A passive microwave radiometer can detect a change of 0.9 K in its antenna temperature and has an effective ground resolution of 140 km2. It is operated to observe sea ice floes (brightness temperature of 253 K) surrounded by water (brightness temperature of 119 K). What is the smallest detectable ice floe by this instrument? You can assume the antenna is equally sensitive through its entire footprint

A passive microwave radiometer can detect a change of 0.9 K in its antenna temperature and has an effective ground resolution of 140 km2. It is operated to observe sea ice floes (brightness temperature of 253 K) surrounded by water (brightness temperature of 119 K). What is the smallest detectable ice floe by this instrument? You can assume the antenna is equally sensitive through its entire footprint

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