Open AccessAll-sky camera system providing high temporal resolution annual time series of irradiance in the Arctic
Author(s) -
Geir Johnsen,
Artur Zolich,
Stephen Grant,
Rune Bjorgum,
Jonathan H. Cohen,
David McKee,
Tomasz Kopec,
Daniel Vogedes,
Jørgen Berge
Publication year - 2021
Publication title -
applied optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 197
eISSN - 2155-3165
pISSN - 1559-128X
DOI - 10.1364/ao.424871
Subject(s) - irradiance , arctic , observatory , sky , remote sensing , meteorology , geology , physics , optics , astronomy , oceanography
The ArcLight observatory provides hourly continuous time series of light regime data (intensity, spectral composition, and photoperiod) from the Arctic, Svalbard at 79° N. Until now, no complete annual time series of biologically relevant light has been provided from the high Arctic due to insufficient sensitivity of commercial light sensors during the Polar Night. We describe a camera system providing all-sky images and the corresponding integrated spectral irradiance ( E P A R ) in energy or quanta units, throughout a complete annual cycle. We present hourly-diel-annual dynamics from 2017 to 2020 of irradiance and its relation to weather conditions, sun and moon trajectories.