How does rising atmospheric CO2 affect marine organisms?

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Temple Hill Moss, Southeast Scotland, United Kingdom
Langdon, P.G., Barber, K.E. and Hughes, P.D.M. 2003. A 7500-year peat-based palaeoclimatic reconstruction and evidence for an 1100-year cyclicity in bog surface wetness from Temple Hill Moss, Pentland Hills, southeast Scotland. Quaternary Science Reviews 22: 259-274.

The authors analyzed plant macrofossils, peat humification and testate amoebae to reconstruct a proxy climate record spanning the last 7500 years of an ombrotrophic bog, Temple Hill Moss, in southeast Scotland. This work revealed, in their words, "a millennial scale periodicity of 1100 years" that provided "evidence for a drier/warmer phase between ca cal. 1000-800 BP, and a climatic deterioration between ca cal. 250-150 BP, which may relate to phases of warmer and then cooler climates such as the Medieval Warm Period and Little Ice Age, respectively."