منابع مشابه
Warming and earlier spring increase western U.S. forest wildfire activity.
Western United States forest wildfire activity is widely thought to have increased in recent decades, yet neither the extent of recent changes nor the degree to which climate may be driving regional changes in wildfire has been systematically documented. Much of the public and scientific discussion of changes in western United States wildfire has focused instead on the effects of 19th- and 20th...
متن کاملEarlier vegetation green-up has reduced spring dust storms
The observed decline of spring dust storms in Northeast Asia since the 1950s has been attributed to surface wind stilling. However, spring vegetation growth could also restrain dust storms through accumulating aboveground biomass and increasing surface roughness. To investigate the impacts of vegetation spring growth on dust storms, we examine the relationships between recorded spring dust stor...
متن کاملVehicle sprung mass estimation for rough terrain
This paper provides methods and experimental results for recursively estimating the sprung mass of a vehicle driving on rough terrain. It presents a base-excitation model of vertical ride dynamics which treats the unsprung vertical accelerations, instead of the terrain profile, as the ride dynamics model input. It employs recently developed methods based on polynomial chaos theory and on the ma...
متن کاملArctic lakes show strong decadal trend in earlier spring ice-out
The timing of the seasonal freeze-thaw cycle of arctic lakes affects ecological processes and land-atmosphere energy fluxes. We carried out detailed ice-phenology mapping of arctic lakes, based on daily surface-reflectance time series for 2000-2013 from MODIS at 250 m spatial resolution. We used over 13,300 lakes, area >1 km2, in five study areas distributed evenly across the circumpolar Arctic...
متن کاملEarlier-Season Vegetation Has Greater Temperature Sensitivity of Spring Phenology in Northern Hemisphere
In recent decades, satellite-derived start of vegetation growing season (SOS) has advanced in many northern temperate and boreal regions. Both the magnitude of temperature increase and the sensitivity of the greenness phenology to temperature-the phenological change per unit temperature-can contribute the advancement. To determine the temperature-sensitivity, we examined the satellite-derived S...
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ژورنال
عنوان ژورنال: Eos, Transactions American Geophysical Union
سال: 1997
ISSN: 0096-3941
DOI: 10.1029/97eo00117