H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;&amp;lt;sup&amp;gt;16&amp;lt;/sup&amp;gt;O and HDO measurements with IASI/MetOp

Herbin, Hervé; Hurtmans, Daniel; Clerbaux, Cathy; Clarisse, Lieven; Coheur, Pierre‐François

doi:10.5194/acp-9-9433-2009

Cited by 79 publications

(54 citation statements)

References 47 publications

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“…Interferometer) is an atmospheric interferometer working in the infrared, launched in 2006 on the METOP-A satellite (Phulpin et al 2007;Pougatchev et al 2008;Herbin et al 2009;Clerbaux et al 2009). The data are available at the website of the Centre for Atmospheric Chemistry Products and Services 1 .…”

Section: Iasi (Infrared Atmospheric Soundingmentioning

confidence: 99%

Worldwide site comparison for submillimetre astronomy

Tremblin¹,

Schneider²,

Minier³

et al. 2012

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Aims. The most important limitation for ground-based submillimetre (submm) astronomy is the broad-band absorption of the total water vapour in the atmosphere above an observation site, often expressed as the precipitable water vapour (PWV). A long-term statistic on the PWV is thus mandatory to characterize the quality of an existing or potential site for observational submm-astronomy. In this study we present a three-year statistic (2008)(2009)(2010) of the PWV for ground-based telescope sites all around the world and for stratospheric altitudes relevant for SOFIA (Stratospheric Observatory for Far-Infrared Astronomy). The submm-transmission is calculated for typical PWVs using an atmospheric model. Methods. We used data from IASI (Infrared Atmospheric Sounding Interferometer) on the Metop-A satellite to retrieve water vapour profiles for each site (11 in total, comprising Antarctica, Chile, Mauna Kea, Greenland, Tibet). The use of a single instrument to make the comparison provides unbiased data with a common calibration method. The profiles are integrated above the mountain/stratospheric altitude to get an estimation of the PWV. We then applied the atmospheric model MOLIERE (Microwave Observation and LIne Estimation and REtrieval) to compute the corresponding atmospheric absorption for wavelengths between 150 μm and 3 mm. Results. We present the absolute PWV values for each site sorted by year and time percentage. The PWV corresponding to the first decile (10%) and the quartiles (25%, 50%, 75%) are calculated and transmission curves between 150 μm and 3 mm for these values are shown. The Antarctic and South-American sites present very good conditions for submillimetre astronomy. The 350 μm and 450 μm atmospheric windows are open all year long, whereas the 200 μm atmospheric window opens reasonably for 25% of the time in Antarctica and the extremely high-altitude sites in Chile. Potential interesting new facilities are Macon in Argentina and Summit in Greenland, which show similar conditions to for example, Mauna Kea (Hawaii). For SOFIA, we present transmission curves for different altitudes (11 to 14 km), PWV values, and higher frequencies (up to 5 THz) in more detail. Though the atmosphere at these altitude is generally very transparent, the absorption at very high frequencies becomes more important, partly caused by minor species. The method presented in this paper could identify sites on Earth, with great potential for submillimetre astronomy, and guide future site testing campaigns in situ.

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Section: Iasi (Infrared Atmospheric Soundingmentioning

confidence: 99%

Worldwide site comparison for submillimetre astronomy

Tremblin¹,

Schneider²,

Minier³

et al. 2012

A&A

View full text Add to dashboard Cite

show abstract

“…Work performed from high spectral measurements in the thermal infrared (TIR), such as AIRS (Crevoisier et al, 2003;Engelen and Stephens, 2004;Divakarla et al, 2006;Chahine et al, 2008;Maddy et al, 2008;Xiong et al, 2008), TES (Shepard et al, 2008;Kulawik et al, 2010;Worden et al, 2012) and IASI (Crevoisier et al, 2009;Herbin et al, 2009;Razavi et al;, has demonstrated the sensitivity of these observations to the midtroposphere. Moreover, the OCO's pre-launch studies (Connor et al, 2008;Butz et al, 2009) as well as those from the shortwave infrared (SWIR) instrument SCIAMACHY Noël et al, 2005) have illustrated the ability of such measurements to get information on gaseous concentrations near the surface.…”

Section: Introductionmentioning

confidence: 99%

Multispectral information from TANSO-FTS instrument – Part 1: Application to greenhouse gases (CO2 and CH4) in clear sky conditions

