Processes and modes of permafrost degradation on the Qinghai-Tibet Plateau

Wu, Jichun; Sheng, Yu; Wu, Qingbai; Wen, Zhi

doi:10.1007/s11430-009-0198-5

Cited by 48 publications

(42 citation statements)

References 25 publications

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“…Geographically, spatial patterns of permafrost temperature distribution on the QTP are controlled by regional zonations of elevation, latitude, and continentality (Cheng, 1983;Zhou et al, 2000;Jin et al, 2008;Wu et al, 2010b) and are significantly affected by local environmental factors such as vegetation, snow cover, soil water content. and geological landform (Cheng, 2003;Wang et al, 2002;Jin et al, 2008;Lu et al, 2008;Pang et al, 2011).…”

Section: Permafrost Thermal State and Thermal Profilesmentioning

confidence: 99%

“…and geological landform (Cheng, 2003;Wang et al, 2002;Jin et al, 2008;Lu et al, 2008;Pang et al, 2011). Recently, the main characteristics of permafrost conditions, the recent permafrost warming, and the changes in the active layer were discussed in detail by Cheng and Wu (2007), Zhang (2008, 2010), Wu et al (2010aWu et al ( , 2010b, Zhao et al (2010), and Xie et al (2012). Therefore, in this study, we only focus on the characteristics of the thermal profiles at these monitoring sites.…”

Section: Permafrost Thermal State and Thermal Profilesmentioning

confidence: 99%

“…At QTB5, the DZAA is 7.7 m and it is less than the ALT at this site (8.3 m). Permafrost has been rapidly disappearing in this region for the past several decades (Wu et al, 2010b).…”

Section: Permafrost Thermal State and The Dzaamentioning

confidence: 99%

See 2 more Smart Citations

Temperature-Dependent Adjustments of the Permafrost Thermal Profiles on the Qinghai-Tibet Plateau, China

Xie

Gough

Zhao

et al. 2015

Arctic, Antarctic, and Alpine Research

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Section: Permafrost Thermal State and Thermal Profilesmentioning

confidence: 99%

Section: Permafrost Thermal State and Thermal Profilesmentioning

confidence: 99%

See 1 more Smart Citation

Temperature-Dependent Adjustments of the Permafrost Thermal Profiles on the Qinghai-Tibet Plateau, China

Xie

Gough

Zhao

et al. 2015

Arctic, Antarctic, and Alpine Research

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“…Ground temperature profile during permafrost degradation in linearly rising temperature mode on the Qinghai–Tibetan Plateau (modified from Wu et al, )…”

Section: Discussionmentioning

confidence: 99%

Response of low flows under climate warming in high‐altitude permafrost regions in western China

Wang

Chen

et al. 2018

Hydrological Processes

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The increase in low flows (winter discharge and minimum monthly discharge), caused primarily by permafrost degradation, is common in high‐latitude permafrost regions, whereas the dynamics of low flows in high‐altitude permafrost regions remain largely unknown. Long‐term discharge data from 28 unregulated catchments in western China were analysed, and the findings showed that winter discharge/minimum monthly discharge significantly increased (p ≤ 0.1) in 82/82%, 55/64%, and 0/0% of the catchments in the higher‐latitude mountain permafrost regions (Tienshan Mountains), mid‐latitude mountain permafrost regions (Qilian Mountains), and mid‐ to low‐latitude plateau permafrost regions (the source regions of the Yangtze and Yellow rivers), respectively. The differences in permafrost type and the distribution of permafrost and alpine cold desert (which is similar to tundra) were found to be the main causes for the different responses in the low flows. The rate of change of low flows (winter discharge and minimum monthly discharge) was negatively and linearly correlated with permafrost coverage when coverage was less than 40% of the catchment area, whereas the low flows changed only slightly when the permafrost coverage exceeded 40%. A significant thickening of the active layer increased the low flows in the lower permafrost‐covered catchments, which are dominated by warm permafrost. However, in the higher permafrost‐covered catchments with cold permafrost and a cold climate, only an increase in permafrost temperature (without a notable thickening of the active layer) occurred, resulting in non‐significant changes in low flows.

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“…Figure 3A in (1) is a speculation. (1), there were seven sets of dating data on the Jishi Gorge dammed lake in the literature (2,(10)(11)(12)(13)(14)(15). With the exception of (2), all others dated the lake between 10,500 and 3400 BCE, with both 14 C and optically stimulated luminescence (OSL) methods (the calendar year for radiocarbon dating is calculated using the Oxcal program with a 95.4% confidence level).…”

mentioning

confidence: 99%

Comment on “Outburst flood at 1920 BCE supports historicity of China’s Great Flood and the Xia dynasty”

Han

2017

Science

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By analyzing the data and methodology of Wu et al. (Reports, 5 August 2016, p. 579), I find that their conclusions about the scale of the dammed lake, the dating of the lake, and the peak discharge at the point of dam failure and at the Lajia site cannot be validated. The conjecture of the supposed Great Flood and its impact on the formation of the early Chinese dynasty is not substantiated. Fig. 1B.) Their dating of the dammed lake is also problematic. The 14 C dating samples in (1) were collected above the lacustrine sediment layer [figure S1 in (1)], which would only be formed hundreds of years after the high dam failed, according to the scenario described in (1). Using these samples to date the time of the supposed high dam failure is a contradiction. In addition, dating data from six other studies contradict the results of Wu et al. These data show that the dammed lake was not coeval with the Lajia disaster (see Table 1).As for the peak discharge at dam failure, table S3 in (1) ] should be used instead. Even though the modified equations might in theory be appropriate, in reality they produce a larger error. Table 2 shows the standard error and percentage of standard error calculated using the data in (3). The original equations are more accurate in predicting peak discharge and therefore should be employed. (5) has specifically recommended the use of Q = 0.0158 (PE) 0.41 for landslide dams. The sixth equation is for flow through a box culvert, not related to dam failure flow whatsoever. Wu et al.

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Processes and modes of permafrost degradation on the Qinghai-Tibet Plateau

Cited by 48 publications

References 25 publications

Temperature-Dependent Adjustments of the Permafrost Thermal Profiles on the Qinghai-Tibet Plateau, China

Temperature-Dependent Adjustments of the Permafrost Thermal Profiles on the Qinghai-Tibet Plateau, China

Response of low flows under climate warming in high‐altitude permafrost regions in western China

Comment on “Outburst flood at 1920 BCE supports historicity of China’s Great Flood and the Xia dynasty”

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