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Earth's plant life: dying on land, dying at sea

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Headlined to H2 8/22/10

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CO2 is plant food. I know this is true, because smart Republicans like Reps. Dan Shimkus and Michele Bachmann said so. In fact, the "CO2 is plant food" meme can bring up 48,000 hits on Google.

So rising CO2 should be good for plants, right? Because a conservative argument with a patina of science just can't be wrong.

Just a couple of little flies in the ointment:land plants are dyingas CO2 rises. Andoceanic plants are dyingas CO2 rises, too.

Earth's plant life is being killed by the heat.

This week's edition of the journal Science contains a paper by Maosheng Zhao and Steven W. Running concerning the reaction of land plants to climate change. Zhao and Running have been measuring terrestrial net primary production (NPP), which is a measure of how much carbon land plants take in and store as part of their structures. While earlier measures looked good (NPP rose in the '90s), over the past decade the picture is grim: as CO2 has been rising, NPP has been falling in lockstep. Plants are not keeping up with human CO2 production. Which means that the ability of land plants to act as a carbon sink in actually weakening as time goes on.

NPP is tricky to measure though it takes a complex model with a lot of inputs. But there is another way to measure the growth (or decline) of land plants, and that is by satellite measurement. NOAA's annual State of the Climate report is a must-read for anyone interested in the guts of climate science today.

One of the most depressing facts in this report is an indicator called the Fraction of Absorbed Photosynthetically Active Radiation, or FAPAR. Photosynthesis uses only very narrow parts of the spectrum, so you can look down at the earth and see how much of those frequencies are being absorbed on the Earth. Essentially, FAPAR is a measure of how much photosynthesis is going on -- or how much plants are growing. From space, FAPAR can be measured over land areas quite easily, and has been measured since 1998. And the picture isn't good.

We've lost about 1.5% of global land-plant growth over the past 12 years. Interestingly, this loss is concentrated in the southern hemisphere, as seen in this graphic:

Although plant growth has declined in the Northern temperate zone and in the tropics, the Southern temperate zone has seen the steepest declines. This is because climate-change driven drought has hit the Southern hemisphere the hardest. If conditions in Russia are any indication, however, the Northern Hemisphere won't be far behind.

*******

Three weeks ago in Nature, the world's oldest scientific journal (and one of the most respected), Daniel G. Boyce, Marlon R. Lewis & Boris Worm report on a study they undertook to determine global phytoplankton concentration over the 20th century.


Phytoplankton are tiny single-celled marine plants that form the base of the ocean's food chain. Everything that swims in the sea depends on phytoplankton either directly or indirectly as a food source. More important, phytoplankton are responsible for about half of the photosynthesis (read: oxygen) on earth.

But phytoplankton are difficult to study, because the level of phyoplankton in the sea varies radically, by several orders of magnitude (that's by thousands of times), and those variations are seasonal, and regional, and there's a bunch of random noise too. So you need a lot of data over a long time period to make sense of what's going on in the long term. And Boyce et. al. have finally got the data.

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articles reprinted from Dailykos.com
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Will we heed what science tells us about climate c... by Philip Pease on Sunday, Aug 22, 2010 at 9:38:16 AM
well Hey! Let's have a mass suicide party!It will ... by Daniel Geery on Sunday, Aug 22, 2010 at 10:14:44 AM
Though in some circles it's politically incorrect ... by Laura Stein on Sunday, Aug 22, 2010 at 10:51:49 AM
I have long called for a substantial payment to pe... by wagelaborer on Sunday, Aug 22, 2010 at 2:06:23 PM
Offer inmates a year off their sentence if they ag... by Adam Smith on Sunday, Aug 22, 2010 at 5:52:04 PM
No, everybody is eligible.This isn't a eugenics id... by wagelaborer on Monday, Aug 23, 2010 at 9:35:42 AM
But I sure as hell can't!And ditto the comment bel... by Daniel Geery on Sunday, Aug 22, 2010 at 4:01:18 PM
As the ocean's warm up, oxygen is less available t... by Laura Stein on Sunday, Aug 22, 2010 at 9:55:11 AM
Finally, the next time someone claims ..., you can... by PrMaine on Sunday, Aug 22, 2010 at 10:01:55 AM
Global warming is not one of them and what we shou... by Mike Preston on Sunday, Aug 22, 2010 at 10:25:55 AM
"The reason we get global warming alarmist (sic) o... by Laura Stein on Sunday, Aug 22, 2010 at 11:15:47 AM
The ruling class calls for cap and trade, not carb... by wagelaborer on Sunday, Aug 22, 2010 at 1:48:25 PM
... by Laura Stein on Thursday, Aug 26, 2010 at 10:03:52 AM
Mr. Preston,you need to come back to earth immedia... by liberalsrock on Sunday, Aug 22, 2010 at 3:23:38 PM
FDR put people to work planting trees, to stop soi... by wagelaborer on Sunday, Aug 22, 2010 at 1:53:45 PM