The area- weighted mosaic tile soil moisture for the WISM initial state over Eurasia is shown in Figure B.1. Full wilting levels for each tile were calculated using the equation for the evapotranspiration from a vegetation canopy given the leaf water potential between leaf and combined surface and root zones. We convert the leaf water potential to a soil moisture value using the parameterized leaf water potential which results in complete wilting. The leaf water potential for which ET ceases is specified for each vegetation type. We can use the relation between root zone moisture potential and root zone soil moisture to determine equivalent soil moistures required in the surface and root zones to result in total wilting (after Koster and Suarez, 1995b):

where *y*_{i}*
*is the root zone moisture
potential, *y** _{s}*
is the moisture potential of the soil at
saturation,

where *y** _{l}
*is the leaf water potential of the canopy,

where all terms but*
W _{i}*

If we substitute critical leaf water
potential parameter *y**_{2}*
for

moisture condition over the Eurasian continent as defined in section 6.1.

**Figure B.1: **The
Eurasian total wilting levels used to initialize the wilted initial
soil moisture condition ensemble members. Units are fraction of
volumetric saturation. The calculation method is discussed in the
text. The bar below the figure indicates fractional
values.