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25/10/2018: séminaire de Yunying LI

Cloud Vertical Structures Associated with Northward Advance of the East Asian Summer Monsoon (2e partie du séminaire du 4/10).
Quand ? Le 25/10/2018,
de 10:30 à 12:30
Où ? Salle de réunion du LMD/Jussieu (T45-55, 3e étage)
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Téléphone 0144272799
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Yunying Li (Institute of Meteorology and Oceanography, China) est invitée par Laurent Li au LMD jusqu'à fin novembre.  

        Based on the CloudSat dataset, the vertical structures of the cloud
        water content and cloudiness associated with the northward advance of
        the East Asian summer monsoon (EASM) are investigated by using
        composite analysis method with 22 northward-advancing EASM events
        selected by extended empirical orthogonal function analysis. The positive
        anomaly of the liquid water content exhibits an apparent vertical tilting
        structure on the north side of the convective center during the northward
        advance of the EASM, tilting northward from the upper to the lower
        atmosphere over 7 degrees of latitude. However, the positive anomaly of
        the ice water content overlaps with the convective center without obvious
        vertical tilting structure. The positive anomaly of the cloud fraction also
        demonstrates an obvious northward tilting structure. This tilting structure
        is composed of the different spatial positions of various cloud types from
        the upper to the lower atmosphere. Deep convective clouds are located in
        the convective center and can be regarded as the reference of the
        convective center. High clouds occupy the upper troposphere and lag
        behind the convective center by nearly 4 degrees of latitude. Altostratus
        appears in the middle troposphere with a maximum cloud fraction core
        lagging behind the convective center by about 2 degrees of latitude.
        Altocumulus and cumulus mainly occur in the lower troposphere with
        maximum cloud fraction cores leading the convective center by
        approximately 3 degrees of latitude. These northward tilting structures of
        the liquid water content and cloudiness may facilitate the northward
        advance of the EASM.

Venez nombreux !

MP

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