DYCOMS-II Aircraft:  C-130 Cloud Condensation Nuclei (CCN) Level-I
                     Data (Snider)


1.0  General Information


The C-130 Cloud Condensation Nuclei (CCN) Level-I Data is one of 
several aircraft data sets collected as part of the Dynamics and 
Chemistry of Marine Stratocumulus Phase II:  Entrainment Studies
(DYCOMS-II) project.  Included in the data set are CCN data from 
10 National Science Foundation/National Center for Atmospheric 
Research C-130 research flights (mostly at night) and one test 
flight.  The CCN data are available for the complete duration of 
all research flights where the altitude does not exceed 2000 m.
The data cover the period from 7 - 28 July.


2.0  Data Contact


Jefferson R. Snider (PI)
Phone: (307) 766-2647
E-Mail: jsnider@uwyo.edu


3.0  Data and Format Information

             
Complete information on this data set is available in pdf form
at the following location:

http://www.joss.ucar.edu/dycoms/archive/docs/snider_ccnreadme.pdf


3.1  CCN Spectra from file summary_of_c_k.txt

Above Cloud
#       start   end   "C,cm-3"   k   "CN, cm-3" "PCASP, cm-3"
1       133610  140000  321     0.37    630     115
2       121821  125005  332     0.52    523     48
3       111221  114423  203     0.67    439     198
4       105908  112540  51      0.30    128     79
5       73645   80622   78      0.69    340     31
6       100652  102441  112     0.73    277     83
7       81533   83248   93      1.28    588     70
8       243422  244206  99      1.27    377     47
9       203133  213030  433     0.87    1080    366
10      233215  234059  680     0.76    1129    369

Below Cloud
#       start   end   "C,cm-3"  k    "CN, cm-3" "PCASP, cm-3"
1       93613   103051  161     0.31    274     93
2       95742   110223  61      0.21    290     189
3       92926   100006  298     0.79    472     187
4       94853   104955  207     0.34    290     77
5       92606   102421  211     0.31    417     136
6       133827  135225  177     0.53    389     183
7       95948   110150  139     0.45    281     140
8       232516  235431  133     0.41    245     138
9       253501  261139  286     0.34    558     327
10      NA      NA

Sea Surface
#       start   end  "C, cm-3"  k   "CN, cm-3"  "PCASP, cm-3"
1       122816  133143  167     0.55    268     110
2       133008  140237  50      0.25    277     31
3       125606  140009  381     0.48    627     165
4       130448  134144  155     0.41    269     28
5       130331  134848  245     0.41    403     26
6       NA      NA
7       130531  140920  116     0.49    195     111
8       NA      NA
9       224711  231646  314     0.46    535     325
10      203528  213136  413     0.18    576     360

3.2  FORTRAN write statement for out files

write (10, fmt='(i4,2(x,f7.0),2(x,f7.3),
     &     2(x,f7.3),x,i2,x,f7.2,x,f7.0,
     &     3(x,f7.1),x,f7.2,3(x,f7.0))') 
     &     iopen,daystart,cdon_time(k),
     &     atoptmp(i),adtemp(i),peak_voltage,vdet_min,
     &     itotsec(k),ss(k),ccnconc(k),apcasp(k),
     &     ap1501(i),atrf(i),yplot1(k),acpc3acc(i),
     &     arafcn1(i),afssp3_hig(i)


4.0  Quality Control Procedures 

 
     UCAR/JOSS conducted no quality checks on these data.


5.0  File Naming Convention


The file names are structured as follows:


out_255_1_181rf01.dat

Where rf01 signifies research flight #1


6.0  References


None