speaker : li-chiang jiang
DESCRIPTION
X. Jiang • D. E. Waliser • J.-L. Li • C. Woods, Vertical cloud structures of the boreal summer intraseasonal variability based on CloudSat observations and ERA-interim reanalysis,2010. - PowerPoint PPT PresentationTRANSCRIPT
Vertical cloud structures of the boreal summer intraseasonal variability based on CloudSat obse
rvations and ERA-interim reanalysis
Speaker : Li-Chiang Jiang
Xianan Jiang • Duane E. Waliser • Jui-Lin Li •Christopher Woods
X. Jiang • D. E. Waliser • J.-L. Li • C. Woods, Vertical cloud structures of the boreal summer intraseasonal variability based on CloudSat observations and ERA-interim reanalysis,2010
Outline
Introduction Datasets An index for the boreal summer intraseasonal
variability (BSISV) Vertical cloud structures of the northward pr
opagating BSISV Summary
Introduction
Sikka and Gadgil(1980);Cadet(1986); Lawrence and Webster(2002).
The meridional propagation of the BSISV is found to be intimately associated with active and break phases of the Asian summer monsoon
Jiang et al. (2004) Identified prominent meridional asymmetric structures associa
ted with the northward propagating BSISV.
Hsu et al.(2004);Fu et al.(2006)
The northward shift of low-level moisture perturbation relative to the BSISV convection, which may suggest a pre-conditioning process for its northward propagation.
An “easterly vertical wind shear” mechanism to explain the northward propagation of the BSISV.
Introduction
Datasets
European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-interim reanalysis
Liquid water content (LWC) and ice and water content (IWC) (2006 ~ 2008)
CloudSat dataset Liquid water content (LWC) and ice and water content (IWC)
(2006 ~ 2008) Tropical Rainfall Measuring Mission (TRMM)
Daily mean rainfall with a horizontal resolution of 1° × 1° (2006~2008)
An index for the BSISV
An index for the BSISV
Vertical cloud structures of the northward propagating BSISV
CloudSat LWC CloudSat IWC
Vertical cloud structures of the northward propagating BSISV
ERA-interim LWC ERA-interim IWC
Vertical cloud structures of the northward propagating BSISV
LWC IWC
CloudSat
ERA-interim
紅圈:不同的地方
Vertical cloud structures of the northward propagating BSISV
CloudSat
ERA-interim
Total
對流
雲
卷雲
高層
雲
高積
雲
積\
層積
雲
Increased LWC in the lower troposphere is located north of the BSISV rainfall maximum, and therefore leads the convection,so northward displacement.
Enhanced LWC anomalies to the north of the BSISV convection center are largely associated with low-level cumulus/stratocumulus clouds.
Summary and discussion
The maximum LWC anomalies are detected in the lower troposphere based on CloudSat, and in the middle troposphere in the ERA-interim.
Enhanced cloud IWC is evident in the upper troposphere corresponding to enhanced BSISV convection.
Summary and discussion
Aforementioned differences in LWC and IWC structures associated with the BSISV could be
ascribed to model biases and differences between CloudSat and ERA-interim datasets could be due to data sampling.
Summary and discussion
Thanks for your attention !