The achievement was not simply a numerical record. By spreading instruments across multiple ice sites, the expedition aimed to collect observations that show how the Arctic atmosphere, sea ice, upper ocean and under-ice ecosystem change together.

Why the stations were placed north of 82°N

All 12 Xuelong stations were located north of 82°N. Researchers selected thicker sea ice because equipment installed on the surface needed to remain in operation for longer as the summer melt season progressed. The heavier ice conditions made the higher-latitude sites more suitable for unattended instruments, even though they also made the fieldwork more demanding.

This explains the expedition’s timing as well. Because the ice in the operating area was relatively heavy, the team adjusted the station schedule to begin in late July.

What the 12-site network was designed to measure

The team deployed more than 30 ice-based instruments, including sea-ice mass-balance buoys, ice-based shallow-water and deep-water profiling buoys, and sea-ice drift buoys.

The stations also supported observations across several connected parts of the Arctic system:

• the atmospheric boundary layer;
• sea-ice physics and mass balance;
• ocean conditions beneath the ice; and
• under-ice ecology.

Together, these measurements are intended to provide long-duration, in-situ observations and validation data for studying the coupled atmosphere–ice–ocean system as Arctic sea ice changes rapidly. A denser network also gives researchers more spatial coverage than a conventional single-vessel operation, which typically establishes about six working ice stations.

The practical value is improved comparison. Researchers can examine whether changes observed in the atmosphere correspond with changes in ice thickness, ocean conditions or biological activity at different sites. Those observations can help clarify the mechanisms of rapid Arctic change and improve the data available for climate prediction.

How Xuelong 2 will extend the network

The second research icebreaker, Xuelong 2, was scheduled to continue the survey near 84°N with six short-term ice stations and one long-term station. Its plan included more than 20 operations, such as deploying ice-based buoys, collecting snow, ice-core and under-ice-water samples, conducting sea-ice remote sensing, profiling the atmosphere and measuring under-ice ocean conditions.

The two vessels’ station locations were planned to work together as an observation array. That coordination is intended to broaden the network’s geographic coverage and support closer study of interactions among the atmosphere, sea ice, ocean and ecosystem in the central Arctic.

A 1.3-meter sea-ice block for ship-design research

The expedition also collected a large sea-ice sample for mechanical testing. Over about six hours, researchers used an ice-core drill and a chainsaw to remove a block measuring 1.3 meters thick and 1.2 meters by 1.2 meters across.

Scientists will measure the sample’s mechanical properties under Arctic conditions. The work adds to the expedition’s sea-ice sample archive and will provide experimental data relevant to the structural design of next-generation polar vessels.

Domestic instruments enabled automated monitoring

The ice-station work also created an unattended Arctic observation network and tested marine-observation systems developed in China. Among the most widely deployed equipment—ice-based shallow-water and deep-water profiling buoys and sea-ice drift buoys—the average domestic content exceeded 90 percent.

That equipment base made it possible to deploy instruments in larger arrays and link them into an automated monitoring network rather than relying only on measurements collected while researchers were physically on the ice. The result is a shift toward repeated, distributed observations that can continue after the research vessel moves on.

What the ecological unmanned ice station adds

One of the expedition’s distinctive deployments was an ecological unmanned ice station, described as the system’s first Arctic application demonstration. It combines acoustic, optical and electrical sensors to observe the atmosphere, ice, ocean and ecology over longer periods.

The system is intended to follow biological activity beneath the ice through the seasonal change in light. Continuous observations could help scientists investigate how under-ice organisms persist during polar night and how they respond when polar day returns.

That matters because short summer surveys can miss processes that occur during the rest of the year. An unattended station can connect observations across changing light, ice and ocean conditions, giving researchers a more complete view of how the under-ice ecosystem responds to its environment.

The larger significance

Xuelong’s 12 stations represent a change in observation strategy as much as a record in station count. A single ship operating at 12 sites, followed by Xuelong 2’s planned seven additional stations, creates a broader platform for comparing conditions across the central Arctic.

The resulting measurements will not by themselves answer every question about Arctic change. Their value lies in combining many kinds of evidence—ice samples, drifting buoys, atmospheric profiles, ocean observations and ecological sensors—over different locations and time periods. That combination can help researchers test models against real conditions, identify how the atmosphere, ice, ocean and biology interact, and improve understanding of a rapidly changing Arctic.

