Table 1

Climate and hydrologic variables for modified Jepson ecoregions in California
North- western CA Cascade ranges Modoc plateau Central western CA Great Valley Sierra Nevada East of Sierra Nevada South- western CA Mojave Desert Sonoran Desert
Precipitation (mm) Mean 1,467 1,120 435 593 341 955 309 466 155 114
Change −33.4 9.5 −1.7 28.2 24.5 15.6 23.4 2.5 13.6 12.9
% Change −2% 1% 0% 5% 8% 2% 8% 1% 10% 13%
Minimum air temperature (°C) Mean 6.0 3.2 0.4 7.9 9.7 3.8 1.0 9.0 10.5 14.8
Change 0.4 0.3 0.5 0.6 0.7 0.9 0.9 0.9 0.7 1.0
Maximum air temperature (°C) Mean 18.9 17.1 15.4 21.9 24.4 17.3 16.7 22.9 25.4 30.0
Change 0.2 0.3 0.1 0.3 0.3 0.3 0.3 0.4 0.4 0.3
Potential evapotranspiration (mm) Mean 1,042 1,055 1,018 1,279 1,365 1,179 1,194 1,381 1,470 1,523
Change 10.4 9.2 13.7 21.9 20.3 23.7 30.1 35.6 27.0 26.5
% Change 1% 1% 1% 2% 2% 2% 3% 3% 2% 2%
Recharge (mm) Mean 504 174 42 103 40 219 49 59 4 1
Change −24.2 −1.9 −1.0 4.0 4.5 0.4 5.9 −3.0 0.9 0.3
% Change −5% −1% −2% 4% 13% 0% 14% −5% 26% 35%
Runoff (mm) Mean 492 507 87 120 11 319 61 80 3 5
Change −22.3 7.3 2.4 11.9 2.5 7.3 8.8 −2.6 0.5 0.7
% Change −4% 1% 3% 11% 30% 2% 17% −3% 25% 17%
Climatic water deficit (mm) Mean 558 535 575 863 1,065 638 778 1,011 1,293 1,339
Change 1.2 9.3 25.0 9.9 2.0 24.8 36.0 30.7 20.4 13.5
% Change 0% 2% 5% 1% 0% 4% 5% 3% 2% 1%
Snow water equivalent (mm) Mean 85 227 91 1 0 241 102 12 0 0
Change −33.0 −34.0 −16.0 0.0 0.0 −27.0 8.0 −2.0 0.0 0.0
% Change 39% 15% 18% 0% 0% 11% −8% 17% 0% 0%

Mean value for 1981–2010 and change from 1951–1980.

Flint et al.

Flint et al. Ecological Processes 2013 2:25   doi:10.1186/2192-1709-2-25

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