Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global monitoring of tropospheric water vapor with GPS radio occultation
  aboard CHAMP   The paper deals with application of GPS radio occultation (RO) measurements
aboard CHAMP for the retrieval of tropospheric water vapor profiles. The GPS RO
technique provides a powerful tool for atmospheric sounding which requires no
calibration, is not affected by clouds, aerosols or precipitation, and provides
an almost uniform global coverage. We briefly overview data processing and
retrieval of vertical refractivity, temperature and water vapor profiles from
GPS RO observations. CHAMP RO data are available since 2001 with up to 200 high
resolution atmospheric profiles per day. Global validation of CHAMP water vapor
profiles with radiosonde data reveals a bias of about 0.2 g/kg and a standard
deviation of less than 1 g/kg specific humidity in the lower troposphere. We
demonstrate potentials of CHAMP RO retrievals for monitoring the mean
tropospheric water vapor distribution on a global scale.

7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
16
The categories of this paper are: stat
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The categories of this paper are: econ
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex