 |
| Titel |
Characterisation of J(O1D) at Cape Grim 2000–2005 |
| VerfasserIn |
S. R. Wilson |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 13 ; Nr. 15, no. 13 (2015-07-08), S.7337-7349 |
| Datensatznummer |
250119874
|
| Publikation (Nr.) |
 copernicus.org/acp-15-7337-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| Estimates of the rate of production of excited oxygen atoms due to the
photolysis of ozone (J(O1D)) have been derived from radiation
measurements carried out at Cape Grim, Tasmania (40.6° S,
144.7° E). The individual measurements have a total uncertainty of
16 % (1σ). These estimates agree well with model estimates of clear-sky
photolysis rates. Observations spanning 2000–2005 have been used to
quantify the impact of season, clouds and ozone column amount. The annual
cycle of J(O1D) has been investigated via monthly means. These means
show an interannual variation (monthly standard deviation) of 9 %, but
in midsummer and midwinter this reduces to 3–5 %. Variations in solar
zenith angle and total column ozone explain 86 % of the observed
variability in the measured photolysis rates. The impact of total column
ozone, expressed as a radiation amplification factor (RAF), is found to be
~ 1.53, in agreement with model estimates. This ozone dependence
explains 20 % of the variation observed at medium solar zenith angles
(30–50°). The impact of clouds results in a median reduction of
30 % in J(O1D) for the same solar zenith angle range. Including
estimates of cloudiness derived from long-wave radiation measurements
resulted in a statistically significant fit to observations, but the quality
of the fit did not increase significantly as measured by the adjusted R2. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|