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Atmospheric Composition

The Midlatitude Cirrus Experiment (MACPEX) is designed to provide a dataset of cirrus ice crystal size distributions, relative humidities, dynamics, etc, for a range of types of cirrus. We propose to address the ROSES call objectives with a combination of mission support, data analysis and modeling tasks. The PI (Dr. Jensen) proposes to serve as co-project scientist for the MACPEX mission. Duties will include mission planning leading up to the deployment, flight planning and aircraft coordination during the mission, post- mission organization of science team meetings, and general coordination of modeling and analysis efforts to ensure that the mission science objectives are achieved. In addition, the CoI (Dr. Pfister) will provide meteorological support and assistance with flight planning for the mission. The objectives of the modeling and analysis work are to (1) compare and evaluate measurements of ice crystal size distributions from different instruments, (2) evaluate the importance of small (< 50 microns) ice crystals for midlatitude cirrus microphysical and radiative properties, (3) understand the role of different microphysical and dynamical processes in controlling the evolution of ice crystals size distributions in midlatitude cirrus, and (4) to understand the processes controlling the frequency distribution of supersaturation with respect to ice within cirrus. We will use a range of modeling tools to address these objectives. Following on previous work, we will use one dimensional simulations driven by temperature fields from meteorological analyses with small-scale waves superimposed. In addition, we will use cloud-resolving simulations with detailed microphysics and radiative transfer to evaluate the impact of radiatively-driven convective motions on the evolution of midlatitude cirrus microphysical properties. We anticipate that this work will lead to improved understanding of cirrus microphysical properties, an improved understanding of how these microphysical properties are controlled by cloud processes, and ultimately more physically-based representations of cirrus in climate models.

Project PI: Eric Jensen/NASA Ames Research Center

NASA Ames Research Center, Mail Stop 245-4 Moffett Field, CA 94035 United States

Phone: (303) 492-3290

Fax: (303) 704-3039

Email: eric.j.jensen@nasa.gov

http://experts.nasa.gov/get_expert.php?id=1544

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Started: Sep 27, 2010

Last Activity: Jan 04, 2011

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