Satellite-derived primary productivity and its spatial and temporal variability in the China seas
China ; Climatic change ; Interannual variability ; Model ; Ocean ; Ocean atmosphere interaction ; Pacific Ocean ; Productivity ; Remote sensing ; Surface temperature
The spatial and temporal variability of primary productivity in the China seas from 2003 to 2005 was estimated using a size-fractionated primary productivity model. Primary productivity estimated from satellite-derived data showed spatial
Precipitation and streamflow variability in northwestern Oklahoma, 1894-2003
Climatic trend ; Climatic variability ; El Niño ; Ocean atmosphere interaction ; Oklahoma ; Precipitation ; Stream flow ; Surface temperature ; Time series ; Twentieth Century ; United States of America
This paper utilizes time-series analysis to examine precipitation and streamflow variability in northwestern Oklahoma over the period 1894-2003. Trends and periodicities in the hydroclimatic variables were investigated using, respectively, Mann
-Kendall test and continuous wavelet transform (CWT) methods. The CWT analysis revealed interannual to decadal modes of variability in precipitation. Similar but less sustained cycles are also found in streamflow. Correlation of precipitation with the El
Testing the importance of the explanatory variables in a mixed geographically weighted regression model
Il s'agit d'un type de modèle de régression dans lequel quelques coefficients de variables explicatives sont constants, les autres pouvant être sujets à des variations spatiales. Les AA. soulignent un problème d'inférence : l'influence des variables
Trends in rainfall total and variability (1970-2000) along the KwaZulu-Natal Drakensberg foothills
Annual variation ; Climatic trend ; Environmental management ; Interannual variability ; KwaZulu-Natal ; Precipitation ; South Africa ; Water resources ; Water supply
South Africa's most valuable source of water is the eastern escarpment region of the KwaZulu-Natal Drakensberg and Lesotho highlands. Analysis of rainfall variability trends can thus contribute to a better understanding and management of the area
Analysis of factors determining sediment yield variability in the highlands of northern Ethiopia
In this study, reservoir sedimentation and corresponding catchment attribute data were used to investigate the major factors controlling sediment yield variability in a mountainous dryland region of northern Ethiopia. Sediment yield data were
acquired for representative 11 catchments above reservoirs. The results show that terrain form, gully erosion, surface hydrology, and land cover explain most of the variability in sediment yield among the catchments.
Spatial and temporal variability of Holocene temperature in the North Atlantic region
In order to assess spatial and temporal patterns of Holocene climate evolution across this region, the AA. collated quantitative paleotemperature records at sub-millennial resolution and synthesized their temporal variability using principal
components analysis (PCA). The analysis reveals considerable spatial variability, most notably in the time-transgressive expression of the Holocene thermal maximum (HTM). The spatially complex patterns of Holocene climate development, which are defined
Great earthquakes of variable magnitude at the Cascadia subduction zone
Comparison of histories of great earthquakes and accompanying tsunamis at 8 coastal sites suggests plate-boundary ruptures of varying length, implying great earthquakes of variable magnitude at the Cascadia subduction zone. Inference of rupture
Here, the AA. use Cs 137 to characterize and quantify soil erosion at the Konza Prairie Long-Term Ecological Research (LTER) site, an undisturbed grassland in northeastern Kansas. Their goals are to quantify the small-scale variability of Cs 137
in soils and to ascertain if basin-scale variability exceeds small-scale variability. In addition, they test whether topographical attributes such as slope, curvature, and upslope contributing area are related to Cs 137 inventories, and use
the presence of ice with a range of topographic variables obtained from a digital elevation model. The use of generalized additive models and binary regression tree models enabled : to quantify the spatial variability in the distribution of glaciers
attributable to characteristics of the local terrain; to investigate the interaction between the variables that account for the ice cover distribution; and to map the probability of glacier development.
A 2200-yr record of hydrologic variability from Foy Lake, Montana, USA, inferred from diatom and geochemical data
A 2200-yr long, high-resolution record of drought variability in northwest Montana is inferred from diatoms and δO 18 values of bio-induced carbonate preserved in a varved lacustrine core from Foy Lake. A previously developed model of the diatom
Variable weathering response in sandstone : factors controlling decay sequences
Differences in weathering response characteristics of fine- and coarse-grained Stanton Moor sandstone samples were assessed in a laboratory weathering simulation experiment using a variable combination of salt weathering and freeze/thaw cycles. Data