Synthesis of Existing High Resolution LTER/Icecolors Databases to Advance Physical Bio-Optical Modeling of Antarctic Primary Production

9618383 Hofmann和Prezelin虽然南大洋的初级生产对全球海洋碳通量具有重要意义，但对南极水域生产的大规模估计极不确定，而且对其在一系列时间和空间尺度上的变化幅度的了解也很少。因此，需要高分辨率数据库来开发区域和季节性初级生产模式。这项研究将把现有的两个高分辨率物理、光学和初级生产数据集的组成部分混合在一个嵌套生物光学和物理生物模型的总模型中，目的是预测南极沿海水域初级生产的模式和控制。广泛的LTER/Icecolors初级产品和物理动态数据库涵盖了在沿海水域的时间序列站进行的4年南极研究，以及在帕尔默半岛以西大陆架/斜坡水域的中尺度网格内确定的地点进行的几次过程巡航。这将允许测试关于南极沿海水域初级生产的物理强迫的预测假设，并将推进生物光学模型，将光谱光场、不断变化的紫外线气候学、浮游植物群落动态和在广泛的时间和空间尺度上的光合活动联系起来。总体目标是：a)利用1990-1994年不同季节收集的LTER中尺度数据库，开发和测试南极沿海水域基于par初级生产的生物光学模型。b)混合LTER物理场Hofmann和初级生产数据集Prezelin，定义和量化混合层动态对帕尔默半岛西部陆架/斜坡水域初级生产和浮游植物群落动态的影响。c)利用LTER初级生产数据，检验全球初级生产生物光学建模的一般假设对南大洋大规模初级生产建模的适用性。d)利用测量的紫外线气候学数据（布斯，美国国家科学基金会紫外线监测计划，帕尔默站）和模拟臭氧依赖的紫外线气候学（Madronich博士的紫外线代码，3.2版），预测太阳紫外线辐射对原位LTER初级生产的影响。尽管GLOBEC/USJGOFS项目将主要关注南大洋的海洋水域，但对现有数据库的迅速综合将为其他多学科项目的规划和执行提供有用的物理-生物光学模型的见解和进展。此外，这些项目完成后，将为方案之间的比较和整合提供重要的依据。由于岩心测量与JGOFS中使用的测量方法相同，因此可以对方案进行交叉比较，并且确定南大洋不同区域初级生产的短期变异性和长期趋势之间的差异的目标是相同的。

9618383 Hofmann and Prezelin While primary production of the Southern Ocean is significant to global ocean carbon flux, large scale estimates of production for Antarctic waters are extremely uncertain and knowledge of the magnitude of its variability over a range of time and space scales is sparse. Thus, there is a need for high resolution databases for the development of regional and seasonal primary production models. This research will blend components of two existing high-resolution physical, optical and primary production datasets in a total model of nested bio-optical and physical biological models with the aim of predicting patterns and control of primary production in Antarctic coastal waters. The extensive LTER/Icecolors primary production and physical dynamics database covers 4 years of Antarctic research at time-series stations in coastal waters and during several process cruises at defined sites within a mesoscale grid of the shelf/slope waters west of the Palmer Peninsula. This will allow testing of predictive hypotheses regarding physical forcing of primary production in Antarctic coastal waters and will advance bio-optical models linking spectral light fields, changing UV climatology, phytoplankton community dynamics and photosynthetic activity over a wide range of time and space scales. General objectives are to: a) Develop and test bio-optical models of PAR-based primary production for Antarctic coastal waters, utilizing the LTER mesoscale data bases collected for different seasons between 1990-1994. b) Blend the LTER Physical Field Hofmann and Primary Production datasets Prezelin to define and quantify the effect of mixed-layer dynamics on primary production and phytoplankton community dynamics in the shelf/slope waters west of the Palmer Peninsula. c) Utilize LTER primary production data to test the applicability of a general hypothesis of bio-optical modeling of global primary production to modeling large scale primary prod uction in the Southern Ocean. d) Hindcast the impact of solar UV radiation on in situ LTER primary production, utilizing measured UV climatology data (Booth, NSF UV Monitoring Program, Palmer Station) and modeled ozone-dependent UV climatology (Dr. Madronich's UV CODE, version 3.2, NCAR) in combination with in situ biological weighting functions (BWFs) and UV dose-response curves derived from studies of diverse phytoplankton communities acquired during Icecolors `90 r `93 Although GLOBEC/USJGOFS programs will largely focus on oceanic waters of the Southern Ocean, a prompt synthesis of the existing databases will provide insights and advances in physical-bio-optical models useful to the planning and execution of the other multidisciplinary programs. Furthermore, important bases will be provided for comparison and integration between programs as those projects are completed. Cross-comparison of programs is possible since core measurements are the same as those used in JGOFS, and the goals of ascertaining the differences between short-term variability and long-term trends in primary production in diverse regions of the Southern Ocean are shared.