chuntao liu and ed zipser department of atmospheric sciences university of utah lhasa, july 2010
DESCRIPTION
Importance of the diurnal cycle of deep convection in understanding the role of Asian monsoon in the UTLS transport - perspective from multi-satellite observations. Chuntao Liu and Ed Zipser Department of Atmospheric Sciences University of Utah Lhasa, July 2010. Outline. - PowerPoint PPT PresentationTRANSCRIPT
Importance of the diurnal cycle of deep convection in understanding the role of Asian
monsoon in the UTLS transport
- perspective from multi-satellite observations
Chuntao Liu and Ed Zipser
Department of Atmospheric SciencesUniversity of Utah
Lhasa, July 2010
Outline
• What do different satellite observations tell us about the deep convection?
• Intense convection near tropopause (TRMM)• Diurnal variation of convection and clouds• Day vs. night ice cloud (CloudSat, TRMM VIRS)
thin ice Clouds (Calipso) water vapor near tropopause (MLS)• Conclusion
What do different satellite observations tell us about the deep convection?
• TRMM PR• CloudSat CPR • Caliop• Infrared
• Microwave
Infrared TB < 210
K
TRMMPR 20 dBZat 14 km
Two types of deep convection
Liu and Zipser, 2007
Deep convection with large particles at 14 km from TRMM Precipitation Radar (PR)
Rainfall ≠ Deep convection (JJA)
Clouds from infrared images (TRMM VIRS JJA)cold cloud ≠ deep convective core
Diurnal variation of deep convection and cloudsTRMM PR 20 dBZ at 14 km TRMM VIRS infrared < 235 K
TRMM VIRS infrared < 210 K
A-Train satellites sample time vs. diurnal cycles of deep convection
Liu et al., 2008, JGR
Clouds from CloudSat Profiling Radar (CPR)
Thin cloud day vs. night
Thin clouds from Calipso
Thin clouds over Asian day vs. night
Water vapor from ARUA MLS JJA 146 hPa
10% DiffDay vs. Night
Water vapor from ARUA MLS 100 hPa
5% DiffDay vs. Night
Day vs. Night Water vapor from ARUA MLS
Conclusions• TRMM observations show that there are strong diurnal cycles of
deep convection and cold cloud over land and over ocean during the Asian monsoon.
• CloudSat and Calipso show that there are large day vs. night differences in the clouds near tropopause (more clouds at the night time 1:30 AM over land)
• AURA MLS observations show that at 146 hPa, there are more water vapor at night time (1:30 AM) than the day time over land. This is almost direct opposite to the day vs. night differences of water vapor at 100 hPa.
• A-Train satellites observations show a strong diurnal variations of the cloud and the water vapor near the tropopause that might directly related to the UTLS exchange. However, more observations covering the diurnal cycles will be needed to fully understand the process.
A conceptual model over land
Tropopause
Diurnal cycles of deep convection, lightning and clouds
Liu and Zipser, 2008, GRL
Rainfall ≠ Deep convectionseasonal variations
Tropopause NCEP and COSMIC
Tropopause from NCEP and COSMIC
Calipsolayer cloud
profiles
More cloud detected at the night time 1:30 AM is due to the higher signal/noise rate of Lidar at night.
Note that layer clouds over land develop higher than over ocean, there are many possible explanations: a) due to deep convection lifting and cooling; b) due to radiative cooling and growing of thin clouds. c) note that the mean tropopause height is higher over red region.