I2 Observations In Remote Marine Air.pdf

acp-14-2669-2014.pdf
Preview of I2 Observations in Remote Marine Air
🔗 Source: acp.copernicus.org
📊 Size: 471 KB
📄 Pages: 10 pages
⬇️ Downloads: 25

Summary

- Objective: Investigate iodine (I2) sources and cycling in the marine boundary layer (MBL).
- Method: First I2 observations in marine air not impacted by coastal macroalgal emissions or sea ice chemistry, using atmospheric pressure chemical ionization tandem mass spectrometry at Cape Verde Atmospheric Observatory.
- Findings:
- I2 levels increased at sunset, leveled off after midnight, and decreased at sunrise, with a smaller midday maximum.
- Mixing ratios: <0.02–0.6 pmol mol−1 in May 2007 and <0.03–1.67 pmol mol−1 in May 2009.
- Nighttime I2 sea-air flux was insufficient to explain observed daytime IO levels.
- Iodocarbon measurements were also insufficient to explain daytime IO levels.
- An unknown daytime source of gas phase inorganic iodine is implied.
- Carpenter et al. (2013) proposed sea surface emissions of HOI could account for both nighttime I2 and daytime IO observations.
- Significance: Iodine chemistry impacts climate, human health, and nutrient availability. Understanding its sources and cycling is crucial.

Description

Study observes I2 at remote marine site; highlights inorganic iodine's photochemical role.

Technical Information

  • File Format: PDF
  • File Size: 471 KB
  • Pages: 10
  • Language: EN
  • Total Downloads: 25
  • Last Updated: 3 weeks ago

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