Search Results - "Swanson, David K"

Thermokarst and precipitation drive changes in the area of lakes and ponds in the National Parks of northwestern Alaska, 1984-2018 by Swanson, David K.

“…Lakes and ponds are important ecosystem components in arctic lowlands, and they are prone to rapid changes in surface area by thermokarst expansion and by…”
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Start of the Green Season and Normalized Difference Vegetation Index in Alaska’s Arctic National Parks by Swanson, David K.

“…Daily Normalized Difference Vegetation Index (NDVI) values from the MODIS Aqua and Terra satellites were compared with on-the-ground camera observations at…”
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Environmental Limits of Tall Shrubs in Alaska's Arctic National Parks by Swanson, David K

“…We sampled shrub canopy volume (height times area) and environmental factors (soil wetness, soil depth of thaw, soil pH, mean July air temperature, and typical…”
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Spatiotemporal remote sensing of ecosystem change and causation across Alaska by Pastick, Neal J., Jorgenson, M. Torre, Goetz, Scott J., Jones, Benjamin M., Wylie, Bruce K., Minsley, Burke J., Genet, Hélène, Knight, Joseph F., Swanson, David K., Jorgenson, Janet C.

“…Contemporary climate change in Alaska has resulted in amplified rates of press and pulse disturbances that drive ecosystem change with significant consequences…”
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A high-resolution map of coastal vegetation for two Arctic Alaskan parklands: An object-oriented approach with point training data by Hampton-Miller, Celia J, Neitlich, Peter N, Swanson, David K

“…Bering Land Bridge National Preserve and Cape Krusenstern National Monument in northwest Alaska have approximately 1600 km of predominantly soft-sediment…”
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Cascading effects of climate change and wildfire on a subarctic lake: A 20‐year case study of watershed change by Larsen, Amy S., Rupp, Danielle L., Swanson, David K., Hill, Kenneth R.

“…Mean annual air temperature has been increasing in Alaska since the 1970s and is expected to continue to increase through the current century, resulting in…”
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Permafrost thaw‐related slope failures in Alaska’s Arctic National Parks, c. 1980–2019 by Swanson, David K.

“…Active‐layer detachments (ALD) and retrogressive thaw slumps (RTS) are landslides that occur as a result of thaw in permafrost regions. I mapped the extent of…”
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Growth of Retrogressive Thaw Slumps in the Noatak Valley, Alaska, 2010–2016, Measured by Airborne Photogrammetry by Swanson, David, Nolan, Matt

“…We monitored the growth of 22 retrogressive thaw slumps (RTS), dramatic erosion features associated with thaw of permafrost, in the Noatak Valley of northern…”
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Hindcasts of passerine density in arctic and subarctic Alaska suggest noncomplementary responses to shrub expansion by tundra- and shrub-adapted species by Mizel, Jeremy D., Swanson, David K.

“…Shrub expansion is among the most conspicuous of the warming-related phenomena occurring within tundra regions, but its effects on vertebrates are not well…”
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Increased mean annual temperatures in 2014-2019 indicate permafrost thaw in Alaskan national parks by Swanson, David K., Sousanes, Pamela J., Hill, Ken

“…Rising temperatures in the Arctic can result in thaw of permafrost, with widespread implications for ecosystems and infrastructure. We analyzed mean annual air…”
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Trends in Greenness and Snow Cover in Alaska’s Arctic National Parks, 2000–2016 by Swanson, David

“…In cold-limited arctic environments, the duration and timing of the snow cover and the vegetation green season have major ecological implications. I monitored…”
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Dissolved organic matter composition of Arctic rivers: Linking permafrost and parent material to riverine carbon by O'Donnell, Jonathan A., Aiken, George R., Swanson, David K., Panda, Santosh, Butler, Kenna D., Baltensperger, Andrew P.

“…Recent climate change in the Arctic is driving permafrost thaw, which has important implications for regional hydrology and global carbon dynamics. Permafrost…”
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Latent trajectory models for spatio‐temporal dynamics in Alaskan ecosystems by Lu, Xinyi, Hooten, Mevin B., Raiho, Ann M., Swanson, David K., Roland, Carl A., Stehn, Sarah E.

“…The Alaskan landscape has undergone substantial changes in recent decades, most notably the expansion of shrubs and trees across the Arctic. We developed a…”
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Multivariate Bayesian clustering using covariate‐informed components with application to boreal vegetation sensitivity by Scharf, Henry R., Raiho, Ann M., Pugh, Sierra, Roland, Carl A., Swanson, David K., Stehn, Sarah E., Hooten, Mevin B.

“…Climate change is impacting both the distribution and abundance of vegetation, especially in far northern latitudes. The effects of climate change are…”
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Searching for refuge: A framework for identifying site factors conferring resistance to climate-driven vegetation change by Raiho, Ann M., Scharf, Henry R., Roland, Carl A., Swanson, David K., Stehn, Sarah E., Hooten, Mevin B.

“…Aim Climate change is occurring at accelerated rates in high latitude regions such as Alaska, causing alterations in woody plant growth and associated…”
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Projected changes in diverse ecosystems from climate warming and biophysical drivers in northwest Alaska by Jorgenson, Mark Torre, Marcot, Bruce G., Swanson, David K., Jorgenson, Janet C., DeGange, Anthony R.

“…Climate warming affects arctic and boreal ecosystems by interacting with numerous biophysical factors across heterogeneous landscapes. To assess potential…”
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Lichen traits and species as indicators of vegetation and environment by Nelson, Peter R, McCune, Bruce, Swanson, David K

“…Lichens in the Arctic play important ecological roles. They also face the threats of increasing fire and shrub and tree expansion, exacerbated or caused by…”
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Delayed spring onset drives declines in abundance and recruitment in a mountain ungulate by Rattenbury, Kumi L., Schmidt, Joshua H., Swanson, David K., Borg, Bridget L., Mangipane, Buck A., Sousanes, Pam J.

“…Changes in climate are driving widespread landscape changes in northern ecosystems, altering the size and distribution of wildlife populations over…”
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Transcutaneous multielectrode basket catheter for endocardial mapping and ablation of ventricular tachycardia in the pig by ELDAR, M, OHAD, D. G, GOLDBERGER, J. J, ROTSTEIN, Z, HSU, S, SWANSON, D. K, GREENSPON, A. J

“…Endocardial mapping using standard electrode catheters is often technically limited in ventricular tachycardia and constitutes a major obstacle to successful…”
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Percutaneous multielectrode endocardial mapping during ventricular tachycardia in the swine model by ELDAR, M, FITZPATRICK, A. P, CHIN, M, SCHEINMAN, M. M, LESH, M. D, GREENSPON, A. J, OHAD, D, SMITH, M. F, HSU, S, WHAYNE, J. G, VERED, Z, ROTSTEIN, Z, KORDIS, T, SWANSON, D. K

“…Identification of critical areas within the ventricular tachycardia circuit is a prerequisite for catheter ablation. Currently, mapping during ventricular…”
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