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2018-09-19

En enastående ökning av jordens grönska

"Vi har länge kunnat glädjas åt bevisen från satelliter om att planetens grönska ökar på grund av koldioxiden." Michaels

Climate etc: The most amazing greening on Earth

Av Patrick J. Michaels

We’ve long been fond of showing the satellite evidence for planetary greening caused by increasing carbon dioxide.

The variable usually shown is the Leaf Area Index (LAI), an interesting measure of vegetation density. A value of 1.00 means that one square meter of the sensed vegetation, if the leaves were spread out, would entirely cover a square meter.

Plants with exceedingly dense vegetation (think of your over-fertilized tomato plants by the end of summer) have LAI values far in excess of 1.0, and some, such as sparse grasslands, may be quite a bit less than 1.0, indicating the presence of a lot of bare ground.

A new paper by Simon Munier, of France’s Centre National de Recherches Météorologiques, and several co-authors, segregates satellite-sensed LAI data into different vegetation types, taken over the period 1999-2015. This allows the researchers to quantitatively determine the amount of greening that is taking place over time, depending upon the vegetation type.

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Taggar: Patrick J. Michaels Greening Climate etc

Red: Hans Iwan Bratt. epost: hibratt@gmail.com.