The Integrated Precipitation and Hydrology Experiment - Hydrologic Applications for the Southeast US (IPHEx-H4SE). Part II: Atmospheric Forcing and Topographic Corrections
Abstract
In order to prepare atmospheric forcing data sets to drive the hydrologic models at
high spatial resolution, it is necessary to apply appropriate downscale methods and
bias correction schemes to the coarse reanalysis products. In this manuscript, first
we describe the methodology to derive a high-resolution (1×1 km2, hourly) atmospheric
forcing data set from 3-hr NARR (North American Regional Reanalysis) products originally
at 32×32km resolution, and second we illustrate the value and utility of the downscaled
products to drive hydrologic models offline through analysis of a long-term (5-year)
continuous simulation of water and energy budgets in the Southern Appalachians against
flux tower observations. The IPHEx-H4SE atmospheric forcing data set includes elevation
corrected air temperature and lapse rate, specific humidity, 46 friction velocity,
surface layer winds, incoming longwave radiation, and topographically and cloudiness
corrected incoming shortwave radiation that enable simulating water and energy fluxes
from diurnal to annual time-scales, and for extreme events. Although the 5-year simulation
presented here was conducted with a randomly selected rainfall product among those
recommended in the companion report ( EPL-2013-H4SE-3) without re-initialization or
data assimilation, and therefore does not represent an optimal simulation with the
hydrological model but rather a baseline control simulation that integrates and propagates
the uncertainty in all forcing data sets, the results clearly illustrate the benefit
of using the bias corrected NARR atmospheric forcing fields made available here.
Type
ReportSubject
IPHEXHydrologic Applications
SEUS
Atmospheric Forcing
Specific humidity
Air temperature
Air pressure
Wind velocity
Incoming longwave radiation at surface
Incoming shortwave radiation at surface
Permalink
https://hdl.handle.net/10161/8290Published Version (Please cite this version)
10.7924/G8RN35S6Collections
More Info
Show full item record
Articles written by Duke faculty are made available through the campus open access policy. For more information see: Duke Open Access Policy
Rights for Collection: Scholarly Articles
Works are deposited here by their authors, and represent their research and opinions, not that of Duke University. Some materials and descriptions may include offensive content. More info