Shadow on the Sun on Nostr: Are we really in a #climate emergency? I do not think so. Let's take a look to one of ...
Are we really in a #climate emergency? I do not think so. Let's take a look to one of the most vast droughts in Holocene epoch.
The 4.2-kiloyear event, also known as the 4.2 ka event, was a severe aridification event (long-term drought) that occurred around 2200 BC and likely lasted throughout the 22nd century BC.
Photo: Global distribution of the 4.2 kiloyear event
The term "BP" in "4.2-kiloyear BP event" means "Before Present," with the "Present" defined as January 1, 1950. This climatic event marks the beginning of the #Meghalayan age in the #Holocene epoch.
The 4.2 ka event is hypothesized to have triggered the collapse of several civilizations, including the Old Kingdom in #Egypt, the Akkadian Empire in #Mesopotamia, and the Liangzhu culture in the lower Yangtze River area. It may have also contributed to the decline of the Indus Valley #Civilization, causing population shifts, and the migration of Indo-European-speaking people into #India. However, some scientists argue that the event was not a global drought and lacked a clear timeline.
The event may have resulted from a significant weakening of the Atlantic meridional overturning circulation (AMOC), disrupting global ocean currents and causing shifts in precipitation and temperature patterns. An abrupt southward shift of the Intertropical Convergence Zone (ITCZ) and increased El Niño–Southern Oscillation (ENSO) variability may have also contributed to these climatic conditions. While explosive volcanism in #Iceland has been suggested as a potential cause, its impact is considered negligible due to the low sulphur content of Icelandic volcanoes.
The effects of the 4.2 ka event varied across different regions:
East #Asia The event led to a significant reduction in the strength of the East Asian Summer Monsoon (EASM), resulting in a stark humidity gradient between northern and southern #China.
#Korean Peninsula Significant aridification occurred.
Southern #Africa The region became wetter due to the southward shift of the ITCZ.
Recent research suggests that the impacts of the 4.2 ka event may not have been globally catastrophic as once thought but rather a series of smaller events impacting local climates.
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#Permaculture
#Nostr
#Climate_Change
The 4.2-kiloyear event, also known as the 4.2 ka event, was a severe aridification event (long-term drought) that occurred around 2200 BC and likely lasted throughout the 22nd century BC.
Photo: Global distribution of the 4.2 kiloyear event
The term "BP" in "4.2-kiloyear BP event" means "Before Present," with the "Present" defined as January 1, 1950. This climatic event marks the beginning of the #Meghalayan age in the #Holocene epoch.
The 4.2 ka event is hypothesized to have triggered the collapse of several civilizations, including the Old Kingdom in #Egypt, the Akkadian Empire in #Mesopotamia, and the Liangzhu culture in the lower Yangtze River area. It may have also contributed to the decline of the Indus Valley #Civilization, causing population shifts, and the migration of Indo-European-speaking people into #India. However, some scientists argue that the event was not a global drought and lacked a clear timeline.
The event may have resulted from a significant weakening of the Atlantic meridional overturning circulation (AMOC), disrupting global ocean currents and causing shifts in precipitation and temperature patterns. An abrupt southward shift of the Intertropical Convergence Zone (ITCZ) and increased El Niño–Southern Oscillation (ENSO) variability may have also contributed to these climatic conditions. While explosive volcanism in #Iceland has been suggested as a potential cause, its impact is considered negligible due to the low sulphur content of Icelandic volcanoes.
The effects of the 4.2 ka event varied across different regions:
East #Asia The event led to a significant reduction in the strength of the East Asian Summer Monsoon (EASM), resulting in a stark humidity gradient between northern and southern #China.
#Korean Peninsula Significant aridification occurred.
Southern #Africa The region became wetter due to the southward shift of the ITCZ.
Recent research suggests that the impacts of the 4.2 ka event may not have been globally catastrophic as once thought but rather a series of smaller events impacting local climates.
#Bitcoin
#Permaculture
#Nostr
#Climate_Change