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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
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Sub-Ocean: Subsea Dissolved Methane Measurements Using an Embedded Laser Spectrometer Technology.

Roberto Grilli1, Jack Triest1, Jérôme Chappellaz1

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We developed a new Sub-Ocean probe for continuous, in situ measurement of dissolved methane in seawater. This instrument offers fast response times and a wide dynamic range, enabling detailed 3D mapping of methane concentrations in marine environments.

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Area of Science:

  • Oceanography
  • Environmental Science
  • Analytical Chemistry

Background:

  • Dissolved methane in seawater is a critical biogeochemical parameter.
  • Accurate and continuous in situ measurement of methane is challenging.
  • Existing methods often lack fast response times for detailed mapping.

Purpose of the Study:

  • To introduce a novel instrument, the Sub-Ocean probe, for in situ and continuous dissolved methane measurements.
  • To evaluate the instrument's performance, including response time, dynamic range, and accuracy.
  • To demonstrate the probe's capability for 3D mapping and vertical profiling of methane in seawater.

Main Methods:

  • Utilized an optical feedback cavity enhanced absorption technique for trace gas measurement.
  • Employed a patent-pending sample extraction method for efficient sample handling.
  • Conducted laboratory calibration, intercomparison with standard methods (headspace equilibration and gas chromatography), and field deployment.

Main Results:

  • The Sub-Ocean probe exhibits a fast response time of approximately 30 seconds.
  • The instrument operates effectively up to 40 MPa and covers a wide dynamic range (sub-nmol L⁻¹ to mmol L⁻¹).
  • Field results showed good agreement with standard methods, with a 620-m vertical profile obtained in 10 minutes, revealing methane levels between 1-2 nmol L⁻¹ below the pycnocline and a surface maximum.

Conclusions:

  • The Sub-Ocean probe is a highly effective tool for fast, continuous, and accurate in situ measurement of dissolved methane in seawater.
  • The instrument's capabilities facilitate detailed 3D mapping and vertical profiling, enhancing our understanding of methane dynamics in marine ecosystems.
  • The probe's performance supports its utility for oceanographic research and environmental monitoring of methane.