Lake sediments in 10 Ethiopian, Kenyan, and Tanzanian rift basins suggest that there were three humid periods at 2.7 to 2.5 million years ago (Ma), 1.9 to 1.7 Ma, and 1.1 to 0.9 Ma, superimposed on the longer-term aridification of East Africa. These humid periods correlate with increased aridity in northwest and northeast Africa and with substantial global climate transitions. These episodes co...

A low-input cropping system has been developed at Yurimiaguas, Peru, to serve as a transition technology between shifting and continuous cultivation for acid soiln of the humid tropics. Principal features are slash-andburn clearing, rotation of acid-tolerant upland rice and cowpea cultivars, maximum residue return, no tillage, and no lime or fertilizer apoiications. When yields decline as a res...

Mach-Number Measurement with Laser and Pressure Probes in Humid Supersonic Flow G. C. Herring NASA Langley Research Center, M/S 493 Hampton, VA 23681-2199 Abstract Mach-number measurements using a nonintrusive optical technique, laser-induced thermal acoustics (LITA), are compared to pressure probes in humid supersonic airflow. The two techniques agree well in dry flow (-35 °C dew point), but L...

The economic activity in arid/semiarid areas of the western United States would seem to be much more influenced by weather than humid/semi humid areas since they are located marginally closer to major drought conditions at any moment in time. This paper reexamines the original “sunspot” theory of business cycles of William Stanley Jevons, the contributions of his son H. S. Jevons, and the furth...

Flash flood disaster ranks top among all the natural hazards across world due to its high frequency, severity and fatality. However, flash simulation is still challenging in small medium-sized catchments with complex orography, flashy hydrological responses poor observations. Three distributed models, i.e., TOPModel, HEC CNFF, are selected simulate floods seven humid six semi-humid China, consi...

The problem of moist conditions has always been a challenge for humid Underground Spaces. Field test and numerical simulations two plants in the space are performed, one which independent dehumidifiers. results reveal that relative humidity can be 12.94% lower, its average temperature is increased by 1.5 °C with dehumidifier added. thermal environment improved to certain extent. A definition ef...

[1] Aboveground net primary production (ANPP) is strongly correlated with annual precipitation (AP) in grassland ecosystems. However, the relationship between the interannual variation in ANPP and the variability in precipitation remains controversial. In this study, we used long-term data of biomass and precipitation from 118 sites across global grasslands to examine the relationship between v...

Previous studies demonstrated the macroscale wear behavior of soda lime silicate (SLS) glass in humid air was governed by mechanochemical reactivity sliding interfaces, which is a function relative humidity (RH). In this study, it observed that no disenible nanowear SLS surface dry conditions because contact elastic. conditions, occurred due to water-induced reactions and RH dependence above 20...

Topic 4.1 reviews the current status of the understanding on variability of tropical cyclone (TC) activity/intensity on intraseasonal to interannual time scales around the globe. Annually, approximately 80−90 TCs occur over the tropical oceans (Neumann 1993). The TC activities depend on thermodynamic parameters (e.g., sea surface temperature (SST), atmospheric stability, and mid-tropospheric mo...