A hurricane bearing down on Hawaii prompted operators to shut down CO2 monitoring equipment at Mauna Loa Observatory on the Big Island. Continue reading Brief Reprieve from 400 PPM Era May Be Thanks to a Hurricane
CO2 levels increasing at a faster rate than before Continue reading Record Annual Increase of Carbon Dioxide Observed for 2015
Scripps Oceanography lab monitoring atmospheric CO2 named National Historic Chemical Landmark
Continue reading American Chemical Society to Honor Keeling Curve in June 12 Ceremony
Repost of April 2013 entry
The Mauna Loa carbon dioxide (CO2) record, also known as the “Keeling Curve,” is the world’s longest unbroken record of atmospheric carbon dioxide concentrations.
Continue reading What Does This Number Mean?
The Scripps Institution of Oceanography, UC San Diego O2 and CO2 programs have received funding from multiple sources that put these operations on a relatively secure footing for the next few years. Continue reading A Keeling Curve Funding Update – April 2015
The rate of growth in carbon dioxide concentrations in the atmosphere has accelerated since the beginnings of the Keeling Curve. Continue reading Is the Rate of CO2 Growth Slowing or Speeding Up?
The story of the Keeling Curve is beautifully animated in this new video. The American Museum of Natural History will host a Google+ Hangout Sept. 9, 2014 on the topic of the Keeling Curve.
In response to a recent reader comment about wide fluctuations in CO2 readings at Mauna Loa, Ralph Keeling and Stephen Walker of the Scripps CO2 Group gave the following answer:
It’s fairly normal, especially in the summer time, to see strong afternoon “dips” in the CO2 concentration. The dips are generally caused by upslope winds that that are depleted in CO2 by photosynthesis at lower elevations. In the last few days have had very large swings of this sort showing the island influences can be strong. We do our best to exclude these island influences from the record by retaining only data when the concentration is stable for many hours. How unusual are the large recent swings? The magnitudes of the swings can vary significantly from year to year, with daily dips greater than 10ppm seen in some years. So the recent oscillations observed in a single day of about 6ppm are well within the range of normal variability.
Scientists make CO2 measurements in remote locations to obtain air that is representative of a large volume of Earth’s atmosphere and relatively free from local influences that could skew readings. Continue reading How are CO2 Data Processed?
In a recent comment, a reader posted a graphic in which CO2 and sea-level rise appear to be correlated throughout the last 700,000 years. Continue reading How do CO2 levels relate to ice ages and sea-level?