DOI: 10.1002/joc.5692
论文题名: Factors controlling evaporation and the CO 2 flux over an open water lake in southwest of China on multiple temporal scales
作者: Du Q. ; Liu H.Z. ; Liu Y. ; Wang L. ; Xu L.J. ; Sun J.H. ; Xu A.L.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 13 起始页码: 4723
结束页码: 4739
语种: 英语
英文关键词: CO 2 flux
; evaporation
; lake
; latent heat flux
; sensible heat flux
Scopus关键词: Budget control
; Carbon dioxide
; Evaporation
; Lakes
; Latent heat
; Wind
; Annual precipitation
; CO2 fluxes
; Continuous measurements
; Photosynthetic active radiations
; Seasonal variation
; Sensible heat flux
; Temperature differences
; Total precipitation
; Heat flux
; carbon dioxide
; carbon monoxide
; evaporation
; flux measurement
; lake water
; latent heat flux
; open water
; sensible heat flux
; temporal analysis
; turbulent flow
; China
; Erhai Lake
; Yunnan
英文摘要: Interactions between lakes and the atmosphere are poorly understood, especially for lakes in highland areas. A better understanding of the physical processes controlling turbulent exchange dynamics over lakes is crucial to improve the numerical modelling of the lake–climate interaction. Four years of continuous measurements of energy and CO 2 fluxes are conducted over a shallow highland lake (Lake Erhai) in China using eddy covariance (EC) technique from 2012 to 2015. It is found that the latent heat flux (LE) and sensible heat flux (H) has distinct diurnal and seasonal variations. The diurnal H and LE ranges from −31 to 21 W/m 2 and from 31 to 171 W/m 2 , respectively. The heat is stored in the lake from January to June and released from July to the end of the year. The annual total evaporation of Lake Erhai varies from 1120.8 to 1228.5 mm/a, which is always higher than the annual total precipitation. On diurnal scale, the CO 2 uptake is observed during most of the midday period. On an annual scale, the Lake Erhai behaves as a net CO 2 source, with an annual CO 2 budget ranging from 117.5 to 161.7 g C m −2 a −1 . The temperature difference (ΔT) between the water surface (T s ) and the air temperature (T a ), and the product of ΔT and wind speed (U) are the major drivers of H from half-hourly to monthly scale. The main factors controlling LE are U and the product of U and the vapour pressure difference (VPD) on half-hourly and daily scales, the total cloud cover, and net radiation (R n ) on the monthly scale. Photosynthetic active radiation (PAR) and U has a close relationship with half-hourly and daily CO 2 fluxes, respectively, while annual precipitation and T s has a larger effect on annual CO 2 fluxes. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116745
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Yunnan Meteorological Observatory, Kunming, China; Dali National Climatic Observatory, Dali, China
Recommended Citation:
Du Q.,Liu H.Z.,Liu Y.,et al. Factors controlling evaporation and the CO 2 flux over an open water lake in southwest of China on multiple temporal scales[J]. International Journal of Climatology,2018-01-01,38(13)