Abstract:
As part of the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, PAR is measured at one depth during primary production experiments in Dry Valley Lakes. This data set quantifies instantaneous underwater PAR at 10-meter depths in Lakes Bonney and Hoare, and at 7-meter depth in Lake Fryxell (depths vary after 2008, check data file for actual depth). Ambient PAR was also measured at the air-ice interface from each of these lakes.
Methods:
A Licor LI-193SA spherical quantum sensor and a LI-190SA flat sensor are attached to a Licor LI-1000 data logger to record underwater PAR and ambient PAR.
Underwater PAR data are recorded in the sampling hole covered by the Weatherport, whereas ambient PAR is measured approximately 10 m away from the Weatherport. The Licor LI-1000 queries ambient and underwater PAR at 5 second intervals an records mean PAR data (micromol photons m-2 s-1) every 10 minutes.
We began using a LI-1400 at the start of the 1213 season. The Licor LI-1400 queries ambient and underwater PAR at 5 second intervals and records mean PAR data (micromol photons m-2 s-1) every 5 minutes.
We began using a LI-1400 at the start of the 1213 season. The Licor LI-1400 queries ambient and underwater PAR at 5 second intervals and records mean PAR data (micromol photons m-2 s-1) every 5 minutes.