CJCZO -- Precipitation Chemistry -- Santa Catalina Mountains -- (2006-2019)

Precipitation samples were collected at 3 locations within each field site ( B2 Desert, Marshall Gulch and Oracle Ridge) on a weekly to twice weekly basis depending on precipitation events. Additionally an ISCO was installed in Marshall Gulch to collect daily snowmelt samples for stable water isotopes. Precipitation 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 samples were analyzed for carbon stable isotopes of dissolved inorganic carbon (by IRMS). pH and conductivity on precipitation samples was measured in the laboratory.

在每个研究现场（B2沙漠、Marshall Gulch和Oracle Ridge）的三个位置，根据降水事件以每周一次至每周两次的频率收集了降水样本。此外，在Marshall Gulch安装了ISCO设备，以收集每日积雪融水样本，用于稳定水同位素分析。降水样本在亚利桑那大学PI实验室进行分析，包括阴离子（通过离子色谱法）、阳离子（通过电感耦合等离子体质谱法和电感耦合等离子体原子发射光谱法）、溶解性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（在洛斯加托斯腔环向光谱仪上进行）以及营养素（氨氮和正磷酸盐在离散分析仪上进行）。部分样本进行了溶解无机碳的碳稳定同位素分析（通过同位素质谱法）。降水样本的pH值和电导率在实验室进行测量。