Climate Characteristics of Surface Heating Fields in Arid Region of Northwest China in Summer

WANG Hao;LI Dongliang;WANG Hui

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Plateau Meteorology
Plateau Meteorology ›› 2016, Vol. 35 ›› Issue (2) : 363-374. DOI: 10.7522/j.issn.1000-0534.2015.00032

Climate Characteristics of Surface Heating Fields in Arid Region of Northwest China in Summer

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Abstract

The monthly surface heating fields in the arid region of Northwest China in summer from 1982 to 2012 were calculated with the satellite remote sensing data of AVHRR/NDVI, MODIS/NDVI and the observed date from 95 meteorological stations in Northwest China. By comparing with 3 sets of reanalysis data, and using mathematical statistics and empirical orthogonal function (EOF) methods, the spatial distributions and temporal variations of the surface heating fields are analyzed. The main conclusions are as follows:(1) The large values of surface heating fields in the arid region of Northwest China in summer are mainly over the Alxa Plateau, Qaidam Basin and regions to its north, eastern Qinghai and east of Hexi Corridor area. (2) The calculated values of surface heating fields are generally smaller than those from three reanalysis data, but all of them have the same magnitude. The ERA-40 reanalysis data and the calculated value of surface heating fields are consistent in both spatial distribution pattern and interannual variations, while the calculated values of surface heating fields give more detailed information of the local climate characteristics. (3) The LV1 of surface heating fields in the arid region of Northwest China in summer have opposite spatial patterns from east to west, and its PC1 displays changing interannual trends of surface heating fields in the arid region of Northwest China in summer around 1995. The LV2 have opposite spatial patterns from northeast to southwest. Furthermore, its PC2 indicates that the surface heating fields in northeastern (southwestern) part of Northwest China increases (decreases) year by year before the mid-1990s, and there is no obvious interannual trends afterwards with a slightly larger (smaller) value. (3) Taking 100°E as the boundary, the surface heating fields in the eastern and western parts of Northwest China vary significantly in terms of intra-annual and interannual variation trends. The intensity of the surface heating fields in eastern regions is stronger than that in western regions. The month of the peak surface heating fields in the east (July) is later than it in the west (June). The summer surface heating fields in western and eastern have opposite interannual variations and the interannual variations of surface heating fields in eastern (western) is dominated by the sensible heat flux (latent heat flux), which varies from weak(strong) to strong (weak) from 1982-1995 and strong (weak) to weak (strong) from 1995-2012.

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Arid region of North / Surface heating fiel / NDVI

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WANG Hao , LI Dongliang , WANG Hui. Climate Characteristics of Surface Heating Fields in Arid Region of Northwest China in Summer. Plateau Meteorology. 2016, 35(2): 363-374 https://doi.org/10.7522/j.issn.1000-0534.2015.00032

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