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  • 1
    Online Resource
    Online Resource
    Uranus among the Outer Planets
    Cambridge University Press (CUP) ; 1982
    In:  International Astronomical Union Colloquium Vol. 60 ( 1982), p. 295-302
    Details
    In: International Astronomical Union Colloquium, Cambridge University Press (CUP), Vol. 60 ( 1982), p. 295-302
    Type of Medium: Online Resource
    ISSN: 0252-9211
    URL: Article
    DOI: 10.1017/S025292110008249X
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1982
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  • 2
    Online Resource
    Online Resource
    Observational Constraints on Model Atmospheres for Uranus and Neptune
    Cambridge University Press (CUP) ; 1974
    In:  Symposium - International Astronomical Union Vol. 65 ( 1974), p. 487-496
    Details
    In: Symposium - International Astronomical Union, Cambridge University Press (CUP), Vol. 65 ( 1974), p. 487-496
    Abstract: We have re-examined the visible and near-IR regions of the spectra of Uranus and Neptune to provide additional data for constructing atmospheric models. We find that a true continuum exists only at wavelengths below 4700 Å, that the 6420 Å absorption previously attributed to hydrogen is probably caused by methane, that there is no evidence for ammonia, ethylene or ethane absorptions in our spectra, and that the abundance of methane is probably much higher than previous estimates suggest. This last finding implies that the value of H/C in the atmospheres of both planets is much less than 1/10 the solar (or Jovian) value. Clear, Rayleigh-scattering model atmospheres are not compatible with the observations, but more work is needed to establish viable alternatives.
    Type of Medium: Online Resource
    ISSN: 0074-1809
    URL: Article
    DOI: 10.1017/S0074180900025730
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1974
    SSG: 16,12
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  • 3
    Online Resource
    Online Resource
    Noble Gases in Terrestrial Planets: Evidence for Cometary Impacts?
    Cambridge University Press (CUP) ; 1989
    In:  International Astronomical Union Colloquium Vol. 116, No. 1 ( 1989), p. 429-437
    Details
    In: International Astronomical Union Colloquium, Cambridge University Press (CUP), Vol. 116, No. 1 ( 1989), p. 429-437
    Abstract: The possible role of comets in bringing volatiles to the inner planets is investigated by means of laboratory studies of the ability of ice to trap gases at low temperatures. The pattern of the heavy noble gases formed in the atmosphere of Venus can be explained by the impact of a planetesimal composed of ices formed in the range of 20 to 30 K. The noble gas patterns on Mars and Earth are less explicable by cometary bombardment alone.
    Type of Medium: Online Resource
    ISSN: 0252-9211
    URL: Article
    DOI: 10.1017/S0252921100109789
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1989
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  • 4
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    Online Resource
    Mars: was There an Ancient Eden?
    Cambridge University Press (CUP) ; 1997
    In:  International Astronomical Union Colloquium Vol. 161 ( 1997-01), p. 203-218
    Details
    In: International Astronomical Union Colloquium, Cambridge University Press (CUP), Vol. 161 ( 1997-01), p. 203-218
    Abstract: The clear evidence of water erosion on the surface of Mars suggests an early climate much more clement than the present one. Using a model for the origin of inner planet atmospheres by icy planetesimal impact, it is possible to reconstruct the original volatile inventory on Mars, starting from the thin atmosphere we observe today. Evidence for cometary impact can be found in the present abundances and isotope ratios of gases in the atmosphere and in SNC meteorites. If we invoke impact erosion to account for the present excess of 129 Xe, we predict an early inventory equivalent to at least 7.5 bars of CO 2 . This reservoir of volatiles is adequate to produce a substantial greenhouse effect, provided there is some small addition of SO 2 (volcanoes) or reduced gases (cometary impact). Thus it seems likely that conditions on early Mars were suitable for the origin of life – biogenic elements and liquid water were present at favorable conditions of pressure and temperature. Whether life began on Mars remains an open question, receiving hints of a positive answer from recent work on one of the Martian meteorites. The implications for habitable zones around other stars include the need to have rocky planets with sufficient mass to preserve atmospheres in the face of intensive early bombardment.
