Sometimes I read stuff and I just can’t figure out where these people have been.
Snow dominates Arctic ecosystems, covering the land surface for most of the year and influencing both the timing and magnitude of net ecosystem carbon dioxide exchange (NEE) between the land surface and the atmosphere. Uncertainties in estimates of Arctic NEE are most substantial during the long snow season, which complicates efforts by researchers to quantify the Arctic carbon cycle and monitor its responses to climate change.
You don’t say ….. hmmm ….. Fortunately, they give us pictures so we can follow along.
Acckkk!!!! Even with the pictures!!! ……. What does it all mean!!??!??!??!??
The central focus of our paper, published in Environmental Research Letters (ERL), was to determine whether model uncertainty in estimates of low Arctic NEE could be reduced by using satellite remote sensing observations to represent the influence of snow on NEE.
These investigations were informed primarily by observations of meteorology, NEE, and fractional snow cover area (SCA) collected within four locations at a low Arctic site (Daring Lake, NT, Canada) in May and June 2010. NEE was measured using the eddy covariance technique, and SCA was observed by classifying thrice daily time-lapse camera observations. ……
The findings indicate that model uncertainties were reduced when remote sensing observations of SCA were used to delineate the snow and growing seasons, allowing growing season respiration to be estimated according to air temperature, and snow season respiration to be estimated according to soil temperature. This model formulation captures the insulating influence of snow, which maintains warm soil temperatures conducive to soil respiration in spite of sub-zero air temperatures.
Right, it does seem that snow cover may just play a part in the growing seasons and the CO2 exchanges between the atmosphere and the ground level.
I wonder what a graph of monthly CO2 changes (previous aCO2 levels subtracted from the next month’s aCO2 levels) to the monthly snow cover observations would look like?
Well done gentlemen! You’ve just now learned to apply common knowledge to models!
Tune in next week when we learn there may be other considerations than just income when deciding to grow biofuels. No, really.
Biofuel assessment models should examine more than income
When a community decides to grow biofuels, its total income usually increases. But when it comes to non-income dimensions such as food, land and health, a considerable proportion of that community can be worse off than before. These effects of biofuel deployment need to be included in global integrated assessment models.