Marina Abramovic stood and faced the ocean on Fire Island.

For a long minute, her arms rose symmetrically from her sides until her body formed a T shape. Her long red dress was stark against the waves. Her palms faced forward.

Ms. Abramovic’s face was not visible, but it was conceivable that she was screaming. The performance artist once screamed for three hours, until she couldn’t anymore (“Freeing the Voice,” 1976); once yelled into her lover’s reciprocating mouth for 15 minutes (“AAA-AAA,” 1978); once persuaded hundreds of people in an Oslo park to shriek in homage to Edvard Munch’s painting “The Scream” (2013).

Perhaps now she was expressing rage at humanity’s spoiling of the planet — the rising seas turned into garbage patches. Years ago, she said, after a deadly tsunami in Southeast Asia, she whipped the ocean 360 times, wanting to punish it.

But no, Ms. Abramovic was not screaming at the ocean. At 77, she was trying to give it positive energy and “unconditional love as a way to heal,” she said in her artist’s statement for “Performance for the Oceans.” The new piece — an edition of three photographs to be auctioned in October by Christie’s in London — was made for the conservation charity Blue Marine Foundation. Each print is valued at about 120,000 euros, according to the charity.

Ms. Abramovic has long explored endurance and extremes, whether by sitting in the Museum of Modern Art for upward of 700 hours or walking across the Great Wall of China. (Or, more recently, leading seven minutes of silence at a rowdy music festival.)