Hey, another IHOP report from Norman, OK - thought I'd send this out
the whole group since I was playing around with airborne CO2 data -
something I think we'd like to do more of over ChEAS sites.
I've attached a four-page postscript plot
that shows the CO2 mixing ratio,
H2O mixing ratio, NDVI and surface temperature gradients measured by the
University of Wyoming King Air along a 60 km roughly east-west track in
southern Kansas, southwest of Wichita on 27 May (cool, high cirrus,
cumuols development later in afternoon, rain later in day). We flew
alternating legs of 200 feet above the ground and .7 zi - which was
shallow (around 800 m), with soundings every third leg, a total of 7 sets
of legs. The west end is agricultural, winter wheat, the east end is
hilly shrub/grassland with bedrock showing through and not much
agriculture, more trees. The plots are averages of variables along the
low legs and high legs. Some neat CO2 gradients - more uptake and
transpiration to the west, maybe?. Winds were very light (1-2 m/s from the
southeast). W was averaging around 1 m/s, haven't computed fluxes yet.
We also have surface CO2 measurements from one of Scott's stations. I
thought I saw NDVI to surface temperature relationships while on board,
but don't really see them in the averages made here.
Comment by Ken Davis:
Nice correlation between CO2 and moisture! Gives me more faith in the relative
accuracy of the King Air CO2 measurement (which is not necessarily highly
calibrated). Those gradients, over only 60 km, are pretty large.