S. G. Basha, M. V. Ratnam, D. N. Rao, and M. Fujiwara (presenting)
The proposed "S-RIP activities over Indian Region"
Reanalysis data sets contribute significantly for atmospheric
science community in many ways like for validation of instrumental
data sets, input for modeling/forecasting, long-term trends,
climate studies etc., from surface to upper atmosphere.
At present 8 reanalysis data sets available but differ in several
aspects concerning the middle atmosphere such as the strength of
the Brewer-Dobson circulation, polar vortex evolution,
temperature trends, tropical wave spectra and tidal depiction.
We propose few S-RIP activities concerning to the Indian region.
In general, the datasets which is engendering over Indian region
is not going into reanalysis data sets due to various reasons.
We have selected a few data sets over Indian region which are of
high accuracy and vertical resolutions first to compare the
various reanalysis data sets. First, we have compared the 6
reanalysis with high resolution radiosonde data over Gadanki.
Out of 6 reanalysis data sets 4 data sets are comparing well
with radiosonde measurements, among these ERA-Interim temperature
shows excellent comparisons. Further we have made inter comparison
of 6 reanalysis data sets over India region. Among all these
ERA Interim shows good comparison at all pressure levels.
Finally, by utilizing 700 profiles of rocketsonde temperature
data from 1979 to 1990 and satellite data such as HALOE and SABER,
we have constructed the time series of temperature dataset
from 1979 to 2010 from lower stratosphere to lower mesosphere.
We performed trend analysis to these long record temperature
data sets which we have constructed and compared with all
reanalysis data sets. This study will concentrate on
temperature trends over Indian region with In-situ and
reanalysis data sets. More details will be presented during the
workshop.
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