Monitoring greenhouse gas emissions from ships in the Great Lakes-St. St. Lawrence Seaway
A new study from the International Council on Clean Transportation (ICCT) estimates that ships in the Great Lakes-St. Lawrence Seaway (GL-SLS) consumed over 500,000 tonnes of fuel and emitted over 1.6 million tonnes (Mt) of CO2 in 2019. The new extended emissions inventory for 2019 also shows that ships flying the flags of the United States and Canada were together responsible for nearly 80% of total CO2 emissions, each about 40%.
While ships flying the flag of the Marshall Islands ranked second in terms of the number of ships in the GL-SLS, they emitted less CO2 than ships flying the US flag. “Knowing the number of vessels doesn’t tell you a lot, and it underscores the importance of more granular analyzes like this that help us understand vessel activity,” said Zhihang Meng, marine program associate researcher of the ICCT and co-author of the background paper published today. .
Although the St. Lawrence Seaway portion represents less than 1% of the geographic area of the entire GL-SLS, it hosted 25% of the CO2 CO emissions in 2019 and had an average CO2 emissions intensity 36 times greater than that of the Great Lakes. By vessel type, most emissions in GL-SLS were from bulk carriers, approximately 1 Mt or 62% of total CO2and they were followed by chemical tankers, responsible for about 10% of total emissions, and tugs, which accounted for about 9%.
“This inventory can be a reference for various stakeholders, including governments, ports and community groups, in their efforts to reduce air pollution and mitigate the climate impacts of shipping in the region,” said Bryan Comer, Ph.D., ICCT marine program manager and co-author of the study. “Such actions could include promoting the use of shore power, on-shore or barge-based emissions capture hoods, batteries, fuel cells, low-carbon fuels (measured on life cycle basis), wind-assisted propulsion, etc.
ICCT intends to periodically update the analysis of this important commercial waterway as more recent data becomes available. Additional data is also published with the study: a statistical file with details of non-CO emissions2 the climate and atmospheric pollutants including methane (CH4), carbon black, sulfur oxides (SOX), particles and more; and an ArcGIS shapefile with the mesh CO2 emission inventory for GL-SLS at 0.05° x 0.05° resolution. The emission factors used were the same as those used in the IMO’s fourth greenhouse gas study, except for ships that use heavy fuel oil with scrubbers. In the case of a ship equipped with a scrubber, the emission factors developed by the ICCT were applied.
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Article: theicct.org/publication/ships- … kes-emissions-mar22/
Provided by the International Council on Clean Transportation
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