Title: Declining annual streamflow distributions in the Pacific Northwest United States, 1948-2006
Authors: C. H. Luce: US Forest Service, Boise, Idaho, USA; Z. A. Holden: US Forest Service, Missoula, Montana, USA.
Source: Geophysical Research Letters (GRL) paper 10.1029/2009GL039407, 2009; http://dx.doi.org/10.1029/2009GL039407
2. Explaining the rainfall-humidity relationship
It is not surprising that rainfall and humidity in the tropics are related, and observations have confirmed this connection, but details of the mechanisms underlying the relationship are not fully understood. To gain a physically motivated explanation for the relationship, Muller et al. create a simple two-layer model of the atmosphere that assumes that precipitation occurs when the amount of water vapor in the lower level exceeds a threshold value; this criterion is based on a stability argument. The amount of rainfall then depends on the total water vapor in both layers. The authors find that the model qualitatively reproduces the observed relationship between precipitation and water vapor, explains the precipitation-humidity relationship over a broad range of water vapor values, and may help explain the temperature dependence of the relation
|Contact: Peter Weiss|
American Geophysical Union