On the inconsistency and revision of Carbon Intensity Indicator for cruise ships. (May 2023)

• Record Type: Journal Article
• Authors: Braidotti, Luca; Bertagna, Serena; Rappoccio, Ruben; Utzeri, Samuele; Bucci, Vittorio; Marinò, Alberto
• Is Part Of: Transportation research. Volume 118(2023)
• Publication Date: 2023-05
• Subjects: Cruise market -- Cruise ships -- Carbon Intensity Indicator -- GHG emissions -- Correction of CII; Transportation -- Research -- Periodicals; Transportation -- Environmental aspects -- Periodicals; 354.76
• DOI: 10.1016/j.trd.2023.103662
• Languages: English
• ISSNs: 1361-9209

Abstract

Highlights: Carbon Intensity indicator is an important instrument to monitor maritime emissions. Current CII lead to inconsistencies between value and emissions for cruise ships. Relevant hotel load and time in port are the main cause of CII inconsistencies. Data-driven correction accounting for time in port/at sea can solve the issue. 125 cruise ship records (operative/forecasted) are used to define the correction. Abstract: The Carbon Intensity Indicator (CII) is one of the major instruments to assess the CO2 emissions coming from ship operations. Thus, it has a strong impact on the decisions taken by cruise companies regarding fleet allocation and itineraries planning. Although the CII works well with cargo vessels, it leads to misleading results when applied to cruise ships since the hotel load of a cruise ship is comparable to propulsion power. This leads to an inconsistency between emissions and CII values, which foster the adoption of itineraries having a higher environmental footprint. Here, a data-driven correction of the CII for cruise ships is proposed to remove the dependence of CII from the time at port/at sea. The correction is determined using a database relating to operative and forecasted emissions of a large fleet of cruise ships. The application to a medium-size cruise ship proves the potential of the proposed methodology.