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Amplitude modulation of relative humidity by wind in Northeast China: the formation of variance annual cycle in relative humidity.
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- Author(s): Nian, Da; Huang, Yu; Fu, Zuntao
- Source:
Climate Dynamics; Aug2022, Vol. 59 Issue 3/4, p1133-1142, 10p- Subject Terms:
- Source:
- Additional Information
- Abstract: Relative humidity has an important impact not only on climate change and ecosystems but also on human life. The intensity of high-frequency fluctuations in surface relative humidity over Northeast China shows a predominant seasonally dependent structure, which may be closely related to regional monsoon activities. However, the factors responsible for this phenomenon remain unknown. This study defines the variance annual cycle (VAC) to describe this seasonally dependent intensity structure of high-frequency relative humidity fluctuations. Relative humidity VAC shows a high correlation with low-frequency oscillations of surface wind speed. We examine the instantaneous amplitude-phase correlation map and amplitude modulation (AM) index between surface relative humidity and surface wind speed. We find that the surface wind speed with a period around 140–420 days has a significant amplitude modulation effect on the surface relative humidity with a period of around 2–90 days over most regions in Northeast China, which reveals that the low-frequency oscillations of surface wind speed amplitude modulate on the high-frequency fluctuations of surface relative humidity. To explore the physical mechanism behind this modulation, we examine the monthly mean patterns of the surface wind and sea level pressure fields. The patterns indicate that this amplitude modulation is induced by the evolution and transition of East Asian winter monsoon and summer monsoon. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Climate Dynamics is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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