Arctic waters are changing, and scientists have been watching the seas off the western coast of Alaska to monitor marine ecosystems â€” from water temperatures to algae, fish and more.
Seth Danielson, an oceanographer and associate professor at the University of Alaska Fairbanks, was the chief scientist on the project and gave an update on the researchersâ€™ activity on Wednesday, briefly covering the interdisciplinary components of the research. The research is funded by the North Pacific Research Board, a board established by Congress that grants research funds for this area of the ocean.
â€śTheir approach is to try to bring together multiple funding agencies, multiple researchers in a fairly large top to bottom ecosystem study,â€ť Danielson explained during his presentation at UAF.
The Arctic Shelf Growth, Advection, Respiration and Deposition project involves a team of researchers from UAF traveling to the Bering Strait and Chukchi Sea areas onÂ a shipÂ named Sikuliaq for three weeks in June overÂ the past two years.
ASGARD falls under NPRBâ€™s Arctic Integrated Ecosystem Research Program. The UAF group proposed the project to the board in a bid to be selected for research in the area.
â€śWe were lucky enough to be successful with that competition,â€ť Danielson said.
The subject theyâ€™re studying, according to Danielson, is how reductions in sea ice and associated environmental changes influence the flow of energy through the ecosystem.
â€śI think that thereâ€™s enough to keep going after here,â€ť he said as he wrapped up his Wednesday presentation.
Normally, the area the project explores is inaccessible for large portions of the year, due to the presence of sea ice. Having an expedition as early as June allowed the team to gather data from the seas that is underrepresented in research.
One of the intriguing things about the spring expedition, according to Dean Stockwell, a biological oceanographer working on the project, was that when the research crew arrived in Nome in 2017, there was open water.
Stockwell said he had his fingers in several pots during the two expeditions. His main focus, however, was the phytoplankton. Due to the lacking ice, he was able to measure how fast phytoplankton populations in the area were growing.
â€śSo what weâ€™re seeing is an earlier development of open water, which allows the phytoplankton then to grow at an earlier time in the area,â€ť he said.
Stockwell said that, similar to plants, phytoplankton photosynthesize, but theyâ€™re somewhat different organisms.
â€śIn a sense, yes, phytoplankton are plants, but theyâ€™re in that algae group,â€ť Stockwell said. â€śTheyâ€™re not like a rose bush, basically, so theyâ€™re very simple plants.â€ť
Though they may be microscopic, phytoplankton are one part of the larger picture of productivity in the area.
â€śSo in the spring, when the sun first hits that area, the bottom part of the ice allows the sun to come through,â€ť he said. Phytoplankton ranging from single-celled plants to larger-celled diatoms grow on the bottom of the ice, then fall through the water as the ice melts.
When the phytoplankton fall through the water column, Sarah Hardy and Caitlin Forsterâ€™s research comes into play. Forster is a graduate student who was observing the fish in the area, while Hardy, an associate professor, was looking at benthos, organisms that live on the seafloor.
â€śOur main purpose is to try and figure out what the role of the benthic organisms is in consuming all these materials in the ice break up and the spring phytoplankton bloom,â€ť Hardy said.
Hardy said that, oftentimes, she thinks microscopic organisms can be overlooked because it can be difficult to see the direct link to the larger marine mammals. It all comes down to the food web, though. Walruses, whales and other predators like to eat benthos, and benthos eat the phytoplankton.
â€śEverybody eats somebody else, so these smaller things that are food for larger things help make the system function,â€ť she said.
Something else that makes the system functionÂ is where Danielsonâ€™s research came into play. He was looking at a crucial aspect of marine life: the water.
Danielsonâ€™s work with a conductivity-temperature-depth device measured water temperatures during their trip through the seas, alongside a number of other variables, such as salinity and nutrients.
The teamÂ also had a deviceÂ that sat on the sea floor with a wire extending to a buoy. This device would take in periodic data for a full year.
â€śWe found that it was incredibly warm in the water year-round,â€ť he said
He added they expect to see temperatures right at the freezing point during winter, but their findings indicated the ocean was sitting about 1 or 2 degrees above freezing.
What Hardy discovered among the benthos was a 30 percent increase in â€śenergy demand.â€ť
â€śSo that suggests that at those warmer temperatures theyâ€™ll require 30 percent more food essentially than they do at zero degrees (Celsius),â€ť she said.
Meanwhile Forster, who is graduating with her masterâ€™s degree next month, noticed something surprising about the fish population.
â€śOne of the biggest findings weâ€™ve had was actually what wasnâ€™t there,â€ť she said.
Forster said Arctic cod, which the scientists know are abundant in the area from prior research, had little presence among the fishÂ brought up inÂ the trawl for inspection.
â€śIt helped us think about the life cycle of this species in a new way,â€ť she said.
Forster said the fish she was looking at were not the kind people usually catch for food. But, much likeÂ benthos, the fish are food for larger marine life and birds.
â€śAnd so by understanding, you know, the fish communities and abundances and then, perhaps, how those (communities and abundances) are important for those predators, thatâ€™s where the human component would come in,â€ť Forster said.
The changes to the environment notably have an impact on coastal communities.
AnÂ example that came up during Danielsonâ€™sÂ talk Wednesday isÂ the presence of toxic algal blooms.
Stockwell tested phytoplankton on the expedition for paralytic shellfish poisoning. Normally, these types of toxins do not thrive in colder water conditions; therefore, the chances of either benthos or fish ingesting the blooms andÂ then, in turn, being consumed by other predators havenâ€™t been a problem until recently.
â€śNow with kind of warmer water pushing through the straits at an earlier time, these harmful algae have more of a chance to extend up to the Chukchi and get eaten, and put into the food chain,â€ť he said. â€śAnd so thatâ€™s why Iâ€™m kind of worried about a warmer Chukchi Sea, if you will.â€ť
According to Stockwell, some coastal communities have begun to open up labs to test food.
Stockwell is waitingÂ for some of his 2018 samples to be analyzed, but determining what everything meansÂ will require everyone from the expeditionÂ to compileÂ their results.
â€śWeâ€™ll putÂ (everyoneâ€™s results)Â all together, but itâ€™s like building a house,â€ť he said. â€śYou have to at least get all the parts there first.â€ť
Stockwell also cautioned the team has only a â€śsnapshotâ€ť of time. Systems are constantly changing; the environment can be in flux, then plateau and change again.
â€śWeâ€™re in one of these fluxes right now where things are changing pretty fast,â€ť he said.
Beyond the warmer temperatures affecting the food chain, the ice receding is presenting problems for coastal life.
â€śSo, for instance, erosion along various Alaskan coastlines is very high in places where we no longer have as much sea ice as we used to,â€ť Danielson said, â€śbecause now we have bigger waves of the ocean and the bigger waves are coming to shore.â€ť
He added that, even if sea levels arenâ€™t rising anywhere near Fairbanks, the effects of climate changeÂ is something that society will be deciding how to address in coming years.
â€śBut (ASGARDâ€™s) focus is really on trying to get a better handle on how the ecosystem of the northern Bering and the Chukchi Sea is going to adjust over the time scale of the next 10 to 20 years,â€ťÂ Danielson said, â€śand how these changes in the reductions of sea ice over this time are going to impact the flow of energy and the productivity.â€ť
The data from the past two years still is being compiled for analysis, peer reviewing and publication.
Readers interested in some of the day-to-day research that took place during the expedition can visit bit.ly/2VVVTXB. The reports published online come from principal investigators and community observer Opik Ahkinga. This information is not the research crewâ€™s finalized data analysis.
Contact staff writer Kyrie Long at 459-7572.