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Field Research Around Qaanaaq Coast, Northwestern Greenland

Research teams of the Research Program on Coastal Environments in the fields of marine, glaciers/ice sheet, land/atmosphere, humanities, or others conduct a variety of research observations around Qaanaaq in northwest Greenland from July to September 2022. In addition to the observations in cooperation with local researchers and residents, a workshop with the local community is also planned. During this stay, some of the research projects selected for the Call for Complementary Research Projects of Priority Subject 1 will also conduct their research through collaboration. Please enjoy reports from the research teams along with photos.

Survey of Marine Ecosystem in The Coastal Area of NW Greenland – Marine Mammals and Seabirds

Writer:Mayuko Otsuki (Hokkaido University)
Yuta Sakuragi (Hokkaido University)

The people in the Arctic coast live in close contact with marine mammals and seabirds. These animals provide important food and clothing for them. However, there are concerns about the impact of climate change on these habits and animals. Thus, from July to August 2022, we conducted the studies on the ecology and distribution of marine mammals and seabirds in Qaanaaq and Siorapaluk in northwestern Greenland.

(Fig. 1)Ringed seal spotted during visual observation
(Fig. 2)Bearded seal spotted during visual observation
(Fig. 3)Little auks spotted during visual observation

First, we conducted visual surveys of marine mammals and seabirds from vessels ship. We observed ringed seals (Pusa hispida, Fig. 1), bearded seals (Erignathus barbatus, Fig. 2), harp seal (Pagophilus groenlandicus) and narwhal (Monodon monoceros). We also observed seabirds that breed in the Arctic region, such as the little auk (Alle alle, Fig. 3) and the black guillemot (Cepphus grylle). Marine observations were also carried out at the same time such as water temperature and salinity measurements and plankton sampling. We plan to clarify the distribution factors of marine mammals and seabirds.

(Fig. 4)Chick of the little auk

With the help of local hunters, we obtained samples of stomach contents, muscles and livers from seals and seabirds. We plan to investigate their feeding habits and contaminants in the future. At the breeding site of the little auk, we searched for their nests and weighted the chicks (Fig. 4) to understand breeding success.

In addition, we successfully deployed five underwater recording devices (Fig. 5) to determine the distribution of narwhals. The presence or absence of narwhal vocalizations indicates their distribution and seasonal variation. These underwater recording devices are scheduled to be retrieved next summer.

(Fig. 5)Deployment of a mooring with an acoustic recorder

(2022/8/25)

Workshop at the Qaanaaq Village, Northwestern Greenland

Writer:Takuro Imazu (Hokkaido University)
Shin Sugiyama (Hokkaido University)

We organized a workshop with residents of the Qaanaaq village on July 31th 2022 (Fig. 1).

(Fig. 1)Opening speech by Toku Oshima, our local collaborator

This event has been organized repeatedly since 2016 to introduce our research activities as well as to discuss environmental change in Greenland and future research direction of our project. ArCS II researchers gave talks on glaciers, ocean, marine ecosystem (e.g. narwhals, seals, fish, birds), animal fur and skins used in Greenland (Fig. 2). During a break, workshop participants enjoyed sushi and Japanese snacks, as well as talked about their experience and ideas about environmental changes in the region. It was a great opportunity for us to communicate with local hunters and kids (Fig. 3).

(Fig. 2)Presentation by an ArCS II researcher
(Fig. 3)Communication with local people with Japanese food and snacks

After the presentations by the researchers, we answered questions from the audience and discussed environmental issues. The subject of the discussion includes marine resources (fish and marine mammals), waste management, marine plastic (Fig 4).

(Fig. 4)Discussion with local residents

People living in Qaanaaq are interested in our research and suggested future research subjects, such as fish migration and possible pollution in the ocean. Moreover, the village people requested us to share research data and publications. To contribute to sustainable future in Greenland, we continue communication with the local community and work together to mitigate the influence of rapidly changing climate and environment.

(2022/8/25)

Survey for Marine Ecosystem in the Coastal Area of NW Greenland – Fishing Gear and Acoustics –

Writer:Makoto Tomiyasu (Hokkaido University)
Kohei Hasegawa (Hokkaido University)

Marine fish is one of the important food resources for people living along the coasts of the Arctic region. To collect information on fish ecology and fishing activities, a survey was conducted from July 17 to August 2, 2022, in the village of Qaanaaq in northwestern Greenland.

(Fig. 1)Arctic char caught by gill net
(Fig. 2)Gill nets set in shallow coastal waters

During the summer, anadromous Arctic char (Salvelinus alpinus) migrate from wintering lakes to the sea for foraging (Fig. 1), and people set gill nets (nylon monofilament, 10 cm mesh, 25 m long) in 1-2 m deep water along the coast to catch char (Fig. 2). We investigated the timing of the catch of char in the gill nets and the differences in migration timing by size.

