305
edits
En-en adult card 12 carbon sinks: Difference between revisions
m
no edit summary
m (Minor corrections) |
mNo edit summary |
||
| Line 19: | Line 19: | ||
* What type of graph? A "filled" curve | * What type of graph? A "filled" curve | ||
* What is the legend? The same as for CO<sub>2</sub> emissions. | * What is the legend? The same as for CO<sub>2</sub> emissions. | ||
==Correction== | ==Correction== | ||
===Causes=== | ===Causes=== | ||
| Line 37: | Line 35: | ||
*[[En-en adult card 32 decline agricultural yields|Decline in agricultural yields]] Studies have shown that yields increase with increased CO<sub>2</sub>, but that the nutrient content of vegetables is reduced as a result, because trace elements are not more abundant when yields increase. | *[[En-en adult card 32 decline agricultural yields|Decline in agricultural yields]] Studies have shown that yields increase with increased CO<sub>2</sub>, but that the nutrient content of vegetables is reduced as a result, because trace elements are not more abundant when yields increase. | ||
== To go further == | == Wrong links== | ||
===Wrong consequences=== | |||
*[[En-en adult card 14 energy budget|Energy budget]] The idea here is not to say there is no link between these two cards, but to make sure they are not mixed up. The carbon sinks card tells us where the carbon goes. The energy budget card tells us where the excess energy goes. Both distribute something, but not the same thing. To make it even more confusing, the atmosphere and the ocean are present in both. | |||
==To go further== | |||
=== Variation in photosynthesis === | ===Variation in photosynthesis=== | ||
On this card, we can see that in some years photosynthesis drops to 0, and varies greatly from one year to another. The explanation comes from the fact that the residual carbon sink is calculated from the remaining value of the other variables<ref>[https://www.ipcc.ch/site/assets/uploads/2018/03/WG1AR5_SummaryVolume_FINAL_FRENCH.pdf#page=66 Page 66 of IPCC's Fifth report summary - Working group #1 (French)]</ref>. This is why negative values are sometimes found. In this graph, emissions and their distribution only include flows that have varied since 1750, without the natural CO<sub>2</sub> flows, such as CO<sub>2</sub> degassing from lakes, rivers and oceans. However, the IPCC does not clearly explain why such a variation can be read on the graph. | On this card, we can see that in some years photosynthesis drops to 0, and varies greatly from one year to another. The explanation comes from the fact that the residual carbon sink is calculated from the remaining value of the other variables<ref>[https://www.ipcc.ch/site/assets/uploads/2018/03/WG1AR5_SummaryVolume_FINAL_FRENCH.pdf#page=66 Page 66 of IPCC's Fifth report summary - Working group #1 (French)]</ref>. This is why negative values are sometimes found. In this graph, emissions and their distribution only include flows that have varied since 1750, without the natural CO<sub>2</sub> flows, such as CO<sub>2</sub> degassing from lakes, rivers and oceans. However, the IPCC does not clearly explain why such a variation can be read on the graph. | ||
It can be added that the atmospheric concentration has increased sharply in years with an El Niño phenomenon because it makes it difficult for vegetation to absorb carbon<ref>[https://www.globalcarbonproject.org/carbonbudget/19/files/GCP_CarbonBudget_2019.pdf#page=48 The Global Carbon Project, 2019]</ref>. | It can be added that the atmospheric concentration has increased sharply in years with an El Niño phenomenon because it makes it difficult for vegetation to absorb carbon<ref>[https://www.globalcarbonproject.org/carbonbudget/19/files/GCP_CarbonBudget_2019.pdf#page=48 The Global Carbon Project, 2019]</ref>. | ||
=== Carbon sinks capacity === | ===Carbon sinks capacity=== | ||
[https://jancovici.com/changement-climatique/gaz-a-effet-de-serre-et-cycle-du-carbone/les-puits-de-carbone-ne-vont-ils-pas-absorber-le-surplus-de-co2/ Jean-Marc Jancovici’s web site - Won't "carbon sinks" absorb excess CO<sub>2</sub>? (French)] | [https://jancovici.com/changement-climatique/gaz-a-effet-de-serre-et-cycle-du-carbone/les-puits-de-carbone-ne-vont-ils-pas-absorber-le-surplus-de-co2/ Jean-Marc Jancovici’s web site - Won't "carbon sinks" absorb excess CO<sub>2</sub>? (French)] | ||
== References == | ==References== | ||
<references /> | <references /> | ||
[[fr:Fr-fr_adulte_carte_12_puits_de_carbone]] | [[fr:Fr-fr_adulte_carte_12_puits_de_carbone]] | ||