Container ship · Liberia flag · built 2007

GSL MERCER: CO₂ emissions 2018–2025

IMO 9337274 EU ETS4 reporting years

CO₂ reported 2025: 3,301 t
Fuel burned: 1,054 t
Time at sea: 819 h
Emitted at berth: 1% of total
Share of year under way: 9%
Gross tonnage: 28,616

GSL MERCER against its type

Built in 2007, it is 1 year older than the median container ship on this register, which was built in 2008 (3,088 vessels with a known build year). At 28,616 gross tonnage it is smaller than 65% of the other 3,000 container ships with a recorded tonnage. It is one of 976 container ships here under the Liberia flag, 27.9% of the 3,495 on the register. The same builder is recorded for 983 other vessels here, 86 of them container ships. Zeaborn Ship Management is linked to 56 vessels on this register. Its MRV returns name it MOZART for 2018–2020 and GSL MERCER for 2025. The returns for 2018–2025 all give Monrovia as port of registry.

Its 3,301 t of CO₂ for 2025 is 80% below the median of 16,359 t among the 2,234 container ships on this register that reported for 2025. Per nautical mile it emitted 329.9 kg CO₂, 40% below the type median of 545.6 kg. It logged 819 hours at sea against a median of 3,155 hours for its type that year. 1.4% of its 2025 emissions were at berth; the median for container ships was 3.2%. Across 4 years with reported emissions, the highest was 2018 (19,361 t) and the lowest 2020 (1,203 t). Its efficiency percentile within the type went from 82 in 2018 to 79 in 2019 (lower is more efficient). Of the 8 sister ships listed below with a 2025 return, 5 reported a lower CO₂ per nautical mile than this vessel.

Emissions by year2018–2025

Year	CO₂ (t)	Fuel (t)	Distance (nm)	At sea (h)	At berth (t)	kg CO₂/nm	EEOI	Percentile
2025	3,301	1,054	—	819	47	329.9	26.4	not ranked
2020	1,203	386	—	280	5	330.3	11.1	not ranked
2019	14,798	4,720	35,131	4,134	307	421.2	30.5	79
2018	19,361	6,183	44,762	3,017	535	432.5	36.8	82

Vessel particulars

IMO number: 9337274
Previously reported as: MOZART
Ship type: Container ship
Gross tonnage: 28,616
Length overall: 222.1 m
Year built: 2007
Flag state: Liberia per EU MRV 2025
Builder: HD Hyundai Mipo
Port of registry: Monrovia MRV 2025
Home port: Monrovia
Technical efficiency (design): EEXI (16.62 gCO₂/t·nm)
Operator: Zeaborn Ship Management
Efficiency ranking: Not ranked: transport work below the floor (2025)
Verifier: RINA HELLAS LTD, Greece
Accreditation: 1325
Compliance document issued: 2026-06-08
Compliance document expires: 2027-06-30

Reported CO₂ by year

Reported CO₂ in 2025 was 83.0% lower than in 2018, for EU/EEA voyages only. No return is recorded for 2021, 2022, 2023, 2024, so the series has gaps.

From 2020 to 2025, emissions rose 174.4% and CO₂ per nautical mile fell 0.1%.Distance is missing for at least one of the two years, so activity and efficiency cannot be separated here.

Where the 2025 emissions occurred

Methane, nitrous oxide and EU ETS2025

Total CO₂ equivalent: 3,353 t
Methane (CH₄): 0.05 t
Nitrous oxide (N₂O): 0.19 t
Under EU ETS: 1,846 t, 56% of total

Verifier history

From reporting year	Verifier	Accredited in
2018	VERIFAVIA (UK) LTD	United Kingdom
2019	DNV	Germany
2025	RINA HELLAS LTD	Greece

A change of verifier is not in itself a sign of anything being wrong.

Sources and how to read this

Emissions: EU MRV publication (THETIS-MRV), reporting years 2018–2025, published by the European Commission.
Vessel particulars: Wikidata (CC0) and Wikimedia Commons.

This page draws on 4 MRV reporting years, 5 of 5 vessel particulars, a name history and a licensed photograph. Not found in the sources for this vessel: an efficiency ranking, AIS movements in Norwegian waters, a sanctions listing and US port state inspections.

Empty means unreported, never zero. How EEOI, distance, percentiles and sister ships are handled is explained under reading a vessel page. Something wrong? See corrections.