Past and recent changes in air and permafrost temperatures in eastern Siberia

Romanovsky, V. E.; Sazonova, Tatiana Sergeevna; Balobaev, V. T.; Shender, N.I.; Sergueev, D. O.

doi:10.1016/j.gloplacha.2006.07.022

Cited by 163 publications

(141 citation statements)

References 26 publications

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“…Since the start of permafrost temperature observations on Samoylov Island in 2006, the temperatures at depths of 10 and 20 m have increased continuously, as has also been reported from permafrost observatories in Northern Alaska (Romanovsky et al, 2010b). A general increase in permafrost temperatures has also been observed over the last few decades in Alaska (Romanovsky et al, 2007(Romanovsky et al, , 2010bOsterkamp, 2008;Smith et al, 2010), Northwest Canada (Smith et al, 2010), and Siberia (Oberman, 2008;Romanovsky et al, 2010a).…”

Section: Climate and Permafrostmentioning

confidence: 76%

“…Later snow melt (at the end of June) has been reported from Zackenberg, Greenland, and from Ny-Ålesund, Spitsbergen (Lloyd et al, 2001). With a mean annual permafrost temperature of −8.6 • C at 10.7 m depth, the study site is one of the coldest permafrost regions on earth (Romanovsky et al, 2010a). Brown and Romanovsky (2008) have presented records of permafrost temperatures from 27 circumpolar sites in the Northern Hemisphere.…”

Section: Climate and Permafrostmentioning

confidence: 84%

“…A general increase in permafrost temperatures has also been observed over the last few decades in Alaska (Romanovsky et al, 2007(Romanovsky et al, , 2010bOsterkamp, 2008;Smith et al, 2010), Northwest Canada (Smith et al, 2010), and Siberia (Oberman, 2008;Romanovsky et al, 2010a).…”

Section: Climate and Permafrostmentioning

confidence: 94%

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Baseline characteristics of climate, permafrost and land cover from a new permafrost observatory in the Lena River Delta, Siberia (1998–2011)

et al. 2013

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Abstract. Samoylov Island is centrally located within the Lena River Delta at 72° N, 126° E and lies within the Siberian zone of continuous permafrost. The landscape on Samoylov Island consists mainly of late Holocene river terraces with polygonal tundra, ponds and lakes, and an active floodplain. The island has been the focus of numerous multidisciplinary studies since 1993, which have focused on climate, land cover, ecology, hydrology, permafrost and limnology. This paper aims to provide a framework for future studies by describing the characteristics of the island's meteorological parameters (temperature, radiation and snow cover), soil temperature, and soil moisture. The land surface characteristics have been described using high resolution aerial images in combination with data from ground-based observations. Of note is that deeper permafrost temperatures have increased between 0.3 to 1.3 °C over the last five years. However, no clear warming of air and active layer temperatures is detected since 1998, though winter air temperatures during recent years have not been as cold as in earlier years. Data related to this article are archived under: http://doi. pangaea.de/10.1594/PANGAEA.806233 .

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Section: Climate and Permafrostmentioning

confidence: 76%

Section: Climate and Permafrostmentioning

confidence: 84%

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Baseline characteristics of climate, permafrost and land cover from a new permafrost observatory in the Lena River Delta, Siberia (1998–2011)

et al. 2013

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“…The EST consists of 13 sites that cover a southwest-to-northeast transect in east Siberia (60.7 • N, 114.9 • E to 68.3 • N, 145 • E) during the period 1882-1994 (Romanovsky et al, 2007). For this study, we focus on the nine sites which report measurements as monthly averages at regular depths of 0.2, 0.4, 0.8, 1.6, and 3.2 m. Unfortunately, data gaps of years to decades exist on a site-by-site basis, and many years do not report the full annual cycle over multiple layers.…”

Section: Observationsmentioning

confidence: 99%

Detecting the permafrost carbon feedback: talik formation and increased cold-season respiration as precursors to sink-to-source transitions

et al. 2018

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Abstract. Thaw and release of permafrost carbon (C) due to climate change is likely to offset increased vegetation C uptake in northern high-latitude (NHL) terrestrial ecosystems. Models project that this permafrost C feedback may act as a slow leak, in which case detection and attribution of the feedback may be difficult. The formation of talik, a subsurface layer of perennially thawed soil, can accelerate permafrost degradation and soil respiration, ultimately shifting the C balance of permafrost-affected ecosystems from long-term C sinks to long-term C sources. It is imperative to understand and characterize mechanistic links between talik, permafrost thaw, and respiration of deep soil C to detect and quantify the permafrost C feedback. Here, we use the Community Land Model (CLM) version 4.5, a permafrost and biogeochemistry model, in comparison to long-term deep borehole data along North American and Siberian transects, to investigate thaw-driven C sources in NHL (> 55∘ N) from 2000 to 2300. Widespread talik at depth is projected across most of the NHL permafrost region (14 million km2) by 2300, 6.2 million km2 of which is projected to become a long-term C source, emitting 10 Pg C by 2100, 50 Pg C by 2200, and 120 Pg C by 2300, with few signs of slowing. Roughly half of the projected C source region is in predominantly warm sub-Arctic permafrost following talik onset. This region emits only 20 Pg C by 2300, but the CLM4.5 estimate may be biased low by not accounting for deep C in yedoma. Accelerated decomposition of deep soil C following talik onset shifts the ecosystem C balance away from surface dominant processes (photosynthesis and litter respiration), but sink-to-source transition dates are delayed by 20–200 years by high ecosystem productivity, such that talik peaks early (∼ 2050s, although borehole data suggest sooner) and C source transition peaks late (∼ 2150–2200). The remaining C source region in cold northern Arctic permafrost, which shifts to a net source early (late 21st century), emits 5 times more C (95 Pg C) by 2300, and prior to talik formation due to the high decomposition rates of shallow, young C in organic-rich soils coupled with low productivity. Our results provide important clues signaling imminent talik onset and C source transition, including (1) late cold-season (January–February) soil warming at depth (∼ 2 m), (2) increasing cold-season emissions (November–April), and (3) enhanced respiration of deep, old C in warm permafrost and young, shallow C in organic-rich cold permafrost soils. Our results suggest a mosaic of processes that govern carbon source-to-sink transitions at high latitudes and emphasize the urgency of monitoring soil thermal profiles, organic C age and content, cold-season CO2 emissions, and atmospheric 14CO2 as key indicators of the permafrost C feedback.

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“…The warming of permafrost is strongly correlated to increasing atmospheric temperatures, especially when considering longer timescales (Romanovsky et al 2007). …”

Section: Introductionmentioning

confidence: 99%

Air warming trends linked to permafrost warming in the sub-Arctic catchment of Tarfala, Sweden

Pannetier

Frampton

2016

Polar Research

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Past and recent changes in air and permafrost temperatures in eastern Siberia

Cited by 163 publications

References 26 publications

Baseline characteristics of climate, permafrost and land cover from a new permafrost observatory in the Lena River Delta, Siberia (1998–2011)

Baseline characteristics of climate, permafrost and land cover from a new permafrost observatory in the Lena River Delta, Siberia (1998–2011)

Detecting the permafrost carbon feedback: talik formation and increased cold-season respiration as precursors to sink-to-source transitions

Air warming trends linked to permafrost warming in the sub-Arctic catchment of Tarfala, Sweden

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