Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun organic chemistry Any
unsaturated aliphatic ketone . - noun biochemistry Any
long-chain di-, tri- and tetra- unsaturated methyl and ethyl ketones that aresynthesized by a limited number ofhaptophyte microalgae ; the degree of unsaturation is a function of the watertemperature .
Etymologies
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Examples
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The SST reconstructions were stated in the article to be limited to alkenone proxies because of the need for “consistency”.
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I guess that since the Lorenz paper stated it wanted to use only alkenone proxies to be “consistent” that it meant that they did not want to even mention other proxy papers.
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The alkenone-derived SST records show diverging linear trends over the last 7000 years Figures 3 and 4a.
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Lorenz et al. 2006 give a less than confident observation of phytoplankton growth and the resulting relationship of the alkenone proxy relationship to seasonal temperatures:
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They go on to attempt to show that computer model climate simulations can provide seasonal change resolution for the Holocene Optimum period to present that the alkenone results cannot.
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Since the tropics and extra tropics have nearly equal areas we can say that from the alkenone data alone that 7000 years BP was globally about 0.61 degrees C warmer than present.
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The alkenone proxies are to be relegated to a measure of seasonal temperature that, while being higher than today, is averaged out by lower temperatures in seasons as computer runs indicate when the alkenone proxy was temperature insensitive or dormant if you will.
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Their proxy is alkenone SST estimates collated in the following location: a site which unfortunately is password protected.
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That is why I am interested in seeing other proxy data from this period that is not as seasonal as the alkenone proxy is claimed to be and something that might test the computer simulations results for seasonal variations.
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From the alkenone proxy data in Lorenz (2006), I calculated average tropic and extratropic temperature changes to present and came up with: tropics (30N to 30S) change from 7000 years BP (the Holocene Optimum) to present = 0.23 degrees C and for the extratropics (all other areas of the globe) this change = -1.45 degrees C.
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