Bon anniversaire, Chinggis ! _Temuujin_ , Altan Urag

#agriculture #climat #irrigation

Genghis Khan, conqueror of the world, diverter of rivers.

Hello #Chinggis !, bientôt, ton anniversaire : 24/11/2014, jour férié (mobile) en Mongolie : #Jour_de_la_fierté_mongole

cf. ▻http://seenthis.net/messages/192030

Ceci dit, dans l’article pointé :

We still aren’t sure exactly what caused such extreme regression, but a cooler, drier climate played a role. The 13th century Mongol invasion of central Asia also led to the Amu Dar’ya, one of two major rivers that feed the Aral, being diverted to the Caspian Sea. Clearly humans were a major factor in the Aral’s previous dry spell.

se trouve un lien (sous diverted to the Caspian Sea) malheureusement sous #paywall, mais dont le résumé dit pratiquement le contraire…

Archaeology and climate : Settlement and lake-level changes at the Aral Sea - Boroffka - 2006 - Geoarchaeology - Wiley Online Library
▻http://onlinelibrary.wiley.com/doi/10.1002/gea.20135/abstract

New archaeological and geomorphologic data collected adjacent to the Aral Sea show lake-level stands during the late Pleistocene and the past 5000 years. On the northern and southern shores, archaeological sites from the Palaeolithic through the Late Middle Ages contain evidence of various cultures and economies. Changes in settlement activity during the mid-Holocene are related to several major lake-level oscillations. Some of them, especially those which occurred at approximately 350–450 cal B.P. (during the Little Ice Age), 700–780 cal B.P., around 1400 cal B.P., and 1600–2000 cal B.P., were accompanied by lithological changes in sediment cores retrieved from the Aral Sea and were observed in shoreline shifts. We show that a maximum lake level at 72–73 m above sea level cannot be corroborated. The highest lake level, which was reached at the beginning of the 20th century, probably never exceeded 54–55 m a.s.l. Furthermore, we documented a previously unknown low-level stand at 42–43 m a.s.l. that dated to the Bronze Age (∼4000–3000 B.P.). The regression during 1200–1300 cal A.D. was formerly underestimated and was lower than the present-day lake level. The observed environmental changes, except those since the 1960s, are most probably driven by climate variability, though human activities (e.g., irrigation) can amplify the impact.