https://scholars.lib.ntu.edu.tw/handle/123456789/403564
標題: | Radiative and precipitation controls on root zone soil moisture spectra | 作者: | TARO NAKAI Katul, Gabriel G. Kotani, Ayumi Igarashi, Yasunori Ohta, Takeshi Suzuki, Masakazu Kumagai, Tomo'omi |
公開日期: | 2014 | 出版社: | AMER GEOPHYSICAL UNION | 來源出版物: | Geophysical Research Letters | 摘要: | ©2014. American Geophysical Union. All Rights Reserved. Temporal variability in root zone soil moisture content (w) exhibits a Lorentzian spectrum with memory dictated by a damping term when forced with white-noise precipitation. In the context of regional dimming, radiation and precipitation variability are needed to reproduce w trends prompting interest in how the w memory is altered by radiative forcing. A hierarchy of models that sequentially introduce the spectrum of precipitation, net radiation, and the effect of w on evaporative and drainage losses was used to analyze the spectrum of w at subtropical and temperate forested sites. Reproducing the w spectra at long time scales necessitated simultaneous precipitation and net radiation measurements depending on site conditions. The w memory inferred from observed w spectra was 25-38 days, larger than that determined from maximum wet evapotranspiration and field capacity. The w memory can be reasonably inferred from the Lorentzian spectrum when precipitation and evapotranspiration are in phase. Key PointsClimate models predict Lorentzian temporal spectra for root zone soil moisture wLong-term site measurements deviate from Lorentzian and report shorter w memoryPrecipitation and net radiation impact w spectra and its memory at long scales |
URI: | http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000345518300018&KeyUID=WOS:000345518300018 https://scholars.lib.ntu.edu.tw/handle/123456789/403564 |
ISSN: | 00948276 | DOI: | 10.1002/2014GL061745 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000345518300018&KeyUID=WOS:000345518300018 15943619 |
顯示於: | 森林環境暨資源學系 |
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