 |
| Titel |
On the decadal increase in the tropical mean outgoing longwave radiation for the period 1984-2000 |
| VerfasserIn |
D. Hatzidimitriou, I. Vardavas, K. G. Pavlakis, N. Hatzianastassiou, C. Matsoukas, E. Drakakis |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 4, no. 5 ; Nr. 4, no. 5 (2004-08-27), S.1419-1425 |
| Datensatznummer |
250001951
|
| Publikation (Nr.) |
 copernicus.org/acp-4-1419-2004.pdf |
|
|
|
|
|
| Zusammenfassung |
| In the present paper, we have calculated the outgoing longwave radiation at
the top of the atmosphere (OLR at TOA) using a deterministic radiation
transfer model, cloud data from ISCCP-D, and atmospheric temperature and
humidity data from NCEP/NCAR reanalysis, for the seventeen-year period
1984-2000. We constructed anomaly time-series of the OLR at TOA, as well as
of all of the key input climatological data, averaged in the tropical region
between 20°N and 20°S. We compared the anomaly time-series of the
model calculated OLR at TOA with that obtained from the ERBE S-10N (WFOV NF
edition 2) non-scanner measurements. The model results display very similar
seasonal and inter-annual variability as the ERBS data, and indicate a
decadal increase of OLR at TOA of 1.9±0.2Wm-2/decade, which is
lower than that displayed by the ERBS time-series (3.5±0.3Wm-2).
Analysis of the inter-annual and long-term variability of the various
parameters determining the OLR at TOA, showed that the most important
contribution to the observed trend comes from a decrease in high-level cloud
cover over the period 1984-2000, followed by an apparent drying of the upper
troposphere and a decrease in low-level cloudiness. Opposite but small
trends are introduced by a decrease in low-level cloud top pressure, an
apparent cooling of the lower stratosphere (at the 50mbar level) and a small
decadal increase in mid-level cloud cover. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|