Validation of version-4.61 methane and nitrous oxide observed by MIPAS

Payan, Sébastien; Camy‐Peyret, C.; Oelhaf, H.; Wetzel, G.; Maucher, G.; Keim, C.; Pirre, Michel; Huret, Nathalie; Engel, Andreas; Volk, M.; Kuellmann, H.; Kuttippurath, J.; Cortesi, Ugo; Bianchini, Giovanni; Mencaraglia, F.; Raspollini, Piera; Redaelli, G.; Vigouroux, Corinne; Mazière, Martine De; Mikuteit, S.; Blumenstock, Thomas; Velazco, Voltaire A.; Notholt, Justus; Mahieu, Emmanuel; Duchatelet, Pierre; Smale, Dan; Wood, S.; Jones, Nicholas; Piccolo, C.; Payne, Vivienne H.; Bracher, Astrid; Glatthor, N.; Stiller, G. P.; Grunow, K.; Jeseck, Pascal; Té, Yao; Butz, A.

doi:10.5194/acp-9-413-2009

Cited by 52 publications

(58 citation statements)

References 56 publications

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“…The positive bias of ∼10-15% in the lower stratosphere is attributed to the known positive bias in MIPAS retrievals (Payan et al, 2009;Glatthor et al, 2005). High relative differences observed in the upper stratosphere are due to low N 2 O concentrations present in this region.…”

Section: N 2 Omentioning

confidence: 86%

MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O3, HNO3, N2O, H2O and relative humidity over ice: retrievals and comparison to MLS

Chauhan¹,

Höpfner²,

Stiller³

et al. 2009

Atmos. Meas. Tech.

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∼146 to 68 hPa. These differences are mainly caused by the MLS temperature biases. Ozone mixing ratios agree within 0.5 ppmv (10 to 20%) between 68 and 14 hPa. At pressures smaller than 10 hPa, MIPAS O 3 vmr are higher than MLS by an average of 0.5 ppmv (10%). General agreement between MIPAS and MLS HNO 3 is within the range of −1.0 (−10%) to 1.0 ppbv (20%). MIPAS HNO 3 is 1.0 ppbv (10%) higher compared to MLS between 46 hPa and 10 hPa over the Northern Hemisphere. Over the tropics at 31.6 hPa MLS shows a low bias of more than 1 ppbv (>50%). In general, MIPAS and MLS N 2 O vmr agree within 20 to 40 ppbv (20 to 40%). Differences in the range between 100 to 21 hPa are attributed to a known 20% positive bias in MIPAS N 2 O data.

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Section: N 2 Omentioning

confidence: 86%

MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O3, HNO3, N2O, H2O and relative humidity over ice: retrievals and comparison to MLS

Chauhan¹,

Höpfner²,

Stiller³

et al. 2009

Atmos. Meas. Tech.

Self Cite

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“…Two major types of measurement are (1) the measurement of the total column using the nearinfrared spectrum and (2) the measurement of the mid-toupper troposphere methane (MUT-CH 4 ) using the thermal infrared spectrum with bands of 7.66, 3.3 and 2.3 m [13][14][15][16][17][18][19][20][21][22][23]. One of the spaceborne thermal infrared sounders in operation, the Atmospheric Infrared Sounder (AIRS), was launched in polar orbit (13:30, ascending node) on the EOS/Aqua satellite in May 2002; CH 4 is one of its research products [13,14].…”

mentioning

confidence: 99%

Spatiotemporal variations in mid-upper tropospheric methane over China from satellite observations

et al. 2011

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Spaceborne measurements by the Atmospheric Infrared Sounder (AIRS) on the EOS/Aqua satellite provide a global view of methane (CH 4 ) distribution in the mid-upper troposphere (MUT-CH 4 ). The focus of this study is to analyze the spatiotemporal variations in MUT-CH 4 over China from 2003 to 2008. Validation of AIRS CH 4 products versus Fourier transform infrared profiles demonstrates that its RMS error is mostly less than 1.5%. A typical atmospheric methane profile is found that shows how concentrations decrease as height increases because of surface emissions. We found that an important feature in the seasonal variation in CH 4 is the two peaks that exist in summer and winter in most parts of China, which is also observed in in-situ measurements at Mt. Waliguan, Qinghai Province, China (36.2879°N 100.8964°E, 3810 m). Also, in the summer, only one peak existed in western and southern China since there are no more significant anthropogenic sources in winter than at any other time of the year.

