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UID:20250511T050800EDT-1954gsfsSm@132.216.98.100
DTSTAMP:20250511T090800Z
DESCRIPTION: \n\nStudent Seminar Series\n\nDepartment of Atmospheric & Ocea
 nic Sciences\n\npresents\n\na talk by\n\nJing Feng\n	PhD candidate\n\nDistr
 ibution of upper tropospheric and lower stratospheric (UTLS) water vapor i
 nfluenced by deep convections\n\nDespite its scarcity\, water vapor in the
  upper troposphere and lower stratosphere (UTLS) is crucial to the climate
  due to both its radiative and chemical impacts. The distribution of water
  vapor in this region\, however\, remains poorly measured\, partly due to 
 deep convection processes that injected potential water sources through th
 e cold trap. Researchers have found inconsistency among products from diff
 erent satellite missions. This brings large uncertainty to stratospheric w
 ater vapor decadal variation and its contribution to climate feedback.\n	\n
 	The focus of this study is to apply an innovative method to sounding UTLS 
 water vapor profiles above opaque deep convective cloud layers\, using nad
 ir view satellite measurements. The retrieval algorithm is performed based
  on a widely used Optimal Estimation method that combines satellite observ
 ation and historical data to give an optimal estimation of the atmospheric
  state. Theoretical assessments show that this method largely eliminates m
 ajor difficulties in a clear-sky retrieval\, including the non-monotonic t
 emperature around the tropopause\, and the spectral signal of upper-level 
 water vapor being weak relative to noise from lower atmosphere uncertainty
 .\n\nComparisons between the retrieval using radiance data from Atmospheri
 c Infrared Sounder (AIRS\, https://airs.jpl.nasa.gov/) and collocated airc
 raft measurements show that the retrieval can detect the water vapor anoma
 lies caused by deep convective events. Using this approach in synergy with
  cloud properties retrieved by CloudSat\, we further characterize the wate
 r vapor distribution pattern above deep convection events passed by A-trai
 n satellites in the past decades.\n\nWednesday Oct 16/ 2.30 PM/ Room 934 B
 urnside Hall\n\n \n\n \n\n \n
DTSTART:20191016T183000Z
DTEND:20191016T193000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Distribution of upper tropospheric and lower stratospheric (UTLS) w
 ater vapor influenced by deep convections
URL:/meteo/channels/event/distribution-upper-troposphe
 ric-and-lower-stratospheric-utls-water-vapor-influenced-deep-convections-3
 01658
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