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Global Atmospheric Composition Effects from Marine Isoprene Emissions.
Wentai Zhang1,2, James Weber3,4, Alex T Archibald2,5
1Division of Environment and Sustainability, Hong Kong University of Science and Technology, Hong Kong, China.
Environmental Science & Technology
|February 3, 2025
Summary
Marine isoprene emissions significantly impact atmospheric chemistry and climate. This study models these emissions globally, revealing their ascent to the upper troposphere and influence on atmospheric composition.
Area of Science:
- Atmospheric Chemistry
- Climate Science
- Oceanography
Background:
- Isoprene emissions, mainly biogenic, affect atmospheric chemistry and climate.
- Marine isoprene's atmospheric role is poorly understood due to limited data and complex ocean mechanisms.
Purpose of the Study:
- To globally model marine isoprene concentrations and emissions.
- To investigate the atmospheric implications of marine isoprene.
- To understand isoprene's role in atmospheric composition changes.
Main Methods:
- Utilized 20 years of MODIS satellite data.
- Uscaled laboratory-derived isoprene production/loss rates.
- Employed Earth system model simulations.
Main Results:
- Global modeling of aqueous isoprene concentrations and emissions.
- Demonstrated significant alterations in atmospheric composition over oceans.
- Revealed diurnal variations in isoprene vertical profiles.
Conclusions:
- Marine isoprene ascends to the mid-to-upper troposphere.
- Nitrogen monoxide (NO) differentially affects isoprene epoxydiol (IEPOX) production.
- Highlights the need for including marine isoprene in climate models for a changing climate.
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