High frequency measurements from Lake Vida Meteorological Station (VIAM), McMurdo Dry Valleys, Antarctica (1995-2022, ongoing)

Summary

Abstract:

As part of the McMurdo Dry Valleys Long Term Ecological Research program, meteorological data are collected from various locations throughout the McMurdo Dry Valleys of Antarctica. This data package contains 15-minute data from the Lake Vida Meteorological Station (VIAM), located in Victoria Valley.

Date Range:

November 24, 1995 to December 14, 2022

Data Citation

Doran, P.T., Fountain, A.G. 2023. High frequency measurements from Lake Vida Meteorological Station (VIAM), McMurdo Dry Valleys, Antarctica (1995-2022, ongoing). Environmental Data Initiative. DOI: 10.6073/pasta/550ff8cd5de3983de8b704a872426162. Dataset accessed 29 April 2024.

Dataset(s)

Description:

VIAM - Air Temperature

Variables (click to expand):

DATASET_CODE

Label:
Definition: Code for given set of information for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

METLOCID

Label:
Definition: Location code for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

DATE_TIME

Label:
Definition: Date/time of sample (New Zealand DST, +13 UTC)
Type: Date/time
Date format: MM/DD/YYYY HH24:MI
Missing values: None specified

AIRT3M

Label:
Definition: Average air temperature at 3 m above ground
Type: Physical quantity
Unit: celsius
Maximum: Not specified
Minimum: Not specified
Precision: 0.01
Missing values:
- Null = None given

AIRT_COMMENTS

Label: air temperature comments
Definition: Noted comments by the investigator about the particular measure of air temperature
Type: Nominal
Missing values: None specified

File:

mcmlter-clim-viam_airt-15min-20230706.csv (31.72 MB)

Description:

VIAM - Solar Radiation

Variables (click to expand):

DATASET_CODE

Label:
Definition: Code for given set of information for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

METLOCID

Label:
Definition: Location code for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

DATE_TIME

Label:
Definition: Date/time of sample (New Zealand DST, +13 UTC)
Type: Date/time
Date format: MM/DD/YYYY HH24:MI
Missing values: None specified

PAR

Label:
Definition: Photosynthetically active radiation
Type: Physical quantity
Unit: micromols/second/meter2
Maximum: Not specified
Minimum: Not specified
Precision: 0.1
Missing values:
- Null = None given

SWRADIN

Label:
Definition: Incoming shortwave radiation/solar flux
Type: Physical quantity
Unit: W/m2
Maximum: 900
Minimum: 0
Precision: 0.1
Missing values:
- Null = None given

SWRADOUT

Label:
Definition: Outgoing shortwave radiation/solar flux
Type: Physical quantity
Unit: W/m2
Maximum: 900
Minimum: 0
Precision: 0.1
Missing values:
- Null = None given

RADN_COMMENTS

Label: radiation comments
Definition: Noted comments by the investigator about the particular measure of radiation
Type: Nominal
Missing values: None specified

File:

mcmlter-clim-viam_radn-15min-20230706.csv (51.86 MB)

Description:

VIAM - Relative Humidity

Variables (click to expand):

DATASET_CODE

Label:
Definition: Code for given set of information for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

METLOCID

Label:
Definition: Location code for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

DATE_TIME

Label:
Definition: Date/time of sample (New Zealand DST, +13 UTC)
Type: Date/time
Date format: MM/DD/YYYY HH24:MI
Missing values: None specified

Label:
Definition: Relative humidity at 3 meters
Type: Physical quantity
Unit: percent
Maximum: Not specified
Minimum: Not specified
Precision: 0.01
Missing values:
- Null = None given

RH_COMMENTS

Label: relative humidity comments
Definition: Noted comments by the investigator about the particular measure of relative humidity
Type: Nominal
Missing values: None specified

File:

mcmlter-clim-viam_rh-15min-20220516.csv (28.38 MB)

Description:

VIAM - Soil Temperature

Variables (click to expand):

DATASET_CODE

Label:
Definition: Code for given set of information for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

