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Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
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Advancing shipping NO pollution estimation through a satellite-based approach.

Zhenyu Luo1, Tingkun He1, Wen Yi1

  • 1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.

PNAS Nexus
|December 25, 2023
PubMed
Summary

A new satellite model (SAT-SHIP) estimates ship nitrogen oxides (NOx) emissions and their impact on air quality in China. It accurately quantizes shipping

Keywords:
air quality impactssatellite observationshipping emission

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Remote Sensing

Background:

  • Estimating shipping nitrogen oxides (NOx) emissions and their impact on ambient nitrogen dioxide (NO2) concentrations is challenging.
  • Traditional methods are often time-consuming and complex.
  • Accurate quantification is crucial for effective air pollution mitigation strategies.

Purpose of the Study:

  • To develop and validate a satellite-based ship pollution estimation model (SAT-SHIP).
  • To estimate regional shipping NOx emissions in China.
  • To assess the contribution of shipping emissions to ambient NO2 concentrations in key Chinese regions.

Main Methods:

  • Development of the SAT-SHIP model, integrating satellite observations with wind pattern data.
  • Application of top-down emission inversion methods enhanced by satellite data.
  • Estimation of shipping NOx emissions for 17 Chinese ports.
  • Comparison of SAT-SHIP results with a traditional bottom-up approach.

Main Results:

  • SAT-SHIP demonstrated comparable performance to the bottom-up approach, achieving an R² value of 0.8.
  • Estimated shipping NOx emissions for 17 ports in China.
  • The shipping sector contributes approximately 21% to NO2 concentrations in the Yangtze River Delta.
  • Shipping contributes around 11% to NO2 concentrations in the Pearl River Delta.

Conclusions:

  • The SAT-SHIP model provides a reliable method for estimating shipping NOx emissions and their impact on ambient NO2.
  • Satellite-based estimations offer a valuable alternative to traditional methods.
  • Findings provide critical data for policymakers to address shipping-related air pollution in China.