Mass gain occurs almost entirely by snowfall, although
in a few areas rainfall on the snow can add a small fraction to the mass input.
Not exact matches
My guess on why was shown at RC a
few weeks ago
in comment # 12... Wayne, if it's true as you indicated
in 9, that upper air temperatures are increasing at a much stronger rate than near the surface, it seems to me the departure would explain at least part of what seems to be a large increase
in world
area having minimal
rainfall and drought... at: http://www.realclimate.org/index.php/archives/2006/07/peter-doran-and-how-misleading-talking-points-propagate/
(Nitrogen is a big problem
in native plant
areas because it's one of the limiting nutrients, and when it's supplied whether by fertilizer or grazing animals or
rainfall, that tips the balance toward European and Asian annual grasses that are very shallow - rooted — they steal every drop of rain that falls, and then burn by midsummer when the N. American native perennials are just setting seed; after a
few years the deep - rooted perennials are gone; after a
few more years so is the topsoil).
Answers for the human species often involve the global warming problem, as the water evaporates, but this can create more
rainfall in a
few areas.
I am one of the
few working
in the
area of
rainfall patterns over different parts of the globe.