Boundary layer halogens in coastal Antarctica
Alfonso Saiz-Lopez1, Anoop S Mahajan, Rhian A Salmon
1School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK.
Science (New York, N.Y.)
|July 21, 2007
Summary
Antarctic iodine and bromine oxides are present year-round, impacting climate. Highest ever recorded iodine oxide levels cause significant ozone depletion and rapid oxidation of other compounds.
Area of Science:
- Atmospheric Chemistry
- Climate Science
- Environmental Science
Background:
- Halogens significantly influence tropospheric oxidizing capacity.
- Iodine oxides contribute to ultrafine aerosol formation with potential climate implications.
Purpose of the Study:
- To report year-round measurements of boundary layer iodine oxide and bromine oxide in Antarctica.
- To investigate the seasonal cycles and concentrations of these halogen species.
Main Methods:
- Continuous measurements of iodine oxide and bromine oxide were conducted at Halley Station, Antarctica.
- Data collection spanned a full year, focusing on the sunlit period.
Main Results:
- Both iodine oxide and bromine oxide were detected throughout the sunlit year.
- These species displayed similar seasonal patterns and concentrations.
- Springtime iodine oxide peaked at 20 parts per trillion, a record atmospheric concentration.
- Observed halogen levels led to substantial ozone depletion.
- Rapid oxidation of dimethyl sulfide and mercury was noted in the Antarctic boundary layer.
Conclusions:
- Halogen oxides play a crucial role in Antarctic atmospheric chemistry.
- The high concentrations observed have significant implications for ozone levels and the oxidation of key trace gases.
More Related Videos
13:38Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
Published on: October 26, 2019
10:28Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
Published on: June 13, 2020
Related Concept Videos
02:39Phase Transitions: Melting and Freezing
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
01:28Magnetostatic Boundary Conditions
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
01:18Boundary Layer Characteristics
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
01:17Graphs of Polar Equations
The polar coordinate system represents points using a distance from a central point (the pole) and an angle from a reference direction (the polar axis). Unlike rectangular coordinates, polar coordinates are ideal for graphing curves with radial symmetry or periodic behavior.Some general forms of graphs in polar coordinates include the following:Equation of a Circle (Centered at the Pole):A graph where the radius remains constant for all angles traces a circle centered at the pole:Equation of a...
01:18Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...