If you can't explain the 'pause', you can't explain the cause...
Wednesday, June 25, 2014
Extreme global climate disruption causing extraordinary flooding, droughts, famine, death, war!...1600 years ago
A new paper published in Palaeogeography, Palaeoclimatology, Palaeoecology finds "extraordinary" extreme flood and drought disasters occurred in China over a 200 year period from 1800-1600 years ago and "resulted in frequent harvest failures, famines, social upheavals, and population reduction, invasions by nomads, and even the fall and replacement of the dynasties."
Flooding during this period was noted to be "about double the largest [recorded] flood that has occurred since 1976 along the Jin–Shaan Gorges."
The authors finds these extreme hydro-climatic events, "increased climatic variability and instability," and "climate decline" were "closely related to a global climatic event." How could that happen when CO2 was "safe"?
Extraordinary paleoflood events were found in the gorges, middle Yellow River.
Flood peak discharges were estimated to be 39,000–50,220 m3 s− 1 using HEC-RAS.
Slackwater deposits of the events were dated to 1800–1600 yr BP by the OSL method.
These hydrological events are closely related to a global climatic event.
New data in understanding rivers' responses to global change are presented.
Paleoflood slackwater deposits (SWDs) of the Holocene were found at many sites along the Jin–Shaan Gorges in the middle Yellow River basin. A set of four paleoflood SWD beds was identified at the Pingduguan (PDG) sites and studied by field observations and laboratory analysis including particle-size distribution and Optically Stimulated Luminescence (OSL) dating. Hydrological reconstruction using the HEC-RAS model shows that the paleoflood peak discharges were between 39,000 and 50,220 m3 s− 1. They are about double the largest gauged flood (24,000 m3 s− 1) that has occurred since 1976 along the Jin–Shaan Gorges. These extraordinary flood events were OSL dated to between 1800 and 1600 yr BP during which climatic deterioration and disasters were documented over the Yellow River basin. Various evidences show that severe flood and drought disasters during the episode resulted in frequent harvest failures, famines, social upheavals, and population reduction, invasions by nomads, and even the fall and replacement of the dynasties. Climate decline documented by proxy records such as tree-rings, stalagmites, ice-cores and lake sediments from over the world is in agreement with the paleoflood events identified along the Jin–Shaan Gorges. These mean that the extraordinary paleoflood events are closely related to increased climatic variability and instability. This result provides solid evidence for understanding the response of hydroclimatic system to global climate change in the semi-arid and sub-humid regions of the world.