The Seward Line
Location: The Seward Line is a transect of oceanographic survey stations that begins at the GAK1 mooring at the mouth of Resurrection Bay in the Gulf of Alaska (59°50.7’N, 149°28.0’W) and continues south across the Gulf of Alaska to the outer edge of the continental shelf, or “shelf break” (58°5.9’N, 147° W). Seward line website.
Timeline: Sampled twice per year; May & September. OA sampling started in 2008
Instrumentation: Shipboard Niskin bottle grabs
Description: High quality water sample measurements for OA are collected on the Seward Line, and allowing researchers to empirically derive carbonate parameters to help produce forecast models for OA. The goal is to continue this transect regularly for 10 years and then less frequently to monitor increasing CO2 and changing freshwater discharge into Resurrection Bay.
Lead Investigator: Russ Hopcroft, University of Alaska Fairbanks
Funding source: Primary support from AOOS, NSF, with additional logistical support from NPRB, Gulf Watch and UAF
Kachemak Bay/Lower Cook Inlet Sampling
Location: 5 transects in lower Cook Inlet and Kachemak Bay (60.056, -154.365; 60.02, -150.9; 58.573, -154.349; 58.539, -151.033)
Timeline: Began in 2011; ongoing.
- Four lower Cook Inlet and outer Kachemak Bay transects (12 marine plankton and water stations) sampled quarterly
- One inner Kachemak Bay Transect (10 CTD stations and 3 marine plankton and OA monitoring sampling stations) sampled monthly
Instrumentation: Water samples collected at the surface and collected approximately 5m from the ocean bottom. In 2012-2013, samples were collected under a grant from AOOS to KBL and processed by UAF. In 2016, samples are collected by KBNERR and sent to the Alutiiq Pride Shellfish Hatchery for analysis.
Description: Ocean acidification was identified by local and regional stakeholders as an important issue in south central Alaska for subsistence & recreational food sources. Local stakeholders were also concerned that we do not have baseline information to help inform how ocean acidification will transform the local near shore ecology of the region (KBNERR Bivalve Proceedings 2014). The complexity of ocean chemistry in estuaries has led to this important habitat being omitted, thus far, from strategies developed for monitoring ocean acidification in Alaska. The KBNERR has a long-term monitoring program that can support and help direct additional monitoring and research into the complex nature of ocean acidification in estuary habitats in south-central Alaska. Through our existing programs and partnerships, we plan to grow this area of expertise for our region on a local, regional, national, and international scale.
Lead Investigators: Angie Doroff, Kachemak Bay Research Reserve; Kris Holderied, NOAA Kasitsna Bay Lab
Funding Source: AOOS 2012-2013, EVOSTC 2012-2016 for logistical support, Alutiiq Pride (BIA grant) for sample analysis in 2016.