A model framework for parameterized subgrid-scale surface fluxes (PASS) has been modified and applied as PASS1 to use satellite data, models, and limited surface observations to infer root-zone available moisture (RAM) content with high spatial resolution over large terrestrial areas. Data collected during the 1997 Cooperative Atmosphere–Surface …
Journal: Journal Of Hydrometeorology, Volume 1 (5): 447-461 (2000), ISBN . DOI: 10.1175/1525-7541(2000)001<0447:EWEWPP>2.0.CO;2 Sites: US-Wlr
Assessing the long-term exchange of trace gases and energy between terrestrial ecosystems and the atmosphere is an important priority of the current climate change research. In this regard, it is particularly significant to provide valid data on simultaneous fluxes of carbon, …
Journal: Environmental Pollution, Volume 107 (1): 1-20 (2000), ISBN . DOI: 10.1016/s0269-7491(99)00156-6 Sites: US-GBT, US-GLE
Biome differences in surface energy balance strongly affect climate. However, arctic vegetation is considered sufficiently uniform that only a single arctic land surface type is generally used in climate models. Field measurements in northern Alaska show large differences among arctic ecosystem types in summer energy absorption and …
Journal: Journal Of Climate, Volume 13 (12): 2002-2010 (2000), ISBN . DOI: 10.1175/1520-0442(2000)013<2002:SDAAEI>2.0.CO;2 Sites: US-Upa
Abandonment and reforestation of agricultural lands has been a major influence on the landscape of eastern North America. Cultivation and soil amendments can dramatically alter soil nutrient pools and cycling, …
Journal: Ecology, Volume 81 (8): 2314-2330 (2000), ISBN . DOI: 10.1890/0012-9658(2000)081[2314:LTIOAO]2.0.CO;2 Sites: US-Ha2
Canopy and leaf level 2-methyl-3-butene-2-ol (methylbutenol, MBO) emissions were measured from a ponderosa pine plantation in the Sierra Nevada mountains from July to October 1998. Canopy scale fluxes were measured using a gradient approach, leaf level fluxes used a flow-through …
Journal: Atmospheric Environment, Volume 34 (21): 3535-3544 (2000), ISBN . DOI: 10.1016/s1352-2310(00)00120-5 Sites: US-Blo
We used gas exchange techniques to estimate maximum rate of carboxylation (Vcmax), a measure of photosynthetic capacity, in the understory and upper crown of a closed deciduous forest over two seasons. There was extensive variability in photosynthetic capacity as a result of vertical canopy position, species type, …
Journal: Tree Physiology, Volume 20 (9): 565-578 (2000), ISBN . DOI: 10.1093/treephys/20.9.565 Sites: US-WBW
Changes in leaf physiology with tree age and size could alter forest growth, water yield, and carbon fluxes. We measured tree water flux (Q) for 14 ponderosa pine trees in two size classes (12 m tall and ∼40 years old, …
Journal: Oecologia, Volume 124 (4): 553-560 (2000), ISBN . DOI: 10.1007/s004420000403 Sites: US-Me4
This paper summarizes and analyses available data on the surface energy balance of Arctic tundra and boreal forest. The complex interactions between ecosystems and their surface energy balance are also examined, including climatically induced shifts in ecosystem type that might amplify or reduce the effects of potential climatic …
Journal: Global Change Biology, Volume 6 (S1): 84-115 (2000), ISBN . DOI: 10.1046/j.1365-2486.2000.06015.x Sites: US-Upa
The long-term effects of elevated (ambient plus 350 μmol mol−1) atmospheric CO2 concentration (Ca) on the leaf senescence of Quercus …
Journal: Global Change Biology, Volume 6 (7): 727-733 (2000), ISBN . DOI: 10.1046/j.1365-2486.2000.00347.x Sites: US-KS2
Journal: Ecological Applications, Volume 10 (1): 60-72 (2000), ISBN . DOI: 10.2307/2640986 Sites: US-Upa