Surface Radiation Measurements at Koldewey
Since 31 July 1992 surface radiation measurements have been carried out at Koldewey in the framework of the Baseline Surface Radiation Network (BSRN) in cooperation with the Norsk Polarinstitutt . The radiation signals are taken in one minute intervals and stored as averages over 5 minutes. They include:
- global radiation (pyranometer CM11, Kipp+Zonen),
- reflected solar radiation (pyranometer CM11, Kipp+Zonen),
- diffuse sky radiation (pyranometer CM11, Kipp+Zonen),
- direct solar radiation (NIP, Eppley mounted on a sun tracker),
- OG1 (global>530nm, pyranometer CM11, Kipp+Zonen),
- RG8 (global>695nm, pyranometer CM11, Kipp+Zonen),
- UV (300-370nm, TUVR, Eppley),
- sunshine duration (Solar 111, Haenni),
- downward long-wave radiation (pyrgeometer Eppley),
- upward long-wave radiation (pyrgeometer Eppley).
The pyranometers and pyrgeometers are ventilated with slightly preheated air to minimize hoar frost problems and zero offsets during cloudless and windless conditions. The instruments were maintained continuously several times per day throughout the year. After one year of operation they are re-calibrated at the German Weather Bureau according the World Radiometric Reference (WRR).
Examples of the Annual Variation of the Surface Radiation Balance
click on thumbnails
Archiving and Retrieving Data
At AWI, the radiation measurements - averaged over 5 minutes - are archived together with the data from the mast measurements, daily upper air soundings and routine synoptic surface observations in a relational database (SYBASE). Additionally some derived quantities (Iqbal 1983) such as the solar elevation, extraterrestrial solar insolation, astronomical sunshine duration are available.
Data are available from 31 July 1992.
Please contact Siegrid Debatin or Roland Neuber for retrieving data.