Factors Related to the Interannual Variations of Spring Surface Winds over the Pastoral Transitional Zone in Northern China

Yihong HU; Daoyi GONG; Rui MAO; Jing YANG; Xiaoxue SHI

doi:10.7522/j.issn.1000-0534.2019.00046.

2020 , Vol. 39 >Issue 3: 651 - 661

DOI: https://doi.org/10.7522/j.issn.1000-0534.2019.00046.

Factors Related to the Interannual Variations of Spring Surface Winds over the Pastoral Transitional Zone in Northern China

Yihong HU ,
Daoyi GONG ,
Rui MAO ,
Jing YANG ,
Xiaoxue SHI

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1.Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Beijing Normal University, Beijing 100875, China;2.Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China;3.Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

Received date: 2018-12-18

Online published: 2020-06-28

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Abstract

The possible influence of the atmospheric circulation and the land surface factors on interannual variation of wind speed over pastoral transitional zone in northern China in spring has been investigated, by employing daily wind speed observations for 15 meteorological stations, the ERA-Interim reanalysis data, and the GLASS leaf area index data.The results show that, in addition to a weakening trend (-0.10 m·s^-1 per decade), the spring wind also experiments strong year-to-year variations.During the period of 1979 -2016, the interannual components accounts for 58% of the total variance.The wind interannual variability is strongly related to the anomalous cyclonic circulation in northeastern Asia.It strength, as being measured as the mean 700 hPa heights over 46°N -55°N and 116°E -130°E, has a significant correlation (-0.83) with the surface wind of the study area.When the anomalous cyclonic circulation is strengthened, there is an anomalous northwesterly wind over pastoral transitional zone, which subsequently results in stronger winds.Interannual changes of the anomalous cyclonic circulation is related to the planetary atmospheric circulation over the northern hemisphere, as demonstrated by its significant correlation with the Arctic Oscillation (r=0.41).Surface roughness is an important aerodynamic parameter with respect to the near surface vertical wind transport.Observations show that the leaf area index changes out-of-phase with wind speed.Annual scatter diagram shows that when the leaf area index increases 1 unit, the wind speed tends to decrease by approximate 1.57 m·s^-1.Their interannual variations from 1982 -2014 yield a significant correlation of -0.61.There is also a negative correlation between NDVI and wind speed, but the correlation is not significant.It is probably because the leaf area index can better reflect the long-term variation of aerodynamic properties.The change of land surface physical conditions may also affect winds through the land-air heat flux.Analysis show that the interannual variations of surface wind are significantly related to the boundary layer height (r=0.57), sensible heat flux (r=0.39), and latent heat flux (r=-0.39).If only days with smaller wind speed (≤3 m·s^-1) are considered, their relationship becomes more evident (r=0.59, 0.60 and -0.57, respectively).

Key words： Pastoral transitiona; wind speed; interannual variatio; atmospheric circulat; land use and cover c

Cite this article

Yihong HU , Daoyi GONG , Rui MAO , Jing YANG , Xiaoxue SHI . Factors Related to the Interannual Variations of Spring Surface Winds over the Pastoral Transitional Zone in Northern China[J]. Plateau Meteorology, 2020 , 39(3) : 651 -661 . DOI: 10.7522/j.issn.1000-0534.2019.00046.

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