Abstract
Chapter 2 treats simple models of climate dynamics. It begins by describing radiative transfer in the atmosphere, with particular attention to the simple case of a grey, one-dimensional atmosphere. Following this, the convective temperature structure of the troposphere is discussed. The latter part of the chapter deals with energy balance models, in particular with a view to understanding ice age causes. This introduces successively the ice-albedo feedback mechanism, the carbon cycle in atmosphere and ocean, and the rôle of bicarbonate buffering in the ocean.
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- 1.
This overly simple description is inaccurate in one main respect, which is that the hemispheric polewards circulation actually consists of three cells, not one: a tropical cell, a mid-latitude cell and a polar cell. The prevailing winds are westerly (from the west) only in the mid-latitude cells; tropical winds (the trade winds), for example, are easterlies (from the east).
- 2.
The analogy is probably rather loose, since it is more the absence of convective (rather than radiative) cooling of the greenhouse which causes its elevated temperature.
- 3.
This now specifically assumes that no other energy transport processes occur.
- 4.
The molecular weight is effectively the weight of a molecule of a substance. Equivalently, it is determined by the weight of a fixed number of molecules, known as a mole, and equal to Avogadro’s number 6×1023 molecules. For air, a mixture predominantly of nitrogen (78%), oxygen (21%) and argon (0.9%), the molecular weight is given by the equivalent quantity for the mixture. It has the value M a =28.8×10−3 kg mole−1. Useful references for such quantities and their units are Kaye and Laby (1960) and Massey (1986).
- 5.
This is something of a simplification. Net addition of radiant energy to the atmosphere can cause changes in sensible heat (via temperature), latent heat (via moisture) or gravitational potential energy (via thermal expansion); we thus implicitly neglect the latter two; see also Eq. (3.25) in Sect. 3.2.3, and the next footnote.
- 6.
For a moist, saturated atmosphere, we may take the moisture mixing ratio m to be a function of T, and in this case the latent heat ρ a Lm (L being latent heat) simply modifies the heat capacity coefficient. Question 2.11 shows how to calculate m(T). See also Sect. 3.2.7.
- 7.
The value of A assumes T is measured in degrees Celsius.
- 8.
This is not the only possible mechanism. Another is the North Atlantic salt oscillator, discussed in Sect. 2.5.7.
- 9.
The problems of plate tectonics are discussed in Chap. 8.
- 10.
The units here are in terms of silica, SiO2. If we suppose that weathering is described by the reaction (2.129), then one mole of CO2 (of weight 44 grams) is used to produce one mole of SiO2 (of weight 60 grams). So to convert units of kg(SiO2) m−2 y−1 to units of kg(CO2) m−2 y−1, multiply by 44/60≈0.73.
- 11.
The current net annual addition of CO2 to the atmosphere because of fossil fuel consumption and deforestation is about 3.5 Gt carbon, or 1.3×1013 kgCO2 y−1; this is forty times larger than the volcanic production rate. (The actual rate of addition is more than twice as large again, but is compensated by net absorption by the oceans and in photosynthesis.)
- 12.
In fact the corrected approach is to assume charge neutrality, but allowing for the net negative charge of the conservative ions: chloride, sodium, etc.
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Fowler, A. (2011). Climate Dynamics. In: Mathematical Geoscience. Interdisciplinary Applied Mathematics, vol 36. Springer, London. https://doi.org/10.1007/978-0-85729-721-1_2
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