readme.txt
files created: 10/24/01 by chg@io.harvard.edu

FAIR USE -- The data contained on this site is freely available and we encourage others to use it. Kindly keep us
informed of how you are using our data and of any publication plans. Please acknowledge the data source as a citation,
or in the acknowledgments if the data have not yet been published. If we feel that we should be offered participation as
authors, we will let you know and we assume that an agreement on such matters will be reached prior to publishing the
data. If your work directly competes with our analysis we may ask that we have the opportunity to submit a manuscript
before you submit one that uses unpublished data. In order to maintain these measurements we periodically need to
demonstrate progress to our sponsoring agencies. In addition to informing us of your plans, we kindly request that you
help us by providing preprints and updates on publication status. 

single flight in-situ data

name convention:
dyymmdd*.csv 
yy: 2 digit year
mm: 2 digit month
dd: day of month
*: a,b or c; indicating 1st, 2nd or 3rd flight of the date

Updated version dyymmdd*.csv created 04/24/02; changes to version cyymmdd*.csv from 7/17/01:
1)	ground height (GNDHGT) was interpolated from the digital elevation map (NIMA) to the exact aircraft location;
	digital elevation map was corrected to match elevation at airports in order to give true ground 
	elevation for take-off, landing and missed approaches
2)	GPS altitude (alt_gps) was slightly corrected upward using the altitude information at airports, 
	changes where between +26 m and +47 m
3)	mixed layer height (MLHASL_M) is now expressed in meters above mean sea level, determined from 
	GPS altitude (alt_gps) at which vertical profiles of theta, h2o, co2 and CO exhibit certain characteristics

Files contain data for single flights
1	GMT: UND data recording time, in seconds since midnight (GMT)
2	CO: CO data (1 hz), corrected for time lag, in ppb 
3	PALT_M: pressure altitude, in m above mean sea level
4	PMB: ambient pressure, in mbar
5	TRASP_MS: true air speed, in m/s
6	TAIR_C: air temperature, in deg C
7	TDEW: dew point, in deg C
8	THETA: potential temperature, in deg K
9	LAT: latitude, in deg
10	LON: longitude, in deg EAST
11	GSPD_MS: ground speed, in m/s
12	HEADING: heading, in deg (north = 0)
13	alt_gps: gps altitude, in m above mean sea level
14	gmt_gps: gps time
15	ALPHA:
16	O2_P1:
17	O2_P2:
18	O2_FLOW:
19	CMDL_SW:
20	H2OG_KG: h2o mixing ration, in g/kg
21	CO2: CO2, corrected for time lag, in ppm
22	vertwnd: vertical wind speed, in m/s
23	vertvel: vertical speed of aircraft, in m/s
24	UWIND: x-component of horizontal wind vector (where the wind blows to, not where it comes from)
25	VWIND: y-component of horizontal wind vector (where the wind blows to, not where it comes from)
26	GNDHGT: ground elevation (from digital elevation map), in m
27	PROFIL: counts through vertical profiles (automatically generated)
28	MLHASL_M: mixed layer height (estimated from vertical profiles of theta, h2o, co2 and CO), in m above mean sea level