In 1963, the Glen Canyon Dam, in Hite Utah was completed, creating the Lake Powell reservoir along the Colorado River. The water levels of Lake Powell peaked in 1983 and have declined since, releasing over-pressure on the underlying sediment. This release in over-pressure created mud volcanoes, structures along the shoreline made of cavities that allow fluid and gases to rise to the surface and escape. Green house gases including methane are released from these structures, and to better understand how development of natural wetlands can result in unintended increased levels of greenhouse gas emissions, we asked 1) how much of each gas is generated or and whether the amount of each gas is changing through time and 2) how are these gases forming in the subsurface? We first measured the amounts of carbon dioxide (CO2), methane (CH4), and air (N) in volcano gas samples collected in 2014, 2015, and 2016. We found that from 2014 through 2016, methane levels from these volcanoes fluctuated significantly. In 2016, we looked at the amounts of carbon and hydrogen isotopes in the methane, which told us the gas is generated from microorganisms feeding on organic matter and is released during water-level fluctuations. We looked at mud volcanoes only located along the Lake Powell marina delta in Hite, Utah. The data spans geological structures restricted to one marina delta.

This dataset contains leaf functional trait measurements describing leaf structure, chemistry and metabolism collected from the Daintree Rainforest, Cape Tribulation site, in the dry season 2012 and wet season 2014.

This dataset contains leaf functional trait measurements describing leaf structure, chemistry and metabolism collected from the Alice Mulga site in 2014

This dataset contains leaf functional trait measurements describing leaf structure, chemistry and metabolism collected from the Robson Creek Rainforest site, in the dry season 2012 and wet season 2014.

This dataset contains leaf functional trait measurements describing leaf structure, chemistry and metabolism collected from the Calperum Mallee site, in 2013.

This dataset contains leaf functional trait measurements describing leaf structure, chemistry and metabolism collected from the Great Western Woodlands site in 2013.

This dataset contains leaf functional trait measurements describing leaf structure, chemistry and metabolism collected from the Warra Tall Eucalypt site, in summer 2012 and winter 2013.

This dataset contains leaf functional trait measurements describing leaf structure, chemistry and metabolism collected from the Cumberland Plain site in 2014.