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. Over the coming decade, the quartet of CopernicusSentinel-3 satellite altimeters will provide a continuous record of icesheet elevation change. Ensuring consistency of measurement between thefour satellites requires rigorous in-flight inter-comparison. To facilitatethis, Sentinel-3B was initially flown in a unique tandem formation withSentinel-3A, enabling near-instantaneous, co-located measurements of surfaceelevation to be acquired. Here, we analyse tandem measurements of ice sheetelevation, to show that both instruments operate with statisticallyequivalent accuracy and precision, even over complex ice margin terrain.This analysis demonstrates that both satellites can be used interchangeablyto study ice sheet evolution.

Brief communication: Ice sheet elevation measurements from the Sentinel-3A and Sentinel-3B tandem phase