Kexue’s Western Pacific Mission Combined Typhoon Monitoring With Climate and Seafloor Research

The Chinese Academy of Sciences research vessel Kexue returned to Qingdao after a 35-day Western Pacific expedition covering 5,845 nautical miles. Rather than focusing on a single experiment, the cruise combined storm observation, physical oceanography, marine ecology, seawater chemistry and seafloor geology to build a broader picture of how the region influences climate and maritime conditions.

Two connected scientific questions

The expedition centered on two linked areas of research:

• How Western Pacific current systems and warm-pool variability affect climate and the marine environment.
• How the region’s complex geological evolution affects its resources and surrounding environment.

The Western Pacific warm pool is especially important to this work because changes in warm surface waters and circulation can influence air–sea exchange and the development of weather systems. Kexue’s observations were designed to examine those connections alongside longer-term environmental change.

A multidisciplinary observing campaign

Researchers used a range of instruments and sampling methods to study the water column, atmosphere, ecosystems and seabed. These included:

• Full-depth CTD profiles to measure conductivity, temperature and depth-related ocean conditions.
• Box cores and gravity cores to investigate sediments and geological history.
• Langya profiling floats, drifting buoys and underwater gliders to extend observations through the ocean and across changing conditions.
• Water sampling for physical, biological and chemical analysis.

Together, these tools allowed the team to examine air–sea interaction, physical oceanography, marine ecology, seawater chemistry and geological processes as parts of the same system rather than as isolated subjects.

Typhoons provided a real-time test

During the cruise, Kexue observed Typhoons Bavi, Noul and Dolphin. The work contributed to a real-time, three-dimensional ocean–atmosphere observation capability, with researchers documenting changes in the coupled boundary layer as storms passed.

The expedition reported measurements including pressure near 996 hPa, winds of about 15 meters per second and peak hourly rainfall of roughly 500 millimeters. These observations are valuable because storm intensity depends not only on the atmosphere but also on how the cyclone interacts with the upper ocean and the air–sea boundary layer.

The broader goal is not to suggest that one cruise can transform forecasting on its own. Instead, observations collected during storms can add detail to forecasting systems and help researchers test how well models represent ocean–atmosphere coupling. The expedition’s data are intended to support more accurate typhoon prediction and safer maritime operations.

Water samples targeted climate and El Niño research

Kexue also carried out targeted sampling linked to the possibility of an unusually strong El Niño. The team collected more than 900 liters of subsurface water and 8,000 liters of surface water for laboratory analysis.

The planned measurements include:

• Temperature and salinity
• pH and dissolved oxygen
• Chlorophyll and sulfides
• Chlorofluorocarbons
• Polycyclic aromatic hydrocarbons, or PAHs
• Mercury
• Radioactive isotopes

Researchers plan to compare the new samples with 14 years of previous data. That comparison can help place current conditions in a longer-term context and clarify how ocean changes relate to climate variability, marine environmental conditions and storm behavior.

Why the expedition matters

Kexue’s mission produced a combined dataset rather than a single headline discovery. Its value lies in bringing together observations that are often collected separately: measurements of currents and warm water, storm-time air–sea conditions, biological and chemical indicators, and records of seafloor change.

The immediate applications identified for the data include climate research, typhoon forecasting, navigation safety and maritime decision-making. The results will depend on subsequent laboratory analysis and comparison with earlier observations, so the cruise should be understood as a major observing effort and evidence-gathering phase—not as a completed forecast model or final climate assessment.