In addition to runoff, wind blows material into the ocean. This material may be local or from other regions. For example, dust from the Sahara moves to the Caribbean and Florida. Dust also blows from the Gobi and Taklamakan deserts across Korea, Japan, and the Northern Pacific to the Hawaiian Islands. Since 1970, dust deposits have grown due to drought periods in Africa. Dust transport to the Caribbean and Florida varies from year to year with greater flux during positive phases of the North Atlantic Oscillation. The USGS links dust events to reduced health of coral reefs across the Caribbean and Florida, primarily since the 1970s. Dust from the 1883 eruption of Krakatoa in Indonesia appeared in the annular bands of the reef-building coral Montastraea annularis from the Florida Reeftract.