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“…This suggests that MIPAS v7 does not provide more regular profiles of CH 4 than v6. These vertical oscillations in the tropics were discussed for MIPAS v4.61 (Payan et al, 2009) and are still present in v6 and v7. Although less pronounced, the same issues appear for N 2 O (not shown).…”

Section: Comparison Of the Assimilation Experimentsmentioning

confidence: 99%

“…Full-resolution ML2PP v4.61 of methane and nitrous oxide have been validated by Payan et al (2009), during the first phase of MIPAS. In the middle stratosphere, no significant bias is observed between ML2PP profiles and correlative measurements.…”

Section: Mipasmentioning

confidence: 99%

Harmonisation and diagnostics of MIPAS ESA CH4 and N2O profiles using data assimilation

et al. 2016

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Abstract. This paper discusses assimilation experiments of methane (CH 4 ) and nitrous oxide (N 2 O) profiles retrieved from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS). Here we focus on data versions 6 and 7 provided by the ESA processor. These data sets have been assimilated by the Belgian Assimilation System for Chemical ObsErvations (BASCOE). The CH 4 and N 2 O retrieved profiles can oscillate, especially in the tropical lower stratosphere. Using the averaging kernels of the observations and a background error covariance matrix, which has previously been calibrated, allows the system to partly remedy this issue and provide assimilated fields that are more regular vertically. In general, there is a good agreement between the BAS-COE analyses and independent observations from ACE-FTS (CH 4 and N 2 O) and MLS (N 2 O), demonstrating the general good quality of CH 4 and N 2 O retrievals provided by MIPAS ESA. Nevertheless, this study also identifies two issues in these data sets. First, time series of the observations show unexpected discontinuities due to an abrupt change in the gain of MIPAS band B, generally occurring after the instrument decontamination. Since the calibration is performed weekly, the abrupt change in the gain affects the measurements until the subsequent calibration is performed. Second, the correlations between BASCOE analyses and independent observations are poor in the lower stratosphere, especially in the tropics, probably due to the presence of outliers in the assimilated data. In this region, we recommend using MIPAS CH 4 and N 2 O retrievals with caution.

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Validation of version-4.61 methane and nitrous oxide observed by MIPAS

Cited by 52 publications

References 56 publications

MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O<sub>3</sub>, HNO<sub>3</sub>, N<sub>2</sub>O, H<sub>2</sub>O and relative humidity over ice: retrievals and comparison to MLS

MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O<sub>3</sub>, HNO<sub>3</sub>, N<sub>2</sub>O, H<sub>2</sub>O and relative humidity over ice: retrievals and comparison to MLS

Spatiotemporal variations in mid-upper tropospheric methane over China from satellite observations

Harmonisation and diagnostics of MIPAS ESA CH<sub>4</sub> and N<sub>2</sub>O profiles using data assimilation

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Validation of version-4.61 methane and nitrous oxide observed by MIPAS

Cited by 52 publications

References 56 publications

MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O&lt;sub&gt;3&lt;/sub&gt;, HNO&lt;sub&gt;3&lt;/sub&gt;, N&lt;sub&gt;2&lt;/sub&gt;O, H&lt;sub&gt;2&lt;/sub&gt;O and relative humidity over ice: retrievals and comparison to MLS

MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O&lt;sub&gt;3&lt;/sub&gt;, HNO&lt;sub&gt;3&lt;/sub&gt;, N&lt;sub&gt;2&lt;/sub&gt;O, H&lt;sub&gt;2&lt;/sub&gt;O and relative humidity over ice: retrievals and comparison to MLS

Spatiotemporal variations in mid-upper tropospheric methane over China from satellite observations

Harmonisation and diagnostics of MIPAS ESA CH&lt;sub&gt;4&lt;/sub&gt; and N&lt;sub&gt;2&lt;/sub&gt;O profiles using data assimilation

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MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O<sub>3</sub>, HNO<sub>3</sub>, N<sub>2</sub>O, H<sub>2</sub>O and relative humidity over ice: retrievals and comparison to MLS

MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O<sub>3</sub>, HNO<sub>3</sub>, N<sub>2</sub>O, H<sub>2</sub>O and relative humidity over ice: retrievals and comparison to MLS

Harmonisation and diagnostics of MIPAS ESA CH<sub>4</sub> and N<sub>2</sub>O profiles using data assimilation