    Type of Medium: Online Resource
    ISSN: 0252-9211
    URL: Article
    DOI: 10.1017/S025292110001472X
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1997
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  • 5
    Online Resource
    Online Resource
    COMMISSION 16: PHYSICAL STUDY OF PLANETS AND SATELLITES
    Cambridge University Press (CUP) ; 2007
    In:  Proceedings of the International Astronomical Union Vol. 3, No. T26B ( 2007-12), p. 133-135
    Details
    In: Proceedings of the International Astronomical Union, Cambridge University Press (CUP), Vol. 3, No. T26B ( 2007-12), p. 133-135
    Abstract: Commission 16 held its business meeting during the General Assembly in Prague, on Wednesday August 23, 2006, with nine members present. The meeting was called to order at 14:00 hr by president Guy Consolmagno. A moment of silence was observed in memory of those Commission (or Division) members deceased since the last General Assembly. They are Joseph W. Chamberlain, Michel Festou, Thomas Gold, Cornell H. Mayer, Vasilij I. Moroz, William M. Sinton, Willem Wamsteker, James A. Westphal, and Fred L. Whipple.
    Type of Medium: Online Resource
    ISSN: 1743-9213 , 1743-9221
    URL: Article
    DOI: 10.1017/S1743921308023818
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2007
    detail.hit.zdb_id: 2170724-8
    SSG: 16,12
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  • 6
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    DIVISION III / WG: PLANETARY SYSTEM NOMENCLTURE
    Cambridge University Press (CUP) ; 2007
    In:  Proceedings of the International Astronomical Union Vol. 3, No. T26B ( 2007-12), p. 120-127
    Details
    In: Proceedings of the International Astronomical Union, Cambridge University Press (CUP), Vol. 3, No. T26B ( 2007-12), p. 120-127
    Abstract: The meeting was attended by six from the WG (K. Aksnes, J. Blunck, G. Consolmagno, B. Marsden, R. Schulz, V. Shevchenko) and two from the Task Groups (D. Morrison, J. Watanabe). Also the incoming WG members E. Bowell and R. Courtin, as well as some guests, attended.
    Type of Medium: Online Resource
    ISSN: 1743-9213 , 1743-9221
    URL: Article
    DOI: 10.1017/S1743921308023788
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2007
    detail.hit.zdb_id: 2170724-8
    SSG: 16,12
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  • 7
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    Online Resource
    Glaciological and climatological drivers of heterogeneous glacier mass loss in the Tanggula Shan (Central-Eastern Tibetan Plateau), since the 1960s
    Cambridge University Press (CUP) ; 2023
    In:  Journal of Glaciology
    Details
    In: Journal of Glaciology, Cambridge University Press (CUP)
    Abstract: Despite their extreme elevation, glaciers on the Tibetan Plateau are losing mass in response to atmospheric warming, the pattern of which purportedly reflects regional contrasts in climate. Here we examine the evolution of glaciers along ~500 km of the Tanggula Shan, Central-Eastern Tibetan Plateau. Using remotely sensed datasets, we quantified changes in glacier mass, area and surface velocity, and compared these results to time series of meteorological observations, in order to disentangle drivers of glacier mass loss since the 1960s. Glacier mass loss has increased (from −0.21 ± 0.12 m w.e. a −1 in 1960s–2000s, to −0.52 ± 0.18 m w.e. a −1 in 2000s–2015/18) in association with pervasive positive temperature anomalies (up to 1.85°C), which are pronounced at the end of the now lengthened ablation season. However, glacier mass budget perturbations do not mirror the magnitude of temperature anomalies in sub-regions, thus additional factors have heightened glacier recession. We show how proglacial lake expansion and glacier surging have compounded glacier recession over decadal/multi-decadal time periods, and exert similar influence on glacier mass budgets as temperature changes. Our results demonstrate the importance of ice loss mechanisms not often incorporated into broad-scale glacier projections, which need to be better considered to refine future glacier runoff estimates.
