Evaluation of operational SSM/I ice-concentration algorithms

• Main Authors: Meier, Walter, Van Woert, Michael, Bertoia, Cheryl
• Format: Text
• Language: unknown
• Published: DigitalCommons@University of Nebraska - Lincoln 2001
• Subjects: Environmental Sciences; Antarctic; Arctic; Antarc*; Sea ice
• Online Access: https://digitalcommons.unl.edu/usdeptcommercepub/75; https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1062/viewcontent/Bertoia_AG_2001_Evaluation_operational.pdf

The United States National Ice Center (NIC) provides weekly ice analyses of the Arctic and Antarctic using information from ice reconnaissance, ship reports and high-resolution satellite imagery. In cloud-covered areas and regions lacking imagery, the higher-resolution sources are augmented by ice concentrations derived from Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave/Imager (SSMII) passive-microwave imagery. However, the SSMII-derived ice concentrations are limited by low resolution and uncertainties in thin-ice regions. Ongoing research at NIC is attempting to improve the utility of these SSMII products for operational sea-ice analyses. The refinements of operational algorithms may also aid future scientific studies. Here we discuss an evaluation of the standard operational ice-concentration algorithm, Cal/Val, with a possible alternative, a modified NASA Team algorithm. The modified algorithm compares favorably with CallVal and is a substantial improvement over the standard NASA Team algorithm in thin-ice regions that are of particular interest to operational activities.