Photo-Ecological Investigations of Phytoplankton of the Central Equatorial Pacific Ocean (JGOFS)

美国JGOFS项目的一个主要目标是量化赤道太平洋在全球生物地球化学通量中的作用。在这个广阔的海洋环境中，富含硝酸盐的水的准静止上涌刺激了初级生产力，并可能导致局部浮游植物生物量的积累。调节浮游植物生产的大气和物理强迫是复杂多变的，导致固定碳率和浮游植物存量的时空变化很大。浮游植物过程的准确分辨率需要在适当的时间和空间尺度上采样，以及对水动力的理解。为了实现这一目标，P.I.建议(1)在两次调查巡航（秋季和春季）和1992年春季时间序列巡航期间提供藻类色素（叶绿素，类胡萝卜素，藻胆素和褐皮色素）的核心测量；(2)对浮游植物进行光生态调查。分析分析将采用QA/QC程序，以确保高度准确和精确，以及“可比”数据。光生态研究将纳入核心色素数据，以(A)推断浮游植物生物量和组成的季节性、空间和深度依赖性变化；(B)估算浮游植物垂直混合的速率；(C)船载和系泊平台的生物光学模型与深度相关的初级采收率。

A major goal of the U.S. JGOFS program is to quantify the role of the equatorial Pacific in global biogeochemical fluxes. Quasi- stationary upwelling of nitrate-rich water within this extensive oceanic regime stimulates primary productivity and can lead to localized phytoplankton biomass accumulations. The atmospheric and physical forcings which regulate phytoplankton production are complex and variable and lead to large spatio-temporal variations in carbon fixation rates and phytoplankton standing stocks. Accurate resolution of phytoplankton processes will require sampling on appropriate time and space scales as well as an understanding of hydrodynamical forces. Toward this objective the P.I. propose to (1) provide core measurements of algal pigments (chlorophylls, carotenoids, phycobilins and phaeopigments) during the two survey cruises (fall and spring) and the 1992 spring time-series cruise; and (2) conduct photo- ecological investigations of phytoplankton. Analytical analyses will employ QA/QC procedures to insure highly accurate and precise, as well as 'comparable' data. Photo-ecological studies will incorporate core pigment data to (A) infer seasonal, spatial and depth-dependent variations in phytoplankton biomass and composition; (B) estimate rates of vertical mixing of phytoplankton; and (C) bio-optically model depth-dependent rates of primary production from shipboard and moored platforms.