Graßl, Sandra; Ritter, Christoph (2021): Sun Photometer Data (AOD) 2017 from Ny-Ålesund, Svalbard (AWIPEV) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.937596, In: Graßl, S; Ritter, C (2021): Sun Photometer Data (AOD) from Ny-Ålesund, Svalbard (AWIPEV) [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.937554
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Abstract:
Aerosol optical depth (AOD) is measured by a sun photometer, type SP1a by Dr. Schulz & Partner GmbH in 17 wavelengths between λ = 369nm to 1023nm with a field of view of 1° × 1° and a time resolution of 1 minute. In winter 2012/13 a new sun photometer was installed and just 10 of 17 wavelengths remained in the same wavelength range. With the nine out of ten wavelengths optical parameters like the AOD are computed. The one, which is devoted to water vapor is omitted. The instrument is calibrated regularly in pristine conditions at Izaña, Tenerife, via Langley method. A cloud screening based on short scale fluctuations of the AOD is used. The uncertainty for the AOD is generally said to be around 0.01. However, this is the maximum error of the instrument because the fluctuations are much smaller by comparing data minute by minute under low or constant aerosol conditions.
The number of individual measurements differs between a few hundreds, especially in March and September, to up to 12,000 in early summer. No trend in each month can be seen comparing the amount of cloud-free measurements over the years. Only an annual cycle due to polar day and night is included in the data. Due to the instrument data is only available in clear sky conditions. In this regard the data should represent the real aerosol conditions. Only aerosols that are advected and processed within clouds or hygroscopic growth cannot be measured by this instrument.
In this data set AOD, Angstrom-Exponent and modified Angstrom-Exponent (Graßl, Ritter 2019, Remote Sensing, https://doi.org/10.3390/rs11111362) are given for the sun photometer at AWIPEV for the time 18. March 2017 until 30. September 2017. The variables are in netcdf format for each measurement day. The used instrument for the measurement period was SP1A31.
Related to:
Graßl, Sandra (2019): Properties of Arctic Aerosols based on Photometer Long-Term Measurements in Ny-Ålesund (Master thesis). hdl:10013/epic.6594e5f6-6041-4a2b-b730-361720c0d722
Graßl, Sandra; Ritter, Christoph (2019): Properties of Arctic Aerosol Based on Sun Photometer Long-Term Measurements in Ny-Ålesund, Svalbard. Remote Sensing, 11(11), 1362, https://doi.org/10.3390/rs11111362
Source:
Graßl, Sandra; Ritter, Christoph (2022): Sun Photometer Data (RAW) 2017 from Ny-Ålesund, Svalbard (AWIPEV) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.940014
Coverage:
Latitude: 78.920000 * Longitude: 11.930000
Date/Time Start: 2017-03-18T00:00:00 * Date/Time End: 2017-09-30T00:00:00
Minimum Elevation: 11.0 m * Maximum Elevation: 11.0 m
Event(s):
AWIPEV (Koldewey) * Latitude: 78.920000 * Longitude: 11.930000 * Elevation: 11.0 m * Location: Spitsbergen, Svalbard * Campaign: AWIPEV_based * Basis: AWIPEV * Method/Device: Research station (RS)
Comment:
Each measurement day contains in netcdf format the following variables:
Time (minutes after midnight UTC)
wavelengths (nm lambda)
AOD
Modified Angstrom parameters (3 values!)
traditional Angstrom parameters (2 values)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Graßl, Sandra | Geocode | ||
| 2 | Binary Object | Binary | Graßl, Sandra | Sun photometer, SP1a (Dr. Schulz & Partner GmbH) | ||
| 3 | Binary Object (File Size) | Binary (Size) | Bytes | Graßl, Sandra | Sun photometer, SP1a (Dr. Schulz & Partner GmbH) | |
| 4 | Binary Object (Media Type) | Binary (Type) | Graßl, Sandra | Sun photometer, SP1a (Dr. Schulz & Partner GmbH) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB)
Size:
197 data points