FIGURE CAPTIONS

Fig. 1
The track of ORV Sagar Kanya, the Pre-INDOEX cruise made in January 5 to February 4, 1996. The Julian day numbers are marked along the ship track for each day at 12 hr. GMT.


Fig. 2
Time series of the slope 'v' of the Junge power low curve fitted to the daily mean of the measured aerosol size distribution derived from the quartz crystal cascade impactor in the size range 0.1 to 10 µm radius.


Fig. 3
24-hour streamline and isotach ending on 7 January 1996 at 12 UTC (a) 1000 mb (b) AVHRR brightness temperature (c) 850 mb (d) 200 mb. Units for wind speed:ms-1. Shaded area indicates wind speed according to the scale shown below each figure.


Fig. 4
24-hour streamline and isotach ending on February 2, 1996 at 12 UTC (a) 1000 mb (b) AVHRR brightness temperature (c) 850 mb (d) 200 mb. Units for wind speed:ms-1. Shaded area indicates wind speed according to the scale shown below each figure.


Fig. 5
Monthly mean rainfall for the Pre-INDOEX cruise made in January 5 to February 4, 1996. Units: mm/day. Rainfall amounts over shaded area are according to the scale shown below each figure.


Fig. 6
Daily mean aerosol concentrations during the cruise of ORV Sagar Kanya. Concentrations are plotted at the mid-point of the cruise track during which the sample was collected. Units are µg/m3. From top to bottom: a) nitrate; b) nss- sulfate; c) ammonium; d) mineral dust.


Fig. 7
Time series of the concentration of sulfur species in daily aerosol samples: nss SO4, methanesulfonate (MSA), and MSA-sulfate (the concentration of sulfate that might have been derived from oceanic dimethylsulfide, calculated on the basis of the concentration of MSA - see text for details).


Fig. 8
Scatter plots of aerosol species concentrations. a) NO3- versus nss SO4= , in units of microequivalents m3; b) NH4+ versus the sum of nss SO4= and NO3-, in microequivalents m3; c) nss SO4= versus mineral dust. Lines indicate the general trend of relationships of the plotted variables; slopes are marked.


Fig. 9
Time series aerosol mass concentration for SO4=, NH4+, NO3-, and aerosol optical depth during the cruise of ORV Sagar Kanya..


Fig. 10(a,b,c)
7 days back-trajectories starting from January 12, 1996, January 15, 1996, January 19, 1996, January 22, 1996 and February 2, 1996. (a) 990 mb; (b) 900 mb; and (c) 850 mb.


Fig. 10(c,d)
7-day trajectories from 990, 975, 950, 925, 900, 875 and 800 for (c) January 21, 1996 and (d) January 31, 1996.


Fig. 11
Time series of daily average global 400-700 nm solar flux as measured aboard ORV Sagar Kanya.


Fig. 12
24-hour streamline and isotach at 1000 mb (a) ending on 12 January 1996 at 12 UTC (b) ending on 15 January 1996 at 12 UTC.


Fig. 13
Aerosol number size distribution calculated from impactor mass distributions assuming a uniform aerosol density of 2 gm/cc. The size distributions in each panel reflect changes associated with a transition from a low concentration day to a high concentration day: (a) 12 to 15 January, (b) 18 to 22 January and (c) 25 Janaury to 2 February.


Fig. 14
24-hour streamline and isotach at 1000 mb (a) ending on 18 January 1996 at 12 UTC (b) ending on 22 January 1996 at 12 UTC.


Fig. 15
24-hour streamline and isotach at 1000 mb ending on 25 January 1996 at 12 UTC


Fig. 16
Time series of surface layer mineral dust and nss-sulfate.









*Address of the corresponding authors:

T.N. Krishanamurti
Department of Meterology
Florida State University
Tallahassee, FL 32360
USA
tnk@io.met.fsu.edu
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