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Browsing Duke Faculty Articles by Duke-affiliated Author

Browsing Duke Faculty Articles by Duke-affiliated Author "Katul, Gabriel G."

Now showing items 1-10 of 10

Analysis of soil carbon transit times and age distributions using network theories

Manzoni, Stefano; Katul, Gaby; Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2009)

The long-term soil carbon dynamics may be approximated by networks of linear compartments, permitting theoretical analysis of transit time (i.e., the total time spent by a molecule in the system) and age (the time elapsed ...
Causality across rainfall time scales revealed by continuous wavelet transforms

Molini, Annalisa; Katul, Gaby; Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2010)

Rainfall variability occurs over a wide range of time scales owing to processes initiated by cloud microphysics and sustained by atmospheric circulation. A central topic in rainfall research is to determine whether rainfall ...
Energy, water, and carbon fluxes in a loblolly pine stand: Results from uniform and gappy canopy models with comparisons to eddy flux data

Katul, Gaby; Oren, Ram; Stoy, Paul C. (AMER GEOPHYSICAL UNION, 2009)

This study investigates the impacts of canopy structure specification on modeling net radiation (R-n), latent heat flux (LE) and net photosynthesis (A(n)) by coupling two contrasting radiation transfer models with a two-leaf ...
Estimation of In-Canopy Ammonia Sources and Sinks in a Fertilized Zea mays Field

Katul, Gaby (AMER CHEMICAL SOC, 2010)

An analytical model was developed to describe in-canopy vertical distribution of ammonia (NH3) sources and sinks and vertical fluxes in a fertilized agricultural setting using measured in-canopy mean NH3 concentration and ...
Estimation of long-term basin scale evapotranspiration from streamflow time series

Palmroth, Sari; Katul, Gaby; Oren, Ram (AMER GEOPHYSICAL UNION, 2010)

We estimated long-term annual evapotranspiration (ETQ) at the watershed scale by combining continuous daily streamflow (Q) records, a simplified watershed water balance, and a nonlinear reservoir model. Our analysis used ...
Predicting the dry deposition of aerosol-sized particles using layer-resolved canopy and pipe flow analogy models: Role of turbophoresis

Katul, Gaby (AMER GEOPHYSICAL UNION, 2010)

A number of synthesis activities, mathematical modeling, and experiments on dry deposition of aerosol-sized particles over forested surfaces point to three disjointed findings: (1) deposition velocities measured over tall ...
The rainfall-no rainfall transition in a coupled land-convective atmosphere system

Konings, Alexandra G.; Katul, Gaby (AMER GEOPHYSICAL UNION, 2010)

A one-dimensional representation of the atmospheric boundary layer (ABL) depth is coupled to a soil moisture bucket model to dynamically explore the relative roles of surface and free atmospheric conditions on convective ...
Role of microtopography in rainfall-runoff partitioning: An analysis using idealized geometry

Thompson, Sal; Katul, Gaby (AMER GEOPHYSICAL UNION, 2010)

Microtopography, consisting of small-scale excursions in the elevation of the land surface on millimeter to centimeter scales, is ubiquitous on hillslopes, but its effects are rarely incorporated into hydrological analyses ...
Scale-wise evolution of rainfall probability density functions fingerprints the rainfall generation mechanism

Molini, Annalisa; Katul, Gaby; Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2010)

The cross-scale probabilistic structure of rainfall intensity records collected over time scales ranging from hours to decades at sites dominated by both convective and frontal systems is investigated. Across these sites, ...
Vegetation-infiltration relationships across climatic and soil type gradients

Thompson, Sal; Heine, Paul; Katul, Gaby (AMER GEOPHYSICAL UNION, 2010)

The enhancement of infiltration capacity in the presence of vegetation is well documented in arid ecosystems where it can significantly impact the water balance and vegetation spatial organization. To begin progress toward ...