November 28, 2017 - China Launches Satellite for Climate Monitoring

You might have the date slightly off — China launched its Fengyun-3D climate monitoring satellite on November 15, 2017, not November 28. It lifted off from the Taiyuan Satellite Launch Center aboard a Long March 4C rocket, carrying advanced instruments for greenhouse gas tracking, fire monitoring, and atmospheric sounding. The 2.5-ton satellite entered a sun-synchronous orbit at roughly 800–836 km altitude. There's much more to uncover about what FY-3D actually does.

Key Takeaways

• China launched the FY-3D meteorological satellite on November 15, 2017, not November 28, from the Taiyuan Satellite Launch Center.
• The 2.5-ton FY-3D satellite was carried by a Long March 4C rocket into a sun-synchronous orbit at approximately 800–836 km altitude.
• FY-3D carries MERSI-II, providing daily seamless global imagery at 250 m resolution across 20 spectral bands.
• The satellite monitors greenhouse gases, including CO2, using hyperspectral instruments measuring atmospheric absorption lines across near-infrared to shortwave infrared bands.
• FY-3D pairs with FY-3C to deliver twice-daily global atmospheric snapshots, supporting weather forecasting and climate research worldwide.

China's Fengyun-3D Launch on November 15, 2017

China launched the Fengyun-3D (FY-3D) satellite on November 15, 2017, at 2:35 a.m. Beijing Time from the Taiyuan Satellite Launch Center in Shanxi province.

A Long March 4C rocket carried the 2.5-ton satellite into a sun-synchronous orbit at 836 km altitude on the 254th Long March mission.

You'll notice this launch marked a significant step in satellite diplomacy — FY-3D's data now reaches 77 countries and regions, including 37 Belt and Road nations.

The satellite also became China's first to use Antarctic ground stations for data relay, transmitting 90% of its observations back to China within 80 minutes.

This capability shortens global weather forecast updates from 6 hours to just 4 hours. The Shanghai Academy of Spaceflight Technology was responsible for developing both the Fengyun-3D satellite and the Long March 4C rocket used in the mission.

FY-3D is designed to network with FY-3C, which was launched in September 2013, to make atmospheric exploration more accurate and improve national meteorological monitoring ability. Similar to how Mars Pathfinder collected nearly 10,000 surface images and 30 days of weather data to advance planetary science, FY-3D aims to build a comprehensive atmospheric dataset for long-term climate research.

How Fengyun-3D Monitors Global Greenhouse Gas Emissions?

At the heart of Fengyun-3D's climate monitoring capability sits its hyper-spectral greenhouse gas monitoring instrument, which measures column concentrations of carbon dioxide and other key greenhouse gases through atmospheric absorption lines.

It operates across four spectral bands spanning near-infrared to shortwave infrared wavelengths, enabling precise detection through refined atmospheric sounding.

Rigorous satellite calibration ensures the accuracy needed to track emission trends reliably over time.

You can think of this system as a continuous atmospheric profiler, mapping gas concentrations globally and feeding data into climate research and environmental protection efforts.

These high-accuracy measurements carry real policy implications, giving governments and international bodies the verified emission data they need to assess compliance with climate agreements and shape informed environmental legislation going forward. Fengyun-3D forms a network with three previously launched Fengyun-3 series satellites, collectively shortening the update time for global weather forecasts from six hours to four hours.

This approach mirrors earlier milestones in satellite communications, where a single orbital platform proved capable of delivering continent-wide coverage to remote and underserved regions for the first time.

The satellite was built by Shanghai Academy of Spaceflight Technology and operates in a sun-synchronous orbit at a nominal altitude of approximately 836 kilometers.

What Hyperspectral Technology Powers Fengyun-3D?

Powering Fengyun-3D's climate monitoring capability is the Medium Resolution Spectral Imager-II (MERSI-II), a hyperspectral instrument that spans visible light, near-infrared, medium-infrared, and far-infrared channels across 20 spectral bands ranging from 0.41 to 12.5 micrometers.

These hyperspectral sensors deliver infrared imaging at unprecedented precision. MERSI-II's key capabilities include:

1. 250 m resolution infrared split-window coverage — a global first
2. Daily seamless true-color global imagery at 250 m resolution
3. ±55.4° cross-track scanning covering a 2,916 km swath width
4. Atmospheric, land, and marine parameter retrieval including clouds, aerosols, and water vapor

You'll find MERSI-II's fire monitoring products equally impressive, detecting sub-pixel fire locations, temperatures, and intensities — day and night — making it indispensable for environmental and climate monitoring. Similarly, advances in space infrastructure, such as Axiom Space's commercial modules, demonstrate how environmental monitoring capacity can be expanded through dedicated solar arrays and life support systems aboard independent orbital platforms.

How Fengyun-3D Tracks Carbon Dioxide, Methane, and Carbon Monoxide?

Beyond its imaging capabilities, Fengyun-3D carries hyperspectral greenhouse gas monitoring instruments that track atmospheric carbon dioxide, methane (CH₄), and carbon monoxide (CO) with high accuracy. Using atmospheric spectroscopy, the satellite's sensors analyze reflected and emitted radiation to identify trace gases across the spectrum. You'll find that this approach enables precise emission retrieval by distinguishing each gas's unique spectral signature.

The instruments don't work in isolation—they integrate biomass data and combustion efficiency indices to sharpen emission estimates further. This multi-layered methodology lets researchers move beyond simple detection toward quantifying actual atmospheric concentrations. Fengyun-3D fire monitoring data has since been applied to study open biomass burning emissions globally, identifying savanna grassland fires as the largest contributor at 1.21 billion tonnes of carbon annually.

