The tropical convective cloud population Peking University Seminar, Beijing, 4 July 2011 Robert Houze University of Washington.

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Presentation transcript:

The tropical convective cloud population Peking University Seminar, Beijing, 4 July 2011 Robert Houze University of Washington

The tropical convective cloud population What do we know? How has technology contributed? What comes next?

Before Satellites

Small cumulus Cumulus congestus Cumulonimbus Visual Observation

Radiosonde data in the tropics Riehl & Malkus 1958 “Hot tower hypothesis” Joanne Simpson

GCM grid Convective parameterization

Satellite Observations: an “inconvenient truth”

Large cloud shields

Satellite view of the tropical cloud population Explained satellite pictures Retained the hot tower notion Included smaller clouds Early 1970’s

Radars: The second “inconvenient truth”

GATE 1974

ships! 12 aircraft! ships! 12 aircraft! 4 shipborne scanning digital C-band radars

More Field Projects to Study Convection BoB 1979 JASMINE 1999 EPIC 2001 TEPPS 1997 (Dashed: No sounding network) Ground, ship, & airborne cm radars

Houze et al. (1980) Post-GATE view of the tropical cloud population MESOSCALE CONVECTIVE SYSTEMS (MCSs) STRATIFORM RAIN GCM grid Hot Tower

Houze 1982 Heating and cooling processes in an MCS

Simplified MCS Heating Profiles Schumacher et al Height (km) Deg K/day Convective Stratiform

MCS Net Heating Profiles Height (km) Deg K/day 0% stratiform 40% stratiform 70% stratiform Schumacher et al. 2004

Precipitation Radar in Space

The TRMM Satellite Ku-band Radar Low altitude, low inclination orbit

Combined satellite rainfall July 2000 TRMM plus passive microwave sensors + other Combined satellite rainfall July 2000 TRMM plus passive microwave sensors + other Rainfall mapping revolutionized!

TRMM Satellite Instrumentation Kummerow et al, 1998  = 2 cm Important! PR measures 3D structure of radar echoes

How tropical rain is distributed by cloud size and type

Schumacher & Houze Years of TRMM PR data Large Cbs MCSs Small isolated Cbs

Traditional conceptual view of mean meridional distribution of tropical convection Simpson 1992

Cu congestus Small Cb “Trimodal distribution” Suggested by TOGA COARE radiosonde data Johnson et al. 1999

Cloud Radars

“ Trimodal” Distribution Frequency of cloud-top height from 9 mm wavelength vertically pointing radar X MANUSMANUS Hollars et al. 1999

Cloud Radar in Space

The A-Train Satellites show the complete MCS Yuan and Houze 2010

MCSs Over the Whole Tropics Yuan and Houze 2010 (< km 2 ) (> km 2 )

Morphology of MCS anvils in different parts of the tropics Data from CloudSat mm-Wavelength Cloud Profiling Radar Yuan and Houze 2010

Internal structure of MCS anvils shown by CloudSat Cloud Profiling Radar Yuan, Houze, and Heymsfield 2011 AfricaIndian Ocean

convective rainstratiform rain graupel snow Conceptual model of anvil microphysics Cetrone and Houze 2011

Addu Atoll Five radars on a tiny island

HUMIDITY DUAL WAVELENGTH Water vapor CM-WAVELENGTH Precipitation MM-WAVELENGTH Non-precipitating Cumulus MM-WAVELENGTH Anvil cloud * POLARIMETRY Microphysics DOPPLER Air motions Radar Supersite Approach Will document many aspects of the convective population

Summary & Conclusions

Timeline of progress Pre-satellite era  Hot towers Radars in field projects  MCSs, convective and stratiform precipitation regions Precipitation radar in space  Global patterns—convective, stratiform, shallow Cloud radars  Ground based—trimodality of the population  Satellite based—global distributions of MCSs, anvils,... Dual wavelength  Water vapor

Spectrum of convective cloud types and sizes covers a wide range of types and sizes of convective entities Mesoscale systems with stratiform rain Top-heavy heating profiles Multimodal size distributions Shallow isolated cells Structures of large anvil clouds Global variability of the population What we’ve learned

Where we are going How does convective population project onto larger- scale dynamics? Latent heating profiles Radiative heating profiles in anvils of MCSs Nonprecipitating convective clouds Relation between humidity field and cloud population evolution Role of clouds in MJO, ENSO, monsoon, & coupled equatorial waves

End This research was supported by NASA grants NNX07AD59G, NNX07AQ89G, NNX09AM73G, NNX10AH70G, NNX10AM28G, NSF grants, ATM , ATM , DOE grant DE-SC / ER-6

Extra Slides

Internal structure of “thick” anvils shown by CloudSat Yuan, Houze, and Heymsfield 2011 Indian Ocean Africa

Internal structures of MCS anvils Cetrone & Houze 2011 and also Yuan et al CloudSat Data from MCSs seen by ARM W-band radar in Niamey, Niger Height (km) Reflectivity (dBZ)

Internal structures of MCS anvils Cetrone & Houze 2011 and also Yuan et al CloudSat Data from MCSs seen by ARM W-band radar in Niamey, Niger Height (km) Reflectivity (dBZ)