leroux-wiki

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    1. wmconnolley 30 months ago | reply

      That is from google's cache. Here is the text, again from the cache:

      Marcel Leroux (27 August 1938 – 12 August 2008) was a former Professor of Climatology at Jean Moulin University in Lyon, France, director of the Laboratoire de Climatologie, Risques et Environnement, and a global warming skeptic.
      Leroux argues in his book Global Warming: Myth or Reality? The Erring Ways of Climatology that the case for global warming is based on models which, with their insufficiencies in the understanding and explanation of weather phenomena, are not reliable to support this prediction. He also poses the question if warming may be considered a benefit in some regions.
      On the causes of climate change, he writes in a section entitled "Conclusion: The greenhouse effect is not the cause of climate change":
      The possible causes, then, of climate change are: well-established orbital parameters on the palaeoclimatic scale, with climatic consequences slowed by the inertial effect of glacial accumulations; solar activity, thought by some to be responsible for half of the 0.6°C rise in temperature, and by others to be responsible for all of it, which situation certainly calls for further analysis; volcanism and its associated aerosols (and especially sulphates), whose (short-term) effects are indubitable; and far at the rear, the greenhouse effect, and in particular that caused by water vapor, the extent of its influence being unknown.[1]
      Contents [hide]
      1 Scientific Contribution
      2 Awards
      3 References
      4 External links
      [edit]Scientific Contribution

      Leroux defended his PhD on climatology entitled The Climate of Tropical Africa in 1980. In 1983, a condensed version of his state doctoral thesis in climatology Le Climat de l'Afrique Tropicale was published by Champion-Slatkine financially supported principally by the World Meteorological Organization (WMO) in Geneva, and by the National Centre for Scientific Research (CNRS), the Ministry for Cooperation and Development (MCD) and the Agency for Technical and Cultural Cooperation (ACCT) in Paris.
      Leroux's work is intended to demonstrate through the analysis of synoptic maps, satellite imagery, meteorological and palaeoenvironmental data over Tropical Africa, that the seasonal and palaeoclimatic migration of the intertropical convergence zone represents a reliable proxy of the Earth's climate evolution.[2][3]
      In his theory, this migration and the extent of what he described as the Meteorological Equator (intertropical convergence zone) are the consequence of continuous meridional exchanges in the denser, lower layers of the atmosphere, which circulation he proposes is governed by "mobile polar highs" (MPH), 1.5 km high, 3,000 km diameter discoid, lenticular cold air-mass anticyclones originating from the poles, whose strength and frequency depends directly on the thermal polar deficit. In his theory, cooling generates an accelerated circulation while warming will slow the general circulation and exchanges.[4]
      He proposed that zones of continuous circulation from the pole to the equator are constrained by high topography (over 2,000m) and the present position of continents, and that these constraints are not adequately understood by meteorologists or incorporated in existing models. His interpretations of the data [2][5] lead to inconsistencies with general circulation models and observed climate indexes, and would challenge the dynamical, reductionist, and diagnostic schools of meteorology. This made him a controversial figure.
      In proposing his theories, Leroux aimed to refute what he sees as the artificial separation between meteorology and climatology, and attempted to redefine both disciplines in a similar way plate tectonics revolutionized Earth Sciences in the 1960s.[citation needed] He created a model for understanding the geometry of troposphere circulation[4] and argued that very little is owed to chaos: there is no 'unruly climate' but intensity shifts of the sum of weather processes that constitute the climate. This interpretation would argue that the climatic shift observed since the 1970s corresponds to the setting of an accelerated mode of circulation, which historically has been associated with cooling during the late Quaternary palaeoclimatic evolution, and its meteorological consequences: contrasted weather, stronger mid-latitude storms, increase water vapour in the troposphere and impermanent anticyclonic stability over continents leading to vigorous cold snaps in winter and heatwaves in summer.[5] He argued against the validity of a global mean temperature curve as a major climatic proxy and criticized the prevailing scientific view that weather changes observed in the second half of the 20th century were the consequence of an anthropogenic global warming created by the release of greenhouse gases due to industrial and human activities.[1]
      In general, he claimed that his hypotheses provide the meteorological mechanism for past glaciations and de-glaciations, improve meteorological prediction models and climate simulation accuracy in constraining them through the real geometry of atmospheric circulation, its discontinuities, energy exchanges and their associated clouds.[5]
      The English 2nd edition of "Dynamic Analysis of Weather and Climate, Atmospheric Circulation, Perturbations, Climatic Evolution" was completed in 2008 two months before his death and published in January 2010.[5]
      [edit]Awards

      Certificate conferring the Ordre des Palmes Academiques to Dr. Leroux
      Leroux was made a chevalier (knight) in the Ordre des Palmes académiques on 31 October 2002.
      [edit]References

      ^ a b Leroux, Marcel (2005-08-30) (Hardcover). Global Warming - Myth Or Reality?. Springer Praxis. p. 510. ISBN 3-540-23909-X.
      ^ a b Leroux M. (1983). Le climat de l'Afrique tropicale (PhD thesis). Paris/Genève: H. Champion/M. Slatkine.
      ^ Leroux, Marcel (2002-01-01) (Hardcover). The Meteorology and Climate of Tropical Africa. Springer Praxis. p. 548. ISBN 3-540-42636-1.
      ^ a b Marcel Leroux (1993). "The Mobile Polar High: a new concept explaining present mechanisms of meridional air-mass and energy exchanges and global propagation of palaeoclimatic changes". Global and Planetary Change (Elsevier Science Publishers) 7: 69-93.
      ^ a b c d Leroux, Marcel. “Dynamic Analysis of Weather and Climate Atmospheric Circulation, Perturbations, Climatic Evolution”, Springer-Praxis books in Environmental Sciences, 2nd ed., 2010, 440p., ISBN 978-3-642-04679-7
      [edit]External links

      Laboratoire de Climatologie, Risques, Environnement
      Marcel Leroux no longer with us, European Tribune, Aug 14th, 2008

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