Works by Welker, Jeffrey M.

Results: 102

Estimation of Carbon Sequestration by Combining Remote Sensing and Net Ecosystem Exchange Data for Northern Mixed-Grass Prairie and Sagebrush–Steppe Ecosystems.

Published in:

Environmental Management, 2004, v. 33, p. S432, doi. 10.1007/s00267-003-9151-0

By:

Hunt Jr., E. Raymond;
Kelly, Robert D.;
Smith, William K.;
Fahnestock, Jace T.;
Welker, Jeffrey M.;
Reiners, William A.

Publication type:

Article

Resistance and change in a High Arctic ecosystem, NW Greenland: Differential sensitivity of ecosystem metrics to 15 years of experimental warming and wetting.

Published in:

Global Change Biology, 2022, v. 28, n. 5, p. 1853, doi. 10.1111/gcb.16027

By:

Jespersen, Robert Gus;
Leffler, Alan Joshua;
Väisänen, Maria;
Welker, Jeffrey M.

Publication type:

Article

Winter snow and spring temperature have differential effects on vegetation phenology and productivity across Arctic plant communities.

Published in:

Global Change Biology, 2021, v. 27, n. 8, p. 1572, doi. 10.1111/gcb.15505

By:

Kelsey, Katharine C.;
Pedersen, Stine Højlund;
Leffler, A. Joshua;
Sexton, Joseph O.;
Feng, Min;
Welker, Jeffrey M.

Publication type:

Article

Delayed herbivory by migratory geese increases summer‐long CO2 uptake in coastal western Alaska.

Published in:

Global Change Biology, 2019, v. 25, n. 1, p. 277, doi. 10.1111/gcb.14473

By:

Leffler, A. Joshua;
Beard, Karen H.;
Kelsey, Katharine C.;
Choi, Ryan T.;
Schmutz, Joel A.;
Welker, Jeffrey M.

Publication type:

Article

Long-term increase in snow depth leads to compositional changes in arctic ectomycorrhizal fungal communities.

Published in:

Global Change Biology, 2016, v. 22, n. 9, p. 3080, doi. 10.1111/gcb.13294

By:

Morgado, Luis N.;
Semenova, Tatiana A.;
Welker, Jeffrey M.;
Walker, Marilyn D.;
Smets, Erik;
Geml, József

Publication type:

Article

Winter precipitation and snow accumulation drive the methane sink or source strength of Arctic tussock tundra.

Published in:

Global Change Biology, 2016, v. 22, n. 8, p. 2818, doi. 10.1111/gcb.13242

By:

Blanc‐Betes, Elena;
Welker, Jeffrey M.;
Sturchio, Neil C.;
Chanton, Jeffrey P.;
Gonzalez‐Meler, Miquel A.

Publication type:

Article

Summer temperature increase has distinct effects on the ectomycorrhizal fungal communities of moist tussock and dry tundra in Arctic Alaska.

Published in:

Global Change Biology, 2015, v. 21, n. 2, p. 959, doi. 10.1111/gcb.12716

By:

Morgado, Luis N.;
Semenova, Tatiana A.;
Welker, Jeffrey M.;
Walker, Marilyn D.;
Smets, Erik;
Geml, József

Publication type:

Article

Complex carbon cycle responses to multi-level warming and supplemental summer rain in the high Arctic.

Published in:

Global Change Biology, 2013, v. 19, n. 6, p. 1780, doi. 10.1111/gcb.12149

By:

Sharp, Elizabeth D.;
Sullivan, Patrick F.;
Steltzer, Heidi;
Csank, Adam Z.;
Welker, Jeffrey M.

Publication type:

Article

Large herbivores limit CO2 uptake and suppress carbon cycle responses to warming in West Greenland.

Published in:

Global Change Biology, 2012, v. 18, n. 2, p. 469, doi. 10.1111/j.1365-2486.2011.02528.x

By:

Cahoon, Sean M. P.;
Sullivan, Patrick F.;
Post, Eric;
Welker, Jeffrey M.

