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Sea-ice thickness variability and change
in the Southern Ocean The National Ice Center's weekly ice
charts are evaluated against in situ
sea ice thickness observations from ASPeCt. In general, the NIC
ice chart thickness estimates show promise relative to ship based
observations in this analysis of 5 selected periods from 1995-2000 in
the Ross Sea. Figure shows a weekly ice chart and the coincident
ASPeCt observations.
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Interannual and
Seasonal Variability of Modelled Soil Moisture in Oklahoma Temporal variability of soil moisture expressed as a percentage of field capacity for Oklahoma is shown in the Figure. On average, the soil moisture conditions during the 30 year period from 1962-1991 are about 70% of field capacity in winter and spring and decrease below 30% during summer. The seasonal cycle is pronounced, although periods of wetter (e.g., 1972-1975) and drier conditions (e.g., 1962-1967) are evident. An empirical estimate of the temporal consistency in soil moisture over Oklahoma is 53 days and the amount of variance explained by the soil moisture (red noise) signal is 86%. |
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Using GIS to Compare
Point versus Areal Estimated Precipitation and Their Implications on
Modeling Runoff The
use of rain gage-calibrated, radar-estimated precipitation relative to
the exclusive use of rain gage data to capture the temporal and spatial
variability of precipitation is investigated. The Figure shows the
Inland Bays watershed shaded in blue and the rain gage
location. Results show when precipitation is uniformly
distributed across the watershed, the rain gage observations will give
realistic results. However, with more convective type of weather
systems, the rain gage will either over-estimate or under-estimate the
precipitation falling across the Inland Bays and these precipitation
biases will propagate through any surface runoff/nutrient flux
model.
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