Abstract
Freezing and thawing indices are not only of great significance for permafrost research but also are important indicators of the effects of climate change. However, to date, research on ground-surface freezing and thawing indices and their relationship with air indices is limited. Based on daily air and ground-surface temperatures collected from 11 meteorological stations in the source region of the Yellow River, the freezing and thawing indices were calculated, and their spatial distribution and trends were analyzed. The air-freezing index (AFI), air-thawing index (ATI), ground surface-freezing index (GFI), ground surface-thawing index (GTI), air thawing-freezing index ratio (Na) and surface ground thawing-freezing index ratio (Ng) were 1554.64, 1153.93, 1.55, 2484.85, 850.57 °C-days and 3.44, respectively. Altitude affected the spatial distribution of the freezing and thawing indices. As the altitude increased, the freezing indices gradually increased, and the thawing indices and thawing-freezing index ratio decreased. From 1980 to 2014, the AFI and GFI decreased at rates of 8.61 and 11.06 °C-days a−1, the ATI and GTI increased at 9.65 and 14.53 °C-days a−1, and Na and Ng significantly increased at 0.21 and 0.79 decade−1. Changes in the freezing and thawing indices were associated with increases in the air and ground-surface temperatures. The rates of change of the ground surface freezing and thawing indices were faster than the air ones because the rate of increase of the ground-surface temperature was faster than that of the air and the difference between the ground surface and air increased. The change point of the time series of freezing and thawing indices occurred in 2000–2001. After 2000–2001, the AFI and GFI were lower than before the change point, and the changing trend was lower. The ATI, GTI, Na and Ng during 2001–2014 were higher, with faster rates than before. In addition, the annual thawing indices composed a greater proportion of the mean annual air temperature and mean annual ground surface temperature than the annual freezing indices. This study provides the necessary basis for research on and prediction of permafrost changes, especially changes in the depth of the active permafrost layer, climate change, and possible evolution of the ecological environment over the source region of the Yellow River on the Qinghai-Tibet Plateau.
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References
Anisimov OA, Lobanov VA, Reneva SA, Shiklomanov NI, Zhang T, Nelson FE (2007) Uncertainties in gridded air temperature fields and effects on predictive active layer modeling. J Geophys Res Earth Surf 112(F2):261–263
Boyd DW (1976) Normal freezing and thawing degree-days from normal monthly temperatures. Can Geotech J 13(2):176–180
Brown J, Hinkel KM, Nelson FE (2000) The circumpolar active layer monitoring (CALM) program: research designs and initial results 1. Polar Geogr 24(3):166–258
Cao B, Zhang TJ, Peng XQ (2015) Spatial variability of freezing-thawing index over the Heihe River Basin. Adv Earth Sci 30(3):357–366 (Chinese)
Cheng GD, Jiang H, Wang KL, Wu QB (2003) Thawing index and freezing index on the Embankment surface in permafrost regions. J Glaciol Geocryol 17(3):669–676 (Chinese)
Frauenfeld OW, Zhang T, Mccreight JL (2007) Northern hemisphere freezing/thawing index variations over the twentieth century. Int J Climatol 27(1):47–63
Guo D, Yang M, Wang H (2011) Sensible and latent heat flux response to diurnal variation in soil surface temperature and moisture under different freeze/thaw soil conditions in the seasonal frozen soil region of the central Tibetan Plateau. Environ Earth Sci 63(1):97–107
Han CH, Hao ZX, Zheng JY (2013) Regionalization of temperature changes in China and characteristics of temperature in different regions during 1951–2010. Prog Geogr 32(6):887–896 (Chinese with English abstract)
Hartman CW, Johnson PR (1984) Environmental atlas of Alaska. University of Washington Press, Washington, p 95
Jiang F, Hu R, Li Z (2008) Variations and trends of the freezing and thawing index along the Qinghai-Xizang railway for 1966–2004. J Geogr Sci 18(1):3–16
Jiang F, Jilili A, Wang S, Hu R, Li X (2015) Annual thawing and freezing indices changes in the China Tianshan Mountains. Reg Environ Change 15(2):227–240
Jin HJ, He RX, Cheng GD, Wu Q, Wang S, Lü L, Chang X (2009) Changes in frozen ground in the source area of the Yellow River on the Qinghai-Tibet Plateau, China, and their eco-environmental impacts. Environ Res Lett 4(4):549–567
Kang S, Xu Y, You Q, Flügel W, Pepin N, Yao T (2010) Review of climate and cryospheric change in the Tibetan Plateau. Environ Res Lett 5(1):75–82
Kendall MG (1975) Rank correlation measures. Charles Griffin, London, p 202
