How does rising atmospheric CO2 affect marine organisms?

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Lake WB02, Northern Victoria Island, Nanavut, Canada
Fortin, M.-C. and Gajewski, K. 2010. Holocene climate change and its effect on lake ecosystem production on Northern Victoria island, Canadian Arctic. Journal of Paleolimnology 43: 219-234.

Working with two replicate sediment cores extracted from the central point of Lake WB02 in the Wynniatt Bay region of Canada's Northern Victoria Island (72.29N, 109.87W), which were collected in June of 1997, the authors developed an 8,000-year history of the area's mean July air temperature, based upon the modern analogue technique (MAT) and weighted averaging partial least squares (WAPLS) regression, utilizing chironomid species assemblage data. As best we can determine from their graphical results, late-Holocene temperatures peaked about 1100 years ago in both reconstructions, at values that were (1) approximately 3.8C warmer than the peak temperature of the Current Warm Period (CWP), which occurs at the end of their record in the AD 1990s in their MAT analysis, and (2) approximately 1.0C warmer than the peak temperature of the CWP, which also occurs at the end of their record in their WAPLS analysis. Thus, we have two separate results for Lake WB02: MWP 3.8C > CWP, and MWP 1.0C > CWP. And we assign the MWP to the period AD 1050-1150, following our protocol which states that "in extremely rare cases where only a single year is specified for the MWP, we assign it a 100-year timespan centered on the year reported by the study's authors."