Publication type:

Article

Arctic and North Atlantic Oscillation phase changes are recorded in the isotopes ( δ18O and δ13C) of Cassiope tetragona plants.

Published in:

Global Change Biology, 2005, v. 11, n. 7, p. 997, doi. 10.1111/j.1365-2486.2005.00961.x

By:

Welker, Jeffrey M.;
Rayback, Shelly;
Henry, Greg H . R.

Publication type:

Article

CO2 exchange in three Canadian High Arctic ecosystems: response to long-term experimental warming.

Published in:

Global Change Biology, 2004, v. 10, n. 12, p. 1981, doi. 10.1111/j.1365-2486.2004.00857.x

By:

Welker, Jeffrey M.;
Fahnestock, Jace T.;
Henry, Greg H.R.;
O'Dea, Kevin W.;
Chimner, Rodney A.

Publication type:

Article

Grizzly bear behavior in south-central Alaska: Use of a hidden Markov model to assess behavior.

Published in:

Ursus, 2024, v. 2024, n. 35e22, p. 1, doi. 10.2192/URSUS-D-23-00004R1

By:

Mumford, Amanda M.;
Stetz, Jeffrey;
Demma, Dominic;
Dial, Roman;
Welker, Jeffrey M.

Publication type:

Article

ENSO effects on δ18O, δ2H and d-excess values in precipitation across the U.S. using a high-density, long-term network (USNIP).

Published in:

Rapid Communications in Mass Spectrometry: RCM, 2012, v. 26, n. 17, p. 1893, doi. 10.1002/rcm.6298

By:

Welker, Jeffrey M.

Publication type:

Article

Baffin Bay sea ice extent and synoptic moisture transport drive water vapor isotope (δ18O, δ2H, and deuterium excess) variability in coastal northwest Greenland.

Published in:

Atmospheric Chemistry & Physics, 2020, v. 20, n. 22, p. 13929, doi. 10.5194/acp-20-13929-2020

By:

Akers, Pete D.;
Kopec, Ben G.;
Mattingly, Kyle S.;
Klein, Eric S.;
Causey, Douglas;
Welker, Jeffrey M.

Publication type:

Article

Influence of sea ice on ocean water vapor isotopes and Greenland ice core records.

Published in:

Geophysical Research Letters, 2016, v. 43, n. 24, p. 12,475, doi. 10.1002/2016GL071748

By:

Klein, Eric S.;
Welker, Jeffrey M.

Publication type:

Article

Deeper snow increases the net soil organic carbon accrual rate in moist acidic tussock tundra: 210Pb evidence from Arctic Alaska.

Published in:

Arctic, Antarctic & Alpine Research, 2020, v. 52, n. 1, p. 461, doi. 10.1080/15230430.2020.1802864

By:

DeFranco, Karyn C.;
Ricketts, Michael P.;
Blanc-Betes, Elena;
Welker, Jeffrey M.;
Gonzalez-Meler, Miquel A.;
Sturchio, Neil C.

Publication type:

Article

Evidence of Nonlinearity in the Response of Net Ecosystem CO2 Exchange to Increasing Levels of Winter Snow Depth in the High Arctic of Northwest Greenland.

Published in:

Arctic, Antarctic & Alpine Research, 2011, v. 43, n. 1, p. 95, doi. 10.1657/1938-4246-43.1.95

By:

Rogers, Matthew C.;
Sullivan, Patrick F.;
Welker, Jeffrey M.

Publication type:

Article

Radiocarbon Content of CO2 Respired from High Arctic Tundra in Northwest Greenland.

Published in:

Arctic, Antarctic & Alpine Research, 2010, v. 42, n. 3, p. 342, doi. 10.1657/1938-4246-42.3.342

By:

Czimczik, Claudia I.;
Welker, Jeffrey M.

