Zobrazeno 1 - 7
of 7
pro vyhledávání: '"J. M. Karhu"'
Autor:
K. Lakkala, A. Arola, J. Gröbner, S. F. León-Luis, A. Redondas, S. Kazadzis, T. Karppinen, J. M. Karhu, L. Egli, A. Heikkilä, T. Koskela, A. Serrano, J. M. Vilaplana
Publikováno v:
Atmospheric Measurement Techniques, Vol 11, Pp 5167-5180 (2018)
Non-ideal angular response of a spectroradiometer is a well-known error source of spectral UV measurements and for that reason instrument specific cosine error correction is applied. In this paper, the performance of the cosine error correction me
Externí odkaz:
https://doaj.org/article/29a4585e729a4d6db430fd3f3116a2d1
Autor:
I. Fountoulakis, A. Redondas, K. Lakkala, A. Berjon, A. F. Bais, L. Doppler, U. Feister, A. Heikkila, T. Karppinen, J. M. Karhu, T. Koskela, K. Garane, K. Fragkos, V. Savastiouk
Publikováno v:
Atmospheric Measurement Techniques, Vol 10, Pp 4491-4505 (2017)
Spectral measurements of global UV irradiance recorded by Brewer spectrophotometers can be significantly affected by instrument-specific optical and mechanical features. Thus, proper corrections are needed in order to reduce the associated uncerta
Externí odkaz:
https://doaj.org/article/75088e7525d84b59b5f2a351f18dba6d
Autor:
A. Heikkilä, J. Sakari Mäkelä, K. Lakkala, O. Meinander, J. Kaurola, T. Koskela, J. M. Karhu, T. Karppinen, E. Kyrö, G. de Leeuw
Publikováno v:
Geoscientific Instrumentation, Methods and Data Systems, Vol 5, Iss 2, Pp 531-540 (2016)
The two Brewer spectrophotometers of the Finnish Meteorological Institute at Jokioinen and Sodankylä have been operated according to the highest levels of the WMO∕GAW (World Meteorological Organization∕Global Atmosphere Watch) recommendations wi
Externí odkaz:
https://doaj.org/article/7153f8f751cc45a2984f3f83a7b4d893
Autor:
A. Heikkilä, J. Kaurola, K. Lakkala, J. M. Karhu, E. Kyrö, T. Koskela, O. Engelsen, H. Slaper, G. Seckmeyer
Publikováno v:
Geoscientific Instrumentation, Methods and Data Systems, Vol 5, Iss 2, Pp 333-345 (2016)
Databases gathering atmospheric data have great potential not only as data storages but also in serving as platforms for coherent quality assurance (QA). We report on the flagging system and QA tools designed for and implemented in the European UV Da
Externí odkaz:
https://doaj.org/article/e90248b3b61a466893109cec54f2b7b3
Autor:
K. Lakkala, H. Suokanerva, J. M. Karhu, A. Aarva, A. Poikonen, T. Karppinen, M. Ahponen, H.-R. Hannula, A. Kontu, E. Kyrö
Publikováno v:
Geoscientific Instrumentation, Methods and Data Systems, Vol 5, Iss 2, Pp 315-320 (2016)
This paper describes the laboratory facilities at the Finnish Meteorological Institute – Arctic Research Centre (FMI-ARC, http://fmiarc.fmi.fi). They comprise an optical laboratory, a facility for biological studies, and an office. A dark room has
Externí odkaz:
https://doaj.org/article/0f494c96b6c9439daeda93d7fb68e561
Publikováno v:
Geoscientific Instrumentation, Methods and Data Systems, Vol 5, Iss 1, Pp 229-239 (2016)
Brewer total ozone column measurements started in Sodankylä in May 1988, 9 months after the signing of The Montreal Protocol. The Brewer instrument has been well maintained and frequently calibrated since then to produce a high-quality ozone time se
Externí odkaz:
https://doaj.org/article/73b3f1cc848841e9930d0a1cafdec235
Autor:
J. S. Mäkelä, K. Lakkala, T. Koskela, T. Karppinen, J. M. Karhu, V. Savastiouk, H. Suokanerva, J. Kaurola, A. Arola, A. V. Lindfors, O. Meinander, G. de Leeuw, A. Heikkilä
Publikováno v:
Geoscientific Instrumentation, Methods and Data Systems, Vol 5, Iss 1, Pp 193-203 (2016)
The data flow involved in a long-term continuous solar spectral UV irradiance monitoring program is investigated and structured to provide an overall view on the multiphase process from data acquisition to the final products. The program employing Br
Externí odkaz:
https://doaj.org/article/cbdaf43b31354a33a6add1bbf8ca48a2