20 - Perturbação do ciclo da água
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Esta carta é importante: sozinha consegue ilustrar porque é que antes falávamos de Aquecimento Global, depois de Alterações Climáticas, e agora até de Desregulação Climática. O aumento da temperatura é por si só um problema, mas vemos no mural, no final, que a perturbação do ciclo da água tem muito mais efeitos.
3Causes
A evaporação que ocorre na superfície do oceano aumenta se a água e o ar aquecerem. Isso cria mais nuvens e, em seguida, precipitação. FONTES: AR6 WG1 Box TS.6 p54 // AR6 WG1 FAQ 8.3 p50
Weakening of thermohaline circulation may disrupt water cycle even more in many places in the word.
6Consequences
1Other possible cause
Deforestation can perturb local precipitation.
2Other possible consequences
It's a bit technical, but the blue part of the map of Antarctica on card 19 represents a gain in mass due to an increase of precipitations. The red part represents a loss in mass. In total, Antarctica is losing mass.
The Vectors of disease card is generally linked to the Terrestrial Biodiversity card because disease vectors are a sub-part of biodiversity, but it can also be linked to the same causes as the biodiversity card, i.e. Disruption of the Water Cycle and Rising Air Temperatures.
1Wrong cause
The melting of the Arctic ice pack, but also the melting of Greenland's glaciers may lead, in the distant future, to a disruption of the thermohaline circulation (which gives rise to the Gulf Stream). But beware, the "Water Cycle" card does not refer at all to the thermohaline circulation.
1Wrong consequence
No, more rain is not going to cause the oceans to overflow! This is a rare mistake to be made, but if it happens to you, ask the players where rainclouds come from...