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An A-Train Climatology of Extratropical Cyclone Clouds
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Author and Affiliation:
Posselt, Derek J.(Michigan Univ., Ann Arbor, MI, United States)
van den Heever, Susan C.(Colorado State Univ., Boulder, CO, United States)
Booth, James F.(NASA Goddard Inst. for Space Studies, Science Collaborator, New York, NY, United States)
Del Genio, Anthony D.(NASA Goddard Inst. for Space Studies, New York, NY, United States)
Kahn, Brian(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Bauer, Mike(Columbia Univ., New York, NY, United States)
Abstract: Extratropical cyclones (ETCs) are the main purveyors of precipitation in the mid-latitudes, especially in winter, and have a significant radiative impact through the clouds they generate. However, general circulation models (GCMs) have trouble representing precipitation and clouds in ETCs, and this might partly explain why current GCMs disagree on to the evolution of these systems in a warming climate. Collectively, the A-train observations of MODIS, CloudSat, CALIPSO, AIRS and AMSR-E have given us a unique perspective on ETCs: over the past 10 years these observations have allowed us to construct a climatology of clouds and precipitation associated with these storms. This has proved very useful for model evaluation as well in studies aimed at improving understanding of moist processes in these dynamically active conditions. Using the A-train observational suite and an objective cyclone and front identification algorithm we have constructed cyclone centric datasets that consist of an observation-based characterization of clouds and precipitation in ETCs and their sensitivity to large scale environments. In this presentation, we will summarize the advances in our knowledge of the climatological properties of cloud and precipitation in ETCs acquired with this unique dataset. In particular, we will present what we have learned about southern ocean ETCs, for which the A-train observations have filled a gap in this data sparse region. In addition, CloudSat and CALIPSO have for the first time provided information on the vertical distribution of clouds in ETCs and across warm and cold fronts. We will also discuss how these observations have helped identify key areas for improvement in moist processes in recent GCMs. Recently, we have begun to explore the interaction between aerosol and cloud cover in ETCs using MODIS, CloudSat and CALIPSO. We will show how aerosols are climatologically distributed within northern hemisphere ETCs, and how this relates to cloud cover.
Publication Date: Dec 12, 2016
Document ID:
20170011693
(Acquired Dec 14, 2017)
Subject Category: METEOROLOGY AND CLIMATOLOGY
Report/Patent Number: GSFC-E-DAA-TN38095
Document Type: Oral/Visual Presentation
Meeting Information: AGU Fall Meeting; 12-16 Dec. 2016; San Francisco, CA; United States
Meeting Sponsor: American Geophysical Union; Washington, DC, United States
Contract/Grant/Task Num: NNX14AB99A; NA15OAR4310094
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Public use permitted
NASA Terms: AEROSOLS; ATMOSPHERIC COMPOSITION; CLIMATOLOGY; CLOUDS (METEOROLOGY); CYCLONES; FRONTS (METEOROLOGY); OPTICAL THICKNESS; PRECIPITATION (METEOROLOGY); THREE DIMENSIONAL MODELS; VERTICAL DISTRIBUTION; ALGORITHMS; ATMOSPHERIC GENERAL CIRCULATION MODELS; CALIPSO (PATHFINDER SATELLITE); MODIS (RADIOMETRY); MOISTURE CONTENT
Other Descriptors: CLOUDS; EXTRATROPICAL CYCLONES; PRECIPITATION; OBSERVATIONS
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