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Measurement of the isotopic ratio distribution of HD 16 O and H 2 16 O in the 20–38 km altitude range from far‐infrared spectra
Author(s) -
Dinelli Bianca Maria,
Lepri Gianmarco,
Carlotti Massimo,
Carli Bruno,
Mencaraglia Francesco,
Ridolfi Marco,
Nolt Ira G.,
Ade Peter A. R.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl02022
Subject(s) - altitude (triangle) , stratosphere , mixing ratio , spectral line , analytical chemistry (journal) , isotope , spectral resolution , range (aeronautics) , physics , atmospheric sciences , chemistry , materials science , nuclear physics , geometry , mathematics , chromatography , astronomy , composite material
The altitude distribution of the isotopic ratio between HD 16 O and H 2 16 O in the stratosphere is derived by retrieving the mixing ratio profiles (from 20 km to 38 km of altitude) of the two isotopic species from far‐infrared emission spectra. The measurements were made with a balloon‐borne Fourier Transform Spectrometer capable of 0.0025 cm −1 spectral resolution during the IBEX 92 campaign. The retrievals were carried out using the global‐fit procedure on a statistically significant number of spectra for each isotope, in the 40–75 cm −1 spectral region. This measurement determines the D/H ratio in stratospheric water over an altitude range larger than that of previous measurements. The value of the HD 16 O/H 2 16 O ratio, normalized to the standard value, ranges from 0.4 to 0.5 (with a 10% random error) in the altitude range studied and is in good agreement with the values previously measured.