Move the position of colorbar/ colorkeys in levelplot

I have plotted a stack of raster using the function 'levelplot' script as below:

library(raster)
library(rasterVis)
ras <- list.files("/filepath/", pattern = "\\.tif$", full=TRUE)
s <- stack(ras)
> levelplot(s, colorkey = list(space ="bottom",height=1, width=1),
names.attr=c("2011","2012","2013", "2014")))

Figure of Levelplot

The problem with the plot is that the label of x-axis label 'Longitude' overlaps with the colorbar/ colorkeys of the plot. Is it possible to move the position of colorkeys a little below the label 'Longitude'?

Thanks

You can adjust this with the vjust parameter in the xlab list ...

levelplot(s, colorkey = list(space = "bottom", height = 1, width = 1),
            names.attr = c("2011", "2012", "2013", "2014"),
            xlab = list(label = "Longitude", vjust = -.2)))

Before (with dummy data):

After: