In a powerful intersection of art and environmental science, sound artist Yoichi Kamimura’s new album, “ryūhyō,” offers a poignant auditory document of Japan’s dwindling sea ice. The record is a sonic elegy for a changing ecosystem. Locals recall a time when the ice was thick enough to walk on, emitting a whistling sound known as Ryūhyō-Nari. Today, that sound is gone.