Lan YC, Lu CY, La CF, Shen YP, Jin HJ, Song J, Wen J, Liu JP (2013) The fact of climate shift to warm-humid in the source regions of the Yellow River and its hydrologic response. J Glaciol Geocryol 35(4):920–928 (Chinese)
Li SD, Cheng GD (1996) Map of frozen ground on Qinghai -Xizang plateau. Gansu Culture Press, Lanzhou (Chinese)
Li X, Jin R, Pan X, Zhang T, Guo J (2012) Changes in the near-surface soil freeze–thaw cycle on the Qinghai-Tibetan Plateau. Int J Appl Earth Obs Geoinf 17(1):33–42
Li KM, Li X, Wang CY, Qiao YJ (2013) Research on the environmental effect caused by climate change in the source region of the Yellow River. J Glaciol Geocryol 35(5):1183–1192 (Chinese)
Luo DL, Jin HJ, Lin L, He RX, Yang SZ, Chang XL (2012) New progress on permafrost temperature and thickness in the source area of the Huanghe River. Scientia Geographica Sinica 32:898–904 (Chinese with English abstract)
Luo DL, Jin HJ, Jin R, Yang X, Lü L (2014) Spatiotemporal variations of climate warming in northern Northeast China as indicated by freezing and thawing indices. Quatern Int 349:187–195
Mann HB (1945) Nonparametric tests against trend. Econometrica 13(3):245–259
Qin D, Stocker T (2014) Highlights of the IPCC Working Group I fifth assessment report. Progressus Inquisitiones de Mutatione Climatis 10(1):1–6 (Chinese)
Schaefer K, Lantuit H, Romanovsky VE, Schuur EAG, Witt R (2014) The impact of the permafrost carbon feedback on global climate. Environ Res Lett 9(8):085003
Steurer PM (1996) Probability distributions used in 100-year return period of air-freezing index. J Cold Reg Eng 10(1):25–35
Tian HL, Lan YC, Wen J, Jin H, Wang C, Wang X, Kang Y (2015) Evidence for a recent warming and wetting in the source area of the Yellow River (SAYR) and its hydrological impacts. J Geogr Sci 25(6):643–668 (Chinese with English Abstract)
Wang B, Bao Q, Hoskins B, Wu G, Liu Y (2008) Tibetan Plateau warming and precipitation changes in East Asia. Geophys Res Lett 35(14):63–72
Wang YL, Wang X, Li CH, Wu F, Yang Z (2015) Spatiotemporal analysis of temperature trends under climate change in the source region of the Yellow River, China. Theor Appl Climatol 119(1–2):123–133
Wu Q, Zhang T (2010) Changes in active layer thickness over the Qinghai-Tibetan Plateau from 1995 to 2007. J Geophys Res Atmos 115(D9):736–744
Wu T, Wang Q, Zhao L, Batkhishig O, Wantanabe M (2010) Observed trends in surface freezing/thawing index over the period 1987–2005 in Mongolia. Cold Reg Sci Technol 69(1):105–111
Wu T, Zhao L, Li R, Wang Q, Xie C, Pang Q (2013) Recent ground surface warming and its effects on permafrost on the central Qinghai-Tibet Plateau. Int J Climatol 33(4):920–930
Yang M, Nelson FE, Shiklomanov NI, Guo D, Wan G (2010) Permafrost degradation and its environmental effects on the Tibetan Plateau: a review of recent research. Earth Sci Rev 103(1–2):31–44
Zhang Z, Wu Q (2012) Thermal hazards zonation and permafrost change over the Qinghai-Tibet Plateau. Nat Hazards 61(2):403–423
Zhang SQ, Wang YG, Zhao YZ, Huang Y, Li YG, Shi WD, Shang XG (2004) Permafrost degradation and its environmental sequent in the source regions of the Yellow River. J Glaciol Geocryol 26(1):1–6 (Chinese with English abstract)
Zhang T, Frauenfeld OW, McCreight JL, Barry RG (2005) Northern hemisphere EASE-Grid annual freezing and thawing indices, 1901–2002. National snow and ice data center/World Data Center for glaciology. Boulder, CO: Digital Media, [cited 2008 October 17. http://scientificjournals.org/journals2009/articles/1424.pdf.2005
Zhang JG, Wang YL, Ji YS, Yan D (2011) Melting and shrinkage of cryosphere in Tibet and its impact on the ecological environment. J Arid Land 3(4):292–299
Zhao HY, Jiang H, Wang KL, Yang YF (2008) The surface thawing-freezing indexes along the Qinghai-Tibet railway: analysis and calculation. J Glaciol Geocryol 30:617–622 (Chinese with English abstract)
Acknowledgements
The daily air and ground-surface temperature data were provided by the Chinese meteorological science data-sharing service. The permafrost distribution map in Fig. 1 was provided by the Cold and Arid Regions Science Data Center in Lanzhou.
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Project funding: This study was funded by the National Science and Technology Support Plan (2015BAD07B02).
The online version is available at http://www.springerlink.com
Corresponding editor: Hu Yanbo.
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Wang, R., Zhu, Q. & Ma, H. Changes in freezing and thawing indices over the source region of the Yellow River from 1980 to 2014. J. For. Res. 30, 257–268 (2019). https://doi.org/10.1007/s11676-017-0589-y
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DOI: https://doi.org/10.1007/s11676-017-0589-y