气候变化领域集成服务门户(CCPortal): Northern Hemisphere contrail properties derived from Terra and Aqua MODIS data for 2006 and 2012

CCPortal

DOI	10.5194/acp-19-5313-2019
	Northern Hemisphere contrail properties derived from Terra and Aqua MODIS data for 2006 and 2012
	Duda D.P.; Bedka S.T.; Minnis P.; Spangenberg D.; Khlopenkov K.; Chee T.; Smith W.L.; Jr.
发表日期	2019
ISSN	16807316
起始页码	5313
结束页码	5330
卷号	19 期号:8
英文摘要	Linear contrail coverage, optical property, and radiative forcing data over the Northern Hemisphere (NH) are derived from a year (2012) of Terra and Aqua Moderateresolution Imaging Spectroradiometer (MODIS) imagery and compared with previously published 2006 results (Duda et al., 2013; Bedka et al., 2013; Spangenberg et al., 2013) using a consistent retrieval methodology. Differences in the observed Terra-minus-Aqua screened contrail coverage and patterns in the 2012 annual-mean air traffic estimated with respect to satellite overpass time suggest that most contrails detected by the contrail detection algorithm (CDA) form approximately 2 h before overpass time. The 2012 screened NH contrail coverage (Mask B) shows a relative 3% increase compared to 2006 data for Terra and increases by almost 7% for Aqua, although the differences are not expected to be statistically significant. A new post-processing algorithm added to the contrail mask processing estimated that the total contrail cirrus coverage visible in the MODIS imagery may be 3 to 4 times larger than the linear contrail coverage detected by the CDA. This estimate is similar in magnitude to the spreading factor estimated by Minnis et al. (2013). Contrail property retrievals of the 2012 data indicate that both contrail optical depth and contrail effective diameter decreased approximately 10% between 2006 and 2012. The decreases may be attributed to better background cloudiness characterization, changes in the waypoint screening, or changes in contrail temperature. The total mean contrail radiative forcings (TCRFs) for all 2012 Terra observations were -6:3, 14.3, and 8.0mWm-2 for the shortwave (SWCRF), longwave (LWCRF), and net forcings, respectively. These values are approximately 20% less than the corresponding 2006 Terra estimates. The decline in TCRF results from the decrease in normalized CRF, partially offset by the 3%increase in overall contrail coverage in 2012. The TCRFs for 2012 Aqua are similar, -6:4, 15.5, and 9.0mWm-2 for shortwave, longwave, and net radiative forcing. The strong correlation between the relative changes in both total SWCRF and LWCRF between 2006 and 2012 and the corresponding relative changes in screened contrail coverage over each air traffic region suggests that regional changes in TCRF from year to year are dominated by year-to-year changes in contrail coverage over each area. © 2019 Author(s).
语种	英语
scopus关键词	algorithm; Aqua (satellite); longwave radiation; MODIS; Northern Hemisphere; optical depth; radiative forcing; satellite imagery; shortwave radiation; Terra (satellite)
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144469
作者单位	Science Systems and Applications, Inc, Hampton, VA 23666-5986, United States; NASA Langley Research Center, Hampton, VA 23681-2199, United States
推荐引用方式 GB/T 7714	Duda D.P.,Bedka S.T.,Minnis P.,et al. Northern Hemisphere contrail properties derived from Terra and Aqua MODIS data for 2006 and 2012[J],2019,19(8).
APA	Duda D.P..,Bedka S.T..,Minnis P..,Spangenberg D..,Khlopenkov K..,...&Jr..(2019).Northern Hemisphere contrail properties derived from Terra and Aqua MODIS data for 2006 and 2012.Atmospheric Chemistry and Physics,19(8).
MLA	Duda D.P.,et al."Northern Hemisphere contrail properties derived from Terra and Aqua MODIS data for 2006 and 2012".Atmospheric Chemistry and Physics 19.8(2019).