Sun Photometer Data (AOD) 2017 from Ny-Ålesund, Svalbard (AWIPEV) ...

• Main Authors: Graßl, Sandra, Ritter, Christoph
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Angstrom Parameter; AOD; AWIPEV; KOL03; Ny-Ålesund; Sun photometer; Svalbard; DATE/TIME; Binary Object; Binary Object File Size; Binary Object Media Type; Research station; Sun photometer, SP1a Dr. Schulz & Partner GmbH; AWIPEV_based; Lambda; Ny Ålesund
• Online Access: https://dx.doi.org/10.1594/pangaea.937596; https://doi.pangaea.de/10.1594/PANGAEA.937596

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. ... : Each measurement day contains in netcdf format the following variables:Time (minutes after midnight UTC)wavelengths (nm lambda)AODModified Angstrom parameters (3 values!)traditional Angstrom parameters (2 values) ...