METLOCID

Label:
Definition: Location code for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

DATE_TIME

Label:
Definition: Date/time of sample (New Zealand DST, +13 UTC)
Type: Date/time
Date format: MM/DD/YYYY HH24:MI
Missing values: None specified

SOILT0CM

Label:
Definition: Soil temperature at 0 cm depth
Type: Physical quantity
Unit: celsius
Maximum: Not specified
Minimum: Not specified
Precision: 0.01
Missing values:
- Null = None given

SOILT5CM

Label:
Definition: Soil temperature at 5 cm depth
Type: Physical quantity
Unit: celsius
Maximum: Not specified
Minimum: Not specified
Precision: 0.01
Missing values:
- Null = None given

SOILT10CM

Label:
Definition: Soil temperature at 10 cm depth
Type: Physical quantity
Unit: celsius
Maximum: Not specified
Minimum: Not specified
Precision: 0.01
Missing values:
- Null = None given

SOILT_COMMENTS

Label:
Definition: Noted comments by the investigator about the particular measure of SOILT
Type: Nominal
Missing values: None specified

File:

mcmlter-clim-viam_soilt-15min-20230706.csv (43.4 MB)

Description:

VIAM - Surface Change

Variables (click to expand):

DATASET_CODE

Label:
Definition: Code for given set of information for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

METLOCID

Label:
Definition: Location code for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

DATE_TIME

Label:
Definition: Date/time of sample (New Zealand DST, +13 UTC)
Type: Date/time
Date format: MM/DD/YYYY HH24:MI
Missing values: None specified

SURF_CHANGE

Label:
Definition: Surface Height Change - snowfall / sediment accumulation or loss
Type: Physical quantity
Unit: centimeter
Maximum: Not specified
Minimum: Not specified
Precision: 0.4
Missing values:
- Null = None given

SURFCHANGE_COMMENTS

Label: surface change comments
Definition: Noted comments by the investigator about the particular measure of surface change
Type: Nominal
Missing values: None specified

File:

mcmlter-clim-viam_surfchange-15min-20230706.csv (26.23 MB)

Description:

VIAM - Wind Direction and Speed

Variables (click to expand):

DATASET_CODE

Label:
Definition: Code for given set of information for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

METLOCID

Label:
Definition: Location code for Lake Vida meteorology station
Type: Nominal
Missing values: None specified

DATE_TIME

Label:
Definition: Date/time of sample (New Zealand DST, +13 UTC)
Type: Date/time
Date format: MM/DD/YYYY HH24:MI
Missing values: None specified

WDIR

Label:
Definition: Average wind direction
Type: Physical quantity
Unit: degreesfromnorth
Maximum: Not specified
Minimum: Not specified
Precision: 0.1
Missing values:
- Null = None given

WDIRSTD

Label:
Definition: Standard deviation of wind direction
Type: Physical quantity
Unit: degreesfromnorth
Maximum: Not specified
Minimum: Not specified
Precision: 0.1
Missing values:
- Null = None given

WSPD

Label:
Definition: Wind speed
Type: Physical quantity
Unit: metersPerSecond
Maximum: Not specified
Minimum: Not specified
Precision: 0.1
Missing values:
- Null = None given

WSPDMAX

Label:
Definition: Maximum wind speed
Type: Physical quantity
Unit: metersPerSecond
Maximum: Not specified
Minimum: Not specified
Precision: 0.1
Missing values:
- Null = None given

WSPDMIN

Label:
Definition: Minimum wind speed
Type: Physical quantity
Unit: metersPerSecond
Maximum: Not specified
Minimum: Not specified
Precision: 0.1
Missing values:
- Null = None given

WIND_COMMENTS

Label:
Definition: Noted comments by the investigator about the particular measure of WIND
Type: Nominal
Missing values: None specified

File:

mcmlter-clim-viam_wind-15min-20230706.csv (46.58 MB)

Short name:

VIAM

Dataset ID:

7016

People

Principal Investigator(s):

