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Keyword: water balance

All sonic anemometers need to correct for transducer and structural shadowing in their velocity measurements

Publications Posted on: June 08, 2016
Sonic anemometry is fundamental to all eddy-covariance studies of surface energy and ecosystem carbon and water balance. Recent studies have shown that some nonorthogonal anemometers underestimate vertical wind. Here it is hypothesized that this is due to a lack of transducer and structural shadowing correction.

Fire and drought [Chapter 7]

Publications Posted on: May 23, 2016
Historical and presettlement relationships between drought and wildfire have been well documented in much of North America, with forest fire occurrence and area burned clearly increasing in response to drought. Drought interacts with other controls (forest productivity, topography, and fire weather) to affect fire intensity and severity.

A review of the relationships between drought and forest fire in the United States

Publications Posted on: May 23, 2016
The historical and presettlement relationships between drought and wildfire are well documented in North America, with forest fire occurrence and area clearly increasing in response to drought. There is also evidence that drought interacts with other controls (forest productivity, topography, fire weather, management activities) to affect fire intensity, severity, extent, and frequency.

Echohydrological implications of drought for forests in the United States

Publications Posted on: April 08, 2016
The relationships among drought, surface water flow, and groundwater recharge are not straightforward for most forest ecosystems due to the strong role that vegetation plays in the forest water balance. Hydrologic responses to drought can be either mitigated or exacerbated by forest vegetation depending upon vegetation water use and how forest population dynamics respond to drought.

Functionally relevant climate variables for arid lands: Aclimatic water deficit approach for modelling desert shrub distributions

Publications Posted on: July 27, 2015
We have three goals. (1) To develop a suite of functionally relevant climate variables for modelling vegetation distribution on arid and semi-arid landscapes of the Great Basin, USA. (2) To compare the predictive power of vegetation distribution models based on mechanistically proximate factors (water deficit variables) and factors that are more mechanistically removed from a plant’s use of water (precipitation).

Measuring wind and turbulence above forest canopies

Projects Posted on: April 14, 2015
Sonic anemometry is fundamental to all eddy-covariance studies of surface energy and ecosystem carbon and water balance. Recent studies have shown some anemometers underestimate vertical wind.

Precipitation declines in Pacific Northwest mountains

Documents and Media Posted on: January 23, 2015
A rapidly warming climate across the Pacific Northwest is altering the volume, timing, and quality of water received from winter snowpack. Historic observations show increased dryness accompanying more widespread wildfire and forest die-off. These trends have generally been attributed to warming temperatures because measurement gauges at lower elevations throughout the region showed no significant decrease in precipitation.Document Type: Briefing Papers

Habitone analysis of quaking aspen in the Utah Book Cliffs: Effects of site water demand and conifer cover

Publications Posted on: May 02, 2013
Quaking aspen (Populus tremuloides Michx.) is the most widely distributed tree species in North America, but its presence is declining across much of the Western United States.

Hydrology and soil erosion

Publications Posted on: August 24, 2010
We review research on surface water hydrology and soil erosion at the Santa Rita Experimental Range (SRER). Almost all of the research was associated with eight small experimental watersheds established from 1974 to 1975 and operated until the present. Analysis of climatic features of the SRER supports extending research findings from the SRER to broad areas of the Southwest with similar climates.