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

[321336] Muller Karger海洋中有几个区域的条件似乎最适合浮游植物生长。然而，尽管主要养分水平持续较高，叶绿素浓度仍然很低。对这种情况最古老的解释之一与缺铁有关。随着“清洁”技术的发展和使用，在几次独立调查中进行的瓶子实验中获得了支持“铁”假说的证据。然而，由于各种不利的瓶子容器效应，许多人质疑这些实验的有效性。因此，很明显，验证铁假设的下一步应涉及进行非封闭中尺度（10 100平方公里）铁施肥试验。然而，将缺失的基本元素添加到前进的方式中尚不清楚。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”的最佳方法。最初的实验将在加拉帕戈斯群岛南部高营养、低叶绿素的地区进行。该贴片将使用惰性示踪剂六氟化硫进行追踪。叶绿素和营养物质以及其他变量将被监测，以确定添加铁的影响。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。这个区域很有趣，因为它似乎代表了一个自然富集实验。这一跨部门转移为NASA p3b飞越提供实时遥感测量的费用提供了NSF的份额，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.