Characteristics of Mesoscale Convective Systems during DYNAMO/AMIE
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Characteristics of Mesoscale Convective Systems during DYNAMO/AMIE
Angela Rowe and Robert Houze, Jr.University of Washington
ASR Fall Working GroupsAMIE/MJO Breakout
November 2013Rockville, MD
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S-PolKa
Zuluaga and Houze (2013)
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6 7 8 1 2 3 4 5 6 7 8 1 2 3 5 54 4 6
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Echo distributions
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Hydrometeor profiles
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MCSs• Group1: embedded convection, easterlies
over westerlies, conv/strat move in opposite directions (14-15 Oct, 24 Oct, 17 Nov)
• Group 2: Increased westerlies at end of active phases, drier mid-levels, weaker stratiform, conv/strat move same direction (31 Oct, 1 Dec, 2-3 Dec)
• Group 3: Deep, strong westerlies in Dec active phase, fast-moving squall-lines
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Group 1• Active phases of Oct, Nov
Yamada et al. (2010)
MISMO
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Group 1
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Group 1
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Group 2• End of active phases
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Group 2
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Group 3• Squall lines in Dec active phase
October December
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Group 3
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TOGA COARE• Transport of
westerly momentum downward in strong westerly region (Houze et al. 2000)– Positive feedback
Houze et al. (2000)
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Group comparison
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Group comparison
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Group comparisonKennedy et al. (2011)
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Take-home points- Similar hydrometeor profiles with low relative occurrence of
graupel and enhanced wet aggregation during active periods as deep convection transitions to stratiform echo
- December active period characterized by shallower convection and less robust stratiform
- Individual MCSs show different characteristics for three groupings based on the environmental wind profile- Increased westerlies generally resulted in shallower convection and less
widespread stratiform as the active phases transitioned to more suppressed conditions
- Fast-moving squall lines in Dec featured shallow convection and descending rear-inflow/ momentum transport (similar to TOGA COARE)- Oct/Nov active phase MCSs contained deep embedded convection in a
weakly sheared environment with robust stratiform (similar to MISMO)
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Thank you!
Funded by NSF Grant # AGS-1059611 and DOE Grant # DE-SC0008452