Publication type:

Article

Alpine Grassland CO2 Exchange and Nitrogen Cycling: Grazing History Effects, Medicine Bow Range, Wyoming, U.S.A.

Published in:

Arctic, Antarctic & Alpine Research, 2004, v. 36, n. 1, p. 11, doi. 10.1657/1523-0430(2004)036[0011:AGCEAN]2.0.CO;2

By:

Welker, Jeffrey M.;
Fahnestock, Jace T.;
Povirk, Kyra L.;
Bilbrough, Carol J.;
Piper, Robert E.

Publication type:

Article

Early Spring Nitrogen Uptake by Snow-Covered Plants: A Comparison of Arctic and Alpine Plant Function under the Snowpack.

Published in:

Arctic, Antarctic & Alpine Research, 2000, v. 32, n. 4, p. 404, doi. 10.1080/15230430.2000.12003384

By:

Bilbrough, Carol J.;
Welker, Jeffrey M.;
Bowman, William D.

Publication type:

Article

Flushing or mixing? Stable water isotopes reveal differences in arctic forest and peatland soil water seasonality.

Published in:

Hydrological Processes, 2023, v. 37, n. 1, p. 1, doi. 10.1002/hyp.14811

By:

Muhic, Filip;
Ala‐Aho, Pertti;
Noor, Kashif;
Welker, Jeffrey M.;
Klöve, Björn;
Marttila, Hannu

Publication type:

Article

Stormflows Drive Stream Carbon Concentration, Speciation, and Dissolved Organic Matter Composition in Coastal Temperate Rainforest Watersheds.

Published in:

Journal of Geophysical Research. Biogeosciences, 2020, v. 125, n. 9, p. 1, doi. 10.1029/2020JG005804

By:

Fellman, Jason B.;
Hood, Eran;
Behnke, Megan I.;
Welker, Jeffrey M.;
Spencer, Robert G. M.

Publication type:

Article

Seasonal Patterns of Riverine Carbon Sources and Export in NW Greenland.

Published in:

Journal of Geophysical Research. Biogeosciences, 2019, v. 124, n. 4, p. 840, doi. 10.1029/2018JG004895

By:

Csank, Adam Z.;
Czimczik, Claudia I.;
Xu, Xiaomei;
Welker, Jeffrey M.

Publication type:

Article

Diminishing warming effects on plant phenology over time.

Published in:

New Phytologist, 2025, v. 245, n. 2, p. 523, doi. 10.1111/nph.20019

By:

Lu, Chunyan;
van Groenigen, Kees Jan;
Gillespie, Mark A. K.;
Hollister, Robert D.;
Post, Eric;
Cooper, Elisabeth J.;
Welker, Jeffrey M.;
Huang, Yixuan;
Min, Xueting;
Chen, Jianghui;
Jónsdóttir, Ingibjörg Svala;
Mauritz, Marguerite;
Cannone, Nicoletta;
Natali, Susan M.;
Schuur, Edward;
Molau, Ulf;
Yan, Tao;
Wang, Hao;
He, Jin‐Sheng;
Liu, Huiying

Publication type:

Article

NDVI Changes Show Warming Increases the Length of the Green Season at Tundra Communities in Northern Alaska: A Fine-Scale Analysis.

Published in:

Frontiers in Plant Science, 2020, v. 11, p. N.PAG, doi. 10.3389/fpls.2020.01174

By:

May, Jeremy L.;
Hollister, Robert D.;
Betway, Katlyn R.;
Harris, Jacob A.;
Tweedie, Craig E.;
Welker, Jeffrey M.;
Gould, William A.;
Oberbauer, Steven F.

Publication type:

Article

DOC export is exceeded by C fixation in May Creek: A late-successional watershed of the Copper River Basin, Alaska.

