 |
| Titel |
A method for merging nadir-sounding climate records, with an application to the global-mean stratospheric temperature data sets from SSU and AMSU |
| VerfasserIn |
C. McLandress, T. G. Shepherd, A. I. Jonsson, T. von Clarmann, B. Funke |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 16 ; Nr. 15, no. 16 (2015-08-20), S.9271-9284 |
| Datensatznummer |
250119980
|
| Publikation (Nr.) |
 copernicus.org/acp-15-9271-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| A method is proposed for merging different nadir-sounding climate data
records using measurements from high-resolution limb sounders to provide a
transfer function between the different nadir measurements. The two
nadir-sounding records need not be overlapping so long as the limb-sounding
record bridges between them. The method is applied to global-mean
stratospheric temperatures from the NOAA Climate Data Records based on the
Stratospheric Sounding Unit (SSU) and the Advanced Microwave Sounding Unit-A
(AMSU), extending the SSU record forward in time to yield a continuous data
set from 1979 to present, and providing a simple framework for extending the
SSU record into the future using AMSU. SSU and AMSU are bridged using
temperature measurements from the Michelson Interferometer for Passive
Atmospheric Sounding (MIPAS), which is of high enough vertical resolution to
accurately represent the weighting functions of both SSU and AMSU. For this
application, a purely statistical approach is not viable since the different
nadir channels are not sufficiently linearly independent, statistically
speaking. The near-global-mean linear temperature trends for extended SSU
for 1980–2012 are −0.63 ± 0.13, −0.71 ± 0.15 and
−0.80 ± 0.17 K decade−1 (95 % confidence) for channels 1, 2 and 3,
respectively. The extended SSU temperature changes are in good agreement
with those from the Microwave Limb Sounder (MLS) on the Aura satellite, with
both exhibiting a cooling trend of ~ 0.6 ± 0.3 K decade−1
in the upper stratosphere from 2004 to 2012. The extended SSU
record is found to be in agreement with high-top coupled atmosphere–ocean
models over the 1980–2012 period, including the continued cooling over the
first decade of the 21st century. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|