2013

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Abstract. The Greenhouse gases Observing SATellite (GOSAT) mission, and in particular the Thermal And Near infrared Sensor for carbon Observations-Fourier Transform Spectrometer (TANSO-FTS) instrument, has the advantage of being able to measure simultaneously the same field of view in different spectral ranges with a high spectral resolution. These features allow studying the benefits of using multispectral measurements to improve the CO 2 and CH 4 retrievals.In order to quantify the impact of the spectral synergy on the retrieval accuracy, we performed an information content (IC) analysis from simulated spectra corresponding to the three infrared bands of TANSO-FTS. The advantages and limitations of using thermal and shortwave infrared simultaneously are discussed according to surface type and state vector composition. The IC is then used to determine the most informative spectral channels for the simultaneous retrieval of CO 2 and CH 4 . The results show that a channel selection spanning the three infrared bands can improve the computation time and retrieval accuracy. Therefore, a selection of less than 700 channels from the thermal infrared (TIR) and shortwave infrared (SWIR) bands allows retrieving CO 2 and CH 4 simultaneously with a similar accuracy to using all channels together to retrieve each gas separately.

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“…In the upper troposphere, the water vapor isotopic composition can be measured by satellites (Kuang et al, 2003;Nassar et al, 2007;Steinwagner et al, 2010) or in situ (Webster and Heymsfield, 2003;Sayres et al, 2010) and reflects the role of convection in the transport of water in the upper troposphere and through the tropopause (Moyer et al, 1996). In the mid-troposphere, the water vapor isotopic composition can also be measured by satellite (Worden et al, 2007;Herbin et al, 2009;Schneider and Hase, 2011) and in situ and may give an indication about water cycle processes such as mixing of air masses (Galewsky and Hurley, 2010) or rain reevaporation (Worden et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Water vapor isotopologue retrievals from high-resolution GOSAT shortwave infrared spectra

et al. 2013

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Remote sensing of the isotopic composition of water vapor can provide valuable information on the hydrological cycle. Here, we demonstrate the feasibility of retrievals of the relative abundance of HDO (the HDO/H2O ratio) from the Japanese GOSAT satellite. For this purpose, we use high spectral resolution nadir radiances around 6400 cm−1 (1.56 μm) to retrieve vertical column amounts of H2O and HDO. Retrievals of H2O correlate well with ECMWF (European Centre for Medium-Range Weather Forecasts) integrated profiles (r2 = 0.96). Typical precision errors in the retrieved column-averaged deuterium depletion (δD) are 20–40&permil;. We compare δD against a TCCON (Total Carbon Column Observing Network) ground-based station in Lamont, Oklahoma. Using retrievals in very dry areas over Antarctica, we detect a small systematic offset in retrieved H2O and HDO column amounts and take this into account for a bias correction of δD. Monthly averages of δD in the June 2009 to September 2011 time frame are well correlated with TCCON (r2 = 0.79) and exhibit a slope of 0.98 (1.23 if not bias corrected). We also compare seasonal averages on the global scale with results from the SCIAMACHY instrument in the 2003–2005 time frame. Despite the lack of temporal overlap, seasonal averages in general agree well, with spatial correlations (r2) ranging from 0.62 in September through November to 0.83 in June through August. However, we observe higher variability in GOSAT δD, indicated by fitted slopes between 1.2 and 1.46. The discrepancies are likely related to differences in vertical sensitivities but warrant further validation of both GOSAT and SCIAMACHY and an extension of the validation dataset

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H<sub>2</sub><sup>16</sup>O and HDO measurements with IASI/MetOp

Cited by 79 publications

References 47 publications

Worldwide site comparison for submillimetre astronomy

Worldwide site comparison for submillimetre astronomy

Multispectral information from TANSO-FTS instrument – Part 1: Application to greenhouse gases (CO<sub>2</sub> and CH<sub>4</sub>) in clear sky conditions

Water vapor isotopologue retrievals from high-resolution GOSAT shortwave infrared spectra

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H&lt;sub&gt;2&lt;/sub&gt;&lt;sup&gt;16&lt;/sup&gt;O and HDO measurements with IASI/MetOp

Cited by 79 publications

References 47 publications

Worldwide site comparison for submillimetre astronomy

Worldwide site comparison for submillimetre astronomy

Multispectral information from TANSO-FTS instrument – Part 1: Application to greenhouse gases (CO&lt;sub&gt;2&lt;/sub&gt; and CH&lt;sub&gt;4&lt;/sub&gt;) in clear sky conditions

Water vapor isotopologue retrievals from high-resolution GOSAT shortwave infrared spectra

Contact Info

Product

Resources

About

H<sub>2</sub><sup>16</sup>O and HDO measurements with IASI/MetOp

Multispectral information from TANSO-FTS instrument – Part 1: Application to greenhouse gases (CO<sub>2</sub> and CH<sub>4</sub>) in clear sky conditions