Published in:

PLoS ONE, 2019, v. 14, n. 11, p. 1, doi. 10.1371/journal.pone.0225271

By:

Tomco, Patrick L.;
Zulueta, Rommel C.;
Miller, Leland C.;
Zito, Phoebe A.;
Campbell, Robert W.;
Welker, Jeffrey M.

Publication type:

Article

Contribution of fluorescent primary biological aerosol particles to low-level Arctic cloud residuals.

Published in:

Atmospheric Chemistry & Physics, 2024, v. 24, n. 9, p. 5479, doi. 10.5194/acp-24-5479-2024

By:

Pereira Freitas, Gabriel;
Kopec, Ben;
Adachi, Kouji;
Krejci, Radovan;
Heslin-Rees, Dominic;
Yttri, Karl Espen;
Hubbard, Alun;
Welker, Jeffrey M.;
Zieger, Paul

Publication type:

Article

The age of surface-exposed ice along the northern margin of the Greenland Ice Sheet.

Published in:

Journal of Glaciology, 2020, v. 66, n. 258, p. 667, doi. 10.1017/jog.2020.62

By:

MacGregor, Joseph A.;
Fahnestock, Mark A.;
Colgan, William T.;
Larsen, Nicolaj K.;
Kjeldsen, Kristian K.;
Welker, Jeffrey M.

Publication type:

Article

The Pivotal Role of Evaporation in Lake Water Isotopic Variability Across Space and Time in a High Arctic Periglacial Landscape.

Published in:

Water Resources Research, 2024, v. 60, n. 10, p. 1, doi. 10.1029/2023WR036121

By:

Akers, Pete D.;
Kopec, Ben G.;
Klein, Eric S.;
Bailey, Hannah;
Welker, Jeffrey M.

Publication type:

Article

The Spatiotemporal Variability of Snowpack and Snowmelt Water 18O and 2H Isotopes in a Subarctic Catchment.

Published in:

Water Resources Research, 2023, v. 59, n. 1, p. 1, doi. 10.1029/2022WR033101

By:

Noor, Kashif;
Marttila, Hannu;
Klöve, Björn;
Welker, Jeffrey M.;
Ala-aho, Pertti

Publication type:

Article

From Intra-plant to Regional Scale: June Temperatures and Regional Climates Directly and Indirectly Control Betula nana Growth in Arctic Alaska.

Published in:

Ecosystems, 2023, v. 26, n. 3, p. 491, doi. 10.1007/s10021-022-00771-8

By:

Buchwal, Agata;
Bret-Harte, M. Syndonia;
Bailey, Hannah;
Welker, Jeffrey M.

Publication type:

Article

Goose Feces Effects on Subarctic Soil Nitrogen Availability and Greenhouse Gas Fluxes.

Published in:

Ecosystems, 2023, v. 26, n. 1, p. 187, doi. 10.1007/s10021-022-00752-x

By:

Beard, Karen H.;
Kelsey, Katharine C.;
Choi, Ryan T.;
Welker, Jeffrey M.;
Leffler, A. Joshua

Publication type:

Article

Early Goose Arrival Increases Soil Nitrogen Availability More Than an Advancing Spring in Coastal Western Alaska.

Published in:

Ecosystems, 2020, v. 23, n. 6, p. 1309, doi. 10.1007/s10021-019-00472-9

By:

Choi, Ryan T.;
Beard, Karen H.;
Kelsey, Katharine C.;
Leffler, A. Joshua;
Schmutz, Joel A.;
Welker, Jeffrey M.

Publication type:

Article

Short‐term effects of experimental goose grazing and warming differ in three low‐Arctic coastal wetland plant communities.

Published in:

Journal of Vegetation Science, 2022, v. 33, n. 3, p. 1, doi. 10.1111/jvs.13139

By:

Choi, Ryan T.;
Petit Bon, Matteo;
Leffler, A. Joshua;
Kelsey, Katharine C.;
Welker, Jeffrey M.;
Beard, Karen H.

