- Email: [email protected]
A method for the determination of phytoplankton chlorophyll and phaeophytin by fluorescence
Oceanographic Abstracts .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
507 .
.
.
.
.
.
.
.
.
.
in the trade-wind clouds. Much of the data reveal an inverse relation of deuterium and drop size. Alternative ways of explaining these data are briefly explored in terms of differences in the heights of the cloud tops, in the deuterium within them, and in the time required for drops to equilibrate as they fall through the clouds. It is concluded that the deuterium data given here are not useful as indicators of the processes of raindrop growth in Hawaiian orographic clouds. However, a study of these data, and of the relevant weather conditions obtaining when the raindrops were sampled, has led to specific suggestions for the altering of drop-sampling procedures so as to make future measurements useful in testing certain models of raindrop growth. WYLt.ZE P. J., 1963. The nature of the Mohorovicic Discontinuity, a compromise. J. Geophys.
Res., 68 (15): 4611-4619.
The available experimental data and steady-state calculations make it difficult to explain the M discontinuity beneath both oceans and continents on the basis of the same phase change. The oceanic M discontinuity may be a chemical discontinuity between basalt and peridotite, and a similar chemical discontinuity may thus be expected beneath the continents. Since available experimental data place the basalt-eclogite phase change at about the same depth as the continental M discontinuity, intersections may exist between a zone of chemical discontinuity and a phase transition zone, the transition being either basalt--eclogite or feldspathic peridotite-garnet peridotite. Detection of the latter transition by seismic techniques may be difficult. The M discontinuity could therefore represent the basalt--eclogite phase change in some localities (e.g. mountain belts) and the chemical discontinuity in others (e.g. oceans and continental shields). Variations in the depth to the chemical discontinuity and in the positions of geoisotherms produce great flexibility in orogenetic models. Intersections between the two zones at depth could be reflected at the surface by major fault zones separating large structural blocks o f different elevations. YE~rrscH C. S. and D. W. MENZEL, 1963. A method for the determination of phytoplankton chlorophyll and phaeophytin by fluorescence. Deep-Sea Res., 10 (3): 221-231. The concentration of chlorophyll, principally chlorophyll a, and after acidification phaeophytin, is measured in 85 per cent acetone extracts using a sensitive fluorometer. The method is very sensitive in that 10 fluorescence units are equal to 0-001 O • D " 6to ¢m The maximum variation is 15 per cent• 65m~. The method is highly suitable for routine analysis at sea or in the laboratory.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
507 .
.
.
.
.
.
.
.
.
.
in the trade-wind clouds. Much of the data reveal an inverse relation of deuterium and drop size. Alternative ways of explaining these data are briefly explored in terms of differences in the heights of the cloud tops, in the deuterium within them, and in the time required for drops to equilibrate as they fall through the clouds. It is concluded that the deuterium data given here are not useful as indicators of the processes of raindrop growth in Hawaiian orographic clouds. However, a study of these data, and of the relevant weather conditions obtaining when the raindrops were sampled, has led to specific suggestions for the altering of drop-sampling procedures so as to make future measurements useful in testing certain models of raindrop growth. WYLt.ZE P. J., 1963. The nature of the Mohorovicic Discontinuity, a compromise. J. Geophys.
Res., 68 (15): 4611-4619.
The available experimental data and steady-state calculations make it difficult to explain the M discontinuity beneath both oceans and continents on the basis of the same phase change. The oceanic M discontinuity may be a chemical discontinuity between basalt and peridotite, and a similar chemical discontinuity may thus be expected beneath the continents. Since available experimental data place the basalt-eclogite phase change at about the same depth as the continental M discontinuity, intersections may exist between a zone of chemical discontinuity and a phase transition zone, the transition being either basalt--eclogite or feldspathic peridotite-garnet peridotite. Detection of the latter transition by seismic techniques may be difficult. The M discontinuity could therefore represent the basalt--eclogite phase change in some localities (e.g. mountain belts) and the chemical discontinuity in others (e.g. oceans and continental shields). Variations in the depth to the chemical discontinuity and in the positions of geoisotherms produce great flexibility in orogenetic models. Intersections between the two zones at depth could be reflected at the surface by major fault zones separating large structural blocks o f different elevations. YE~rrscH C. S. and D. W. MENZEL, 1963. A method for the determination of phytoplankton chlorophyll and phaeophytin by fluorescence. Deep-Sea Res., 10 (3): 221-231. The concentration of chlorophyll, principally chlorophyll a, and after acidification phaeophytin, is measured in 85 per cent acetone extracts using a sensitive fluorometer. The method is very sensitive in that 10 fluorescence units are equal to 0-001 O • D " 6to ¢m The maximum variation is 15 per cent• 65m~. The method is highly suitable for routine analysis at sea or in the laboratory.