Chen Jinlei, Wen Jun, Liu Rong, et al. Variation characteristics of soil temperature & moisture and air parameters in the source region of the Yellow River. J Appl Meteor Sci, 2017, 28(1): 98-108. DOI:  10.11898/1001-7313.20170109.
Citation: Chen Jinlei, Wen Jun, Liu Rong, et al. Variation characteristics of soil temperature & moisture and air parameters in the source region of the Yellow River. J Appl Meteor Sci, 2017, 28(1): 98-108. DOI:  10.11898/1001-7313.20170109.

Variation Characteristics of Soil Temperature & Moisture and Air Parameters in the Source Region of the Yellow River

DOI: 10.11898/1001-7313.20170109
  • Received Date: 2016-08-17
  • Rev Recd Date: 2016-01-13
  • Publish Date: 2017-01-31
  • The source region of the Yellow River (SRYR) located in the northeast of the Tibetan Plateau, is the crucial water conservation area. Soil temperature & moisture variations and associated climate effects have important implications to the change of runoff. Three kinds of frequently used reanalysis datasets, ERA-Interim, CFSR, and JRA-55 are tested using field observations of Maqu Soil Temperature & Moisture Network so as to find the optimal one for SRYR. Combining with observations of Maqu Station, the climate changes in recent 35 years and the temporal variation of soil moisture & temperature are analyzed. In addition, their spatial variations are depicted by reanalysis datasets and CLM4.5(Community Land Model 4.5). Main results are as follows.CFSR is the best dataset to depict the soil moisture variation, and ERA-Interim is better on soil temperature, while JRA-55 is unsuited. Soil temperature has an indication to the climate change, but its response is less significant than air temperature. Soil moisture has an increasing trend, because freezing time becomes shorter and melting time is extending. Air temperature, soil temperature & moisture, except for precipitation, have abruptions in the last 35 years. Air temperature starts to abrupt during 1997-2000, after that it shows significant upward trend. Precipitation decreases from 1987 to 2004 and increases after 2005. Abrupt change of soil temperature takes place during 1985-1986, and beyond the belief line after 1994 with prominent rising. It means soil temperature is more sensitive than air temperature to climate warming. Soil moisture has an upward abruption in 2002. Soil temperature & moisture in 10 cm depth become warm and dry in recent years. Lakes and the Yellow River are the cold and wet centers in warm season, and turn warm and dry in cold season. CLM4.5 has high simulation accuracy, and is capable of describing detailed changes of soil in SRYR. All in all, it is better than reanalysis dataset in simulating the spatial variation of soil temperature & moisture, but still has a long way comparing with observations.
  • Fig. 1  The variation of soil temperature & moisture from Jul 2008 to Jun 2009 in the source region of the Yellow River (SRYR) (a) variation of soil moisture, (b) variation of soil temperature

    Fig. 2  The interannual variation and tendency of air temperature, precipitation, soil temperature & moisture during 1980-2014 in Maqu Station of SRYR (a) air temperature, (b) precipitation, (c) soil temperature, (d) soil moisture

    Fig. 3  M-K test and sliding T test curves of air temperature, precipitation, soil temperature & moisture in recent 35 years in SRYR (a) M-K test for air temperature, (b) M-K test for precipitation, (c) M-K test for soil temperature, (d) M-K test for soil moisture, (e) sliding T test for air temperature, (f) sliding T test for precipitation, (g) sliding T test for soil temperature, (h) sliding T test for soil moisture

    Fig. 4  Recent variation of soil moisture and soil temperature in cold season, warm season and monsoon season in SRYR (a) variation of soil moisture in cold season, (b) variation of soil moisture in warm season, (c) variation of soil moisture in monsoon season, (d) variation of soil temperature in cold season, (e) variation of soil temperature in warm season, (f) variation of soil temperature in monsoon season

    Fig. 5  The spatial distribution of soil temperature & moisture in warm season and cold season during 2006-2010 in SRYR (a) soil moisture of CFSR in warm season, (b) soil moisture of CLM4.5 simulation in warm season, (c) soil moisture of CFSR in cold season, (d) soil moisture of CLM4.5 simulation in cold season, (e) soil temperature of ERA-Interim in warm season, (f) soil temperature of CLM4.5 simulation in warm season, (g) soil temperature of ERA-Interim in cold season, (h) soil temperture of CLM4.5 simulation in cold season

    Table  1  Sites of Maqu Soil Temperature & Moisture Network

    站点 纬度 经度 海拔高度/m
    CST-01 33°53′N 102°08′E 3491
    CST-02 33°40′N 102°08′E 3449
    CST-03 33°54′N 101°58′E 3508
    CST-04 33°46′N 102°43′E 3505
    CST-05 33°40′N 101°53′E 3542
    NST-06 34°00′N 102°16′E 3428
    NST-07 33°59′N 102°21′E 3430
    NST-08 33°58′N 102°36′E 3473
    NST-09 33°54′N 102°33′E 3434
    NST-10 33°52′N 102°34′E 3512
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    • Received : 2016-08-17
    • Accepted : 2016-01-13
    • Published : 2017-01-31

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