Publication type:

Article

Twentieth century erosion in Arctic Alaska foothills: The influence of shrubs, runoff, and permafrost.

Published in:

Journal of Geophysical Research. Biogeosciences, 2011, v. 116, n. G4, p. n/a, doi. 10.1029/2011JG001795

By:

Tape, Ken D.;
Verbyla, David;
Welker, Jeffrey M.

Publication type:

Article

Continuous estimates of CO2 efflux from arctic and boreal soils during the snow-covered season in Alaska.

Published in:

Journal of Geophysical Research. Biogeosciences, 2008, v. 113, n. G4, p. n/a, doi. 10.1029/2008JG000715

By:

Sullivan, Patrick F.;
Welker, Jeffrey M.;
Arens, Seth J. T.;
Sveinbjörnsson, Bjartmar

Publication type:

Article

Energy and water additions give rise to simple responses in plant canopy and soil microclimates of a high arctic ecosystem.

Published in:

Journal of Geophysical Research. Biogeosciences, 2008, v. 113, n. G3, p. n/a, doi. 10.1029/2007JG000477

By:

Sullivan, Patrick F.;
Welker, Jeffrey M.;
Steltzer, Heidi;
Sletten, Ronald S.;
Hagedorn, Birgit;
Arens, Seth J. T.;
Horwath, Jennifer L.

Publication type:

Article

Nonlinear responses to nitrogen and strong interactions with nitrogen and phosphorus additions drastically alter the structure and function of a high arctic ecosystem.

Published in:

Journal of Geophysical Research. Biogeosciences, 2008, v. 113, n. G3, p. n/a, doi. 10.1029/2007JG000508

By:

Arens, Seth J. T.;
Sullivan, Patrick F.;
Welker, Jeffrey M.

Publication type:

Article

Synoptic and Mesoscale Mechanisms Drive Winter Precipitation δ18O/δ2H in South‐Central Alaska.

Published in:

Journal of Geophysical Research. Atmospheres, 2019, v. 124, n. 7, p. 4252, doi. 10.1029/2018JD030050

By:

Bailey, Hannah L.;
Klein, Eric S.;
Welker, Jeffrey M.

Publication type:

Article

Isotopic signature of extreme precipitation events in the western U.S. and associated phases of Arctic and tropical climate modes.

Published in:

Journal of Geophysical Research. Atmospheres, 2016, v. 121, n. 15, p. 8913, doi. 10.1002/2016JD025524

By:

McCabe-Glynn, Staryl;
Johnson, Kathleen R.;
Strong, Courtenay;
Zou, Yuhao;
Yu, Jin-Yi;
Sellars, Scott;
Welker, Jeffrey M.

Publication type:

Article

Atmospheric circulation is reflected in precipitation isotope gradients over the conterminous United States.

Published in:

Journal of Geophysical Research. Atmospheres, 2010, v. 115, n. D22, p. n/a, doi. 10.1029/2010JD014175

By:

Liu, Zhongfang;
Bowen, Gabriel J.;
Welker, Jeffrey M.

Publication type:

Article

Geographical Area and Life History Traits Influence Diet in an Arctic Marine Predator.

Published in:

PLoS ONE, 2016, v. 11, n. 5, p. 1, doi. 10.1371/journal.pone.0155980

By:

Tartu, Sabrina;
Bourgeon, Sophie;
Aars, Jon;
Andersen, Magnus;
Ehrich, Dorothee;
Thiemann, Gregory W.;
Welker, Jeffrey M.;
Routti, Heli

Publication type:

Article

Spatial distribution and seasonal variation in 18O/16O of modern precipitation and river water across the conterminous USA.

Published in:

Hydrological Processes, 2005, v. 19, n. 20, p. 4121, doi. 10.1002/hyp.5876

By:

Andrea Dutton;
Bruce H. Wilkinson;
Jeffrey M. Welker;
Gabriel J. Bowen;
Kyger C. Lohmann

Publication type:

Article

Automatic flower detection and phenology monitoring using time‐lapse cameras and deep learning.

