TY  - JOUR
AU  - Bohn, B.
AU  - Kraus, A.
AU  - Müller, M.
AU  - Hofzumahaus, A.
TI  - Measurement of atmospheric O3--> O(1D) photolysis frequencies using filterradiometry
JO  - Journal of Geophysical Research
VL  - 109
SN  - 0148-0227
CY  - Washington, DC
PB  - Union
M1  - PreJuSER-40828
SP  - D10S90
PY  - 2004
N1  - Record converted from VDB: 12.11.2012
AB  - [1] In this work the instrumentation and characterization of a filterradiometer suitable for field measurements of O-3 --> O(D-1) photolysis frequencies, j((OD)-D-1), is described. A nonlinear calibration function considering ozone column and solar zenith angle is derived as well as a procedure utilizing an irradiance standard as an absolute reference. The measurement concept is tested by a field comparison with a spectroradiometer. Based solely on laboratory characterizations and simulated solar actinic flux spectra, a systematic deviation of 4% is obtained with a standard deviation of 3% at solar zenith angles below 70degrees. The standard deviation rises to 8% at solar zenith angles in the range 70degrees - 85degrees. The systematic difference is within the accuracy of the applied radiometric calibrations while the standard deviation is mainly caused by insufficient synchronization of the different measurement techniques under variable field conditions. In addition, the relative temperature dependence of j((OD)-D-1) as a function of solar zenith angle and ozone column is derived which is applicable to any ground-based j((OD)-D-1) measurement.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000221611300002
DO  - DOI:10.1029/2003JD004319
UR  - https://juser.fz-juelich.de/record/40828
ER  -