4,024,776,626,758,050

Total Atmospheric CO2e: 4,024.78 Gt

CO₂ at Mauna Loa (weekly average)

Week of May 22, 2011: 394.97 ppm

• Weekly value from 1 year ago:   393.06 ppm
• Weekly value from 10 years ago:   373.93 ppm

Based on the above data, total atmospheric CO2 TODAY:

3,081,994,507,051.11 Mt [3,082Gt]

Combined impact of Nitrous Oxide (N2O), Methane (CH4) and CFC 12 ( CCl2F2) calculated at their full global warming potential: 30.59% of the CO2 Impact, or the CO2 equivalent of

942,782,119,706.94 Mt CO2e [942 Gt CO2e]

Effective Total: 4,024.78 GtCO2e

[MT: Metric Tons;  Gt: Gigatons; CO2e: Carbon Dioxide Equivalent; ppm: parts per million by volume]

Trends in Atmospheric Carbon Dioxide (ESRL)

The graph, updated weekly, shows as individual points daily mean CO₂ up to and including the week (Sunday through Saturday) previous to today. The daily means are based on hours during which CO₂ was likely representative of “background” conditions, defined as times when the measurement is representative of air at mid-altitudes over the Pacific Ocean. That air has had several days time or more to mix, smoothing out most of the CO₂ variability encountered elsewhere, making the measurements representative of CO₂ over hundreds of km or more. The selection process is designed to filter out any influence of nearby emissions, or removals, of CO₂ such as caused by the vegetation on the island of Hawaii, and likewise emissions from the volcanic crater of Mauna Loa. For details, see ”How we measure background CO2 levels at Mauna Loa”. The same measurement principles also apply elsewhere. The weekly mean (red bar) is simply the average of all days in the week for which a background value could be defined. The average standard deviation of day to day variability, calculated as the difference from the appropriate weekly mean, equals 0.38 ppm for the entire record. As a visual aid, the blue lines present monthly means of background data as they are presented under Recent Monthly CO₂ at Mauna Loa. These data are still preliminary, pending recalibrations of reference gases and other quality control checks. Image and Caption: ESRL.  Click images to enlarge.

This figure shows the atmospheric increase of CO₂ over 280 ppm in weekly averages of CO₂ observed at Mauna Loa. The value of 280 ppm is chosen as representative of pre-industrial air because it is close to the average of CO₂ measured and dated with high time resolution between the years 1000 and 1800 in an ice core from Law Dome, Antarctica. [Etheridge et al., 1996]. Although the time resolution of old air locked in ice cores is not enough to preserve seasonal cycles, there is no doubt that the seasonal cycle, which is mostly caused by photosynthesis and respiration of ecosystems on land, was similar to what we observe today. Therefore, for the comparison with pre-industrial times the Mauna Loa weekly data have been first deseasonalized by subtracting the observed average seasonal cycle, and then subtracting 280 ppm. The enhancement of the CO₂ mole fraction in the atmosphere over pre-industrial is expressed both as ppm and as a percentage change since the year 1800. Data are reported as a dry air mole fraction defined as the number of molecules of carbon dioxide divided by the number of all molecules in air, including CO₂ itself, after water vapor has been removed. The mole fraction is expressed as parts per million (ppm). Example: 0.000400 is expressed as 400 ppm.  Image and Caption: ESRL 

CO2 emissions reach a record high in 2010

Energy-related carbon-dioxide (CO2) emissions in 2010 broke all previous records, according to the latest estimates by the International Energy Agency (IEA).

Recent Mauna Loa CO₂

The graph shows recent monthly mean carbon dioxide measured at Mauna Loa Observatory, Hawaii.

The last four complete years of the Mauna Loa CO₂ record plus the current year are shown. Data are reported as a dry air mole fraction defined as the number of molecules of carbon dioxide divided by the number of all molecules in air, including CO₂ itself, after water vapor has been removed. The mole fraction is expressed as parts per million (ppm). Example: 0.000400 is expressed as 400 ppm.

In the above figure, the dashed red line with diamond symbols represents the monthly mean values, centered on the middle of each month. The black line with the square symbols represents the same, after correction for the average seasonal cycle. The latter is determined as a moving average of SEVEN adjacent seasonal cycles centered on the month to be corrected, except for the first and last THREE and one-half years of the record, where the seasonal cycle has been averaged over the first and last SEVEN years, respectively.

The last year of data are still preliminary, pending recalibrations of reference gases and other quality control checks. The Mauna Loa data are being obtained at an altitude of 3400 m in the northern subtropics, and may not be the same as the globally averaged CO₂ concentration at the surface.   Image and Caption: ESRL

Full Mauna Loa CO₂ record

Monthly mean atmospheric carbon dioxide at Mauna Loa Observatory, Hawaii – The carbon dioxide data (red curve), measured as the mole fraction in dry air, on Mauna Loa constitute the longest record of direct measurements of CO₂ in the atmosphere. They were started by C. David Keeling of the Scripps Institution of Oceanography in March of 1958 at a facility of the National Oceanic and Atmospheric Administration [Keeling, 1976]. NOAA started its own CO₂ measurements in May of 1974, and they have run in parallel with those made by Scripps since then [Thoning, 1989]. The black curve represents the seasonally corrected data.

Data are reported as a dry mole fraction defined as the number of molecules of carbon dioxide divided by the number of molecules of dry air multiplied by one million (ppm).  Image and Caption: ESRL    -Data Set Available HERE

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