期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2004
卷号：XXXV Part B7
页码：861-865
出版社：Copernicus Publications
摘要：Primary productivity of the ocean is basically governed by two limiting factors; light and nutrients. In tropical waters where generally light is not a limiting factor, nutrients play an important role in causing changes in productivity of the region. Availability of nutrients is strongly influenced by turbulence of water. Wind induced turbulence is one of the causes for transport of nutrients to euphotic zone that gives rise to high productivity. Multi-date primary productivity images were generated for the period February- march, 2000-2001 in the northeastern Arabian Sea to verify this hypothesis. This is the period when winter bloom occurs in the Northern Arabian Sea (NAS). Species identification through water samples collected from the ship indicated that this bloom is dominated by noctiluca millaris of dianofleggelete class. Literature describes this bloom to be result of winter cooling and increased density of surface waters due to evaporation by prevailing northeasterly winds. An attempt was made to relate observed variability in productivity with magnitude of wind forces. Primary Productivity images were generated with OCM (Ocean Colour Monitor)/Oceansat I and wind fields using MSMR (multi frequency scanning microwave radiometer)/Oceansat I data. Northeastern Arabian Sea (Gujarat coast) was selected as the study area. A common grid of 1 0 ×1 0 was selected for the synergistic study of OCM and MSMR. Analytical model based on photosynthesis-Light relation was used to compute mixed layer primary productivity of the Arabian Sea. P-I parameters were measured for the Northeast- ern Arabian Sea from the ship. These inputs along with the OCM derived chlorophyll and diffuse attenuation coefficient were used to compute mixed layer primary production of area for middle of February to March for the years 2000 and 2001. Mixed layer primary production images were generated for the northeastern Arabian Sea and weekly MSMR winds were processed for the February and March months respectively for both the years. It was observed that primary productivity varies in concert with magnitude of wind speed. This shows that productivity in the Arabian Sea is coupled with physical forcing action. The synergistic analysis of OCM and MSMR showed that a variation in the wind speed has influence on primary productivity of the study area. This complies with the ex- pected physical-biological coupling
关键词：Remote sensing; Ocean colour; Ocean Color Monitor; Chlorophyll; Primary Productivity; wind; Winter bloom; ; Convection; Northern Arabian Sea
