998 .

[9]  L. Phalippou,et al.  CryoSat: A mission to determine the fluctuations in Earth’s land and marine ice fields ☆ , 2006 .

[10]  Thorsten Markus,et al.  Sea ice concentration, ice temperature, and snow depth using AMSR-E data , 2003, IEEE Trans. Geosci. Remote. Sens..

[11]  Frank D. Carsey,et al.  Microwave Remote Sensing of Sea Ice , 1992 .

[12]  Albin J. Gasiewski,et al.  Impact of Surface Roughness on AMSR-E Sea Ice Products , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[13]  C. Haas,et al.  The importance of diurnal processes for the Seasonal cycle of Sea-ice microwave brightness temperatures during early Summer in the Weddell Sea, Antarctica , 2006, Annals of Glaciology.

[14]  Ian Allison,et al.  Snow on Antarctic sea ice , 2001 .

[15]  Christian Haas,et al.  The seasonal cycle of ERS scatterometer signatures over perennial Antarctic sea ice and associated surface ice properties and processes , 2001, Annals of Glaciology.

[16]  M. Maqueda,et al.  Modelling the influence of snow accumulation and snow-ice formation on the seasonal cycle of the Antarctic sea-ice cover , 1999 .

[17]  Stephen F. Ackley,et al.  Sea ice and snow cover characteristics during the winter-spring transition in the Bellingshausen Sea: An overview of SIMBA 2007 , 2011 .

[18]  Ron Kwok,et al.  ICESat over arctic sea ice : Interpretation of altimetric and reflectivity profiles , 2006 .

[19]  Florian Siegert,et al.  ENVISAT multisensor data for fire monitoring and impact assessment , 2004 .

[20]  H. Hellmer,et al.  The ISPOL drift experiment , 2008 .

[21]  C. Haas,et al.  High radar-backscatter regions on Antarctic sea-ice and their relation to sea-ice and snow properties and meteorological conditions , 2011 .

[22]  C. Garrity.  Characterization of Snow on Floating Ice and Case Studies of Brightness Temperature Changes During the Onset of Melt , 2013 .