Published in:

Remote Sensing in Ecology & Conservation, 2022, v. 8, n. 6, p. 765, doi. 10.1002/rse2.275

By:

Mann, Hjalte M. R.;
Iosifidis, Alexandros;
Jepsen, Jane U.;
Welker, Jeffrey M.;
Loonen, Maarten J. J. E.;
Høye, Toke T.;
Rowcliffe, Marcus;
Liu, Xuehua

Publication type:

Article

Winter Biological Processes Could Help Convert Arctic Tundra to Shrubland.

Published in:

BioScience, 2005, v. 55, n. 1, p. 17, doi. 10.1641/0006-3568(2005)055[0017:WBPCHC]2.0.CO;2

By:

Sturm, Matthew;
Schimel, Josh;
Michaelson, Gary;
Romanovsky, Vladimir E.;
Welker, Jeffrey M.;
Oberbauer, Steven F.;
Liston, Glen E.;
Fahnestock, Jace

Publication type:

Article

Relationships between daytime carbon dioxide uptake and absorbed photosynthetically active radiation for three different mountain/plains ecosystems.

Published in:

Journal of Geophysical Research. Atmospheres, 2002, v. 107, n. D14, p. ACH 19-1, doi. 10.1029/2001JD001181

By:

Kelly, Robert D.;
Hunt, E. Raymond;
Reiners, William A.;
Smith, William K.;
Welker, Jeffrey M.

Publication type:

Article

STABLE ISOTOPE-DETERMINED DIETS OF BLACK OYSTERCATCHERS HAEMATOPUS BACHMANI IN THE NORTHERN GULF OF ALASKA.

Published in:

Marine Ornithology, 2023, v. 51, n. 1, p. 125

By:

CARNEY, BROOKE;
TESSLER, DAVID;
COLETTI, HEATHER;
WELKER, JEFFREY M.;
CAUSEY, DOUGLAS

Publication type:

Article

Isotopic signatures of snow, sea ice, and surface seawater in the central Arctic Ocean during the MOSAiC expedition.

Published in:

Elementa: Science of the Anthropocene, 2024, v. 12, n. 1, p. 1, doi. 10.1525/elementa.2023.00078

By:

Mellat, Moein;
Brunello, Camilla F.;
Werner, Martin;
Bauch, Dorothea;
Damm, Ellen;
Angelopoulos, Michael;
Daiki Nomura;
Welker, Jeffrey M.;
Schneebeli, Martin;
Granskog, Mats A.;
Hoerhold, Maria;
Macfarlane, Amy R.;
Arndt, Stefanie;
Meyer, Hanno

Publication type:

Article

Complexity of Arctic Ocean water isotope (δ18O, δ²H) spatial and temporal patterns revealed with machine learning.

Published in:

Elementa: Science of the Anthropocene, 2024, v. 12, n. 1, p. 1, doi. 10.1525/elementa.2022.00127

By:

Klein, Eric S.;
Baltensperger, Andrew P.;
Welker, Jeffrey M.

Publication type:

Article

Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability.

Published in:

New Phytologist, 2009, v. 183, n. 4, p. 980, doi. 10.1111/j.1469-8137.2009.02917.x

By:

Craine, Joseph M.;
Elmore, Andrew J.;
Aidar, Marcos P. M.;
Bustamante, Mercedes;
Dawson, Todd E.;
Hobbie, Erik A.;
Kahmen, Ansgar;
Mack, Michelle C.;
McLauchlan, Kendra K.;
Michelsen, Anders;
Nardoto, Gabriela B.;
Pardo, Linda H.;
Peñuelas, Josep;
Reich, Peter B.;
Schuur, Edward A. G.;
Stock, William D.;
Templer, Pamela H.;
Virginia, Ross A.;
Welker, Jeffrey M.;
Wright, Ian J.

Publication type:

Article