    Type of Medium: Online Resource
    ISSN: 0022-1430 , 1727-5652
    URL: Article
    DOI: 10.1017/jog.2023.5
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2023
    detail.hit.zdb_id: 2140541-4
    SSG: 14
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  • 8
    Online Resource
    Online Resource
    The slow growth of humility : The Fault, Dear Brutus, lies not In the stars but in ourselves
    Cambridge University Press (CUP) ; 2010
    In:  Proceedings of the International Astronomical Union Vol. 6, No. S269 ( 2010-01), p. 13-19
    Details
    In: Proceedings of the International Astronomical Union, Cambridge University Press (CUP), Vol. 6, No. S269 ( 2010-01), p. 13-19
    Abstract: Galileo's stunning discovery of the four largest satellites of Jupiter forced the over throw of the Earth-centered cosmology that had dominated astronomy for centuries. Such a fundamental transformation of the Western World's view of its importance in the cosmos could be expected to produce some humility in society. However, the deep desire for our uniqueness continues to struggle with the astronomical evidence.
    Type of Medium: Online Resource
    ISSN: 1743-9213 , 1743-9221
    URL: Article
    DOI: 10.1017/S1743921310007210
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2010
    detail.hit.zdb_id: 2170724-8
    SSG: 16,12
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  • 9
    Online Resource
    Online Resource
    Solar Composition of Icy Planetesimals: A New Source For Comet Nuclei?
    Cambridge University Press (CUP) ; 2005
    In:  Highlights of Astronomy Vol. 13 ( 2005), p. 502-503
    Details
    In: Highlights of Astronomy, Cambridge University Press (CUP), Vol. 13 ( 2005), p. 502-503
    Abstract: The enrichment of heavy elements on Jupiter appears to require the existence of a new class of icy planetesimal that exhibits solar relative abundances. Prior to the Galileo probe mission, observations of methane in Jupiter’s atmosphere had revealed that C/H was approximately three times the solar ratio. This enrichment was thought to be the result of the delivery of heavy elements by icy planetesimals, which were assumed to be essentially identical to comets. However, comets are notoriously deficient in nitrogen (e.g., Geiss 1987; Krankowsky 1991) and recent upper limits on argon in three comets (Weaver et al. 2002) indicate that this element is also sub-solar relative to O. Hence it was assumed that Jupiter would exhibit the same deficiency in argon and nitrogen relative to carbon (Pollack and Bodenheimer 1989; Owen & Bar-Nun 1995). Yet the mass spectrometer on the Galileo Probe clearly showed that Ar, Kr, Xe, N, C, and S are all enriched in Jupiter’s atmosphere by the same factor of 3 ± 1 (Niemann et al. 1998; Owen et al. 1999).
    Type of Medium: Online Resource
    ISSN: 1539-2996
    URL: Article
    DOI: 10.1017/S1539299600016439
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2005
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  • 10
    Online Resource
    Online Resource
    Composition and Cloud Structure of Jupiter’s Deep Atmosphere
    Cambridge University Press (CUP) ; 2002
    In:  Highlights of Astronomy Vol. 12 ( 2002), p. 597-601
    Details
    In: Highlights of Astronomy, Cambridge University Press (CUP), Vol. 12 ( 2002), p. 597-601
    Abstract: Abundances of ammonia, hydrogen sulfide, water, methane and other hydrocarbons, noble gases and their isotopes, etc. were measured for the first time to the 22 bar level. The ratios of the heavy elements to hydrogen were found to be enriched by a factor of 2-3 relative to solar, implying a large influx of cold planetesimals into Jupiter.
    Type of Medium: Online Resource
    ISSN: 1539-2996
    URL: Article
    DOI: 10.1017/S1539299600014349
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2002
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