Observation of tropospheric δD by IASI over western Siberia: comparison with a general circulation model
This study presents the joint H<sub>2</sub><sup>16</sup>O and HDO retrieval from Infrared Atmospheric Sounding Interferometer (IASI) spectra over western Siberia. IASI is an instrument on board the MetOp-A European satellite. The global coverage of the instrument and the good...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-06-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/7/1581/2014/amt-7-1581-2014.pdf |
| Summary: | This study presents the joint H<sub>2</sub><sup>16</sup>O and HDO retrieval from
Infrared Atmospheric Sounding Interferometer (IASI) spectra over western
Siberia. IASI is an instrument on board the MetOp-A European satellite. The
global coverage of the instrument and the good signal-to-noise ratio allow
us to provide information on δD over this remote region. We show
that IASI measurements may be used to estimate integrated δD between
the surface and 3 km altitude or from 1 to 5 km depending on the thermal
contrast, with observational errors lower than 4% and 7%,
respectively. The retrieved data are compared to simulations from an
isotopic general circulation model, LMDZ-iso for 2011. The satellite measurements and the model
agree well and they reproduce well the seasonal and day-to-day variations
for δD, presenting a good correlation (<i>r</i> up to 0.8 with the smoothed
data in summer). The IASI-based retrievals also show the seasonal variation
of the specific humidity in both altitude ranges. |
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| ISSN: | 1867-1381 1867-8548 |