Using stars for remote sensing of the Earth's stratosphere

Area of Science:

• Atmospheric Science
• Spectroscopy
• Planetary Science

Background:

• Earth's atmospheric constituents impact climate and air quality.
• Measuring polar atmospheric constituents, especially during winter, is crucial for understanding ozone depletion.
• Previous stellar absorption methods had limitations in accuracy and simultaneous measurement capabilities.

Purpose of the Study:

• To describe a new UV-visible spectrometer system for atmospheric constituent measurement.
• To highlight the advantages of the new system for polar winter measurements and ozone loss studies.
• To demonstrate the instrument's capability for simultaneous measurement and noise reduction.

Main Methods:

• Utilized a UV-visible spectrometer system measuring stellar and planetary light absorption.
• Employed a cooled, two-dimensional Charge-Coupled Device (CCD) array detector.
• Configured the instrument for field deployment and ease of use, including nighttime measurements.

Main Results:

• The spectrometer system effectively measures atmospheric constituents via stellar absorption.
• The cooled 2D CCD array detector minimized spectral noise from scintillation and clouds.
• Simultaneous measurement of auroral light allowed for subtraction, enhancing stellar light analysis.
• The system enabled modest telescope use and accurate ozone measurements in polar winter conditions.

Conclusions:

• The new spectrometer system offers significant advantages over previous methods for atmospheric constituent analysis.
• Its capabilities are particularly beneficial for studying polar winter atmospheric chemistry and ozone loss.
• The instrument's design facilitates accurate and simultaneous measurements in challenging environments.