King County collects in situ water column data at offshore monitoring stations using a Conductivity Temperature Depth (CTD) sensor. The CTD is a multi-sensor array that measures dissolved oxygen, salinity, temperature, density (calculated), nitrate+nitrite, and fluorescence (as a measure of chlorophyll). The dashboard below allows users to explore and download this data for the Whidbey Basin. See other offshore CTD monitoring data from around King County. Associated bottle sample data are also available to download in the King County Open Data portal.