DOI: 10.1175/JCLI-D-13-00722.1
Scopus记录号: 2-s2.0-84903386105
论文题名: Trends in U.S. total cloud cover from a homogeneity-adjusted dataset
作者: Free M. ; Sun B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 13 起始页码: 4959
结束页码: 4969
语种: 英语
Scopus关键词: Time series
; Automated observing systems
; Change point detection
; Climate information
; Cloud cover
; National Weather Services
; North America
; Regional variability
; Trends
; Military bases
; cloud cover
; homogeneity
; regional pattern
; time series analysis
; trend analysis
; United States
英文摘要: Cloud cover data from ground-based weather observers can be an important source of climate information, but the record of such observations in the United States is disrupted by the introduction of automated observing systems and other artificial shifts that interfere with our ability to assess changes in cloudiness at climate time scales. A new dataset using 54 National Weather Service (NWS) and 101 military stations that continued to make human-augmented cloud observations after the 1990s has been adjusted using statistical changepoint detection and visual scrutiny. The adjustments substantially reduce the trends in U.S. mean total cloud cover while increasing the agreement between the cloud cover time series and those of physically related climate variables. For 1949-2009, the adjusted time series give a trend in U.S. mean total cloud of 0.11% ± 0.22% decade-1 for the military data, 0.55% ± 0.24% decade-1 for the NWS data, and 0.31% ± 0.22% decade-1 for the combined dataset. These trends are less than one-half of those in the original data. For 1976-2004, the original data give a significant increase but the adjusted data show an insignificant trend from -0.17% decade-1 (military stations) to 0.66% decade-1 (NWS stations). Trends have notable regional variability, with the northwest United States showing declining total cloud cover for all time periods examined, while trends for most other regions are positive. Differences between trends in the adjusted datasets from military stations and NWS stations may be rooted in the difference in data source and reflect the uncertainties in the homogeneity adjustment process. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51053
Appears in Collections: 气候变化事实与影响
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作者单位: NOAA, Air Resources Laboratory, College Park, MD, United States; NOAA/NESDIS, Center for Satellite Applications and Research, I. M. Systems Group, Rockville, MD, United States
Recommended Citation:
Free M.,Sun B.. Trends in U.S. total cloud cover from a homogeneity-adjusted dataset[J]. Journal of Climate,2014-01-01,27(13)