Cirrus Microphysical Properties from Stellar Aureole Measurements, Phase I

doi:10.2172/1038676

GSTDTAP > 地球科学

DOI	10.2172/1038676
报告编号	DOE/SC0006325-1
来源ID	OSTI ID: 1038676
	Cirrus Microphysical Properties from Stellar Aureole Measurements, Phase I
	DeVore, J. G.; Kristl, J. A.; Rappaport, S. A.
	2012-04-20
出版年	2012
语种	英语
国家	美国
领域	地球科学
英文摘要	While knowledge of the impact of aerosols on climate change has improved significantly due to the routine, ground-based, sun photometer measurements of aerosols made at AERONET sites world-wide, the impact of cirrus clouds remains much less certain because they occur high in the atmosphere and are more difficult to measure. This report documents work performed on a Phase I SBIR project to retrieve microphysical properties of cirrus ice crystals from stellar aureole imagery. The Phase I work demonstrates that (1) we have clearly measured stellar aureole profiles; (2) we can follow the aureole profiles out to ~1/4 degree from stars (~1/2 degree from Jupiter); (3) the stellar aureoles from cirrus have very distinctive profiles, being flat out to a critical angle, followed by a steep power-law decline with a slope of ~-3; (4) the profiles are well modeled using exponential size distributions; and (5) the critical angle in the profiles is ~0.12 degrees, (6) indicating that the corresponding critical size ranges from ~150 to ~200 microns. The stage has been set for a Phase II project (1) to proceed to validating the use of stellar aureole measurements for retrieving cirrus particle size distributions using comparisons with optical property retrievals from other, ground-based instruments and (2) to develop an instrument for the routine, automatic measurement of thin cirrus microphysical properties.
英文关键词	Aerosols Cirrus Ice Crystal Size Distributions Climate Change Stellar Aureole Measurement Solar Aureole Measurement
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/5588
专题	地球科学
推荐引用方式 GB/T 7714	DeVore, J. G.,Kristl, J. A.,Rappaport, S. A.. Cirrus Microphysical Properties from Stellar Aureole Measurements, Phase I,2012.