DOI: 10.1029/2012JD018551
论文题名: Variability of the surface radiation budget over the United States from 1996 through 2011 from high-quality measurements
作者: Augustine J.A. ; Dutton E.G.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 1 起始页码: 43
结束页码: 53
语种: 英语
英文关键词: climate change
; surface radiation budget
Scopus关键词: Carbon dioxide
; Climate change
; Interfacial energy
; Moisture
; High-quality measurements
; Interannual variability
; Interannual variation
; Natural variability
; Specific humidity
; Surface energy fluxes
; Surface radiation budget
; Temperature trends
; Radiation
; climate change
; cloud cover
; decadal variation
; El Nino-Southern Oscillation
; energy flux
; radiation budget
; signal
; spatiotemporal analysis
; United States
英文摘要: Sixteen years of high-quality surface radiation budget (SRB) measurements over seven U.S. stations are summarized. The network average total surface net radiation increases by +8.2 Wm-2 per decade from 1996 to 2011. A significant upward trend in downwelling shortwave (SW-down) of +6.6 Wm -2 per decade dominates the total surface net radiation signal. This SW brightening is attributed to a decrease in cloud coverage, and aerosols have only a minor effect. Increasing downwelling longwave (LW-down) of +1.5 Wm -2 per decade and decreasing upwelling LW (LW-up) of -0.9 Wm -2 per decade produce a +2.3 Wm-2 per decade increase in surface net-LW, which dwarfs the expected contribution to LW-down from the 30 ppm increase of CO2 during the analysis period. The dramatic surface net radiation excess should have stimulated surface energy fluxes, but, oddly, the temperature trend is flat, and specific humidity decreases. The enigmatic nature of LW-down, temperature, and moisture may be a chaotic result of their large interannual variations. Interannual variation of the El Niño/Southern Oscillation (ENSO) ONI index is shown to be moderately correlated with temperature, moisture, and LW-down. Thus, circulations associated with ENSO events may be responsible for manipulating (e.g., by advection or convection) the excess surface energy available from the SRB increase. It is clear that continued monitoring is necessary to separate the SRB's response to long-term climate processes from natural variability and that collocated surface energy flux measurements at the SRB stations would be beneficial. Key Points The SRB over the U.S. increased by 8.2 Wm-2 per decade from 1996 to 2011 The increase in U.S. SRB from 1996 to 2011 was dominated by solar brightening Interannual variability of SRB components masks long-term climate signals. © 2012 American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63975
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: NOAA Earth System Research Laboratory, Global Monitoring Division, Broadway, Boulder, CO, United States
Recommended Citation:
Augustine J.A.,Dutton E.G.. Variability of the surface radiation budget over the United States from 1996 through 2011 from high-quality measurements[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(1)