Peter T. Doran

Andrew G. Fountain

Contact:

McMurdo Dry Valleys LTER Information Manager

Associated Personnel:

Field Technician

Data Manager

Former Field Crew

Former Data Manager

Methodology

Purpose:

Meteorological data are collected year-round at each of MCM LTER stations. Data are manually downloaded from the meteorological stations during the austral summer. Raw 15 minute data (Level 0) is processed and provided as Level 1 data on the MCM LTER website. Field notes, sensor information, processing procedures, QA/QC, and metadata is provided in the Meteorological Post Processing Documentation and Task Lists for each field season at the following address:https://mcm.lternet.edu/meteorological-task-lists

Methods:

The Lake Vida meteorological station was added to the McMurdo Dry Valley network in the 1995-1996 field season. It was established on the shore of Lake Vida in Victoria Valley, one of the largest lakes in the dry valleys, recently discovered to have a 19 m ice cover over a hypersaline brine of undetermined depth. The station was set up to sample sensors every 30 seconds and send summary statistics (for example, averages and maximums) to solid-state storage modules every 15 minutes. This has resulted in approximately 20 values being recorded for final storage in every output interval.

Sampling and Averaging Intervals For Sampling frequency and Data Logger output and averaging intervals please visit: http://mcmlter.lternet.edu/data/meteorology/methods/Interval_Dates.pdf

Seasonal Task Summary To view the data post-processing steps for each season please visit: https://mcm.lternet.edu/meteorological-task-lists

Maintenance:

On September 6, 1999, the data manager added the 1998-1999 data to this dataset. In the process,she did some fine-tuning of the data, which included:

1. Addition of PAR values between Nov 24, 1997 @ 11:30 and Jan 13, 1998 @ 12:00. Thiswas done at the request of Thomas Nylen.

On June 1, 2000, the 1999-2000 data was posted. In the process, Denise Steigerwald changed thelayout of the files so that they were sorted by category (ait temperatures, humidity, radiation,wind etc.) rather than by year. Files containing monthly and daily averages were generated andminor adjustments were made to the metadata.

On June 1, 2000, relative humidity (RH) values were corrected for a systematic error in the measurement created by an instrument manufacturer error. All RH data with air temperatures below freezing were corrected using the vapor pressure over ice (rather than over water whichwas used initially). The error became quite large for very cold temperatures (the correction couldgrow to around 30%). The formula used for the correction was:

RH_corr=RH_orig/((A*temp*temp)+(B*temp)+C) where

RH_corr = corrected relative humidity

RH_orig = original relative humidity

temp = air temperature

A = 4.165E-5

B = 9.7E-3

C = 1.0

For example, with an air temperature of -2.3 and RH_orig of 50.6, the RH_corr will be 51.7.Records that showed corrected RH values greater than or equal to 100 were changed to 99.99and flagged.

In June 2000, summary files were added to the web containing daily and monthly statistics.These were generated by creating "views" of daily and monthly means, minimums, maximumsand counts of the records represented in the Oracle database's meteorology tables.

2022-03-01: Data from the 13-14 season (2012-12-28 10:45 through 2014-01-02 22:15) was replaced due to missing wind speed data and related errors noted by Doran.

July 2023: The RH sensor at this station was upgraded in January 2022. However, the measurements recorded by this new sensor are suspect. Consequently, no RH data have been released after 1/19/2022 10:45 while this issue is being investigated further.

Research Section:

LTER Core Areas:

disturbance

MCM Keywords:

Keywords:

Metadata Download

Abstract:

Date Range:

Description:

Variables (click to expand):

File:

Description:

Variables (click to expand):

File:

Description:

Variables (click to expand):

File:

Description:

Variables (click to expand):

File:

Description:

Variables (click to expand):

File:

Description:

Variables (click to expand):

File:

Short name:

Dataset ID:

Principal Investigator(s):

Contact:

Associated Personnel:

Related publications:

Related links:

Purpose:

Methods:

Maintenance:

Research Section:

LTER Core Areas:

MCM Keywords:

Keywords: