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  3. Investigation Of A Port Queuing System On Co2 Emissions From Container Shipping
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  3. Investigation Of A Port Queuing System On Co2 Emissions From Container Shipping

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Investigation of a port queuing system on CO2 emissions from container shipping

Rachel Rhodes1, Callie Leiphardt1, Hillary S Young2

  • 1Marine Science Institute, University of California Santa Barbara, Santa Barbara, CA 93106, USA.

Marine Pollution Bulletin
|May 20, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

New port queuing systems for container ships significantly cut carbon dioxide (CO2) emissions by enabling optimized vessel speeds and reducing offshore waiting times. This strategy offers a promising avenue for maritime decarbonization.

Keywords:
Automatic Identification SystemCO(2) emissionsClimate changeMaritime shippingPort congestionPort queuing system

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Area of Science:

  • Maritime logistics
  • Environmental science
  • Transportation engineering

Background:

  • Traditional "first-come, first-served" port systems incentivize inefficient vessel speeds, leading to significant emissions.
  • The maritime industry seeks strategies to meet decarbonization goals, but port inefficiencies remain a challenge.

Purpose of the Study:

  • To evaluate the impact of a new port queuing system on CO2 emissions from container ships.
  • To determine if optimized vessel speeds during transpacific voyages reduce emissions.

Main Methods:

  • Utilized a bottom-up emissions model with vessel specifications and Automatic Identification System (AIS) data.
  • Analyzed 10,000 voyages from 1157 container ships over 6.5 years (2017-2023).
  • Compared emissions before and after system implementation at the Ports of Los Angeles and Long Beach, using control ports for validation.

Main Results:

  • Observed 16-24% reductions in CO2 emissions per voyage after implementing the new queuing system.
  • Control ports showed moderate emissions reductions, attributed to multiple factors.
  • Identified significant variations in emissions efficiency among ocean carriers.

Conclusions:

  • The implemented port queuing system effectively reduces CO2 emissions by optimizing vessel speeds.
  • Further modifications to queuing systems could yield additional emission reductions.
  • Company-specific practices significantly influence maritime emissions efficiency.