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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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

  • Introduction

  • Datasets

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

  • Vertical cloud structures of the northward propagating 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 associated with the northward propagating BSISV.


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.


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

紅圈:不同的地方

CloudSat

ERA-

interim


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


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.


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.


Thanks for your attention !


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