(Fig. 3)Bottom long line used for Greenland halibut fishing

During the winter season when sea ice covers the ocean, bottom longline fishing for Greenland halibut (Reinhardtius hippoglossoides) is conducted, and the characteristics of the fishery were investigated (Fig. 3). Future winter surveys are planned.

In Bowdoin fjord, melting water from calving glacier affects the marine ecosystem. Marine fish and zooplanktons are important as feeds of seabirds and marine mammals that are important food resources for the people living around the area.
On August 2, 2022, we deployed an acoustic profiler system at a location in Bowdoin fjord to research when and how many marine organisms appear in the area (Fig. 4, 5). The profiler was deployed on the bottom of the site where the water depth was approximately 230 m (Fig. 5 shows the scene before the profiler sank to the bottom).

(Fig. 4)Acoustic profiler deployed in Bowdoin fjord
(Fig. 5)Mooring operation of acoustic profiler
(Fig. 6)Biological sampling with plankton net

Biological sampling was also carried out using a plankton net to confirm the zooplankton species that were monitored by the acoustic profiler at that time (Fig. 6). The acoustic profiler will continue to collect data for a year, and we will pick it up in summer next year. The knowledge from data of the acoustic profiler is expected to grow understanding the marine ecosystem in the area.

(2022/8/19)

Landslide Survey on Fjord Slopes in the Coastal Area of NW Greenland

Writer:Tatsuya Watanabe(Kitami Institute of Technology)
Shintaro Yamasaki (Disaster Prevention Research Institute, Kyoto University)

(Fig. 1)Landscape around Siorapaluk

TIn the Arctic region, where rapid climate change is underway, there is concern that landslides could occur more frequently due to permafrost thawing and increased rainfall. In Siorapaluk, the northernmost settlement of Greenland, many huge shallow landslides caused by heavy rain occurred in the summers of 2016 and 2017 (Fig. 1). The physical properties of the periglacial sediments, which thickly cover steep slopes, probably contribute to slope failures. In this summer’s survey, permeability tests and grain size analyses were carried out on the failed slopes to understand the mechanism of the landslides (Fig. 2). As the surface and subsurface structures in periglacial environments differ from those in temperate regions such as Japan, shallow landsliding mechanism is expected to be totally different. Thus, it is important to elucidate the detailed processes to estimate hazard risk for Arctic landslides.

(Fig. 2)Permeability test on the failed slope
(Fig. 3)Photographing geological structure with a super-telephoto lens camera

Gravitational slope deformation is developing on fjord high cliffs due to the stress changes following glacier retreat. Eventually, huge rock failures will occur, and accompanying tsunamis will hit nearby settlements. High-resolution DEM shows the possibility of gravitational slope deformation related to destabilization on fjord slopes around Qaanaaq, the largest settlement in NW Greenland. In this summer’s survey, the fjord slopes were photographed with a super-telephoto lens camera to understand the wide range of geological structures around Qaanaaq (Fig. 3). Close-up photography with a drone and visual observation from a fishing boat were also carried out, focusing on areas of slope instability (Fig. 4). We are analyzing large-landslides and induced tsunami risk by obtaining new image data.

(Fig. 4)Aerial shoot of a fjord cliff near Qaanaaq

(2022/8/3)

How Does Meltwater Come Out from a Glacier in Greenland?

Writer:Masahiro Minowa (Hokkaido University)
Ken Kondo (Hokkaido University)

The recent rapid warming caused an increase in the melting of the Greenland Ice Sheet, resulting in an increase in runoff into the ocean. However, much of the melted water may be retained by refreezing in the accumulation area of the ice sheet where ice is covered by snow, and it could be reducing the runoff. To investigate the relationships between melting, refreezing, and runoff in the Greenland Ice Sheet, we performed in-situ observations in Qaanaaq Glacier in northwestern Greenland from July 3 to 23 2022 (Fig. 1).

(Fig. 1)Qaanaaq Glacier: A river appeared on the glacier surface from the snow layer because of high temperature and large amount of snow melting

In addition to the surface mass balance monitoring which we have been continuing for a decade, we newly deployed thermistors, conductivity sensors, and geophones within a snow/ice in the accumulation area of the glacier (Figs 2 and 3). Several shallow snow/ice cores were also taken, and we found that meltwater was refrozen indeed under the snow layer (Fig. 4).

(Fig. 2)Temperature and conductivity sensors were also installed within snow/ice
(Fig. 3)Several geophones were deployed within snow
(Fig. 4)Superimposed ice under the snow layer

By comparing meltwater runoff from the glacier and the processes occurring at the accumulation area, we are going to understand how meltwater comes out from a glacier and the influence of the recent warming for the runoff from the Greenland Ice Sheet (Fig. 5).

(Fig. 5)Meltwater runoff at the terminus of Qaanaaq Glacier

(2022/7/27)

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