Search Results - "Oechel, WC"

Diurnal, seasonal and annual variation in the net ecosystem CO₂ exchange of a desert shrub community (Sarcocaulescent) in Baja California, Mexico by Hastings, S.J, Oechel, W.C, Muhlia-Melo, A

“…Estimates of net ecosystem exchange (NEE) of CO2 have been measured on a variety of ecosystems world wide including grasslands, savannahs, boreal, pine,…”
Get full text

Microbial activity in soils frozen to below-39 degrees C by Panikov, NS, Flanagan, PW, Oechel, WC, Mastepanov, Mikhail, Christensen, Torben

“…Recent research on life in extreme environments has shown that some microorganisms metabolize at extremely low temperatures in Arctic and Antarctic ice and…”
Get full text

Observational evidence of recent change in the northern high-latitude environment by SERREZE, M. C, WALSH, J. E, CHAPIN, F. S, OSTERKAMP, T, DYURGEROV, M, ROMANOVSKY, V, OECHEL, W. C, MORISON, J, ZHANG, T, BARRY, R. G

“…Serreze et al present an overview of accounts from different disciplines that document recent change in the northern high-latitude environment. These accounts…”
Get full text

Effects of Elevated Atmospheric CO₂ on Soil Microbial Biomass, Activity, and Diversity in a Chaparral Ecosystem by Lipson, David A, Wilson, Richard F, Oechel, Walter C

“…This study reports the effects of long-term elevated atmospheric CO₂ on root production and microbial activity, biomass, and diversity in a chaparral ecosystem…”
Get full text

Site-level evaluation of satellite-based global terrestrial gross primary production and net primary production monitoring by Turner, D.P, Ritts, W.D, Cohen, W.B, Maeirsperger, T.K, Gower, S.T, Kirschbaum, A.A, Running, S.W, Zhao, M, Wofsy, S.C, Dunn, A.L

“…Operational monitoring of global terrestrial gross primary production (GPP) and net primary production (NPP) is now underway using imagery from the…”
Get full text

Acclimation of ecosystem CO2 exchange in the Alaskan Arctic in response to decadal climate warming by OECHEL, W. C, VOURILLIS, G. L, HASTINGS, S. J, ZULOULA, R. C, WIUXMAN, L, KANE, D

“…Long-term sequestration of carbon in Alaskan Arctic tundra ecosystems was reversed by warming and drying of the climate in the early 1980s, resulting in…”
Get full text

Direct observations of the effects of aerosol loading on net ecosystem CO2 exchanges over different landscapes by Niyogi, Dev, Chang, Hsin-I, Saxena, V.K, Holt, Teddy, Alapaty, Kiran, Booker, Fitzgerald, Chen, Fei, Davis, Kenneth J, Holben, Brent, Matsui, Toshihisa, Meyers, Tilden, Oechel, Walter C, Pielke, Roger A. Sr, Wells, Randy, Wilson, Kell, Xue, Yongkang

“…We present the first direct, multisite observations in support of the hypothesis that atmospheric aerosols affect the regional terrestrial carbon cycle. The…”
Get full text

Seasonal Patterns of Reflectance Indices, Carotenoid Pigments and Photosynthesis of Evergreen Chaparral Species by C. D. Stylinski, Gamon, J. A., Oechel, W. C.

“…This study examined the ability of the Photochemical Reflectance Index (PRI) to track seasonal variations in carotenoid pigments and photosynthetic activity of…”
Get full text

Cold season CO2 emission from arctic soils by Oechel, W.C. (San Diego State University, CA.), Vourlitis, G, Hastings, S.J

“…Recent evidence indicates that significant amounts of C may be lost as CO2 to the atmosphere from tundra ecosystems during the fall, winter and spring months…”
Get full text

RESPONSES OF SOIL BIOTA TO ELEVATED CO2 IN A CHAPARRAL ECOSYSTEM by Allen, Michael F., Klironomos, John N., Treseder, Kathleen K., Oechel, Walter C.

“…Atmospheric CO2 is rapidly increasing without an integrative understanding of the responses of soil organisms. We sampled soils in a chaparral ecosystem at 18…”
Get full text

Eddy Covariance Measurements of CO2 and Energy Fluxes of an Alaskan Tussock Tundra Ecosystem by Vourlitis, George L., Oechel, Walter C.

