まとめ
地上ヘテロジン放射測定法により,オゾン濃度およびプロフィールを測定することが成功しました. このテクニックは,大気圏と大気圏の両方のオゾン層に関する重要なデータを提供します.
科学分野:
- 大気科学 大気科学
- リモートセンシングによる遠隔感知
- スペクトル顕微鏡検査です.
背景:
- オゾンは,大気質と気候に影響を与える重要な大気成分です.
- 精密なオゾン測定は,大気の研究にとって不可欠です.
- 既存の遠隔感知技術は,特定のオゾン層へのアクセスを制限しています.
研究 の 目的:
- オゾン負荷総量と高度濃度プロフィールを測定する.
- オゾンモニタリングのための地上ヘテロダイン放射測定の有効性を評価する.
- トロポスフィアのオゾンとストラトスフィアのオゾンに関するデータを収集します.
主な方法:
- カリフォルニア州パサデナにある地上ヘテロジン放射計を利用した.
- 9.5マイクロメートルのオゾン赤外線吸収帯にフォーカスしています.
- 高スペクトル解像度 (0.001cm−1) のローカルオシレータとして二酸化炭素レーザーを使用しました.
主要な成果:
- オゾン濃度の測定と高度プロファイルの測定が成功しました.
- オゾン負荷の合計を決定しました.
- トロポスフィアの領域とストラトスフィアの領域の両方でオゾンを測定する能力を実証しました.
結論:
- 地上ヘテロダイン放射測定は,オゾンプロファイリングの有効な技術です.
- この方法は,大気の研究,特にアクセスが難しいオゾン層の研究に貴重なデータを提供します.
- この技術は,オゾン層の継続的なモニタリングに希望を示しています.
関連する概念動画
01:09Infrared (IR) Spectroscopy: Overview
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...
01:13Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
The ATR process begins by directing a beam...
01:25IR Spectrometers
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...
01:24IR Spectroscopy: Molecular Vibration Overview
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
01:19IR Spectrum
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
01:11Applications of IR Spectroscopy: Overview
The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...