CJCZO -- Stream Water Chemistry -- Santa Catalina Mountains -- (2006-2019)

Stream water grab samples were collected weekly and twice weekly during monsoon season from 3 locations within each field site; Marshall Gulch (G OUT, S OUT, WEIR, S SEEP and MRG3), Oracle Ridge (ORLOW, ORMID, ORUP), and B2 Desert (B2D-GIN, B2D-GOUT, B2D-CDO, B2D WEIR). Marshall Gulch samples date back to 2006 while Oracle Ridge and B2 Desert sites samples date back to 2010. Discharge was measured at the outlets of the Marshall Gulch and Oracle Ridge sites where rating curves were developed using the salt dilution method. Temperature, pH, and dissolved oxygen were measured in the field starting in 2012 and prior to that pH and EC were measured in the laboratory. Water samples were analyzed in PI laboratories at the University of Arizona for anions (by IC), cations (by ICPOES and ICPMS), dissolved organic and inorganic carbon and total nitrogen (by acidification and combustion on a Schimadzu DOC/TN Analyzer), stable water isotopes (on a Los Gatos Cavity Ring Down Spectrometer), and nutrients (NH4-N and Orthophosphate on a Discrete Analyzer). Selected water samples were analyzed for carbon stable isotopes of dissolved inorganic carbon (by IRMS).