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| Titel |
Study of the microphysical properties associated with the Monsoon Intraseasonal Oscillation as seen from the TRMM observations |
| VerfasserIn |
M. Halder, P. Mukhopadhyay, S. Halder |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 30, no. 6 ; Nr. 30, no. 6 (2012-06-01), S.897-910 |
| Datensatznummer |
250017230
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| Publikation (Nr.) |
 copernicus.org/angeo-30-897-2012.pdf |
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| Zusammenfassung |
| The spatio-temporal variability of Indian Summer Monsoon is well studied
based on different types of rainfall data. However, very few attempts have
been made to study the underlying role of clouds and its hydrometeors on
Monsoon Intraseasonal Oscillations. The northward propagating Monsoon
Intraseasonal Oscillations and its characteristics remain a challenge for
the numerical modelers even today. In view of this, we have set out to analyze
the role of cloud hydrometeors and their linkage with northward propagating
Monsoon Intraseasonal Oscillations. The science question that we intend to
address here is whether the different phases of the cloud hydrometeors show
similar propagation characteristics as that of rainfall, and what are the
relations of their phases with the convection centre using Tropical Rainfall
Measuring Mission data. In answering the question, we have analyzed ten
years of Tropical Rainfall Measuring Mission 2A12 hydrometeor data over
Indian region. Our analyses show that the cloud water and cloud ice do
show a large scale organization during the Indian Summer Monsoon regime of
June–September, and systematically progress northward getting
initiated over equatorial Indian Ocean. On further analyses, we found that
cloud water actually leads the rainfall and cloud ice lags the rainfall. We
have further demonstrated the process by analyzing dynamical parameters from
Modern Era-Retrospective Analysis for Research and Applications. The
presence of cloud water in the lower troposphere in the leading edge of
rainfall indicates the lower level moistening and preconditioning of the
convective instability due to enhanced moisture convergence. Subsequently,
deep convection is triggered, which generates hydrometeor above freezing
level and cloud ice in the upper troposphere. To quantify objectively the
relation among cloud liquid water, cloud ice and rainfall, the lag
correlation is computed with respect to convection center, where the above
hypothesis is established that cloud liquid water leads the rainfall and
cloud ice lag. This relation among hydrometeors may help the numerical
modelers to incorporate such processes for capturing the characteristics of
Monsoon Intraseasonal Oscillations. |
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