photosynthetic active radiation

Lake Bonney Autonomous Lake Profiler and Samplers (ALPS): Dissolved CO2 Concentrations

Abstract: 

Knowledge of the McMurdo Dry Valley (MDV) lakes is limited by winter access, a period which is most relevant in understanding the habitability of other icy worlds and critical to understanding the overall function of these lakes. Owing to the lack of winter access, data that normally require human presence are incomplete. Our goal was to conduct the first year-round investigation of the biogeophysics of these unique lakes. An important part of the McMurdo Long Term Ecological Research (LTER) is evaluating carbon and nitrogen budgets in perennial ice-covered lakes. This data set addresses this core area of research and quantifies the dissolved CO 2 concentrations found at specific depths in McMurdo Dry Valley lakes.

Data set ID: 

303

Additional Project roles: 

745
746
747
748
749
750
751
752

Short name: 

ALPS_CO2

Data sources: 

ALPS_ELB_CO2_highrange
ALPS_ELB_CO2_lowrange
ALPS_WLB_CO2_lowrange
ALPS_WLB_CO2_highrange

Methods: 

Through the ice, wire-walking profilers (McLane Labs Ice Tethered Profilers [ITPs]) were deployed in both lobs of Lake Bonney. Attached to the ITPs were sensors for dissolved CO2 (Pro-Oceanus XXX). The ITPs were programmed to profile once daily around regional solar noon. A profile consisted of one downward and one upward movement to the furthest reach of the profilers possible movement, or the bottom of the lake or bottom of the ice, whichever limit came first. During the profiles, CO2 concentration was recorded every XXX seconds. Because the CO2 sensor did not contain its own pressure sensor, pressure from the CTD endcap was matched with dissolved CO2 observations based on time.

Maintenance: 

Metadata and data prepared by Luke Winslow and Inigo San Gil, Oct 2016

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