“…Eddy covariance was used to measure the net CO2 exchange and energy balance of a moist-tussock tundra ecosystem at Happy Valley, Alaska (69 degrees 08.54′ N…”
Get full text

Recent change of Arctic tundra ecosystems from a net carbon dioxide sink to a source by Oechel, Walter C, Hastings, Steven J, Vourlrtis, George, Jenkins, Mitchell, Riechers, George, Grulke, Nancy

“…Data indicating that the tundra on the North Slope of Alaska has become a source of CO2 to the atmosphere, which coincides with the recent warming in the…”
Get full text

Landscape-scale CO2, H2O vapour and energy flux of moist-wet coastal tundra ecosystems over two growing seasons by Vourlitis, G.L, Oechel, W.C

“…Eddy covariance was used to measure landscape-scale fluxes of CO2, H2O vapour and energy in moist-wet sedge tundra ecosystems of coastal arctic Alaska. Net…”
Get full text

Alteration of Soil Carbon Pools and Communities of Mycorrhizal Fungi in Chaparral Exposed to Elevated Carbon Dioxide by Treseder, Kathleen K., Egerton-Warburton, Louise M., Allen, Michael F., Cheng, Yufu, Oechel, Walter C.

“…We examined the effects of atmospheric carbon dioxide ( CO2) enrichment on belowground carbon (C) pools and arbuscular mycorrhizal (AM) fungi in a chaparral…”
Get full text

effects of water table manipulation and elevated temperature on the net CO2 flux of wet sedge tundra ecosystems by Oechel, W.C, Vourlitis, G.L, Hastings, S.J, Ault, R.P. Jr, Bryant, P

“…In situ manipulations were conducted in a naturally drained lake on the arctic coastal plain near Prudhoe Bay, Alaska (70 °21.98′ N, 148 °33.72′ W) to assess…”
Get full text

Modelling carbon balances of coastal arctic tundra under changing climate by Grant, Robert F., Oechel, Walter C., Ping, Chien-Lu

“…Rising air temperatures are believed to be hastening heterotrophic respiration (Rh) in arctic tundra ecosystems, which could lead to substantial losses of soil…”
Get full text

A scaling approach for quantifying the net CO2 flux of the Kuparuk River Basin, Alaska by Oechel, Walter C., Vourlitis, George L., Verfaillie, Joseph, Crawford, Tim, Brooks, Steve, Dumas, Edward, Hope, Allen, Stow, Douglas, Boynton, Bill, Nosov, Viktor, Zulueta, Rommel

“…Summary Net CO2 flux measurements conducted during the summer and winter of 1994–96 were scaled in space and time to provide estimates of net CO2 exchange…”
Get full text

Energy and trace-gas fluxes across a soil pH boundary in the Arctic by Walker, D. A, Auerbach, N. A, Bockheim, J. G, Chapin, F. S, Eugster, W, King, J. Y, McFadden, J. P, Michaelson, G. J, Nelson, F. E, Oechel, W. C, Ping, C. L, Reeburg, W. S, Regli, S, Shiklomanov, N. I, Vourlitis, G. L

“…Studies and models of trace-gas flux in the Arctic consider temperature and moisture to be the dominant controls over land-atmosphere exchange,, with little…”
Get full text

Transient nature of CO2 fertilization in Arctic tundra by Oechel, W.C, Cowles, S, Grulke, N, Hastings, S.J, Lawrence, B, Prudhomme, T, Riechers, G, Strain, B, Tissue, D, Vourlitis, G

“…There has been much debate about the effect of increased atmospheric CO2 concentrations on plant net primary production and on net ecosystem CO2 flux…”
Get full text

Intercomparison among chamber, tower, and aircraft net CO2 and energy fluxes measured during the Arctic System Science Land-Atmosphere-Ice Interactions (ARCSS-LAII) Flux Study by Oechel, Walter C., Vourlitis, George L., Brooks, Steven, Crawford, Timothy L., Dumas, Edward

“…Measurements of net ecosystem CO2 exchange (NEE) and energy balance were made using chamber‐, tower‐, and aircraft‐based measurement techniques in Alaskan…”
Get full text