The achievement was not simply a numerical record. By spreading instruments across multiple ice sites, the expedition aimed to collect observations that show how the Arctic atmosphere, sea ice, upper ocean and under-ice ecosystem change together.

Why the stations were placed north of 82°N

All 12 Xuelong stations were located north of 82°N. Researchers selected thicker sea ice because equipment installed on the surface needed to remain in operation for longer as the summer melt season progressed. The heavier ice conditions made the higher-latitude sites more suitable for unattended instruments, even though they also made the fieldwork more demanding.

This explains the expedition’s timing as well. Because the ice in the operating area was relatively heavy, the team adjusted the station schedule to begin in late July.

What the 12-site network was designed to measure

The team deployed more than 30 ice-based instruments, including sea-ice mass-balance buoys, ice-based shallow-water and deep-water profiling buoys, and sea-ice drift buoys.

The stations also supported observations across several connected parts of the Arctic system:

• the atmospheric boundary layer;
• sea-ice physics and mass balance;
• ocean conditions beneath the ice; and
• under-ice ecology.

Together, these measurements are intended to provide long-duration, in-situ observations and validation data for studying the coupled atmosphere–ice–ocean system as Arctic sea ice changes rapidly. A denser network also gives researchers more spatial coverage than a conventional single-vessel operation, which typically establishes about six working ice stations.

The practical value is improved comparison. Researchers can examine whether changes observed in the atmosphere correspond with changes in ice thickness, ocean conditions or biological activity at different sites. Those observations can help clarify the mechanisms of rapid Arctic change and improve the data available for climate prediction.

How Xuelong 2 will extend the network

The second research icebreaker, Xuelong 2, was scheduled to continue the survey near 84°N with six short-term ice stations and one long-term station. Its plan included more than 20 operations, such as deploying ice-based buoys, collecting snow, ice-core and under-ice-water samples, conducting sea-ice remote sensing, profiling the atmosphere and measuring under-ice ocean conditions.

The two vessels’ station locations were planned to work together as an observation array. That coordination is intended to broaden the network’s geographic coverage and support closer study of interactions among the atmosphere, sea ice, ocean and ecosystem in the central Arctic.

A 1.3-meter sea-ice block for ship-design research

The expedition also collected a large sea-ice sample for mechanical testing. Over about six hours, researchers used an ice-core drill and a chainsaw to remove a block measuring 1.3 meters thick and 1.2 meters by 1.2 meters across.

Scientists will measure the sample’s mechanical properties under Arctic conditions. The work adds to the expedition’s sea-ice sample archive and will provide experimental data relevant to the structural design of next-generation polar vessels.

Domestic instruments enabled automated monitoring

The ice-station work also created an unattended Arctic observation network and tested marine-observation systems developed in China. Among the most widely deployed equipment—ice-based shallow-water and deep-water profiling buoys and sea-ice drift buoys—the average domestic content exceeded 90 percent.

That equipment base made it possible to deploy instruments in larger arrays and link them into an automated monitoring network rather than relying only on measurements collected while researchers were physically on the ice. The result is a shift toward repeated, distributed observations that can continue after the research vessel moves on.

What the ecological unmanned ice station adds

One of the expedition’s distinctive deployments was an ecological unmanned ice station, described as the system’s first Arctic application demonstration. It combines acoustic, optical and electrical sensors to observe the atmosphere, ice, ocean and ecology over longer periods.

The system is intended to follow biological activity beneath the ice through the seasonal change in light. Continuous observations could help scientists investigate how under-ice organisms persist during polar night and how they respond when polar day returns.

That matters because short summer surveys can miss processes that occur during the rest of the year. An unattended station can connect observations across changing light, ice and ocean conditions, giving researchers a more complete view of how the under-ice ecosystem responds to its environment.

The larger significance

Xuelong’s 12 stations represent a change in observation strategy as much as a record in station count. A single ship operating at 12 sites, followed by Xuelong 2’s planned seven additional stations, creates a broader platform for comparing conditions across the central Arctic.

The resulting measurements will not by themselves answer every question about Arctic change. Their value lies in combining many kinds of evidence—ice samples, drifting buoys, atmospheric profiles, ocean observations and ecological sensors—over different locations and time periods. That combination can help researchers test models against real conditions, identify how the atmosphere, ice, ocean and biology interact, and improve understanding of a rapidly changing Arctic.