Search Results - "Oechel, Walter C"

Cold season emissions dominate the Arctic tundra methane budget by Zona, Donatella, Gioli, Beniamino, Commane, Róisín, Lindaas, Jakob, Wofsy, Steven C., Miller, Charles E., Dinardo, Steven J., Dengel, Sigrid, Sweeney, Colm, Karion, Anna, Chang, Rachel Y.-W., Henderson, John M., Murphy, Patrick C., Goodrich, Jordan P., Moreaux, Virginie, Liljedahl, Anna, Watts, Jennifer D., Kimball, John S., Lipson, David A., Oechel, Walter C.

“…Arctic terrestrial ecosystems are major global sources of methane (CH₄); hence, it is important to understand the seasonal and climatic controls on CH₄…”
Get full text

CO2 exchange and evapotranspiration across dryland ecosystems of southwestern North America by Biederman, Joel A., Scott, Russell L., Bell, Tom W., Bowling, David R., Dore, Sabina, Garatuza‐Payan, Jaime, Kolb, Thomas E., Krishnan, Praveena, Krofcheck, Dan J., Litvak, Marcy E., Maurer, Gregory E., Meyers, Tilden P., Oechel, Walter C., Papuga, Shirley A., Ponce‐Campos, Guillermo E., Rodriguez, Julio C., Smith, William K., Vargas, Rodrigo, Watts, Christopher J., Yepez, Enrico A., Goulden, Michael L.

“…Global‐scale studies suggest that dryland ecosystems dominate an increasing trend in the magnitude and interannual variability of the land CO2 sink. However,…”
Get full text

Carbon uptake in Eurasian boreal forests dominates the high‐latitude net ecosystem carbon budget by Watts, Jennifer D., Farina, Mary, Kimball, John S., Schiferl, Luke D., Liu, Zhihua, Arndt, Kyle A., Zona, Donatella, Ballantyne, Ashley, Euskirchen, Eugénie S., Parmentier, Frans‐Jan W., Helbig, Manuel, Sonnentag, Oliver, Tagesson, Torbern, Rinne, Janne, Ikawa, Hiroki, Ueyama, Masahito, Kobayashi, Hideki, Sachs, Torsten, Nadeau, Daniel F., Kochendorfer, John, Jackowicz‐Korczynski, Marcin, Virkkala, Anna, Aurela, Mika, Commane, Roisin, Byrne, Brendan, Birch, Leah, Johnson, Matthew S., Madani, Nima, Rogers, Brendan, Du, Jinyang, Endsley, Arthur, Savage, Kathleen, Poulter, Ben, Zhang, Zhen, Bruhwiler, Lori M., Miller, Charles E., Goetz, Scott, Oechel, Walter C.

“…Arctic‐boreal landscapes are experiencing profound warming, along with changes in ecosystem moisture status and disturbance from fire. This region is of global…”
Get full text

Growing season and spatial variations of carbon fluxes of Arctic and boreal ecosystems in Alaska (USA) by Ueyama, Masahito, Iwata, Hiroki, Harazono, Yoshinobu, Euskirchen, Eugénie S, Oechel, Walter C, Zona, Donatella

“…To better understand the spatial and temporal dynamics of CO 2 exchange between Arctic ecosystems and the atmosphere, we synthesized CO 2 flux data, measured…”
Get full text

Arctic greening associated with lengthening growing seasons in Northern Alaska by Arndt, Kyle A, Santos, Maria J, Ustin, Susan, Davidson, Scott J, Stow, Doug, Oechel, Walter C, Tran, Thao T P, Graybill, Brian, Zona, Donatella

“…Many studies have reported that the Arctic is greening; however, we lack an understanding of the detailed patterns and processes that are leading to this…”
Get full text

Vegetation Type Dominates the Spatial Variability in CH₄ Emissions Across Multiple Arctic Tundra Landscapes by Davidson, Scott J., Sloan, Victoria L., Phoenix, Gareth K., Wagner, Robert, Fisher, James P., Oechel, Walter C., Zona, Donatella

“…Methane (CH₄) emissions from Arctic tundra are an important feedback to global climate. Currently, modelling and predicting CH₄ fluxes at broader scales are…”
Get full text

Variability in exchange of CO₂ across 12 northern peatland and tundra sites by LUND, MAGNUS, LAFLEUR, PETER M, ROULET, NIGEL T, LINDROTH, ANDERS, CHRISTENSEN, TORBEN R, AURELA, MIKA, CHOJNICKI, BOGDAN H, FLANAGAN, LAWRENCE B, HUMPHREYS, ELYN R, LAURILA, TUOMAS, OECHEL, WALTER C, OLEJNIK, JANUSZ, RINNE, JANNE, SCHUBERT, PER, NILSSON, MATS B

“…Many wetland ecosystems such as peatlands and wet tundra hold large amounts of organic carbon (C) in their soils, and are thus important in the terrestrial C…”
Get full text

Seasonality buffers carbon budget variability across heterogeneous landscapes in Alaskan Arctic tundra by Hashemi, Josh, Zona, Donatella, Arndt, Kyle A, Kalhori, Aram, Oechel, Walter C

“…Arctic tundra exhibits large landscape heterogeneity in microtopography, hydrology, and active layer depth. While many carbon flux measurements and experiments…”
Get full text

Using imaging spectroscopy to detect variation in terrestrial ecosystem productivity across a water-stressed landscape by DuBois, Sean, Desai, Ankur R., Singh, Aditya, Serbin, Shawn P., Goulden, Michael L., Baldocchi, Dennis D., Ma, Siyan, Oechel, Walter C., Wharton, Sonia, Kruger, Eric L., Townsend, Philip A.

