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Global Variability of Mesoscale Convective System Anvil Structure Jian Yuan Jasmine Cetrone Robert A. Houze, Jr. ARM Cloud Modeling Working Group, Princeton,

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Presentation on theme: "Global Variability of Mesoscale Convective System Anvil Structure Jian Yuan Jasmine Cetrone Robert A. Houze, Jr. ARM Cloud Modeling Working Group, Princeton,"— Presentation transcript:

1 Global Variability of Mesoscale Convective System Anvil Structure Jian Yuan Jasmine Cetrone Robert A. Houze, Jr. ARM Cloud Modeling Working Group, Princeton, 20 November 2008

2 ANVIL ACAC ASAS Goal: Global variation of the structure and composition of MCS anvils

3 Objective Identification of MCSs Rain Rate: AMSR-E  Aqua L2B Global Swath Rain Rate (AE_Rain). Horizontal Cloud Structure: MODIS  MODIS/Aqua Clouds 1km and 5km 5-Min L2 Wide Swath Subset along CloudSat V2 at GES DISC(GES_DISC_MAC06S1_v2) Vertical Cloud Structure: CloudSat & ARM  Products 2B-GEOPROF; 2B-CWC-RO; 2B-FLXHR; …

4 Identification of High Cloud Features MODIS Tb 11 (K)AMSR/E Rain (mm/h) COMBINED Cloud Element Rain Core FEATURE MASK

5 Precipitation from deep cloud features Percentages are contributions of total rainfall from all high cloud systems within each region for the whole 12 months of 2007.

6 Rain-weighted frequency of cloud features by size and coldness of cloud top of rain area

7 Identify MCSs:  Rain area 2,000-250,000 km 2  Mean Tb11 <235 K  Rain area with R>10 mm/hr > 200km 2 Stratify MCSs  Cold: Tb11_min<208 K  Warm: 208 K o <Tb11_min<220 K  Subdivide Cold and Warm by size Selection of Mesoscale Convective Systems

8 Cold MCS (Smallest 30%)

9 Warm MCS (Smallest 30%)

10 Cold MCSs (Biggest 30%)

11 Warm MCS (Biggest 30%)

12 Vertical Structure of Anvils

13

14 Compare to ARM Thick Anvil Results Niamey ARM site Cetrone & Houze 2009

15 Reflectivity (dBZ) 0102030405060 Height (km) 0 4 8 12 16 2 6 10 14 Reflectivity (dBZ) 0102030405060 Reflectivity (dBZ) 0102030405060 West AfricaMaritime ContinentBay of Bengal TRMM radar observations of convective echoes in MCSs Cetrone & Houze 2009

16 OBJECTIVE MODIS/AMSR-E METHODOLOGY CAPTURES TROPICAL MCS CHARACTERISTICS  Cloud tops of MCSs colder over Africa and West Pacific than over East Pacific and tropical Atlantic  Larger MCSs more frequent over ocean  Smaller MCSs more frequent over land  MJO AND South Asian monsoon favor larger, colder MCSs  Etc. PRELIMINARY CLOUDSAT & ARM SITE RESULTS SHOW ANVIL STRUCTURE FOR OBJECTIVELY IDENTIFIED MCSs  Africa: Stronger echo in deep raining cloud reaches higher altitude with max reflectivity concentrated at lower levels--suggests graupel  West Pacific: Narrow peaked distribution of reflectivity with values increasing downward--suggests diffusion, aggregation processes Conclusions

17 Thank You

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