[Sensor_Name: Short_Name='CONDUCTIVITY METERS']
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Changes of major ion concentrations in melting snow and terrestrial waters from northern Victoria Land, Antarctica. Entry ID: Ion_concentr_Victoria_Land |
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Summary
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Abstract:
Concentrations of major ions (Cl-, NO3-, SO42-, Na+, K+,Mg2+, Ca2+) where measure in melting snow and water samples from stream and lakes in ice-free areas throughout northern Victoria Land. Most ions in snow and terrestrial water are derived from the marine environment and their concentrations are extremely variable in species and time, especially in water systems without melting snow and ice. The distance from the sea, snow sublimation, changes in water inflow, evaporative concentrations, weathering and drainage processes in catchment, nesting seabirds and aquatic microbiota are among factors which most influence ion composition variability. Comparison with data from twelve years ago in the same lakes indicates that the warming trend detected in Terra Nova Bay station during this period did not affect the biogeochemistry of water systems. Water from a lake which recently experienced a lowering of the water level showed a remarkable increase in SO42- concentrations. We hypothesized that the differential mobility of sulphate salts in the Antarctic soils, the biosynthesis of sulphur compounds in the lake, and the progressive decrease of the water volume are factors involved in the increase of SO42- concentrations. |
| N: -72.6 | S: -74.9167 | E: 169.35 | W: 162.5 |
| Max Altitude: 400 M | Min Depth: 400 M |
Temporal Coverage
| Start Date: 2002-01-01 |
| Stop Date: 2002-02-28 |
Location Keywords
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CONTINENT
> ANTARCTICA
> VICTORIA LAND
CONTINENT > ANTARCTICA > TERRA NOVA BAY GEOGRAPHIC REGION > POLAR |
Science Keywords
| CRYOSPHERE >SNOW/ICE >SNOW MELT [Definition] |
| TERRESTRIAL HYDROSPHERE >SNOW/ICE >SNOW MELT [Definition] |
| TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >CONDUCTIVITY [Definition] |
| TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >WATER TEMPERATURE [Definition] |
| OCEANS >OCEAN TEMPERATURE >WATER TEMPERATURE [Definition] |
| OCEANS >SALINITY/DENSITY >CONDUCTIVITY [Definition] |
| OCEANS >SEA ICE >SNOW MELT [Definition] |
| TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >WATER ION CONCENTRATION [Definition] |
| BIOSPHERE >ECOLOGICAL DYNAMICS >ECOSYSTEM FUNCTIONS >NUTRIENT CYCLING [Definition] |
ISO Topic Category
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BIOTA
ENVIRONMENT |
Instrument
| CONDUCTIVITY METERS [Information] |
| ION CHROMATOGRAPHS [Information] |
| PH METERS [Information] |
| THERMOMETERS [Information] |
| WATER BOTTLES |
Quality
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Sample of melting snowbanks, stream and lake waters were collected in January and February 2002 from ice-free areas of northern Victoria Land. Temperature, pH and conductivity were measured on the site using portable meters. Bottles were brought back to the laboratory of Terra Nova Bay and stored at 20 degrees C for transport to Italy. In the Siena University laboratories samples were melted and immediately analyzed. Analysis of Major cations (Ca2+, Mg2+, Na+, K+ and NH4+) and anions (Cl-, NO3- and SO42-) was carried out by ion chromatography (IC) using a Dionex DX-120 ion chromatograph. |
Use Constraints
| none |
Keywords
| (Sector 1) Terra Victoria |
| (Sector 1) Terra Nova Bay |
| (Sector 1) Antarctica |
| Water |
Data Set Progress
| COMPLETE |
Originating Center
Data Center
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Dipartimento di Science Ambientali (G. Sarfatti), Universita Delgi Studi di Siena, Italy
[Information]
Data Center URL: http://www.unisi.it/ricerca/dip/dba/
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Distribution
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Distribution_Media:
Scientific Publications
Fees: none |
Creation and Review Dates
DIF Creation Date:
2004-09-21
Last DIF Revision Date:
2005-06-27
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