PEM-Tropics-B (Mar 6 - Apr 18, 1999)

PEM-Tropics-B home page

Maps of flight tracks (DC-8 and P-3)

Data Files

• Original Data Sets from GTE Archive

• Merged data files by Harvard in the GTE Archive

• Merged data files by L. Emmons, NCAR/ACD:

I have created merged data files for a number of time bases (similar to those made by M. Schultz for PEM-Tropics-A --and using much of his IDL merge software).   The data have been averaged to 10 sec, 30 sec, 60 sec, 300 sec intervals as well as to the sampling times of the UCI NMHC measurements (mggc_*), UNH HNO3 measurements (mgatg*), NASA Ames PAN measuremengs (mggc1*) and URI peroxide measurements (mgper*).  I can easily run the merges for additional time bases, or include additional sampled parameters. Let me know if you want something that is not available here. All merged files are in the GTE Data Archive format.

Special Notes:

• Higher frequency data are averaged to the timebase; Lower frequency data are repeated over the period of the measurement.
• Data flagged as below detection limit in the original files are replaced with half the detection limit value in the merges.
Merges have been created for each flight for each aircraft.  The files for all the flights for each type of merge have been "tarred and zipped". In Unix, use gunzip *.gz and then tar -xvf *.tar to uncompress.
DC8
• 10 sec
• 30 sec
• 60 sec
• HNO3
• PAN
• Peroxides
• HCs
P3
• 10 sec
• 30 sec
• 60 sec
• HNO3
• Peroxides
• HCs

• 5x5 gridded data (includes DC8 and P3 data)
• Regional profile data (includes DC8 and P3 data)

Plots

• Maps of PEM-Tropics-B observations
• Profiles
•  DC8-Hawaii
•  DC8 Christmas-Island
•  DC8 Tahiti
•  DC8 Easter-Island
•  DC8 Fiji
•  P3 Hawaii
•  P3 Christmas-Island
•  P3 Tahiti

Measurements included in the ``composites'':

DC-8

Species	Technique	Uncertainty	Principal Investigator
O3	Chemiluminescence	3%	G. Gregory/NASA Langley
O3 and aerosol profiles	DIAL	10%	E. Browell/NASA Langley
CO	DACOM	1%	G. Sachse/NASA Langley
NO, NO2	TP-LIF	18%	S. Sandholm/GIT
PAN	GC/ECD	20%	H. Singh/NASA Ames
HNO3	Mist Chamber/IC	35%	R. Talbot/UNH
NMHCs	Grab sample/GC	5% (alkanes)	D. Blake, F.S. Rowland/UC Irvine
H2O2, CH3OOH	Grab sample/HPLC	30%	B. Heikes/URI

 
 

P-3

O3	NO-Chemiluminescence		B.A. Ridley/NCAR
CO	DACOM	1%	G. Sachse, J. Collins/NASA Langley
NO, NO2	O3-Chemiluminescence		B.A. Ridley/NCAR
NMHCs	Grab sample/GC	5% (alkanes)	D. Blake, F.S. Rowland/UC Irvine
H2O2, CH3OOH	Grab sample/HPLC	30%	D. O'Sullivan/URI
HNO3	Mist Chamber/IC		R. Talbot/UNH

References

Overview

JGR in preparation
 

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