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- Title
Spatiotemporal variations of freezing and thawing index in northern Northeast China.
- Authors
Huang, Yadong; Jin, Huijun
- Abstract
Northern Northeast (NNE) China is the second largest permafrost region in China, onlysecond to Qinghai-Tibet Plateau. The permafrost in NNE China presents high temperatureand thin thickness, and the degradation is being accelerated due to climate warming andanthropogenic activities. The mean annual air temperature (MAAT), mean annualground surface temperature (MAGST), annual air freezing index (AFI), annualground surface freezing index (GFI), annual air thawing index (ATI) and annualground surface thawing index (GTI) in NNE China were calculated based on groundsurface and air temperatures of 27 selected stations. The results indicated that theMAAT and MAGST were higher compared to decades ago, averaged 1.74 ∘ and0.43∘, with an increasing rate of 0.568 and 0.643 ∘/10a, respectively. The AFI,GFI, ATI and GTI ranges were 1757∼3619∘⋅d, 1685∼3925∘⋅d, 1896∼3288∘⋅d and2426∼3869∘⋅d, respectively, and the multiyear average were 2502∘⋅d, 2602∘⋅d,2662∘⋅d and 3238∘⋅d, respectively. AFI and GFI exhibited decreasing trend andthe rate were 117.6∘⋅ d/10a and 111∘⋅ d/10a. However, thawing index exhibitedincreasing trend and the liner tendency of ATI/GTI were 89.5 ∘⋅ d/10a and 111 ∘⋅ d/10a.The strong liner relationship between MAAT and freezing and thawing index werealso observed. The results will help us better comprehend the temporal and spatialvariation of NNE permafrost and provide scientific basis for permafrost forecast.
- Subjects
CHINA; THAWING; ATMOSPHERIC temperature; SURFACE temperature; PERMAFROST; AIR bases
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article