Empirical validation and proof of added value of MUSICA's tropospheric δD remote sensing products

Schneider, Mat­thias; González, Y.; Dyroff, Christoph; Christner, Emanuel; Wiegele, A.; Barthlott, Sabine; García, Omaira; Sepúlveda, Eliezer; Hase, Frank; Andrey, Javier; Blumenstock, Thomas; Guirado-Fuentes, Carmen; Ramos, Ramón; Rodrı́guez, Sergio

doi:10.5194/amt-8-483-2015

Cited by 38 publications

(68 citation statements)

References 35 publications

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“…2.5. The technical details for this comparison, like the need for applying the averaging kernels to the reference profiles, are the same as for the exemplary study of Schneider et al (2015). The error bars on the reference data are largely due to the unknown humidity and δD values above the aircraft's ceiling altitude.…”

Section: Ndacc/ftirmentioning

confidence: 95%

“…In an exemplary study with the previous MUSICA MetOp/IASI retrieval version, Schneider et al (2015) reported a bias between the IASI δD product and the δD reference of about 60 ‰ (see Fig. 11 therein).…”

Section: Metop/iasimentioning

confidence: 99%

“…It is the tropospheric {H 2 O,δD} pair distribution that gives insight into tropospheric moisture pathways and therefore, it is the distribution of these pairs that has to be validated. Wiegele et al (2014) and Schneider et al (2015) presented approaches for such kinds of validation exercises. Here, we present a further refined {H 2 O,δD} pair validation and compare in situ, MUSICA v2015 NDACC/FTIR, MUSICA v2015 MetOp/IASI-A and MUSICA v2015 MetOp/IASI-B data sets.…”

Section: Validation Of {H 2 Oδd} Pair Distributionsmentioning

confidence: 99%

“…9 and 10 of Schneider et al, 2015). That study was done with a limited data set (only one exemplary remote sensing observation per day).…”

Section: Ndacc/ftirmentioning

confidence: 99%

“…The summer 2013 MUSICA campaign generated reliable H 2 O and HDO (and δD) in situ reference profiles on 6 days between the sea surface and 6-7 km altitude Schneider et al, 2015). From the δD profiles we calculate δ 18 and then H 18 2 O profiles by assuming δD = 8 × δ 18 (H 18 2 O is needed for validating the v2015 NDACC/FTIR product).…”

Section: Calibrated Remote Sensing Productsmentioning

confidence: 99%

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Accomplishments of the MUSICA project to provide accurate, long-term, global and high-resolution observations of tropospheric {H2O,δD} pairs – a review

et al. 2016

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Abstract. In the lower/middle troposphere, {H 2 O,δD} pairs are good proxies for moisture pathways; however, their observation, in particular when using remote sensing techniques, is challenging. The project MUSICA (MUltiplatform remote Sensing of Isotopologues for investigating the Cycle of Atmospheric water) addresses this challenge by integrating the remote sensing with in situ measurement techniques. The aim is to retrieve calibrated tropospheric {H 2 O,δD} pairs from the middle infrared spectra measured from ground by FTIR (Fourier transform infrared) spectrometers of the NDACC (Network for the Detection of Atmospheric Composition Change) and the thermal nadir spectra measured by IASI (Infrared Atmospheric Sounding Interferometer) aboard the MetOp satellites. In this paper, we present the final MUSICA products, and discuss the characteristics and potential of the NDACC/FTIR and MetOp/IASI {H 2 O,δD} data pairs.First, we briefly resume the particularities of an {H 2 O,δD} pair retrieval. Second, we show that the remote sensing data of the final product version are absolutely calibrated with respect to H 2 O and δD in situ profile references measured in the subtropics, between 0 and 7 km. Third, we reveal that the {H 2 O,δD} pair distributions obtained from the different remote sensors are consistent and allow distinct lower/middle tropospheric moisture pathways to be identified in agreement with multi-year in situ references. Fourth, we document the possibilities of the NDACC/FTIR instruments for climatological studies (due to long-term monitoring) and of the MetOp/IASI sensors for observing diurnal signals on a quasi-global scale and with high horizontal resolution. Fifth, we discuss the risk of misinterpreting {H 2 O,δD} pair distributions due to incomplete processing of the remote sensing products.

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Section: Ndacc/ftirmentioning

confidence: 95%

Section: Metop/iasimentioning

confidence: 99%

Section: Validation Of {H 2 Oδd} Pair Distributionsmentioning

confidence: 99%

“…9 and 10 of Schneider et al, 2015). That study was done with a limited data set (only one exemplary remote sensing observation per day).…”

Section: Ndacc/ftirmentioning

confidence: 99%

Section: Calibrated Remote Sensing Productsmentioning

confidence: 99%

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Accomplishments of the MUSICA project to provide accurate, long-term, global and high-resolution observations of tropospheric {H2O,δD} pairs – a review

et al. 2016

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Moist processes during MJO events as diagnosed from water isotopic measurements from the IASI satellite

