Contrasting Soil Thermal Regimes in the Forest-Tundra Transition Near Nadym, West Siberia, Russia

Матышак, Г. В.; Goncharova, O. Yu.; Москаленко, Н. Г.; Walker, Donald A.; Epstein, Howard E.; Shur, Y.

doi:10.1002/ppp.1882

Cited by 19 publications

(15 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Smith and Riseborough 2002). The insulation effect of snow on annual T S is at least twice that of the shading and cooling effects of vegetation in summer (Matyshak et al 2015). When snow cover is thin or absent in winter, the annual mean dT SA can be very small (Lacelle et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Impacts of snow on soil temperature observed across the circumpolar north

Sherstiukov

Qian

Kokelj

et al. 2018

Environ. Res. Lett.

View full text Add to dashboard Cite

Climate warming has significant impacts on permafrost, infrastructure and soil organic carbon at the northern high latitudes. These impacts are mainly driven by changes in soil temperature (T S ). Snow insulation can cause significant differences between T S and air temperature (T A ), and our understanding about this effect through space and time is currently limited. In this study, we compiled soil and air temperature observations (measured at about 0.2 m depth and 2 m height, respectively) at 588 sites from climate stations and boreholes across the northern high latitudes. Analysis of this circumpolar dataset demonstrates the large offset between mean T S and T A in the low arctic and northern boreal regions. The offset decreases both northward and southward due to changes in snow conditions. Correlation analysis shows that the coupling between annual T S and T A is weaker, and the response of annual T S to changes in T A is smaller in boreal regions than in the arctic and the northern temperate regions. Consequently, the inter-annual variation and the increasing trends of annual T S are smaller than that of T A in boreal regions. The systematic and significant differences in the relationship between T S and T A across the circumpolar north is important for understanding and assessing the impacts of climate change and for reconstruction of historical climate based on ground temperature profiles for the northern high latitudes.

show abstract

Section: Discussionmentioning

confidence: 99%

Impacts of snow on soil temperature observed across the circumpolar north

Sherstiukov

Qian

Kokelj

et al. 2018

Environ. Res. Lett.

View full text Add to dashboard Cite

show abstract

“…For this study, we use temperature data measured in three shallow boreholes near the town of Nadym, north‐west Siberia. Ground temperature monitoring in the area started in the 1970s . Permafrost in the Nadym area is discontinuous and creates a mosaic of different soil types .…”

Section: Introductionmentioning

confidence: 99%

“…Ground temperature monitoring in the area started in the 1970s . Permafrost in the Nadym area is discontinuous and creates a mosaic of different soil types . This type of permafrost is prone to rapid changes and thawing .…”

Section: Introductionmentioning

confidence: 99%

Observations and modelling of ground temperature evolution in the discontinuous permafrost zone in Nadym, north‐west Siberia

Kukkonen

Suhonen

Ezhova

et al. 2020

Permafrost & Periglacial

View full text Add to dashboard Cite

We analyze ground temperatures measured daily at depths of 0-10 m in the Nadym region, north-west Siberia (65 18 0 N, 72 6 0 E). Nadym is located within the discontinuous permafrost zone and the forest-tundra transition subzone, thus representing an area threatened by permafrost thawing. Soil comprises a 0.4-1.0-m-thick topmost layer of peat with high porosity (~0.9), underlain by layers of mineral soil (sand, clay, loam) with lower porosities of 0.3-0.4. With a numerical heat transfer model, we provide predictions of general permafrost development for the next 300 years. Furthermore, we apply the model with the same time frame, to predict permafrost evolution in two monitoring boreholes (BH) in the Nadym area, BH 1-09 and 3-09 with present (2012-2016) temperatures at the top of the permafrost (TTOP) of −2.0 and 0.0 C, respectively. Applying a mild warming trend (0.02 C/yr in mean annual air temperature [MAAT], corresponding to the IPCC representative concentration pathway trend RCP 2.6) does not lead to thawing of permafrost during the applied 300 years of simulation time in BH 1-09, whereas in BH 3-09 thawing has already begun. Applying a strong warming trend of 0.05 C/yr in MAAT (corresponding to RCP 8.5) leads to gradual thawing of permafrost in both boreholes. K E Y W O R D S climate change, freezing and thawing indices, Nadym, permafrost, temperature, thermal modeling, West Siberia

show abstract

“…where λ is the thermal conductivity of thawing soil (W m −1 • C −1 ); s = 86,400 (s day −1 ) is a time conversion factor; Q is the volumetric latent heat of fusion (J m −3 ); and n is the n-factor, which is equal to the ratio of degree-day sums of ground surface to air temperatures when both of them are above 0 • C. The n-factor not only characterizes the seasonal winter and summer surface energy balance [38], but also incorporates all microclimatic effects (radiation, convection, evapotranspiration, etc.) related to vegetation [39].…”

Section: Modeling the Active Layermentioning

confidence: 99%

Spatio-Temporal Variations of Soil Active Layer Thickness in Chinese Boreal Forests from 2000 to 2015

et al. 2018

View full text Add to dashboard Cite

The soil active layer in boreal forests is sensitive to climate warming. Climate-induced changes in the active layer may greatly affect the global carbon budget and planetary climatic system by releasing large quantities of greenhouse gases that currently are stored in permafrost. Ground surface temperature is an immediate driver of active layer thickness (ALT) dynamics. In this study, we mapped ALT distribution in Chinese boreal larch forests from 2000 to 2015 by integrating remote sensing data with the Stefan equation. We then examined the changes of the ALT in response to changes in ground surface temperature and identified drivers of the spatio-temporal patterns of ALT. Active layer thickness varied from 1.18 to 1.3 m in the study area. Areas of nonforested land and low elevation or with increased air temperature had a relatively high ALT, whereas ALT was lower at relatively high elevation and with decreased air temperatures. Interannual variations of ALT had no obvious trend, however, and the ALT changed at a rate of only −0.01 and 0.01 m year −1 . In a mega-fire patch of 79,000 ha burned in 2003, ∆ALT (ALT i − ALT 2002 , where 2003 ≤ i ≤ 2015) was significantly higher than in the unburned area, with the influence of the wildfire persisting 10 years. Under the high emission scenario (RCP8.5), an increase of 2.6-4.8 • C in mean air temperature would increase ALT into 1.46-1.55 m by 2100, which in turn would produce a significant positive feedback to climate warming.

show abstract

Contrasting Soil Thermal Regimes in the Forest-Tundra Transition Near Nadym, West Siberia, Russia

Cited by 19 publications

References 25 publications

Impacts of snow on soil temperature observed across the circumpolar north

Impacts of snow on soil temperature observed across the circumpolar north

Observations and modelling of ground temperature evolution in the discontinuous permafrost zone in Nadym, north‐west Siberia

Spatio-Temporal Variations of Soil Active Layer Thickness in Chinese Boreal Forests from 2000 to 2015

Contact Info

Product

Resources

About