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| Titel |
Tropical Stratospheric Cloud climatology from the PATMOS-x dataset - an assessment of convective contributions to stratospheric water |
| VerfasserIn |
J. K. Nielsen, A. K. Heidinger, M. J. Foster |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067619
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| Zusammenfassung |
| The PATMOS-x level 2b climatology, generated using three decades of AVHRR
measurements, contains valuable information about the past global cloud record. We extract
climatologies of tropical deep convective clouds from the PATMOS-x data set,
based on the 10.30-11.30 micro meter brightness temperature. A comparison of the
cross ropopause convective cloud frequency between ISCCP and PATMOS-x shows
that PATMOS-x has a greater frequency of occurrence than does the ISCCP, and
this enhanced frequency is attributed to greater horizontal resolution (2 km) in the
PATMOS-x data. The high resolution makes this dataset suitable for a search for cross
tropopause convection, which happens on length scales down to 1 km. We find there
have been several changes in deep convective activity over land during the period
1982 to 2009. We explore specifically the epoch of the HALOE satellite, and find a
correlation between land deep convective activity and anomalies in the HALOE
stratospheric water retrievals. A simple model is able to predict stratospheric water
vapor concentrations highly correlated to that observed using only frequency of
deep convection. From this we conclude that deep convection over land contributes
to moistening of the lowest tropical stratosphere on seasonal, annual and decadal
timescales[1].
[1] GEOPHYSICAL RESEARCH LETTERS, VOL. 38, L18801, 5 PP., 2011
doi:10.1029/2011GL049429 |
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