X. Jiang • D. E. Waliser • J.-L. Li • C. Woods, Vertical cloud structures of the boreal summer...
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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.

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Speaker li chiang jiang

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

Vertical cloud structures of the boreal summer intraseasonal variability based on CloudSat observations and ERA-interim reanalysis

Xianan Jiang • Duane E. Waliser • Jui-Lin Li •Christopher Woods

Speaker:Li-Chiang Jiang


Outline

Outline

  • Introduction

  • Datasets

  • An index for the boreal summer intraseasonal variability (BSISV)

  • Vertical cloud structures of the northward propagating BSISV

  • Summary


Introduction

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 associated with the northward propagating BSISV.


Introduction1

Introduction

  • 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.


Speaker li chiang jiang

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)


Speaker li chiang jiang

An index for the BSISV


Speaker li chiang jiang

An index for the BSISV


Speaker li chiang jiang

Vertical cloud structures of the northward propagating BSISV

CloudSat LWC

CloudSat IWC


Speaker li chiang jiang

Vertical cloud structures of the northward propagating BSISV

ERA-interim LWC

ERA-interim IWC


Speaker li chiang jiang

Vertical cloud structures of the northward propagating BSISV

LWC

IWC

紅圈:不同的地方

CloudSat

ERA-

interim


Speaker li chiang jiang

Vertical cloud structures of the northward propagating BSISV

高層雲

Total

CloudSat

高積雲

對流雲

ERA-

interim

積\層積雲

卷雲


Speaker li chiang jiang

Summary and discussion

  • Increased LWC in the lower troposphere is located north of the BSISVrainfall 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.


Speaker li chiang jiang

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.


Speaker li chiang jiang

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.


Thanks for your attention

Thanks for your attention !


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