Pollutant emissions in major seaports likely to have spiked during the COVID-19 pandemic, study finds

Date:
November 16, 2021
Source:
Nanyang Technological University
Summary:
Researchers have modeled that pollutant emissions from the shipping
sector increased significantly in major international seaports
during the COVID-19 pandemic.



FULL STORY ========================================================================== Researchers from Nanyang Technological University, Singapore (NTU
Singapore), have modelled that pollutant emissions from the shipping
sector increased significantly in major international seaports during
the COVID-19 pandemic.


==========================================================================
The findings serve as a stark contrast against findings[1] from the
NASA Earth Observatory that the freeze in industrial processes and
human activity arising from the pandemic resulted in generally lower
air pollution.

In Singapore, the NTU research team found that emissions were modelled to
have more than doubled (123 per cent), during the pandemic period, while
they increased twofold in Los Angeles (100 per cent), almost two-thirds
(65 per cent) in Long Beach, California, and over a quarter (27 per cent)
in Hamburg, Germany.

Container ships and dry bulk carriers marked the sharpest increase of
all total emissions, seeing an average increment of 94 per cent and 142
per cent respectively, compared to before the COVID-19 pandemic.

The NTU research builds upon previous studies that signalled that COVID-19
had a substantial impact on the shipping industry. The United Nations Conference on Trade and Development[2] found that COVID-19-related
constraints on ships and crew in many ports led to workforce shortages
and operational challenges and affected productivity, while global
shipping intelligence provider S&P Global Platts[3] remarked that the unprecedented and volatile surge in cargo demand following the first wave
of the COVID-19 caused further delays at almost every seaport worldwide.

The NTU study modelled that ship emissions in all four ports increased
by an average of 79 per cent because of the prolonged turnaround time
in port, said the researchers, with extended 'hotelling' time[4] at
berth and anchorage areas as longer operational times were needed due
to pandemic-related delays.



==========================================================================
The research team's computations of pollutant emissions were from July
2020 to July 2021, which was at the height of the pandemic. The findings
were compared to the whole of 2019 which is taken as the baseline year
with business-as-usual emissions.

The pollutants studied in the research were carbon dioxide, sulphur oxide, nitrogen oxide, particulate matter, carbon monoxide and methane.

The NTU team calculated the fuel consumption and pollutant emissions of
the ships using actual ship movement data sourced through AXSMarine,
a global provider of dry, tanker and liner chartering. It provided
information of the ships, including their sailing speed, time duration, coordinates, navigational status, as well as ship-specific information
such as the name, type of carrier, and deadweight tonnage (DWT), which
is a measure of how much weight a ship can carry.

Additional information was also obtained from the various port
administration authorities where the study was done, as well as from
the intelligence arm of international UK shipping services provider
Clarksons, which provided ship specification information, such as the
ships' designed maximum speed, engine type, and rated engine power.

Professor Law Wing Keung, Adrian, from NTU's School of Civil and
Environmental Engineering, who led the study, said: "Our study
presents a review of the ship emission outlook amid the pandemic
uncertainty. Lockdown measures and other COVID-19 restrictions on
human activity have upended the landscape for the shipping sector and significantly affected the operating patterns of maritime and trade,
leading to the computed outcome revealing significant increase in
pollutant emissions in the seaports in our study." Ms Liu Jiahui, a PhD student from NTU's School of Civil and Environmental Engineering, who was
first author of the study, said: "Although they typically spend the least
time in ports, dry bulk carriers, which are merchant ships designed to transport unpackaged bulk cargo, such as grains, coal, ore, and cement, experienced the biggest increase in pollutant emissions. This is due to a combination of COVID-19 precautions at ports and the increased demand for
raw materials due to the resumption of industrial activity in the second
half of 2020, which resulted in a spike in dry bulk carriers in ports."


==========================================================================
The results of the study were published in the peer-reviewed academic journalEnvironmental Research in October.

Emissions are here to stay The study also reports the ship emission
simulations for two future COVID-19 scenarios from August 2021 to
August 2022:
* Scenario 1 assumes that the port congestion due to COVID-19
is resolved
and the port turnaround time returns to levels in 2019 before
the pandemic
* Scenario 2 assumes that the port congestion due to COVID-19
continues
next year in the same manner as the current situation in the four
major ports.

In Scenario 1, the researchers predict that there will be a high
likelihood (over 50 per cent probability) that ship emissions would
decrease by at least 34 per cent compared to the July 2020-July 2021
pandemic period.

However, in Scenario 2, substantial ship pollutant emissions are expected
to continue, with Singapore most likely (90 per cent probability) to
have a further emission increase of about 6 per cent higher, and with
a cumulative increase of 137 per cent from 2019 levels. The ports of
Hamburg, Long Beach and Los Angeles would also be likely to continue
the increase with marginally higher emissions.

The researchers attributed this outcome to the effects of ship traffic
growth, and the prolonged port turnaround time at berth and anchorage
areas, leading to longer periods of adverse impacts.

Addressing the two predictive outcomes, Prof Law added: "Our scenarios
have drawn attention to a shift in the overall emission pattern during
the pandemic period compared to pre-pandemic levels. We hope that the
results can assist in the development for countermeasures and compensatory plans to mitigate the impacts in a post-COVID future around the world, especially in the current highly volatile shipping industry. Meeting
these goals in the long run will require radical changes in ship engines
and fuel technology, the adoption of low-carbon or zero-emission energy sources, and the usage of updated technology at shore to cut down on the
time a ship takes to come and go. We are however glad to note that these innovations are already being actively pursued locally." Ms Liu added:
"We hope that our study provides policymakers with a comprehensive
emission outlook at major seaports during the pandemic period. As our
study highlights that ships emit the most pollutants during hotelling,
that is when they are berthed while awaiting either cargo load, cargo
discharge or their next voyage, this would suggest the need for suitable
policy responses and measures to mitigate the impacts of idling ships on
air quality." The team hopes to carry out further research to improve
the predictions from their model including more accurate measures of
port turnaround time and ship movements. They would also be developing
other more detailed emission scenarios and comprehensive analyses on
the pollutant emissions of the shipping industry going forward.

Notes: [1] NASA Earth Observatory. Environmental Effects of COVID-19 Quarantines (2021).

[2] United Nations Conference on Trade and Development. Review of Maritime Transport (2020).

[3] S&P Global Platts. Container volumes at Singapore port hit record
high in March, up 2.3% on year. (2021).

[4] Hotelling is the phase when ships are berthed at the wharves but
continue to emit exhaust gases while they await cargo load/discharge or
their next voyage.

========================================================================== Story Source: Materials provided by
Nanyang_Technological_University. Note: Content may be edited for style
and length.


========================================================================== Journal Reference:
1. Jiahui Liu, Adrian Wing-Keung Law, Okan Duru. Assessment of COVID-19
pandemic effects on ship pollutant emissions in major international
seaports. Environmental Research, 2021; 112246 DOI: 10.1016/
j.envres.2021.112246 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2021/11/211116103144.htm

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