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Convective signals from surface measurements at ARM Tropical Western Pacific site Manus
Wang,Y (Wang, Yi)[1,2]; Long,CN (Long, Charles N.)[1]; Mather,JH (Mather, James H.)[1]; Liu XD (Liu, Xiaodong)[2]
2011
Source PublicationCLIMATE DYNAMICS
Volume36Issue:3-4Pages:431-449
Subtype期刊论文
Abstract

Madden-Julian Oscillation (MJO) signals have been detected using highly sampled observations from the U.S. DOE ARM Climate Research Facility located at the Tropical Western Pacific Manus site. Using downwelling shortwave radiative fluxes and derived shortwave fractional sky cover, and the statistical tools of wavelet, cross wavelet, and Fourier spectrum power, we report finding major convective signals and their phase change from surface observations spanning from 1996 to 2006. Our findings are confirmed with the satellite-gauge combined values of precipitation from the NASA Global Precipitation Climatology Project and the NOAA interpolated outgoing longwave radiation for the same location. We find that the Manus MJO signal is weakest during the strongest 1997-1998 El Nio Southern Oscillation (ENSO) year. A significant 3-5-month lead in boreal winter is identified further between Manus MJO and NOAA NINO3.4 sea surface temperature (former leads latter). A striking inverse relationship is found also between the instantaneous synoptic and intraseasonal phenomena over Manus. To further study the interaction between intraseasonal and diurnal scale variability, we composite the diurnal cycle of cloudiness for 21-MJO events that have passed over Manus. Our diurnal composite analysis of shortwave and longwave fractional sky covers indicates that during the MJO peak (strong convection), the diurnal amplitude of cloudiness is reduced substantially, while the diurnal mean cloudiness reaches the highest value and there are no significant phase changes. We argue that the increasing diurnal mean and decreasing diurnal amplitude are caused by the systematic convective cloud formation that is associated with the wet phase of the MJO, while the diurnal phase is still regulated by the well-defined solar forcing. This confirms our previous finding of the anti-phase relationship between the synoptic and intraseasonal phenomena. The detection of the MJO over the Manus site provides further opportunities in using other ground-based remote sensing instruments to investigate the vertical distributions of clouds and radiative heatings of the MJO that currently is impossible from satellite observations.

KeywordMadden–Julian Oscillation Diurnal cycle Atmospheric Radiation Measurement Cloud radiativeforcing Wavelet and cross wavelet analyses Fourier power spectra Tropical Western Pacific
DOI10.1007/s00382-009-0736-z
Indexed BySCI
Language英语
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10314
Collection古环境研究室
Corresponding AuthorWang,Y (Wang, Yi)[1,2]; Liu XD (Liu, Xiaodong)[2]
Affiliation1.Pacific Northwest National Laboratory, 902 Battelle Boulevard,Richland, WA 99354, USA;
2.SKLLQG, Institute of Earth Environment,Chinese Academy of Sciences, 710075 Xi’an, China
Recommended Citation
GB/T 7714
Wang,Y ,Long,CN ,Mather,JH ,et al. Convective signals from surface measurements at ARM Tropical Western Pacific site Manus[J]. CLIMATE DYNAMICS,2011,36(3-4):431-449.
APA Wang,Y ,Long,CN ,Mather,JH ,&Liu XD .(2011).Convective signals from surface measurements at ARM Tropical Western Pacific site Manus.CLIMATE DYNAMICS,36(3-4),431-449.
MLA Wang,Y ,et al."Convective signals from surface measurements at ARM Tropical Western Pacific site Manus".CLIMATE DYNAMICS 36.3-4(2011):431-449.
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