Lake Locations and Measurement Sites

Limno run codes, dates, and locations associated with vertical lake profile data collected in the McMurdo Dry Valleys, Antarctica (1991-2023, ongoing)


This data package provides a summary of "limno runs" performed each season in lakes located throughout the McMurdo Dry Valleys of Antarctica as part of the McMurdo Dry Valleys Long Term Ecological Research program. Each limno run is identified by unique code that allows one to compile a complete set of limnological data from a particular lake and location at specific time points. There are usually two or three limno runs performed per lake per austral summer field season, although the number of runs may vary by lake and by season depending on site access, site conditions, and other external factors.

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Two 10-cm-diameter sampling holes are drilled through the ice by auger at the deepest site of each lake and then melted out to a diameter of ~30 cm. One hole is used for 
water column PAR profiles and the primary productivity incubation; the other hole is used for discrete water sampling (Van Dorn or Niskin bottles) and CTD deployment and 
is protected with an opaque cover.
Discrete water samples are collected at specific depths relative to the water level in the borehole in each lake to capture important vertical characteristics. Appendix 6.1 in the Limnology Methods Manual lists the target depths at which samples are collected. However, due to environmental conditions (ice thickness, bottom depth in area of sample hole caused by lake level variation) the samples immediately beneath the ice and nearest to the bottom cannot always be replicated.  Consequently, the top sample is collected ~0.5m below the bottom of the ice cover, and the bottom sample as close to the bottom of the lake as possible without disturbing the sediment.  


Aug 2016 - Fixes typos in lat/lon variables reported by Amy C.Metadata enhanced in 2016 using the Drupal Ecological Information Management System (DEIMS)

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