Climatic data and characterization of the Baja California
Peninsula
We characterized the current climatic conditions of the Baja California
peninsula by using 19 bioclimatic variables (Supporting Information)
with a spatial resolution of 1 km obtained from Worldclim (Fick &
Hijmans, 2017). Additionally, we obtained data from two different global
circulation models (CGMs): the Interdisciplinary Research on Climate
(MIROC v3.2; Hasumi & Emori, 2004) and the Community Climate System
Model (CCSM3; Collins et al., 2006), for characterizing the climate
during the Last Glacial Maximum (LGM; ~ 21 kya).
We calculated the difference between present-day and LGM conditions for
all temperature and precipitation variables for both GCMs. Since
previous work showed discrepancies between GCM conditions on the BCP
that affected SDMs (See Supporting Information for details), we compared
the GCM differences to paleoprecipitation proxy data published for
alluvial fan, pollen, lake core record, and midden data, across southern
California and the Baja peninsula to determine which GCM was more
consistent with paleoclimate data at the LGM in this region.