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Related Experiment Video

Updated: May 21, 2026

Laboratory Simulation of an Iron(II)-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria

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Possible source of intermediate ions over marine environment.

Sunil D Pawar¹, V Gopalakrishnan

¹Thunderstorm Dynamics Program, Indian Institute of Tropical Meteorology, Pune 411008, India.

Thescientificworldjournal

|June 16, 2012

Summary

Marine atmospheric ions were measured during the Arabian Sea Monsoon Experiment (ARMEX). Intermediate ions likely form from small ions attaching to ultrafine particles from the upper troposphere, impacting the marine boundary layer.

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Area of Science:

Atmospheric Chemistry
Marine Aerosol Science
Ion Physics

Background:

Understanding marine atmospheric ions is crucial for air quality and climate studies.
Previous research has explored ion dynamics in various environments, but specific mechanisms over the Arabian Sea during monsoon periods require further investigation.

Purpose of the Study:

To investigate the concentrations and correlations of small, intermediate, and large ions in the marine boundary layer over the Arabian Sea.
To identify the primary sources and formation mechanisms of intermediate ions in this region.

Main Methods:

In-situ measurements of small, intermediate, and large ion concentrations were conducted onboard the ORV Sagarkanya.
Data analysis involved calculating daily averages and correlation coefficients between ion concentrations and sea surface pressure.
Statistical analysis was employed to determine the significance of observed correlations.

Main Results:

A weak positive correlation (r=0.14) was found between intermediate and large ion concentrations, suggesting different origins.
A significant negative correlation was observed between small and intermediate ion concentrations.
Intermediate ion concentration showed a strong positive correlation (r=0.58) with sea surface pressure.

Conclusions:

The findings suggest that intermediate ions are primarily formed by the attachment of small ions to ultrafine particles transported from the upper troposphere into the marine boundary layer.
This process is supported by the observed correlations with sea surface pressure and the entrainment of aerosol particles from the free troposphere.