Project Information

Title: LTM Program: Long-term Monitoring of Oceanographic Conditions in the Alaska Coastal Current from Hydrographic Station GAK-1 18120114-I

Project Year and Number: 2018: 18120114-I

Other Fiscal Years and Numbers for this Project: 2024: 24120114-I , 2023: 23120114-I , 2022: 22120114-I , 2021: 21120114-I, 2020: 20120114-I, 2019: 19120114-I, 2017: 17120114-I, 2016: 16120114-P, 2015: 15120114-P, 2014: 14120114-P, 2013: 13120114-P, 2012: 12120114-P

Principal Investigator (PI): Seth Danielson (UAF)

Managing Agency: NOAA

Assisting Personnel: Tom Weingartner (University of Alaska Fairbanks)

Project Website: https://gulfwatchalaska.org/monitoring/environmental-drivers/gulf-of-alaska-mooring-gak1-monitoring/

Research Location: Gulf of Alaska, Prince William Sound

Restoration Category: Monitoring

Injured Resources Addressed: Not Specified

Abstract:

This project continues a 45-year time-series of temperature and salinity measurements at hydrographic station GAK-1. The data set, which began in 1970, now consists of quasi-monthly conductivity-temperature versus depth casts and a mooring outfitted with seven temperature/conductivity recorders distributed throughout the water column and a fluorometer at 20 m depth. The project monitors five important Alaska Coastal Current (ACC) ecosystem parameters that quantify and help us understand hourly to seasonal, interannual, and multi-decadal period variability in: 1) temperature and salinity throughout the 250 m-deep water column, 2) near surface stratification, 3) surface pressure fluctuations, 4) fluorescence as an index of phytoplankton biomass, and 5) along-shelf transport in the ACC. All of these parameters are basic descriptors that characterize the workings of the inner shelf and the ACC, an important habitat and migratory corridor for organisms inhabiting the northern Gulf of Alaska, including Prince William Sound and resources injured by the Exxon Valdez oil spill. We are aware of 69 publications utilizing data collected at station GAK-1, and since 2000 the citation list has grown by nearly three publications per year. Topics covered by these publications range from physical oceanography and climate through trophic (including commercial fisheries) level components and ecosystem analyses. Recent water temperatures have returned to average in the upper 100 m, but warmer than average water remains below 100 m. A newly awarded National Science Foundation Long-term Ecological Research program (awarded to GWA PIs R. Hopcroft and S. Danielson) will leverage and compliment this and other environmental drivers sampling within GWA. We are not proposing any major changes to this project in FY18.


Proposal: View (241 KB)

Reports:
Annual Report FY18: View (1,499 KB)
Final Report: See Project 21120114-I

Publications from this Project: None Available