Daily atmosphere carbon dioxide concentration

חינם
על ידי Rene R. | מְעוּדכָּן 4 days ago | Science
פּוֹפּוּלָרִיוּת

9.3 / 10

חֶבִיוֹן

115ms

רמת שירות

100%

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N/A

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Description of Parameters

Rapid account: Sudo Kaizen
sudo-kaizen
3 years ago

The API supplies 5 parameters, 3 of which are clear - the date-based parameters.
cycles and trends are quite unclear. Can anyone provide information about
what they mean and what their units are?

Rapid account: Sammorley Short
sammorley-short Commented 3 years ago

Taking a look at the API’s source code on github, this API is just pulling the data from NOAA. Specifically, it is simply executing the FTP request: ftp://aftp.cmdl.noaa.gov/products/trends/co2/co2_trend_gl.txt. Taking a look at this file, the documentation is as follows:

Estimated CO2 Daily Global Seasonal Cycle and Trend (ppm).
The estimated daily global seasonal cycle and trend value for CO2 are determined from the daily averaged CO2 data from the four NOAA GML Baseline observatories. A smoothed seasonal cycle and a smoothed de-seasonalized trend curve are determined for each observatory record at daily intervals. An estimated global seasonal cycle and trend are computed by averaging the four individual observatory seasonal cycle and trend curves at each daily interval.
For details on the curve fitting process see
https://www.esrl.noaa.gov/gmd/ccgg/mbl/crvfit/crvfit.html
CO2 is expressed as a mole fraction in dry air, micromol/mol, abbreviated as ppm
NOTE: In general, the data presented for the last year are subject to change, depending on recalibration of the reference gas mixtures used, and other quality control procedures. Occasionally, earlier years may also be changed for the same reasons. Usually these changes are minor.

Rapid account: Chilupa
chilupa Commented 3 years ago

I have the same question. Can someone tell what are cycles and trends ?

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