The measurements at MLO, Barrow, Samoa, south pole represent 95 % of the atmosphere, where
only seasonal variations and a continuous increase are seen, not (or limited) the influence of local / regional biological decay or uptake, car exhausts or chimneys as in 5 % of the atmosphere over land where such variations are measured for other reasons than a global CO2 level...
The only seasonal variations are denoted in terms of the amount of rainfall, usually divided into the «dry season» and the «green season».
Not exact matches
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In fact, we have a deep biological relationship with light: its diurnal
variation is vital for the well - being of most of Earth's inhabitants, regulating not
only circadian rhythms but also
seasonal variations.
The
seasonal variation in the earth's global average sea surface temperature is
only about 0.5 degrees Kelvin, being hotter in April and colder in October (see e.g. http://discover.itsc.uah.edu/amsutemps/execute.csh?amsutemps).
The ARGO measurements of ocean temperatures with depth shows that the
seasonal variation penetrates hundreds of meters deep with a lag of
only a few months or around 3 months, 1/4 of a period, to be more precise.
With or without the
seasonal variation, the basic proiblem remains the same: you
only fit to two points and model systematically deviates from the form of MLO.
However, the «wiggles» and the range provided by the
seasonal variation enable almost any curve to be fitted to the data because the data
only exists for the short time since 1958.
The
only plausible explanation of the annual wiggle and its
variation with latitude is that it is due to the
seasonal growth and decay of annual vegetation, especially deciduous forests, in temperate latitudes north and south.
For me personally, my
ONLY interest in the CO2 lumpiness, is that it can lead to some understanding of what mechanisms are causing
seasonal CO2
variations.