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).

每周及雨季期间每两周，从每个实验场地内的3个位置采集流水抓取样本；包括马歇尔溪谷（G OUT，S OUT，WEIR，S SEEP和MRG3），奥里奇岭（ORLOW，ORMID，ORUP），以及B2沙漠（B2D-GIN，B2D-GOUT，B2D-CDO，B2D WEIR）。马歇尔溪谷的样本追溯至2006年，而奥里奇岭和B2沙漠的样本追溯至2010年。在马歇尔溪谷和奥里奇岭的出口处测量了流量，并利用盐稀释法开发了相关的水位曲线。从2012年开始，在野外测量了水温、pH值和溶解氧，在此之前，pH值和电导率均在实验室测量。水样在亚利桑那大学的PI实验室进行分析，分析项目包括阴离子（通过离子色谱法）、阳离子（通过ICPOES和ICPMS）、溶解的有机和无机碳以及总氮（通过酸化和燃烧在岛津DOC/TN分析仪上进行）、稳定水同位素（在洛斯加托斯腔体环向光谱仪上进行），以及营养素（NH4-N和正磷酸盐在离散分析仪上进行）。选定的水样进行了溶解无机碳的碳稳定同位素分析（通过质谱仪）。