Home » Data Overview

Data Overview

Current research activities generate multiple types of data. For instance, continuing tri-annual cruises measure oceanographic conditions along established transect lines in specific seasons. Additionally, process studies and experiments investigate ecological processes in the Gulf of Alaska and within discrete areas such as the plume of the Copper River. Finally, modeling studies use these data to constrain parameters and validate results.

Are you looking for archived data?

Screenshot of our Data Catalog

Archived NGA LTER data is hosted by our partner Axiom Data Science. Consequently, it is accessible via a data catalog that is part of the DataONE cyberinfrastructure.

What You’ll Find in the Data Catalog

How do Data Catalog searches work?

What is returned by the search?

How are data files organized?

Are you looking for Signature Datasets?

Because the diversity of NGA LTER datasets may make them difficult to use in scientific synthesis efforts, we also provide our data in simpler formats. As they are produced, they will be our Signature Datasets.

Signature Datasets are available for:

  • Seward Line Zooplankton Biomass (Population Studies)
  • Seward Line Physical Hydrography (Disturbance Patterns)
  • GAK1 Temperature and Salinity Time Series (Disturbance Patterns)
  • Seward Line Nutrients (Movement of Inorganic Matter)
  • Integrated Chlorophyll (Primary Production)

If you are interested in a time series of data that you do not see in the list, please let us know.

Other Collections of Recent Data

Data from R/V Sikuliaq Instruments

We are fortunate that R/V Sikuliaq is the platform for many of our research cruises. As a UNOLS vessel, R/V Sikuliaq’s instrumentation provides data directly to the Rolling Deck to Repository (R2R).

Links to the R2R archives of our recent cruises:

Interactive Model Results

Several modeling efforts are underway in connection with NGA LTER. The model results can be explored via a web browser in the Alaska Ocean Observing System’s (AOOS‘s) Gulf of Alaska portal. These models are currently available:

NGA LTER Physical-Biogeochemical Model (Fiechter)

Gulf of Alaska COBALT hindcast (Hauri et al., 2020)

Historical Context

Types of Data Available

globec logo

The U.S. GLOBEC Northeast Pacific (NEP CGOA) program focused on salmon and their environment (1997-2004). Those efforts sampled along the Seward Line and other transects. In addition to salmon haul data, GLOBEC datasets include zooplankton counts, CTD station data, and results from phytoplankton growth rate and microzooplankton grazing experiments.

Map of NGA Stations
Map of Northern Gulf of Alaska sampling stations

Between the GLOBEC years and the current LTER program, various projects continued collecting Seward Line data (2005-2017). These datasets include physical properties, nutrients, and chlorophyll collected along the Seward Line for monitoring purposes. NPRB’s Project Search & Database and Gulf Watch’s Environmental Drivers Overview provide information on individual projects, including some final reports.

Additionally, annually deployed moorings and month CTD sampling provide long time series at the station GAK1. Recently, moorings have also been deployed at the GEO mooring location near GAK4.

Additional Archives

While we are working to consolidate these decades of data under the umbrella of NGA LTER, other archives provide data from these historic projects as well. If you prefer to visit the original archives, refer to these links: