Peatland fires are burning across drought-affected regions of Indonesia, producing dense smoke plumes visible from satellite imagery and degrading air quality across parts of Southeast Asia, according to observations from NASA’s Aqua satellite released this month. The fires are concentrated in established peatland zones, where organic soils have dried out sufficiently to sustain both surface blazes and slower-burning subsurface combustion.
NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS), carried aboard the Aqua satellite, captured images documenting widespread fire activity across Indonesian peatland areas. The instrument has been a primary tool for tracking fire distribution in equatorial Asia for more than two decades. Alongside visible smoke detection, NASA and partner agencies rely on infrared data to locate active peat fire zones, since subsurface smoldering burns at lower temperatures than typical forest fires and can escape standard thermal detection.
Peat soils, formed from partially decomposed organic matter accumulated over thousands of years, store substantial amounts of carbon. When drained for plantation use or desiccated by extended drought, the dried material becomes highly flammable and capable of smoldering for weeks or months. The combination of Indonesia’s prolonged dry season and recurring land-clearing practices in some regions has historically made the country a recurring source of transboundary haze, with documented impacts on air quality in Singapore, Malaysia, and Thailand during severe fire seasons.
What happened
Satellite imagery obtained this month shows active fire detections clustered in Indonesian peatland regions that have historically produced the largest haze events. The images indicate both surface flaming and the more persistent subsurface burning characteristic of drained peat. Smoke plumes extending from the fire zones have affected visibility and air quality in nearby populated areas, though the full extent of ground-level pollution concentrations across the region will depend on wind patterns, fire duration, and proximity of populated centers to active burning areas.
NASA has not, in the materials reviewed for this report, specified the precise provinces affected in the current episode or the total area burned. The agency routinely publishes fire detection data through its Worldview and Fire Information for Resource Management System (FIRMS) platforms, which allow researchers and regional authorities to monitor active burning in near real time.
Why it matters
Peat fires differ from typical forest fires in ways that amplify their environmental and public health consequences. They burn more slowly but can persist for months, releasing continuous streams of carbon dioxide, carbon monoxide, methane, and fine particulate matter. Because the combustion can occur beneath the surface, peat fires are difficult to detect in their early stages and harder to extinguish once established. Water tables must be raised and the peat rewetted to fully suppress smoldering zones, a process that can take sustained hydrological intervention.
The 2015 peat fire episode in Indonesia released an estimated 1.75 billion tons of carbon dioxide according to a 2016 analysis published in Environmental Research Letters, making it one of the largest single-year carbon emissions events of the twenty-first century on a country basis. The 2019 episode produced comparable, though somewhat smaller, emission totals and similarly severe transboundary haze. Both episodes triggered international diplomatic friction, public health advisories across multiple countries, and renewed scrutiny of plantation industry practices in concession areas on peat soils.
Public health authorities in affected countries typically respond to major peat fire seasons by issuing air quality advisories, distributing masks, and, in severe episodes, closing schools. The 2015 haze led to more than 100,000 reported respiratory illnesses in Indonesia, Malaysia, and Singapore according to figures later compiled by the World Health Organization. Economic disruption during major events has included flight cancellations, reduced tourism receipts, and decreased agricultural productivity in haze-affected provinces.
Background and context
Indonesia’s peatlands are among the largest in the tropics, with an estimated extent of more than 20 million hectares according to historical mapping efforts, though drainage, degradation, and land-use change have substantially reduced intact areas. The country became the world’s largest producer of palm oil, a commodity whose expansion has been linked by environmental researchers to the conversion of peat swamp forest into plantation estates. Pulpwood plantations for paper and rayon production have followed a similar pattern in some regions.
The 2015 haze crisis became a turning point for international engagement on Indonesian peat fires. In 2014, the Indonesian government established the Peatland Restoration Agency (BRG, later BRGM), tasked with restoring degraded peatlands through rewetting and revegetation. The 2015 fires also accelerated a 2014 moratorium on new peatland concession permits and contributed to negotiations that led to the 2014 ASEAN Agreement on Transboundary Haze Pollution’s full ratification by Indonesia in 2014, having signed in 2002.
Enforcement of land-clearing bans has remained uneven, and environmental groups have documented recurring fires inside concession areas even during years with less severe drought. Researchers have linked fire occurrence in peatland regions to drainage depth, with deeper drainage canals producing more vulnerable landscapes.
What to watch next
Several indicators will shape the trajectory of the current and upcoming fire seasons:
– Satellite-detected fire counts. Continued monitoring through NASA’s MODIS and the VIIRS instrument aboard the Suomi NPP and NOAA-20 satellites will provide the most reliable measure of fire extent. Persistent high counts across multiple weeks would suggest an emerging major episode rather than a localized event.
– Air quality measurements. Readings from ground-based monitoring stations operated by Indonesia’s BMKG and environmental agencies in Singapore, Malaysia, and Thailand will indicate the public health dimension. Singapore’s National Environment Agency and Malaysia’s Department of Environment publish hourly pollutant data during haze episodes.
– Peat moisture and water table levels. The Indonesian Peat Prize and ongoing hydrological restoration projects have generated water table data for major peat domes. Drops in water table to more than 40 centimeters below the surface substantially increase fire risk according to restoration research.
– Diplomatic and enforcement responses. Cross-border haze complaints and renewed scrutiny of concession holders have historically followed major episodes. Statements from ASEAN ministers and Indonesia’s Ministry of Environment will signal the policy response.
– Climate conditions. The Indonesian Meteorological, Climatological and Geophysical Agency’s seasonal outlook and longer-term projections from the IPCC will inform expectations for the remainder of the dry season.
Analysis: The recurring pattern of Indonesian peat fires illustrates how land-use decisions made decades ago continue to shape present-day climate and public health outcomes. Drainage canals installed to make peatlands accessible for plantation agriculture have left a landscape vulnerable to ignition during drought. Restoration through canal blocking and rewetting has shown promise in pilot projects, but scaling these interventions across the remaining peat estate remains a long-term undertaking requiring sustained funding, institutional capacity, and coordination across multiple levels of government.
Analysis: Climate models have consistently projected longer and more intense dry seasons across equatorial Asia under continued warming, suggesting that the meteorological conditions enabling severe peat fire episodes will recur with greater frequency. Adaptation responses, including rewetting, fire prevention patrols, and concession monitoring, will determine whether the next major drought produces a fire episode on the scale of 2015 and 2019, or a more manageable event. International cooperation on early warning and financing for restoration has expanded since the 2015 crisis, but measurable progress on the ground remains difficult to verify.
Conclusion
The peat fires now visible in NASA satellite imagery represent a continuation of a pattern that has affected Southeast Asia repeatedly over the past three decades. The combination of drained peatlands, recurring drought, and incomplete enforcement of land-clearing restrictions has produced a recurring cycle of haze, public health impacts, and substantial carbon emissions. Whether the current episode develops into a major regional event or remains within the range of typical annual burning will depend on weather conditions over the coming weeks and the effectiveness of preventive measures in fire-prone concession areas. The longer-term trajectory depends on the pace of peatland restoration and the integration of fire prevention into climate and land-use policy across the region.
Sources
NASA Science: https://science.nasa.gov/missions/aqua/peatland-fires-darken-skies-in-indonesia/
Source: NASA News
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Story synopsis gathered from: NASA News — source
