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

• Main Authors: Graßl, Sandra, Ritter, Christoph
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2021
• Subjects: Angstrom Parameter; AOD; Arctic; Arctic aerosol; AWIPEV; KOL03; Ny-Ålesund; Sun photometer; Svalbard; Monitoring; Ny Ålesund
• Online Access: https://dx.doi.org/10.1594/pangaea.937676; https://doi.pangaea.de/10.1594/PANGAEA.937676

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.\nThe number of individual measurements differs between a few hundreds, especially in March and September, to up to 12,000 in early ... : Please note that, due to instrument failures there is no data for the year 2018. ...