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Ice thickness effects on Aquarius brightness temperatures over Antarctica

AutorPablos, Miriam ; Piles, María ; González, Verónica ; Camps, Adriano ; Vall-llossera, Mercè
Fecha de publicaciónabr-2015
EditorAmerican Geophysical Union
CitaciónJournal of Geophysical Research-Oceans 120(4): 2856-2868 (2015)
ResumenThe Dome-C region, in the East Antarctic Plateau, is regarded as an ideal natural laboratory for calibration/validation of space-borne microwave radiometers. At L-band, the thermal stability of this region has been confirmed by several experimental campaigns. However, its use as an independent external calibration target has recently been questioned due to some spatial inhomogeneities and seasonal effects revealed in the brightness temperatures (TB) acquired in this area. This paper shows the observed relationship, from exploratory research, between the Antarctic ice thickness spatial variations and the measured Aquarius TB changes. A 3-months no-daylight period during the Austral winter has been analyzed. Four transects have been defined over East Antarctica covering areas with different ice thickness variations and ranges. The theoretical L-band penetration depth has been estimated to understand the possible contributions to the measured signal. A good agreement has been observed between Aquarius TB and ice thickness variations over the whole Antarctica, with correlations of ∼0.6-0.7. The two variables show a linear trend with slopes of ∼8.3-9.5 K/km. No correlation has been observed with the subglacial bedrock. The maximum L-band penetration depth has been estimated to be ∼1-1.5 km. Results are therefore consistent: the spatial variations found on Aquarius TB are not related to the emissivity of the bedrock, which lies deeper. This study provides evidence that new L-band satellite observations could contribute to further our understanding of Antarctic geophysical processes. Key Points: Relationship between Antarctic ice thickness and observed Aquarius TB. Maximum L-band penetration depth over Antarctic ice.Possible influence of subglacial lakes on Aquarius TB © 2015. American Geophysical Union. All Rights Reserved
Descripción13 pages, 7 figures, 1 table, the Aquarius L2 V3.0 data are available at oceandata.sci.gsfc.nasa.gov/Aquarius/V3/V3.0/L2, the Antarctic data sets from the Bedpmap2 project are available at https://secure.antarctica.ac.uk/data/bedmap2/, the subglacial lakes inventory is available at http://dx.doi.org/10.1017/S095410201200048X
Versión del editorhttp://dx.doi.org/10.1002/2014JC010151
Identificadoresdoi: 10.1002/2014JC010151
e-issn: 2169-9291
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