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1. Lake Mendota Microbial Observatory Temperature, Dissolved Oxygen, pH, and conductivity data, 2006-present.

   https://doi.org/10.6073/pasta/9aededa7f406e2c204dc3f8249f53b9d  

   Rohwer, Robin R; McMahon, Katherine D (January 2022, Environmental Data Initiative)

   {"Abstract":["The Lake Mendota Microbial Observatory collects routine water physical and chemical\n measurements alongside their microbial samples. This dataset includes measurements of water\n temperature, dissolved oxygen, pH, and conductivity collected at the central Deep Hole,\n collocated with a weather buoy (43°05'58.2"N 89°24'16.2"W). All measurements were collected\n with handheld probes. Data from 2006-2014 was compiled from multiple sources and includes only\n water temperature and dissolved oxygen. Data from 2014-2019 is from the same probe, a YSI Pro\n Plus instrument, and also includes pH and specific conductance. Routine microbial observatory\n sampling continues into the present."]} 

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2. Lake Mendota Microbial Observatory Secchi Disk Measurements 2012-present

   https://doi.org/10.6073/PASTA/3B650E19D28CBC7B9ED631F0A7878033  

   Rohwer, Robin R; McMahon, Katherine D (January 2022, Environmental Data Initiative)

   The Lake Mendota Microbial Observatory collects routine water clarity measurements alongside their microbial samples. This dataset includes measurements of water clarity collected at the central Deep Hole, collocated with a weather buoy (43°05'58.2"N 89°24'16.2"W). All measurements were collected with handheld Secchi discs. When multiple personnel performed the Secchi disc measurements, the average and standard deviation are reported. To take the Secchi depth, sunglasses are removed and the disc is lowered on the shaded side of the boat. The Secchi depth is the average between where the Secchi disc disappears while lowering it and where it reappears while raising it. Routine microbial observatory sampling continues into the present. 

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3. Lake Mendota Microbial Observatory Secchi Disk Measurements 2012-present

   https://doi.org/10.6073/pasta/d5d90acbe0562c37058c2973cdba89f7  

   Rohwer, Robin R; McMahon, Katherine D (January 2022, Environmental Data Initiative)

   {"Abstract":["The Lake Mendota Microbial Observatory collects routine water clarity measurements\n alongside their microbial samples. This dataset includes measurements of water clarity\n collected at the central Deep Hole, collocated with a weather buoy (43°05'58.2"N\n 89°24'16.2"W). All measurements were collected with handheld Secchi discs. When multiple\n personnel performed the Secchi disc measurements, the average and standard deviation are\n reported. To take the Secchi depth, sunglasses are removed and the disc is lowered on the\n shaded side of the boat. The Secchi depth is the average between where the Secchi disc\n disappears while lowering it and where it reappears while raising it. Routine microbial\n observatory sampling continues into the present."]} 

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4. Carbonate chemistry in Mission Aransas Estuary from May 2014 to Feb 2017 and Dec 2018 to Feb 2020

   https://doi.org/10.26008/1912/bco-dmo.835227.1  

   McCutcheon, Melissa R.; Hu, Xinping (January 2021, Biological and Chemical Oceanography Data Management Office (BCO-DMO))

   The Ecosystem Science and Modeling lab has been collecting water samples from five stations in the Mission-Aransas Estuary (MAE, Northwest Gulf of Mexico, Texas coast) for carbonate system characterization on a monthly to twice monthly basis since May 2014. This dataset includes temperature, salinity, dissolved inorganic carbon (DIC), total alkalinity (TA), calcium, and pH measurements from surface and bottom water samples in MAE from May 2014 – Feb 2017 and Dec 2018 – Feb 2020. Additional data for this estuary to fill in the Feb 2017 – Dec 2018 gap are also archived with BCO-DMO (http://www.bco-dmo.org/dataset/784673, doi:10.1575/1912/bco-dmo.784673.1). 

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5. Water quality data for Green Lakes Valley, 2000 - ongoing.

   https://doi.org/10.6073/pasta/8d27d4c701bbd121f54e5db712a697d5  

   McKnight, Diane M; Yevak, Samuel; Dykema, Stephanie; Loria, Kelly; LTER, Niwot Ridge (March 2025, Environmental Data Initiative)

   This dataset contains water quality measurements made on Green Lakes 1, 2, 3, 4, 5, and Lake Albion. Green Lake 4 was initially sampled in 2000 and is ongoing. Ongoing sampling of Green Lakes 1 was started in 2014 and ongoing sampling of Lake Albion was started in 2016. Water samples were collected for analysis of chlorophyll a and nutrient analysis (which is available in glvwatsolu.dm.data) and field measurements for pH, temperature, specific conductivity, dissolved oxygen (DO), % saturation, secchi depth, PAR. Secchi depth is recorded at the 0m row however it is a measurement of depth and so the units are meters. Most samples were collected between 0800 and 1200 MST. The first sampling date each summer occurs shortly after the ice had melted. Data are collected from an inflatable raft at the point of deepest depth or from the lake inlet and outlet when surface flow is present. The majority of chlorophyll-a the measurements were taken at the surface (0m), the metalimnion (3m), and the hypolimnion nine (usually 8-11m). However, additional measurements were taken for side projects of the long-term dataset during several of the years and are included in this dataset. Water samples from the metalimnion or hypolimnion were collected using a Van Dorne sampler, and surface samples were collected as grab samples from the water column surface, the inlet and outlet. Field measurements were conducted using a YSI either DO or multiple probe meter (2014-2017, YSI MPS 556)(2018-ongoing, YSI ProPlus) and a Li-Cor meter with a quantum sensor. Chlorophyll-a was extracted from filtered samples and absorbance was measured before and after acidification to quantify chlorophyll a concentration. 

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