the month number (since deployment) that data were collected, with zero meaning deployment date, "one" being one month after deployment, and "three" as well as "nine" being three and 9 months after deployment.
The month that the survey was done. Dates reflect measurements taken in local time. For sites in Alaska, local time is Alaska Standard Time except during months when Alaska Daylight time is effective. For all other Pacific Coast sites, local time is Pacific Standard Time except during months when Pacific Daylight Time is effective.