SOME ASPECTS OF HYDROGEN-SULFIDE SPATIAL VARIABILITY NEAR THE NORTH-CAUCASUS COAST OF THE BLACK-SEA

Some features of hydrogen sulfide spatial distribution in the North-Ea stern Black Sea were considered. Some questions concerning H2S analyti cal procedures were discussed: it is recommended to use in the upper p art of the anoxic column (H2S < 30 mu M) spectrophotometric method, be low - iodometric method. Based on the linearity of hydrogen sulfide an d ammonium vertical distribution up to 500(600) m its vertical gradien ts were estimaded: 0.49 +/- 0.04 mu M/m and 0.19 +/- 0.06 mu M/m respe ctively. Relation between H2S upper boundary and isopycnal surface sig ma(t) -16.19 +/- 0.05 was pointed. Main attention was directed to inte rrelation between hydrogen sulfide spatial distribution and hydrophysi cal structures of the region, especially in the nearshore zone. Dynami c situation was shown to have the preferential effect on hydrogen sulf ide spatial distribution. Based on isopycnal analysis of H2S field the existence of the nearshore convergence zone was confirmed; vertical c irculation features in the area of a rim current and anticyclonic gyre s were pointed (hydrogen sulfide as a ''tracer'' of hydrophisical mixi ng processes).