barometric pressure

Lake Joyce near shore water column pressure and temperature


This data set includes the deployment of an anchored pressure transducer and suspended thermistor string in Lake Joyce, Pearse Valley, as part of a NASA Astrobiology: Exobiology and Evolutionary Biology project. Instruments were deployed prior to summer melt in December 2014 near a melt water stream and retrieved in December 2015. Thermistors were positioned in the fresh water lens under the ice cover, within the water column, and on the lake bottom.

This dataset is funded through the NASA grant NNX13AI60G, with USAP event G-063. This project is not funded through the MCM LTER program. MCM LTER hosts this synergistic project.

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The instrumentation deployed in this study were moored at one site offshore from Lake Joyce stream J2 (Green et al., 1988). The pressure transducer was an InSitu Rugged TROLL 100, anchored at the sediment-water interface at 11.5 m depth. Thermistors were each RBR Ruskin Solo T loggers suspended in the water column above the anchor. The deepest was attached at the sediment-water interface with the pressure transducer (Temp 1), followed by one thermistor suspended 0.8 m above the lake bottom (Temp 2) and one thermistor suspended at 5.5 m above the lake bottom (Temp 3). The lake bottom and 0.8 m suspended thermistors were both within the same stratified lake layer, whereas the 5.5 m suspended thermistor was in the freshwater lens immediately below the underside of the ice cover. These deployment locations were chosen to identify where inflowing melt water injected across the stratified lake structure.

Following deployment, the pressure transducer readings were checked for drift by suspension on a fiberglass tape reel. Pressure transducer readings had a depth-dependent offset from pre-deployment with depth correction of 1.0448*[transducer depth(m)]-0.0884m, with assumed water specific gravity of 0.999. This correction has not been applied to the raw data set. Thermistors were checked for drift by suspension in ice water and did not show any evidence for instrumental drift.

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