Ulrike Romatschke, Robert Houze, Socorro Medina

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Presentation transcript:

Ulrike Romatschke, Robert Houze, Socorro Medina Regional, Seasonal and Diurnal Variations of Convection in the Asian Monsoon Region Authors Ulrike Romatschke, Robert Houze, Socorro Medina Clouds and Precipitation Seminar, University of Washington, 15 November 2007

Region of Study

Outline Dataset Comparison with Houze et al. Premonsoon – Monsoon Introduction Dataset Regonal Variations Comparison with Houze et al. Seasonal Variations Premonsoon – Monsoon Diurnal Variations Dependence on topography Conclusion and future Work

Dataset TRMM Precipitation Radar (PR), Version 6 Products 2A23: Radar Rain Characteristics 2A25: Radar Rainfall Rate and Profile Monsoon Season: June - September 1999-2001 2004-2006 Premonsoon Season: May 1999-2006

Data Processing Gridspacing Interpolation on Cartesian Grid horizontal: ~5 km vertical: 250 m Search for individual systems contiguous pixels define system characteristic parameters (e.g. time, location, size,…)

Definitions Deep Intense Convective Cores 20 16 12 8 4 Definitions Height [km] Deep Intense Convective Cores 40 dBZ echo > 10 km in hight Wide Intense Convective Cores 40 dBZ echo area > 1,000 km² Broad Stratiform Echos area > 50,000 km² 0 42.5 85 Distance [km] 24 22 20 Latitude 84 86 88 90 Longitude 15 20 Latitude 90 95 [dBZ] Longitude

Objectives Compare with Houze et al. (2007) Extend dataset geographical region Premonsoon Season Diurnal Cycle Find especially active regions

Outline Dataset Comparison with Houze et al. Premonsoon – Monsoon Introduction Dataset Regonal Variations Comparison with Houze et al. Seasonal Variations Premonsoon – Monsoon Diurnal Variations Dependence on topography Conclusion and future Work

Comparison Deep Intense Convective Cores 1999-2001/2004-2006 2002-2003

Large Scale Flow Patterns during Monsoon 1000 mb 700 mb 40 30 20 10 60 70 80 90 100/60 70 80 90 100 Terrain [km]

Comparison Wide Intense Convective Cores 1999-2001/2004-2006 2002-2003

Comparison Broad Stratiform Systems 1999-2001/2004-2006 2002-2003

Outline Dataset Comparison with Houze et al. Premonsoon – Monsoon Introduction Dataset Regonal Variations Comparison with Houze et al. Seasonal Variations Premonsoon – Monsoon Diurnal Variations Dependence on topography Conclusion and future Work

Deep Intense Convective Cores Premonsoon Monsoon

The Indian Dry-Line Weston (1971) 1000 mb 700 mb Surface p [mb] and v 500 mb v Weston (1971)

The Indian Dry-Line 200 mb 700 mb 1000 mb Monsoon Premonsoon

Wide Intense Convective Cores Premonsoon Monsoon

Wide vs. Deep Intense Convective Cores Premonsoon Premonsoon

Wide vs. Deep Intense Convective Cores Monsoon Monsoon

Wide vs. Deep Intense Convective Cores Ganges Delta Monsoon

Broad Stratiform Systems Premonsoon Monsoon

Broad Stratiform Systems Rain Climatology Monsoon Xie et al. (2006)

Outline Dataset Comparison with Houze et al. Premonsoon – Monsoon Introduction Dataset Regonal Variations Comparison with Houze et al. Seasonal Variations Premonsoon – Monsoon Diurnal Variations Dependence on topography Conclusion and future Work

Diurnal Cycle, Monsoon

Diurnal Cycle

Diurnal Cycle

Diurnal Cycle, Monsoon

Diurnal Cycle Deep Intense Convective Cores Monsoon

Diurnal Cycle Deep Intense Convective Cores Monsoon

Diurnal Cycle Deep Intense Convective Cores Monsoon

Diurnal Cycle Deep Intense Convective Cores Monsoon

Diurnal Cycle Deep Intense Convective Cores Premonsoon

Diurnal Cycle Deep Intense Convective Cores Premonsoon Surface p [mb] and v Weston (1971) Xie et al. (2006)

Diurnal Cycle, Deep Intense Convective Cores, Premonsoon Zuidema (2002) Mean percent high cloudiness Cloud Top < 210 K May – September 1999

Diurnal Cycle, Monsoon

Diurnal Cycle, Monsoon Wide Intense Convective Cores 1999-2001 vs 1999-2001 2004-2006

Diurnal Cycle Wide Intense Convective Cores Monsoon

Diurnal Cycle Wide Intense Convective Cores Monsoon Xie et al. (2006)

Diurnal Cycle Wide Intense Convective Cores Premonsoon - Monsoon

Diurnal Cycle Wide Intense Convective Cores Premonsoon

Diurnal Cycle, Monsoon

Diurnal Cycle, Monsoon

Diurnal Cycle Broad Stratiform Systems Monsoon

Diurnal Cycle Broad Stratiform Systems Monsoon

Diurnal Cycle Broad Stratiform Systems Monsoon

Diurnal Cycle Broad Stratiform Systems Monsoon Williams and Houze (1987)

Outline Dataset Comparison with Houze et al. Premonsoon – Monsoon Introduction Dataset Regonal Variations Comparison with Houze et al. Seasonal Variations Premonsoon – Monsoon Diurnal Variations Dependence on topography Conclusion and future Work

Conclusions Larger independent dataset seems to confirm Houze et al. (2007) Premonsoon – Monsoon • Shift in places of occurrence of Deep and Wide Intense Convective Cores. • More Wide Intense Convective Cores and Broad Stratiform Systems over the ocean during Monsoon. Diurnal Cycles • Strong afternoon peak in Deep Intense Convective Cores. • Afternoon and night peaks in Wide Intense Convective Cores. • Evening minimum in Broad Stratiform Systems. Rain climatology compares • with Broad Stratiform Systems over the ocean. • with Wide Intense Convective Cores at the Himalayan Foothills. • not with Deep Intense Convective Cores.

Conclusions Larger independent dataset seems to confirm Houze et al. (2007) Premonsoon – Monsoon • Shift in places of occurrence of Deep and Wide Intense Convective Cores. • More Wide Intense Convective Cores and Broad Stratiform Systems over the ocean during Monsoon. Diurnal Cycles • Strong afternoon peak in Deep Intense Convective Cores. • Afternoon and night peaks in Wide Intense Convective Cores. • Evening minimum in Broad Stratiform Systems. Rain climatology compares • with Broad Stratiform Systems over the ocean. • with Wide Intense Convective Cores at the Himalayan Foothills. • not with Deep Intense Convective Cores. This is just the beginning!

Future Work Get 2002/2003 Version 6 data. Statistics for other variables. Look at specific regions • physical background • different variable fields (e.g. wind) • satellite data

Variables Orbitnumber Number of convective pixels Date Time Number of pixels 3D Number of pixels 2D Latitude Longitude Height Longest horizontal dimension Height of terrain Area Number of convective pixels Number of stratiform pixels Convective, stratiform, total • rain rate • volumetric rain rate • rain fraction • area fraction

Future Work Get 2002/2003 Version 6 data. Statistics for other variables. Look at specific regions • physical background • different variable fields (e.g. wind) • satellite data

Future Work