Via the Hockey Schtick:
A paper published Friday in Climate of the Past reconstructs water pH and temperature from a lake in central Japan over the past 280,000 years and clearly shows that pH increases [becomes more basic or alkaline] due to warmer temperatures, and vice-versa, becomes more acidic [or “acidified” if you prefer] due to cooling temperatures. This finding is the opposite of the false assumptions behind the “ocean acidification” scare, but is compatible with the basic chemistry of Henry’s Law and outgassing of CO2 from the oceans with warming.
Thus, if global warming resumes after the “pause,” ocean temperatures will rise along with CO2 outgassing, which will make the oceans more basic, not acidic. You simply cannot have it both ways:
“Either the oceans are getting warmer and the CO2 concentration in seawater is decreasing, which means that ocean acidification from man-made CO2 from the atmosphere is nonsense.
Or the oceans are getting cooler and the man-made CO2 from the atmosphere is dissolving in those cooler oceans and causing – insignificant – ocean acidification, which means that warming oceans and the associated sea level rises are nonsense.
Take your pick – REAL SCIENCE says you can’t have both.”
In addition, the paper shows that pH of the lake varied over a wide range from ~7.5 to 8.8 simply depending on the temperature of each month of the year. As the “acidification” alarmists like to say, a variation of 1.3 pH units is equivalent to a 1995% change in hydrogen ions due to the logarithmic pH scale, just over a single year! Summer months are of course associated with warmer temperatures and more alkaline, higher pH and winter months associated with colder temperatures and much more “acidified” lower pH values. Note also how pH varies widely over ~7.5 to 8.8 simply dependent on the depth at a given time, because colder deeper waters can hold higher partial pressures of CO2 than the warmer surface waters:
“Comparison with pollen assemblage in Lake Biwa cores suggests that lake water pH was determined by summer temperature in low-eccentricity periods, while it was determined by summer precipitation in high-eccentricity periods. From 130 to 55 ka, variation in lake pH (summer precipitation) lagged behind that in summer temperature by several thousand years.”
These findings completely contradict the basis of the CAGW “acidification” scare and instead show that warming should make the oceans more alkaline, not “acidic.”
Clim. Past, 10, 1843-1855, 2014
1Graduate School of Environmental Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo 060-0810, Japan
2Faculty of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo 060-0810, Japan
3Institute for Geothermal Science, Kyoto University, Noguchihara, Beppu, Ohita 874-0903, Japan
4Department of Environmental Systems Science, Doshisha University, 1–3 Tatara-Miyakodani, Kyotanabe, Kyoto 612-0321, Japan
5Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan
We generated a 280 000 yr record of water pH and temperature in Lake Biwa, central Japan, by analysing the methylation index (MBT′) and cyclisation ratio (CBT) of branched tetraethers in sediments from piston and borehole cores. Our aim was to understand the responses of precipitation and air temperature in central Japan to the East Asian monsoon variability on orbital timescales. Because the water pH in Lake Biwa is determined by phosphorus and alkali cation inputs, the record of water pH should indicate the changes in precipitation and temperature in central Japan. Comparison with a pollen assemblage in a Lake Biwa core suggests that lake water pH was determined by summer temperature in the low-eccentricity period before 55 ka, while it was determined by summer precipitation in the high-eccentricity period after 55 ka. From 130 to 55 ka, the variation in lake pH (summer precipitation) lagged behind that in summer temperature by several thousand years. This perspective is consistent with the conclusions of previous studies (Igarashi and Oba, 2006; Yamamoto, 2009), in that the temperature variation preceded the precipitation variation in central Japan.