Study of trace gas species including greenhouse gases over the Indian Ocean during INDOEX precampaign cruises of 1996, 1997 and 1998 on Sagar Kanya

Measurements of surface concentration of trace gas species including greenh ouse gases, viz, CO, CH4, CO2, N2O have been carried out over the Indian Oc ean region on board the research vessel Sagar Kanya (SK) from 4 January to 7 February 1996, 27 December 1996 to 31 January 1997 and 18 January to 31 M arch 1998, respectively. The positive latitudinal gradient from south to no rth has been observed for various measured trace species during the above p re-campaigns. It could be attributed to the continental air-mass flow acros s the Inter-Tropical Convergence zone (ITCZ).