Discover how thermal satellite imagery reveals icebreaker corridors, assesses their recency, and uncovers escorted or AIS-degraded vessel movements around the Port of Pevek, demonstrating the unique value of Land Surface Temperature (LST) for Arctic maritime domain awareness.
The Arctic is rapidly becoming an area of growing geopolitical and economic importance, where maintaining reliable maritime access is essential for logistics, energy security, and regional operations. Yet, monitoring vessel activity in polar environments remains particularly challenging. Extended darkness, frequent cloud cover, and sea ice significantly limit the effectiveness of conventional optical satellite imagery, while AIS data can be incomplete, intentionally disabled, or unavailable.
This study explores how thermal satellite observations, through Land Surface Temperature (LST), provide a complementary source of intelligence for monitoring maritime activity around the Port of Pevek, Russia's northernmost seaport, and the Akademik Lomonosov floating nuclear power plant.
Rather than focusing solely on detecting vessels, thermal imagery reveals the physical impact that ships, particularly icebreakers, leave on the surrounding environment. As nuclear-powered icebreakers fracture consolidated sea ice, they expose relatively warmer seawater, creating distinct thermal corridors that remain visible from space. These signatures provide valuable information not only about where vessels have travelled, but also about how maritime access is actively managed.
Using a series of thermal observations acquired during the winter of 2025–2026, this study demonstrates how LST data can distinguish between simple one-time transits and sustained ice management operations. Around Pevek, icebreakers repeatedly reopen, widen, and maintain navigation corridors to ensure continued access to the port and surrounding operating areas. These maintenance activities create characteristic thermal patterns that remain observable even under low-visibility Arctic conditions.
The analysis further shows that these thermal corridors evolve over time. Newly opened channels gradually cool and refreeze, allowing analysts to estimate whether a passage is recent, actively maintained, or has been abandoned. By tracking these changes across multiple acquisitions, thermal imagery provides insight into the operational state of Arctic shipping routes without requiring continuous vessel observations.
Beyond monitoring the corridors themselves, thermal imagery also enables the identification of follow-on vessel movements. By combining corridor geometry with thermal vessel signatures and available AIS information, the study demonstrates how escorted traffic can be linked to icebreaker activity. In one example, thermal observations revealed a vessel travelling within a freshly opened corridor despite the absence of publicly available AIS data, illustrating how thermal measurements can help identify non-cooperative or AIS-degraded traffic.
These capabilities make thermal intelligence particularly valuable for Maritime Domain Awareness (MDA). Instead of relying solely on direct vessel detection, analysts can observe the environmental changes created by maritime operations, providing additional context on access creation, corridor maintenance, traffic reuse, and operational activity.
The study concludes that thermal imagery offers several unique operational advantages in Arctic environments, including the ability to:
- detect icebreaker-created and maintained navigation corridors;
- assess corridor recency through cooling and refreezing behaviour;
- monitor the reuse and maintenance of Arctic shipping routes;
- associate follow-on vessel traffic with previously established corridors;
- identify potential non-cooperative or AIS-degraded vessels travelling within maintained channels; and
- support activity-state assessments across time under conditions where optical imagery and traditional tracking methods are limited.
By turning the thermal state of sea ice into an observable operational record, Land Surface Temperature data provides a new perspective on Arctic maritime activity. Rather than replacing existing monitoring methods, thermal observations complement optical imagery, SAR, and AIS by revealing information that these data sources cannot directly measure: the creation, maintenance, and evolution of the maritime environment itself. This makes thermal intelligence an increasingly valuable tool for supporting Arctic logistics, infrastructure monitoring, and security applications.
