Aircraft (P3) and Airborne Oceanographic Lidar (AOL) Support of Interagency Iron-enrichment Experiment

9321336 Muller Karger海洋中有几个区域的条件似乎是浮游植物生长的最佳条件。 然而，尽管主要营养素水平一直很高，但叶绿素浓度仍然很低。 对这种情况最古老的解释之一是缺铁。随着“清洁”技术的发展和使用，支持“铁”假设的证据已经在几个独立的调查中进行的瓶实验中获得。 然而，许多人质疑这些实验的有效性，因为各种不利的瓶子遏制效果。 因此，它已经变得很明显，在测试铁的假设的下一步应该涉及未封闭的中尺度（10 - 100平方公里）铁施肥实验的性能。然而，在如何开展工作的问题上增加一个缺失的基本要素，目前还不清楚。通过OCE 9297518和OCE 9024373，与ONR合作，将进行这样的实验。将确定使用的铁的类型以及将其施用到75平方公里“补丁”的最佳方式。 初步实验将在加拉帕戈斯群岛以南的高营养、低叶绿素地区进行。 将使用惰性示踪剂六氟化硫来跟踪该补丁。叶绿素和营养素以及其他变量将被监测，以确定添加的铁的影响。 结合这项研究，将对加拉帕戈斯群岛以西的高叶绿素、低营养水进行研究。这一区域令人感兴趣，因为它似乎代表了一个自然富集实验。这一跨部门的转让提供了NSF的NASA P 3B飞越提供真实的时间遥感测量的成本份额，这是该实验成功所必需的。

9321336 Muller Karger There are several areas in the ocean where conditions appear to be optimal for phytoplankton growth. However, chlorophyll concentrations remain low in spite of persistently high major nutrient levels. One of the oldest explanations for this condition concerns iron deficiency. With the development and use of "clean" techniques, evidence supporting the "iron" hypothesis has been obtained in bottle experiments performed in several independent investigations. Nevertheless, many question the validity of these experiments because of various adverse bottle containment effects. Thus it has become apparent that the next step in testing the iron hypothesis should involve the performance of unenclosed mesoscale (10 100 km2) iron fertilization experiments. However adding a missing essential element to a way to proceed is unclear. Through OCE 9297518 and OCE 9024373, in collaboration with ONR, such an experiments will be undertaken. The type of iron to be used will be determined as well as the best way to administer it to a 75 km2 "patch". Initial experiments will be performed in the high nutrient, low chlorophyll region south of the Galapagos Islands. The patch will be tracked using the inert tracer sulphur hexaflouride. Chlorophyll and nutrients as well as other variables will be monitored to determine the effects of the added iron. In conjunction with this research a study will be made of the high chlorophyll, low nutr ient water west of the Galapagos Islands. This area is of interest since it appears to represent a natural enrichment experiment. This interagency transfer provides NSF's share of the costs for NASA P 3B overflights to provide real time remotely sensed measurements, necessary for the success for this experiments.