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| Titel |
A new Himalayan ice core CH4 record: possible hints at the preindustrial latitudinal gradient |
| VerfasserIn |
S. Hou, J. Chappellaz, D. Raynaud, V. Masson-Delmotte, J. Jouzel, P. Bousquet, D. Hauglustaine |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 6 ; Nr. 9, no. 6 (2013-11-08), S.2549-2554 |
| Datensatznummer |
250085259
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| Publikation (Nr.) |
 copernicus.org/cp-9-2549-2013.pdf |
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| Zusammenfassung |
| Two ice cores recovered from the Himalayan East Rongbuk (ER) Glacier on the
northeast saddle of Mt. Qomolangma (Everest) (28°01' N,
86°58' E, 6518 m above sea level) give access to a tentative
record of past Himalayan atmospheric mixing ratio of CH4 spanning the
past 1200 yr. The major part of the record is affected by artifacts probably
due to in situ production. After selecting what may represent the true
atmospheric mixing ratio, an average of 749 ± 25 ppbv of CH4 is
estimated for the late preindustrial Holocene, which is ~ 36 ± 17
(~ 73 ± 18) ppbv higher than the atmospheric levels recorded in
the Greenland (Antarctic) ice cores. A comparison of these new data with
model simulations of the CH4 latitudinal gradient suggests either that
the models do not get a correct balance between high and low latitude
CH4 sources, or that the filtered CH4 profile from the ER cores
remains biased by small artifacts. |
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