Data collected along the BLPB trajectories showed a very well marked, height-dependent diurnal cycle of the PBL wind, with different characteristics (e.
BLPB trajectories commenced at moderate speeds, typically increasing during the first 150-200 km.
Figure 12 shows the horizontal and vertical density of BLPB observations versus all the other nonsatellite (in situ and radar) data in the BLPB domain.
With this taken into consideration, BLPB is thought to be a reliable platform, bearing in mind that it is simply a drifting balloon
The BLPB field campaigns in the Mediterranean would not have been possible without the motivation of local people who hosted the launch sites during HyMeX and ChArMEx as well as the willingness of air traffic control agents.
Slightly differing versions of BLPBs exist, but the main features have remained the same for all of the 2012/13 field campaigns (Fig.
Figure 2 is based on the System's Ecology approach and illustrates the main nitrogen flows described as under the influence of human activities in BLPB.
According to relative cultivated areas of croplands by state (FNP, 2006) and making a superposition of cropland maps with the BLPB map (Figure 1), it was possible to estimate the productive area for the crops in the basin.
We assumed that BLPB is an exporter river basin with the purpose of calculating BLPB's nitrogen outputs.
Therefore, considering our estimate of cultivated area with soybean in BLPB (about 10.
The remaining crops cultivated in BLPB (sugarcane, corn, wheat, cotton, oranges, coffee and silviculture) are not related to significant BNF rates (unless cultivated using root inoculation techniques) and most of their nitrogen demand comes from external nitrogen input obtained during application of chemical fertiliser.
According to Embrapa Informatica Agropecuaria, the main land-use in BLPB is pasture: about 40% (55 million ha, in 2002) were dedicated to cattle livestock breeding.