Quantifying Impacts of Mean Annual Lake Bottom Temperature on Talik Development and Permafrost Degradation Below Expanding Thermokarst Lakes on the Qinghai-Tibet Plateau Page: 9
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Water 2019, 11, 706
Tmab 3.75C
Tmaib=4.50 C
Tmalb=5.250C
Tmab-6.000c5
10
15
20
25
30
35
40
45I I I
55 65
5 85 95 105 115
Distance from lake centerline (r25 135
145
Figure 5. The vertical profiles of the open talik below the thermokarst lakes with different mean annual
lake bottom temperatures on the last day of year 540 after the thermokarst lakes' formation.
Table 3. The minimum distances from open talik profiles to lake centerlines below the lakes with
different mean annual lake bottom temperatures at different years.
Mean Lake Bottom Temperature (0C) The Minimum Distance at Different Years (m)3.75
4.50
5.25
6.00480
31.9
50.8
62.2
71.1540
58.7
72.9
83.6
90.1600
81.3
92.5
102.4
109.8In order to fully understand the difference in open talik development processes beneath thermokarst
lakes with different MALBTs, the mean open talik lateral progress rate, Rmip, in m/year was defined asa measure index in this study:
Rmp = dmin
totc(10)
where dmin is the minimum distance from the open talik profile to the lake centerline in m, and tot, is
the time interval between the timings of the downward and upward advancing 0 'C isotherms starting
to merge related to the current time in years.
To explore the impact of variations in the MALBT on open talik development with time, Figure 6
presents the vertical profiles of the open taliks below thermokarst lakes with MALBTs of 3.75 'C, 4.5 'C,
5.25 'C, and 6.0 'C on the last day of years 45, 90, and 150 after the open taliks' formation.-o
E.
Q)
0mI I I
9 of16
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Ling, Feng & Pan, Feifei. Quantifying Impacts of Mean Annual Lake Bottom Temperature on Talik Development and Permafrost Degradation Below Expanding Thermokarst Lakes on the Qinghai-Tibet Plateau, article, April 5, 2019; [Basel, Switzerland]. (https://digital.library.unt.edu/ark:/67531/metadc1638169/m1/9/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting University of North Texas.