Derivation and optimization of a new Antarctic sea-ice record
The recently developed Bristol passive-microwave-satellite algorithm for deriving sea-ice concentration has possible theoretical and practical advantages over the widely used NASA/Team and Comiso algorithms. It was applied for the first time here to derive a long-term sea-ice series. The Bristol algorithm was reparameterized by manually tuning its brightness temperature tie-points both seasonally and interannually to systematically account for changing environmental conditions, satellite radiometer drift and differences in calibration and observing time between the three Special Sensor Microwave/Imager (SSM/I) sensors. In addition, an automatic algorithm was developed to remove residual noise in SSM/I images. The reparameterized Bristol algorithm performed well against the others tested in an Advanced Very High Resolution Radiometer (AVHRR) thermal infrared case-study validation. The SSM/I sea-ice extent was compared with Geosat radar altimetry and showed good agreement in winter; reasons are proposed to explain the summer difference. The optimized Antarctic sea-ice record spans the whole of the available SSM/I period (July 1987 to December 1997) and reveals a 3±0.3% (3±1.5%) increase in extent (area); it has been used to study Antarctic sea-ice/atmosphere/ocean interactions and climatic couplings.
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Document Type: Research Article
Department of Meteorology, University of Reading, Earley Gate, P.O. Box 243, Reading, Berkshire, RG6 6BB, England, UK
Centre for Remote Sensing, School of Geographical Sciences, University of Bristol, Bristol, BS8 1SS, England, UK
Publication date: 2001-01-10
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