Extended Data Fig. 2: Modern climatology and vegetation distribution in the southern Great Plains.
From: Great Plains storm intensity since the last glacial controlled by spring surface warming
(a) Long-term (1981-2010) mean annual precipitation (MAP; mm/year). The circle indicates the location of Hall’s Cave. (b) The proportion of warm-season (March – October) precipitation relative to the annual total. Contours indicate March-October sea-level pressure, and vectors indicate March-October 850 hPa wind. (c) Monthly mean precipitation at the location of Hall’s Cave. Precipitation data is from Global Precipitation Analysis (GPCP). All other climatological data are from NCEP-NCAR Reanalysis 159. (d) Distribution of C4 vegetation across the region. Data from the International Satellite Land-Surface Climatology Project, Initiative II60. Secondary axis describes the distribution of δ13C values of terrestrial vegetation, calculated using a linear mixture model between C3 and C4 plants with endmember values of −27‰ and −9‰, respectively. Contours indicate elevation (meter).