Tuinenburg

Risi

Lacour

et al. 2015

J. Geophys. Res. Atmos.

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This study aims to investigate some characteristics of the moist processes of the Madden-Julian oscillation (MJO), by making use of joint HDO (or δD) and H2O vapor measurements. The MJO is the main intraseasonal mode of the tropical climate but is hard to properly simulate in global atmospheric models. The joint use of δD-H2O diagnostics yields additional information compared to sole humidity measurements. We use midtropospheric Infrared Atmospheric Sounding Interferometer (IASI) satellite δD and H2O measurements to determine the mean MJO humidity and δD evolution. Moreover, by making use of high temporal resolution data, we determine the variability in this evolution during about eight MJO events from 2010 to 2012 (including those monitored during the DYNAMO (the Dynamics of the MJO), CINDY (Cooperative Indian Ocean Experiment in Y2011) campaign). These data have a higher spatiotemporal coverage than previous δD measurements, enabling the sampling of individual MJO events. IASI measurements over the Indian Ocean confirm earlier findings that the moistening before the precipitation peak of an MJO event is due to water vapor slightly enriched in HDO. There is then a HDO depletion around the precipitation peak that also corresponds to the moister environment. Most interevent variability determined in the current study occurs 5 to 10 days after the MJO event. In 75% of the events, humidity decreases while the atmosphere remains depleted. In a quarter of the events, humidity increases simultaneously with an increase in δD. After this, the advection of relatively dry and enriched air brings back the state to the mean. Over the maritime continent, δD-H2O cycles are more variable on time scales shorter than the MJO and the interevent variability is larger than over the Indian Ocean. The sequence of moistening and drying processes as revealed by the q-δD cycles can be used as a benchmark to evaluate the representation of moist processes in models. This is done here by comparing observations to simulations of the isotope enabled LMDZ (Laboratoire de Météorologie Dynamique Zoom) global climate model nudged with reanalysis wind fields. These simulations also give information to investigate possible physical origins of the observed q-δD cycles. Disciplines Medicine and Health Sciences | Social and Behavioral Sciences Publication DetailsTuinenburg, O. A., Risi, C., Lacour, J. L., Schneider, M., Wiegele, A., Worden, J., Kurita, N., Duvel, J. P., Deutscher, N., Bony, S., Coheur, P. Abstract This study aims to investigate some characteristics of the moist processes of the Madden-Julian oscillation (MJO), by making use of joint HDO (or D) and H 2 O vapor measurements. The MJO is the main intraseasonal mode of the tropical climate but is hard to properly simulate in global atmospheric models. The joint use of D-H 2 O diagnostics yields additional information compared to sole humidity measurements. We use midtropospheric Infrared Atmospheric Sounding Interferometer (IASI) satellite D and H 2 O measurements to determine th...

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Evaluating TROPOMI δD Column Retrievals With In Situ Airborne Field Campaign Measurements Using Expanded Collocation Criterion

Thurnherr,

Sodemann,

Trent

et al. 2024

Earth and Space Science

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Satellite observations of column‐averaged water isotopes are relatively new retrieval products that are in need of further in situ evaluation. Such evaluation studies are generally difficult to perform due to the wide mismatch in temporal and spatial scales between the satellite observations based on instantaneous pixel averages during an overpass and airborne in situ measurements ranging up to several hours over a km‐scale. In addition, topography, weather conditions and in particular cloudiness impose severe constraints on an exact collocation between satellite and airborne in situ measurement platforms. Here we present a new method that allows a comparison between in situ measurements and satellite observations of δD on a broader statistical basis. We use regional isotope‐enabled model simulations as intermediate information to identify the area for best comparisons. Applying our methodology to TROPOMI total column δD retrievals for the L‐WAIVE campaign in Annecy, France, during June 2019 increases the number of satellite pixels for comparison despite widespread cloudiness on average by a factor of 20. In addition, the comparison of simulated and observed δD revealed a dependency of the satellite evaluation on the structure of the middle and upper troposphere. We conclude that our method provides a more robust statistic basis for in situ evaluation of δD satellite retrievals. The method will thus be useful in planning and executing forthcoming validation and evaluation campaigns, and can potentially be used for the evaluation of other satellite products.

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Empirical validation and proof of added value of MUSICA's tropospheric δD remote sensing products

Cited by 38 publications

References 35 publications

Accomplishments of the MUSICA project to provide accurate, long-term, global and high-resolution observations of tropospheric {H<sub>2</sub>O,<i>δ</i>D} pairs – a review

Accomplishments of the MUSICA project to provide accurate, long-term, global and high-resolution observations of tropospheric {H<sub>2</sub>O,<i>δ</i>D} pairs – a review

Moist processes during MJO events as diagnosed from water isotopic measurements from the IASI satellite

Evaluating TROPOMI δD Column Retrievals With In Situ Airborne Field Campaign Measurements Using Expanded Collocation Criterion

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Empirical validation and proof of added value of MUSICA's tropospheric δD remote sensing products

Cited by 38 publications

References 35 publications

Accomplishments of the MUSICA project to provide accurate, long-term, global and high-resolution observations of tropospheric {H&lt;sub&gt;2&lt;/sub&gt;O,&lt;i&gt;δ&lt;/i&gt;D} pairs – a review

Accomplishments of the MUSICA project to provide accurate, long-term, global and high-resolution observations of tropospheric {H&lt;sub&gt;2&lt;/sub&gt;O,&lt;i&gt;δ&lt;/i&gt;D} pairs – a review

Moist processes during MJO events as diagnosed from water isotopic measurements from the IASI satellite

Evaluating TROPOMI δD Column Retrievals With In Situ Airborne Field Campaign Measurements Using Expanded Collocation Criterion

Contact Info

Product

Resources

About

Accomplishments of the MUSICA project to provide accurate, long-term, global and high-resolution observations of tropospheric {H<sub>2</sub>O,<i>δ</i>D} pairs – a review

Accomplishments of the MUSICA project to provide accurate, long-term, global and high-resolution observations of tropospheric {H<sub>2</sub>O,<i>δ</i>D} pairs – a review