Chelsea Cove is a recently opened portion of the Hudson River Park's Segment 5, which stretches from Pier 64 south to Pier 54, by the popular Chelsea Piers. Designed by Michael van Valkenburgh Associates, the segment has the "largest continuous park spaces within the Hudson River Park." The Cove features a central lawn, skate park, carousel, and entry garden. The Pier 62 Carousel is by CRSTUDIO, who "grafted a faceted thin shed roof over the carousel, unifying it with the shard-like planting forms that co-inhabit the pier."
The enclosure is basically five trusses, columns, and a planted roof. The last is visible from the north (top photo) and the east (above), but I wish it was even more overt, like a canted billboard for green roofs. Diagrams on this page give a better idea of how the trusses work; in person the angled structure is a bit confusing, reflecting the fragmented form of the site.
Pier 62 Carousel won't be the only old carousel with a new enclosure inhabiting a New York City riverside park; Jane's Carousel is set to open in Spring 2011 in Brooklyn Bridge Park, in new digs designed by Jean Nouvel.
#1 - Phyto Universe
#2 - One Bryant Park