Southern Hemisphere Africa stands out as the single largest regional carbon source from open biomass burning, contributing an average of 847.04 teragrams annually. This geographic concentration highlights how satellite-derived data can pinpoint regional hotspots with the precision needed to inform targeted environmental and public health mitigation strategies.

How Fengyun-3D Extended the Fengyun-3 Polar-Orbiting Network?

Launched on November 14, 2017, atop a Long March 4C rocket from Taiyuan Satellite Launch Center, Fengyun-3D slotted into an 800 km afternoon polar orbit to replace the aging Fengyun-3B, which had served nearly seven years since its 2010 launch. Its addition strengthened polar continuity and boosted afternoon coverage across the constellation.

Here's how it extended the network:

1. Replaced FY-3B, restoring full afternoon orbital capacity after seven years of service.
2. Paired with FY-3C in a morning orbit, enabling twice-daily global snapshots.
3. Established groundwork for later satellites—FY-3E, FY-3F, FY-3G, and FY-3H.
4. Advanced global 3D soundings of temperature and moisture for improved weather prediction.

Together, these roles made FY-3D essential to China's evolving polar-orbiting meteorological infrastructure. Notably, FY-3D was the first Chinese remote sensing satellite to utilize Antarctic ground stations for transmit and receive operations, enabling 90% of its observations to be sent back to China within 80 minutes. FY-3D carried a broad suite of instruments, including MERSI, MWTS, and MWHS, supporting high-resolution imaging alongside microwave temperature and humidity sounding capabilities.

What Fengyun-3D's Data Reveals About Global Carbon Cycling?

Through its fire spot monitoring capabilities, Fengyun-3D has revealed that open biomass burning (OBB) releases 2,586.88 teragrams of carbon annually across 2020–2022. You'll find that emissions peak in August–September, averaging 441.32 Tg C monthly—nearly double the yearly monthly average.

The satellite's 1 × 1 km daily inventory pinpoints biomass hotspots across key regions. Southern Africa leads at 850 million tonnes annually, followed by Southern South America at 530 million tonnes and Northern Africa at 390 million tonnes. Together, these three regions account for nearly 70% of global OBB carbon emissions. Savanna grassland burning contributes the largest share of these emissions by land type, accounting for 46.74% of total global carbon output at 1,209.12 Tg C per year.

Beyond fire monitoring, FY-3D's MWRI sensor contributes to a broader understanding of land surface dynamics, as researchers have used multi-overpass FY-3 constellation data to retrieve soil temperature profiles at depths of 5, 10, 20, and 30 centimeters, capturing how heat diffuses vertically through the ground over the diurnal cycle. This work parallels planetary surface science efforts like NASA's Mars Curiosity mission, where detecting nitrogen and elemental sulfur in rock samples helped scientists identify geochemical conditions potentially suitable for microbial life.

How Fengyun-3D Connects to China's Other Weather Satellites?

Fengyun-3D's carbon monitoring work doesn't operate in isolation—it's part of a broader network of Chinese weather satellites working together to build a complete picture of Earth's systems. This LEO GEO constellation synergy gives you continuous, layered atmospheric data.

Here's how FY-3D connects to China's satellite network:

1. FY-2 GEO satellites (FY-2G, FY-2H) provide regional scans every 30 minutes, complementing FY-3D's polar passes.
2. FY-4A/B delivers full-disk imagery every 15 minutes, filling temporal gaps.
3. FY-3E adds early morning orbit coverage, achieving 6-hour global data cycles alongside FY-3D.
4. FY-3H (2024) assumes FY-3D's operational role, maintaining uninterrupted LEO contributions. FY-3H was launched aboard a Long March 4C rocket from Jiuquan Satellite Launch Center, successfully deploying the satellite into polar orbit.

Together, these 21 satellites form China's complete FY constellation, supporting global NWP and climate research. Fengyun-3D also carries a wide-field auroral imager, extending the constellation's capabilities beyond weather forecasting into space weather investigation and aurora monitoring. Much like São José dos Campos evolved from an agricultural settlement into a modern technology hub, China's Fengyun program has grown from early experimental satellites into a sophisticated global climate monitoring network.

How Fengyun-3D Contributes to Global Weather Forecasting Standards?

When you look at what makes a weather satellite truly impactful, FY-3D's contributions to global forecasting standards stand out clearly. It aligns with WMO-coordinated polar-orbiting slots, meeting international standards for AM/PM orbit coverage. This alignment ensures data interoperability across global meteorological systems, allowing institutions like ECMWF to assimilate Fengyun data directly into medium-range forecast models.

You'll also find FY-3D's reach extending to 129 countries and regions, delivering open-access standardized products for weather, climate, and environmental monitoring. It supports numerical weather prediction with global 3-D soundings and geophysical parameters, strengthening forecast accuracy worldwide. Beyond data sharing, China has trained over 1,000 international users and conducted 50+ consultations, ensuring partners can effectively apply FY-3D's products to real-world forecasting and disaster prevention needs. Since April 2018, the China Meteorological Administration has also operated an emergency support mechanism, enabling rapid satellite-based assistance to countries facing sudden-onset disasters and extreme weather events. This long-term commitment to atmospheric observation mirrors the scientific ambitions behind Canada's Arctic outposts, such as the Eureka Weather Station established on Ellesmere Island in 1947 to monitor northern climate conditions.