“…A central challenge to understanding how climate anomalies, such as drought and heat-waves, impact the terrestrial carbon cycle, is quantification and scaling…”
Get full text

Tundra water budget and implications of precipitation underestimation by Liljedahl, Anna K., Hinzman, Larry D., Kane, Douglas L., Oechel, Walter C., Tweedie, Craig E., Zona, Donatella

“…Difficulties in obtaining accurate precipitation measurements have limited meaningful hydrologic assessment for over a century due to performance challenges of…”
Get full text

Latitudinal gradient of spruce forest understory and tundra phenology in Alaska as observed from satellite and ground-based data by Kobayashi, Hideki, Yunus, Ali P., Nagai, Shin, Sugiura, Konosuke, Kim, Yongwon, Van Dam, Brie, Nagano, Hirohiko, Zona, Donatella, Harazono, Yoshinobu, Bret-Harte, M. Syndonia, Ichii, Kazuhito, Ikawa, Hiroki, Iwata, Hiroki, Oechel, Walter C., Ueyama, Masahito, Suzuki, Rikie

“…The latitudinal gradient of the start of the growing season (SOS) and the end of the growing season (EOS) were quantified in Alaska (61°N to 71°N) using…”
Get full text

Characterizing permafrost active layer dynamics and sensitivity to landscape spatial heterogeneity in Alaska by Yi, Yonghong, Kimball, John S, Chen, Richard H, Moghaddam, Mahta, Reichle, Rolf H, Mishra, Umakant, Zona, Donatella, Oechel, Walter C

“…An important feature of the Arctic is large spatial heterogeneity in active layer conditions, which is generally poorly represented by global models and can…”
Get full text

On the use of MODIS EVI to assess gross primary productivity of North American ecosystems by Sims, Daniel A., Rahman, Abdullah F., Cordova, Vicente D., El‐Masri, Bassil Z., Baldocchi, Dennis D., Flanagan, Lawrence B., Goldstein, Allen H., Hollinger, David Y., Misson, Laurent, Monson, Russell K., Oechel, Walter C., Schmid, Hans P., Wofsy, Steven C., Xu, Liukang

“…Carbon flux models based on light use efficiency (LUE), such as the MOD17 algorithm, have proved difficult to parameterize because of uncertainties in the LUE…”
Get full text

Elevated atmospheric CO₂ stimulates soil fungal diversity through increased fine root production in a semiarid shrubland ecosystem by Lipson, David A, Kuske, Cheryl R, Gallegos‐Graves, La Verne, Oechel, Walter C

“…Soil fungal communities are likely to be central in mediating microbial feedbacks to climate change through their effects on soil carbon (C) storage, nutrient…”
Get full text

Mapping Arctic Tundra Vegetation Communities Using Field Spectroscopy and Multispectral Satellite Data in North Alaska, USA by Davidson, Scott J, Santos, Maria J, Sloan, Victoria L, Watts, Jennifer D, Phoenix, Gareth K, Oechel, Walter C, Zona, Donatella

“…The Arctic is currently undergoing intense changes in climate; vegetation composition and productivity are expected to respond to such changes. To understand…”
Get full text

Annual patterns and budget of CO2 flux in an Arctic tussock tundra ecosystem by Oechel, Walter C., Laskowski, Cheryl A., Burba, George, Gioli, Beniamino, Kalhori, Aram A. M.

“…The functioning of Arctic ecosystems is not only critically affected by climate change, but it also has the potential for major positive feedback on climate…”
Get full text

Satellite-based model detection of recent climate-driven changes in northern high-latitude vegetation productivity by Zhang, Ke, Kimball, John S., Hogg, E. H., Zhao, Maosheng, Oechel, Walter C., Cassano, John J., Running, Steven W.

“…We applied a satellite remote sensing based production efficiency model (PEM) using an integrated AVHRR and MODIS FPAR/LAI time series with a regionally…”
Get full text

Upscaling CH4 Fluxes Using High-Resolution Imagery in Arctic Tundra Ecosystems by Davidson, Scott, Santos, Maria, Sloan, Victoria, Reuss-Schmidt, Kassandra, Phoenix, Gareth, Oechel, Walter, Zona, Donatella

“…Arctic tundra ecosystems are a major source of methane (CH4), the variability of which is affected by local environmental and climatic factors, such as water…”
Get full text

Sensitivity of Methane Emissions to Later Soil Freezing in Arctic Tundra Ecosystems by Arndt, Kyle A., Oechel, Walter C., Goodrich, Jordan P., Bailey, Barbara A., Kalhori, Aram, Hashemi, Josh, Sweeney, Colm, Zona, Donatella

“…The atmospheric methane (CH4) concentration, a potent greenhouse gas, is on the rise once again, making it critical to understand the controls on CH4…”
Get full text

Increased CO2 loss from vegetated drained lake tundra ecosystems due to flooding by Zona, Donatella, Lipson, David A., Paw U, Kyaw T., Oberbauer, Steve F., Olivas, Paulo, Gioli, Beniamino, Oechel, Walter C.

“…Tundra ecosystems are especially sensitive to climate change, which is particularly rapid in high northern latitudes resulting in significant alterations in…”
Get full text