An official website of the United States government.
Here's how you know we're official.
A .gov website belongs to an official government organization in the United States.
A small lock or https:// means youโve safely connected to a .gov website. Share sensitive information only on official, secure websites.
This animation is a composite of average weekly sea surface temperatures over the course of a year. Yellow and orange represent hotter waters and green, blue and purple represent progressively cooler waters. Broad scale, environmental processes can have long ranging effects on coral reefs, which are particularly sensitive to changes in temperature. Studying trends on a global scale can help scientists understand why reefs in certain areas are flourishing and others are suffering.
A red asterisk (*) indicates a required field.
alert message