A Tropical Plant’s Warmth Threshold Affirms Mid-Holocene Temps Were ‘7.7°C Higher Than Today’

Warmth-demanding plant species can provide us with solid evidence of a much warmer-than-today Mid-Holocene climate.

Growth of the tropical aquatic plant 𝐶𝑒𝑟𝑎𝑡𝑜𝑝𝑡𝑒𝑟𝑖𝑠 ceases when air temperatures fall below 10°C.

A new study says that from about 8000 to 5000 years ago it was warm enough in winter that 𝐶𝑒𝑟𝑎𝑡𝑜𝑝𝑡𝑒𝑟𝑖𝑠 could grow at the 40°N latitude in northern China. Today its warmth threshold growth limit is ~34°N.

Scientists can therefore deduce the Mid-Holocene winter temperatures needed to have been “7.7°C higher than today” at that time.

Image Source: Zhang et al., 2022

Another warmth threshold species study allows us to determine Arctic Svalbard needed to have been 6°C warmer than today during the Early Holocene, as molluscs that today can only survive 1000 km south of where they did 9000 years ago affirm the climate was much warmer in the past.

Image Source: Mangerud and Svendson, 2018

 

via NoTricksZone

https://ift.tt/TWsoYKq

July 25, 2022 at 11:37AM

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s