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

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...

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Bibliographic Details
Main Authors: Graßl, Sandra, Ritter, Christoph
Format: Dataset
Language:English
Published: PANGAEA 2021
Subjects:
Angstrom Parameter
AOD
Arctic
Arctic aerosol
AWIPEV
AWIPEV_based
KOL03
Koldewey
Ny-Ålesund
remote sensing
Research station
RS
Spitsbergen
Svalbard
Sun photometer
Ny Ålesund
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.937554
https://doi.org/10.1594/PANGAEA.937554
Description
Summary: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.

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