Continued Permafrost Warming on the Arctic Slope of Alaska, 2014 - PowerPoint PPT Presentation

Continued Permafrost Warming on the Arctic Slope of Alaska, 2014 Update Gary Clow USGS/INSTAAR

Alaska Climate Divisions Bieniek et al. (2014)

Statewide Air-Temperature Anomaly dT = +0.9 K 5-yr running ave Bieniek et al. (2014)

Statewide Air-Temperature Anomaly 5-yr running ave Bieniek et al. (2014)

Arctic Slope Air-Temperature Anomaly 5-yr running ave Bieniek et al. (2014)

Sea Ice Extent Sep-2011 NSIDC/NOAA

Air-Temperature Patterns, Arctic Alaska A common pattern NE wind • With the juxtaposition of the Chukchi Sea, Beaufort Sea, and Brooks Range, weather and climate patterns are somewhat complicated on the Arctic Slope. Warm Chukchi sector Cool Chukchi sector Cool NPR-A / Warm Arctic NWR Air temperature reanalyses produced using the WRF model, 3.3-km resolution.

USGS Climate-Station Network, Arctic Alaska telemetry air temp wind GTN-P radiation rainfall Beaufort Sea ground temps snow depth Chukchi soil moisture Sea

Mean-Annual Air-Temperature Trends Stations with at least 10 years of data ° C/decade Beaufort Sea Chukchi +1.44 Sea +1.63 +0.70 +0.27 +0.92 +0.87

Fish Creek Seasonal Air-Temperature Trends 1992-2013

Atmosphere Active Layer 30 cm (thaws in summer) Permafrost

Mean-Annual Active-Layer Temperature Trends Stations with at least 10 years of data ° C/decade air +1.44 active layer +1.62 +1.63 +0.70 +0.27 +1.86 +1.48 +0.92 +0.36 +0.65 na +0.87 +1.46 +0.66

Fish Creek Seasonal Ground-Temperature Trends 1998-2013 Active Layer (10 cm)

Snow and Active-Layer Snow Depth winter trend +10.8 cm / decade Snow Depth (cm) Fish Creek Maximum Active-layer Depth Active-layer Freeze-up Date Day of Year Depth (cm) Fish Creek Fish Creek Year Year

USGS Deep-Borehole Array Thermal State of Permafrost GTN-P Beaufort Sea Chukchi Sea

Permafrost Temperatures: South Meade Well 1980

Permafrost Temperatures: South Meade Well 1989 1980 2012 20-m temps +2.4 ° C warming since 1980 +2.9 ° C warming since 1989

FCK , Coastal Plain Permafrost Temperatures +2.9 ° C Deep Borehole Array 2012 Depth (m) ESN , Beaufort Coast +1.8 ° C 2012 Depth (m) TLK , Chukchi Coast +1.9 ° C SME , Coastal Plain 2012 +2.4 ° C 2012 Depth (m) Temperature ( ° C) Depth (m) Temperature ( ° C) Temperature ( ° C)

Permafrost Warming since 1990 (20-m depth) Beaufort Sea Chukchi Sea 2.1 K 1.8 K 2.8 K

Current Permafrost Temperatures at 20-m Depth Beaufort Sea Chukchi Sea - 7.7 - 7.0 - 6.5 - 6.4 - 6.2 - 7.4 - 6.3 - 7.2 - 6.6 - 6.2 - 5.4 - 4.1 - 2.7 - 4.3 - 3.9 - 1.4

Permafrost Zones Alaska Active Layer Permafrost Continuous Permafrost Discontinuous Permafrost

Permafrost Zones Alaska Active Layer Permafrost air = -8 ° C T mean-annual T g = -5 ° C Continuous Permafrost Discontinuous Permafrost

Current Permafrost Temperatures at 20-m Depth Beaufort Sea Chukchi Sea Discontinuous Permafrost

Summary: • Air temperatures across the Arctic Slope are continuing to warm during the autumn. • Active-layer temperatures are increasing during all seasons except summer. - increased autumn air temperatures - thicker cold-season snowpacks • Permafrost temperatures have warmed 2-3 K since 1990 and are continuing to do so. (1 K / decade) • The discontinuous permafrost boundary is primed to jump north of the Brooks Range.

Continued Permafrost Warming on the Arctic Slope of Alaska, 2014 - PowerPoint PPT Presentation

Continued Permafrost Warming on the Arctic Slope of Alaska, 2014 Update Gary Clow USGS/INSTAAR Alaska Climate Divisions Bieniek et al. (2014) Statewide Air-Temperature Anomaly dT = +0.9 K 5-yr running ave Bieniek et al. (2014) Statewide

Continued Permafrost Warming in Northern Alaska, 2008 Update Gary Clow Earth Surface Dynamics

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