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Comparison of an isotopic atmospheric general circulation model with new quasi-global satellite measurements of water vapor isotopologues

Yoshimura, Kei and Frankenberg, Christian and Lee, Jeonghoon and Kanamitsu, Masao and Worden, John and Röckmann, Thomas (2011) Comparison of an isotopic atmospheric general circulation model with new quasi-global satellite measurements of water vapor isotopologues. Journal of Geophysical Research D, 116 (D19). Art. No. D19118. ISSN 0148-0227.

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We performed an intensive comparison of an isotope-incorporated atmospheric general circulation model with vapor isotopologue ratio observation data by two quasi-global satellite sensors in preparation for data assimilation of water isotope ratios. A global Isotope-incorporated Global Spectral Model simulation nudged toward the reanalysis wind field, atmospheric total column data from Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) on Envisat, and midtropospheric (800 to 500 hPa) data from Tropospheric Emission Spectrometer (TES) on Aura were used. For the mean climatological δD of both the total atmospheric column and the midtroposphere layer, the model reproduced their geographical variabilities quite well. There is, however, some degree of underestimation of the latitudinal gradient (higher δD in the tropics and lower δD in midlatitudes) compared to the SCIAMACHY data, whereas there is generally less disagreement except lower δD over the Maritime Continent compared to the TES data. It was also found that the two satellite products have different relationships between water vapor amount and isotopic composition. Particularly, atmospheric column mean δD, which is dominated by lower-tropospheric vapor, closely follows the fractionation pattern of a typical Rayleigh-type “rain out” process, whereas in the midtroposphere the relationship between isotopic composition and vapor amount is affected by a “mixing” process. This feature is not reproduced by the model, where the relationships between δD and the vapor are similar to each other for the atmospheric column and midtroposphere. Comparing on a shorter time scale, it becomes clear that the data situation for future data assimilation for total column δD is most favorable for tropical and subtropical desert areas (i.e., Sahel, southern Africa, mideastern Asia, Gobi, Australia, and the southwest United States), whereas the available midtropospheric δD observations cover wider regions, particularly over tropical to subtropical oceans.

Item Type:Article
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URLURL TypeDescription DOIArticle
Frankenberg, Christian0000-0002-0546-5857
Worden, John0000-0003-0257-9549
Röckmann, Thomas0000-0002-6688-8968
Additional Information:© 2011 by the American Geophysical Union. Received 29 March 2011; revised 19 July 2011; accepted 20 July 2011; published 14 October 2011. A part of this research was funded by the Japan Society for the Promotion of Science (JSPS) grant 23686071. The numerical simulations were performed with computing resources at the Center for Observations and Prediction at Scripps (COMPAS) and at TeraGrid. Part of this work was also funded by the California Energy Commission Public Interest Energy Research (PIER) program, which supports the California Climate Change Center (award MGC‐04‐04) and NOAA (NA17RJ1231). The views expressed herein are those of the authors and do not necessarily reflect the views of NOAA. We would like to thank J. Roads for his encouragement in the beginning of this study. The assistance of Ms. D. Boomer in refining the writing is appreciated. The authors thank all the comments from two reviewers including Matthias Schneider.
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)23686071
California Energy Commission Public Interest Energy Research (PIER) ProgramMGC‐04‐04
National Oceanic and Atmospheric Administration (NOAA)NA17RJ1231
Issue or Number:D19
Record Number:CaltechAUTHORS:20150512-082550137
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Official Citation:Yoshimura, K., C. Frankenberg, J. Lee, M. Kanamitsu, J. Worden, and T. Röckmann (2011), Comparison of an isotopic atmospheric general circulation model with new quasi-global satellite measurements of water vapor isotopologues, J. Geophys. Res., 116, D19118, doi:10.1029/2011JD016035
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57431
Deposited By: Tony Diaz
Deposited On:12 May 2015 18:02
Last Modified:09 Mar 2020 13:19

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